Forrest, S. R. The path to ubiquitous and low-cost organic electronic appliances on plastic. Nature 428, 911–918 (2004).
Google Scholar
Hong, G. et al. A brief history of OLEDs-emitter development and industry milestones. Adv. Mater. 33, e2005630 (2021).
Google Scholar
Uoyama, H., Goushi, K., Shizu, K., Nomura, H. & Adachi, C. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature 492, 234 (2012).
Google Scholar
Wong, M. Y. & Zysman-Colman, E. Purely organic thermally activated delayed fluorescence materials for organic light-emitting diodes. Adv. Mater. 29, 1605444 (2017).
Google Scholar
Hu, Y. X. et al. Efficient selenium-integrated TADF OLEDs with reduced roll-off. Nat. Photonics 16, 803–810 (2022).
Google Scholar
Cui, L.-S. et al. Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states. Nat. Photonics 14, 636–642 (2020).
Google Scholar
Wada, Y., Nakagawa, H., Matsumoto, S., Wakisaka, Y. & Kaji, H. Organic light emitters exhibiting very fast reverse intersystem crossing. Nat. Photonics 14, 643–649 (2020).
Google Scholar
Luo, Y. et al. Ultra-fast triplet-triplet-annihilation-mediated high-lying reverse intersystem crossing triggered by participation of nπ*-featured excited states. Nat. Commun. 13, 6892 (2022).
Google Scholar
Gillett, A. J. et al. Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters. Nat. Mater. 21, 1150–1157 (2022).
Google Scholar
Aizawa, N., Harabuchi, Y., Maeda, S. & Pu, Y. J. Kinetic prediction of reverse intersystem crossing in organic donor-acceptor molecules. Nat. Commun. 11, 3909 (2020).
Google Scholar
Zysman-Colman, E. Molecular designs offer fast exciton conversion. Nat. Photonics 14, 593–594 (2020).
Google Scholar
Yu, Y., Mallick, S., Wang, M. & Börjesson, K. Barrier-free reverse-intersystem crossing in organic molecules by strong light-matter coupling. Nat. Commun. 12, 3255 (2021).
Google Scholar
Stranius, K., Hertzog, M. & Borjesson, K. Selective manipulation of electronically excited states through strong light-matter interactions. Nat. Commun. 9, 2273 (2018).
Google Scholar
Etherington, M. K., Gibson, J., Higginbotham, H. F., Penfold, T. J. & Monkman, A. P. Revealing the spin–vibronic coupling mechanism of thermally activated delayed fluorescence. Nat. Commun. 7, 13680 (2016).
Google Scholar
Schleper, A. L. et al. Hot exciplexes in U-shaped TADF molecules with emission from locally excited states. Nat. Commun. 12, 6179 (2021).
Google Scholar
Li, F. et al. Singlet and triplet to doublet energy transfer: improving organic light-emitting diodes with radicals. Nat. Commun. 13, 2744 (2022).
Google Scholar
Wu, X. et al. The role of host–guest interactions in organic emitters employing MR-TADF. Nat. Photonics 15, 780–786 (2021).
Google Scholar
Gillett, A. J. et al. Spontaneous exciton dissociation enables spin state interconversion in delayed fluorescence organic semiconductors. Nat. Commun. 12, 6640 (2021).
Google Scholar
Fan, X.-C. et al. Ultrapure green organic light-emitting diodes based on highly distorted fused π-conjugated molecular design. Nat. Photonics 17, 280–285 (2023).
Google Scholar
Zhao, W., He, Z. & Tang, B. Z. Room-temperature phosphorescence from organic aggregates. Nat. Rev. Mater. 5, 869–885 (2020).
Google Scholar
Segal, M., Baldo, M. A., Holmes, R. J., Forrest, S. R. & Soos, Z. G. Excitonic singlet-triplet ratios in molecular and polymeric organic materials. Phys. Rev. B 68, 075211 (2003).
Google Scholar
Baldo, M. A. et al. Highly efficient phosphorescent emission from organic electroluminescent devices. Nature 395, 151–154 (1998).
Google Scholar
Cai, X. & Su, S.-J. Marching toward highly efficient, pure-blue, and stable thermally activated delayed fluorescent organic light-emitting diodes. Adv. Funct. Mater. 28, 1802558 (2018).
Google Scholar
Endo, A. et al. Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes. Appl. Phys. Lett. 98, 083302 (2011).
Google Scholar
Citation Report (Web of Science, accessed 16 February, 2024); www.webofscience.com/wos/woscc/citation-report/ad524515-2457-4194-9799-2409c8bd955f-cc8165d0.
Murawski, C., Leo, K. & Gather, M. C. Efficiency roll-off in organic light-emitting diodes. Adv. Mater. 25, 6801–6827 (2013).
Google Scholar
Chiu, C.-H. et al. A phosphorescent OLED with an efficiency roll-off lower than 1% at 10 000 cd m−2 achieved by reducing the carrier mobility of the donors in an exciplex co-host system. J. Mater. Chem. C 10, 4955–4964 (2022).
Google Scholar
Giebink, N. C. & Forrest, S. R. Quantum efficiency roll-off at high brightness in fluorescent and phosphorescent organic light emitting diodes. Phys. Rev. B 77, 235215 (2008).
Google Scholar
Huang, Y., Hsiang, E. L., Deng, M. Y. & Wu, S. T. Mini-LED, Micro-LED and OLED displays: present status and future perspectives. Light: Sci. Appl. 9, 105 (2020).
Google Scholar
Ligthart, A. et al. Effect of triplet confinement on triplet-triplet annihilation in organic phosphorescent host-guest systems. Adv. Funct. Mater. 28, 1804618 (2018).
Google Scholar
Coehoorn, R., van Eersel, H., Bobbert, P. A. & Janssen, R. A. J. Kinetic Monte Carlo study of the sensitivity of OLED efficiency and lifetime to materials parameters. Adv. Funct. Mater. 25, 2024–2037 (2015).
Google Scholar
Masui, K., Nakanotani, H. & Adachi, C. Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence. Org. Electron. 14, 2721–2726 (2013).
Google Scholar
Hasan, M. et al. Probing polaron-induced exciton quenching in TADF based organic light-emitting diodes. Nat. Commun. 13, 254 (2022).
Google Scholar
Thakur, K., Zee, B., Wetzelaer, G. J. A. H., Ramanan, C. & Blom, P. W. M. Quantifying exciton annihilation effects in thermally activated delayed fluorescence materials. Adv. Opt. Mater. 10, 2101784 (2021).
Google Scholar
Scholz, S., Kondakov, D., Lussem, B. & Leo, K. Degradation mechanisms and reactions in organic light-emitting devices. Chem. Rev. 115, 8449–8503 (2015).
Google Scholar
Dias, F. B., Penfold, T. J. & Monkman, A. P. Photophysics of thermally activated delayed fluorescence molecules. Methods. Appl. Fluoresc. 5, 012001 (2017).
Google Scholar
Tsuchiya, Y. et al. Exact solution of kinetic analysis for thermally activated delayed fluorescence materials. J. Phys. Chem. A 125, 8074–8089 (2021).
Google Scholar
Matsuo, K. & Yasuda, T. Blue thermally activated delayed fluorescence emitters incorporating acridan analogues with heavy group 14 elements for high-efficiency doped and non-doped OLEDs. Chem. Sci. 10, 10687–10697 (2019).
Google Scholar
Kim, J. U. et al. Nanosecond-time-scale delayed fluorescence molecule for deep-blue OLEDs with small efficiency rolloff. Nat. Commun. 11, 1765 (2020).
Google Scholar
Wong, M. Y. et al. Deep-blue oxadiazole-containing thermally activated delayed fluorescence emitters for organic light-emitting diodes. ACS Appl. Mater. Interfaces 10, 33360–33372 (2018).
Google Scholar
Serevičius, T. et al. TADF parameters in the solid state: an easy way to draw wrong conclusions. J. Phys. Chem. A 125, 1637–1641 (2021).
Google Scholar
Niwa, A. et al. Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host. Appl. Phys. Lett. 113, 083301 (2018).
Google Scholar
Rossi, D., Palazzo, D., Di Carlo, A. & Auf der Maur, M. Drift‐diffusion study of the IQE roll‐off in blue thermally activated delayed fluorescence OLEDs. Adv. Electron. Mater. 6, 2000245 (2020).
Google Scholar
Serevičius, T. et al. Emission wavelength dependence on the rISC rate in TADF compounds with large conformational disorder. Chem. Commun. 55, 1975–1978 (2019).
Google Scholar
Kelly, D., Franca, L. G., Stavrou, K., Danos, A. & Monkman, A. P. Laplace transform fitting as a tool to uncover distributions of reverse intersystem crossing rates in TADF systems. J. Phys. Chem. Lett. 13, 6981–6986 (2022).
Google Scholar
BT.2020: Parameter Values for Ultra-High Definition Television Systems for Production and International Programme Exchange. ITN www.itu.int/rec/R-REC-BT.2020-2-201510-I/en (2015).
Nakanotani, H. et al. High-efficiency organic light-emitting diodes with fluorescent emitters. Nat. Commun. 5, 5016 (2014).
Google Scholar
Duan, C. et al. Multi-dipolar chromophores featuring phosphine oxide as joint acceptor: a new strategy toward high-efficiency blue thermally activated delayed fluorescence dyes. Chem. Mat. 28, 5667–5679 (2016).
Google Scholar
Yang, T. et al. Improving the efficiency of red thermally activated delayed fluorescence organic light‐emitting diode by rational isomer engineering. Adv. Funct. Mater. 30, 2002681 (2020).
Google Scholar
Park, I. S., Lee, J. & Yasuda, T. High-performance blue organic light-emitting diodes with 20% external electroluminescence quantum efficiency based on pyrimidine-containing thermally activated delayed fluorescence emitters. J. Mater. Chem. C 4, 7911–7916 (2016).
Google Scholar
Zhang, D., Cai, M., Zhang, Y., Zhang, D. & Duan, L. Sterically shielded blue thermally activated delayed fluorescence emitters with improved efficiency and stability. Mater. Horiz. 3, 145–151 (2016).
Google Scholar
Lee, J., Aizawa, N. & Yasuda, T. Isobenzofuranone- and chromone-based blue delayed fluorescence emitters with low efficiency roll-off in organic light-emitting diodes. Chem. Mat. 29, 8012–8020 (2017).
Google Scholar
Miwa, T. et al. Blue organic light-emitting diodes realizing external quantum efficiency over 25% using thermally activated delayed fluorescence emitters. Sci. Rep. 7, 284 (2017).
Google Scholar
Park, I. S., Komiyama, H. & Yasuda, T. Pyrimidine-based twisted donor-acceptor delayed fluorescence molecules: a new universal platform for highly efficient blue electroluminescence. Chem. Sci. 8, 953–960 (2017).
Google Scholar
Rajamalli, P. et al. New molecular design concurrently providing superior pure blue, thermally activated delayed fluorescence and optical out-coupling efficiencies. J. Am. Chem. Soc. 139, 10948–10951 (2017).
Google Scholar
Chen, J. X. et al. Red organic light-emitting diode with external quantum efficiency beyond 20% based on a novel thermally activated delayed fluorescence emitter. Adv. Sci. 5, 1800436 (2018).
Google Scholar
Furue, R. et al. Highly efficient red-orange delayed fluorescence emitters based on strong π-accepting dibenzophenazine and dibenzoquinoxaline cores: toward a rational pure-red OLED design. Adv. Opt. Mater. 6, 1701147 (2018).
Google Scholar
Zhang, D., Song, X., Cai, M., Kaji, H. & Duan, L. Versatile indolocarbazole-isomer derivatives as highly emissive emitters and ideal hosts for thermally activated delayed fluorescent OLEDs with alleviated efficiency roll-off. Adv. Mater. 30, 1705406 (2018).
Google Scholar
Ahn, D. H. et al. Highly twisted donor-acceptor boron emitter and high triplet host material for highly efficient blue thermally activated delayed fluorescent device. ACS Appl. Mater. Interfaces 11, 14909–14916 (2019).
Google Scholar
Braveenth, R. et al. High efficiency green TADF emitters of acridine donor and triazine acceptor D–A–D structures. J. Mater. Chem. C 7, 7672–7680 (2019).
Google Scholar
Chen, J. X. et al. Red/near-infrared thermally activated delayed fluorescence OLEDs with near 100% internal quantum efficiency. Angew. Chem. Int. Ed. 58, 14660–14665 (2019).
Google Scholar
Cheng, Z. et al. Achieving efficient blue delayed electrofluorescence by shielding acceptors with carbazole units. ACS Appl. Mater. Interfaces 11, 28096–28105 (2019).
Google Scholar
Xie, F. M. et al. Rational molecular design of dibenzo[a,c]phenazine-based thermally activated delayed fluorescence emitters for orange-red OLEDs with EQE up to 22.0. ACS Appl. Mater. Interfaces 11, 26144–26151 (2019).
Google Scholar
Xie, F. M. et al. Efficient orange–red delayed fluorescence organic light‐emitting diodes with external quantum efficiency over 26%. Adv. Electron. Mater. 6, 1900843 (2019).
Google Scholar
Balijapalli, U. et al. Utilization of multi-heterodonors in thermally activated delayed fluorescence molecules and their high performance bluish-green organic light-emitting diodes. ACS Appl. Mater. Interfaces 12, 9498–9506 (2020).
Google Scholar
Kumar, A. et al. Doubly boron-doped TADF emitters decorated with ortho-donor groups for highly efficient green to red OLEDs. Chem. Eur. J. 26, 16793–16801 (2020).
Google Scholar
Lim, H. et al. Highly efficient deep-blue OLEDs using a TADF emitter with a narrow emission spectrum and high horizontal emitting dipole ratio. Adv. Mater. 32, e2004083 (2020).
Google Scholar
Peng, C. C. et al. Highly efficient thermally activated delayed fluorescence via an unconjugated donor-acceptor system realizing EQE of over 30. Adv. Mater. 32, e2003885 (2020).
Google Scholar
Yoon, J. et al. Asymmetric host molecule bearing pyridine core for highly efficient blue thermally activated delayed fluorescence OLEDs. Chem. Eur. J. 26, 16383–16391 (2020).
Google Scholar
Balijapalli, U. et al. Tetrabenzo[a,c]phenazine backbone for highly efficient orange-red thermally activated delayed fluorescence with completely horizontal molecular orientation. Angew. Chem. Int. Ed. 60, 19364–19373 (2021).
Google Scholar
Chan, C.-Y. et al. Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission. Nat. Photonics 15, 203–207 (2021).
Google Scholar
Chen, J. X. et al. Managing locally excited and charge-transfer triplet states to facilitate up-conversion in red TADF emitters that are available for both vacuum- and solution-processes. Angew. Chem. Int. Ed. 60, 2478–2484 (2021).
Google Scholar
Chen, Y. et al. Approaching nearly 40% external quantum efficiency in organic light emitting diodes utilizing a green thermally activated delayed fluorescence emitter with an extended linear donor-acceptor-donor structure. Adv. Mater. 33, e2103293 (2021).
Google Scholar
Duan, C. et al. Manipulating charge‐transfer excitons by exciplex matrix: toward thermally activated delayed fluorescence diodes with power efficiency beyond 110 lm W−1. Adv. Funct. Mater. 31, 2102739 (2021).
Google Scholar
Karthik, D. et al. Acceptor-donor-acceptor-type orange-red thermally activated delayed fluorescence materials realizing external quantum efficiency over 30% with low efficiency roll-off. Adv. Mater. 33, e2007724 (2021).
Google Scholar
Kim, H., Lee, Y., Lee, H., Hong, J. I. & Lee, D. Click-to-twist strategy to build blue-to-green emitters: bulky triazoles for electronically tunable and thermally activated delayed fluorescence. ACS Appl. Mater. Interfaces 13, 12286–12295 (2021).
Google Scholar
Nagata, M. et al. Fused-nonacyclic multi-resonance delayed fluorescence emitter based on ladder-thiaborin exhibiting narrowband sky-blue emission with accelerated reverse intersystem crossing. Angew. Chem. Int. Ed. 60, 20280–20285 (2021).
Google Scholar
Tanaka, H. et al. Hypsochromic shift of multiple-resonance-induced thermally activated delayed fluorescence by oxygen atom incorporation. Angew. Chem. Int. Ed. 60, 17910–17914 (2021).
Google Scholar
Chen, J. X. et al. Optimizing intermolecular interactions and energy level alignments of red TADF emitters for high-performance organic light-emitting diodes. Small 18, e2201548 (2022).
Google Scholar
Gao, H. et al. Ultrapure blue thermally activated delayed fluorescence (TADF) emitters based on rigid sulfur/oxygen-bridged triarylboron acceptor: MR TADF and D-A TADF. J. Phys. Chem. Lett. 13, 7561–7567 (2022).
Google Scholar
Mahmoudi, M. et al. Ornamenting of blue thermally activated delayed fluorescence emitters by anchor groups for the minimization of solid-state solvation and conformation disorder corollaries in non-doped and doped organic light-emitting diodes. ACS Appl. Mater. Interfaces 14, 40158–40172 (2022).
Google Scholar
Mamada, M. et al. Highly efficient deep‐blue organic light‐emitting diodes based on rational molecular design and device engineering. Adv. Funct. Mater. 32, 2204352 (2022).
Google Scholar
Masimukku, N. et al. Bipolar 1,8-naphthalimides showing high electron mobility and red AIE-active TADF for OLED applications. Phys. Chem. Chem. Phys. 24, 5070–5082 (2022).
Google Scholar
Zhang, H. Y. et al. A novel orange-red thermally activated delayed fluorescence emitter with high molecular rigidity and planarity realizing 32.5% external quantum efficiency in organic light-emitting diodes. Mater. Horiz. 9, 2425–2432 (2022).
Google Scholar
Xia, G. et al. A TADF emitter featuring linearly arranged spiro-donor and spiro-acceptor groups: efficient nondoped and doped deep-blue OLEDs with CIE(y) <0.1. Angew. Chem. Int. Ed. 60, 9598–9603 (2021).
Google Scholar
Song, W. et al. [1,2,4]Triazolo[1,5-a]pyridine-based host materials for green phosphorescent anddelayed-fluorescence OLEDs with low efficiency roll-off. ACS Appl. Mater. Interfaces 10, 24689–24698 (2018).
Google Scholar
Li, W., Li, J., Liu, D., Wang, F. & Zhang, S. Bipolar host materials for high-efficiency blue phosphorescent and delayed-fluorescence OLEDs. J. Mater. Chem. C 3, 12529–12538 (2015).
Google Scholar
Zhang, Z. et al. Excited-state engineering of universal ambipolar hosts for highly efficient blue phosphorescence and thermally activated delayed fluorescence organic light-emitting diodes. Chem. Eng. J. 382, 122485 (2020).
Google Scholar
Ni, F. et al. Teaching an old acceptor new tricks: rationally employing 2,1,3-benzothiadiazole as input to design a highly efficient red thermally activated delayed fluorescence emitter. J. Mater. Chem. C 5, 1363–1368 (2017).
Google Scholar
Zhang, Y. L. et al. High-efficiency red organic light-emitting diodes with external quantum efficiency close to 30% based on a novel thermally activated delayed fluorescence emitter. Adv. Mater. 31, e1902368 (2019).
Google Scholar
Gong, X. et al. A red thermally activated delayed fluorescence emitter simultaneously having high photoluminescence quantum efficiency and preferentially horizontal emitting dipole orientation. Adv. Funct. Mater. 30, 1908839 (2020).
Google Scholar
Wang, Y. Y. et al. Positive impact of chromophore flexibility on the efficiency of red thermally activated delayed fluorescence materials. Mater. Horiz. 8, 1297–1303 (2021).
Google Scholar
Kim, B. S. & Lee, J. Y. Engineering of mixed host for high external quantum efficiency above 25% in green thermally activated delayed fluorescence device. Adv. Funct. Mater. 24, 3970–3977 (2014).
Google Scholar
Sun, J. W. et al. A fluorescent organic light-emitting diode with 30% external quantum efficiency. Adv. Mater. 26, 5684–5688 (2014).
Google Scholar
Seino, Y., Inomata, S., Sasabe, H., Pu, Y. J. & Kido, J. High-performance green OLEDs using thermally activated delayed fluorescence with a power efficiency of over 100 lm W−1. Adv. Mater. 28, 2638–2643 (2016).
Google Scholar
Sasabe, H. et al. Ultrahigh power efficiency thermally activated delayed fluorescent OLEDs by the strategic use of electron‐transport materials. Adv. Opt. Mater. 6, 1800376 (2018).
Google Scholar
Zhang, X. et al. Host-free yellow-green organic light-emitting diodes with external quantum efficiency over 20% based on a compound exhibiting thermally activated delayed fluorescence. ACS Appl. Mater. Interfaces 11, 12693–12698 (2019).
Google Scholar
Liu, H. et al. Modulating the acceptor structure of dicyanopyridine based TADF emitters: Nearly 30% external quantum efficiency and suppression on efficiency roll-off in OLED. Chem. Eng. J. 401, 126107 (2020).
Google Scholar
Chen, C.-H. et al. New bipolar host materials for high power efficiency green thermally activated delayed fluorescence OLEDs. Chem. Eng. J. 442, 136292 (2022).
Google Scholar
Zhang, Q. et al. Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence. Nat. Photonics 8, 326–332 (2014).
Google Scholar
Hirata, S. et al. Highly efficient blue electroluminescence based on thermally activated delayed fluorescence. Nat. Mater. 14, 330–336 (2015).
Google Scholar
Sun, J. W. et al. Thermally activated delayed fluorescence from azasiline based intramolecular charge-transfer emitter (DTPDDA) and a highly efficient blue light emitting diode. Chem. Mat. 27, 6675–6681 (2015).
Google Scholar
Komatsu, R., Sasabe, H., Seino, Y., Nakao, K. & Kido, J. Light-blue thermally activated delayed fluorescent emitters realizing a high external quantum efficiency of 25% and unprecedented low drive voltages in OLEDs. J. Mater. Chem. C 4, 2274–2278 (2016).
Google Scholar
Lee, I. & Lee, J. Y. Molecular design of deep blue fluorescent emitters with 20% external quantum efficiency and narrow emission spectrum. Org. Electron. 29, 160–164 (2016).
Google Scholar
Lee, S. Y., Adachi, C. & Yasuda, T. High-efficiency blue organic light-emitting diodes based on thermally activated delayed fluorescence from phenoxaphosphine and phenoxathiin derivatives. Adv. Mater. 28, 4626–4631 (2016).
Google Scholar
Lin, T. A. et al. Sky-blue organic light emitting diode with 37% external quantum efficiency using thermally activated delayed fluorescence from spiroacridine-triazine hybrid. Adv. Mater. 28, 6976–6983 (2016).
Google Scholar
Rajamalli, P. et al. A method for reducing the singlet-triplet energy gaps of TADF materials for improving the blue OLED efficiency. ACS Appl. Mater. Interfaces 8, 27026–27034 (2016).
Google Scholar
Sun, J. W., Kim, K. H., Moon, C. K., Lee, J. H. & Kim, J. J. Highly efficient sky-blue fluorescent organic light emitting diode based on mixed cohost system for thermally activated delayed fluorescence emitter (2CzPN). ACS Appl. Mater. Interfaces 8, 9806–9810 (2016).
Google Scholar
Rajamalli, P. et al. Thermally activated delayed fluorescence emitters with a m,m-di-tert-butyl-carbazolyl benzoylpyridine core achieving extremely high blue electroluminescence efficiencies. J. Mater. Chem. C 5, 2919–2926 (2017).
Google Scholar
Xu, Y. et al. Highly efficient blue fluorescent OLEDs based on upper level triplet-singlet intersystem crossing. Adv. Mater. 31, e1807388 (2019).
Google Scholar
Bian, J. et al. Ambipolar self-host functionalization accelerates blue multi-resonance thermally activated delayed fluorescence with internal quantum efficiency of 100. Adv. Mater. 34, e2110547 (2022).
Google Scholar
Cheon, H. J., Woo, S. J., Baek, S. H., Lee, J. H. & Kim, Y. H. Dense local triplet states and steric shielding of a multi-resonance TADF emitter enable high-performance deep-blue OLEDs. Adv. Mater. 34, e2207416 (2022).
Google Scholar
Mei, Y., Liu, D., Li, J. & Wang, J. Accelerating PLQY and RISC rates in deep-blue TADF materials with the acridin-9(10H)-one acceptor by tuning the peripheral groups on carbazole donors. J. Mater. Chem. C 10, 16524–16535 (2022).
Google Scholar
Matsushima, T. & Adachi, C. Enhanced hole injection and transport in molybdenum-dioxide-doped organic hole-transporting layers. J. Appl. Phys. 103, 034501 (2008).
Google Scholar
Kim, K.-H., Moon, C.-K., Sun, J. W., Sim, B. & Kim, J.-J. Triplet harvesting by a conventional fluorescent emitter using reverse intersystem crossing of host triplet exciplex. Adv. Opt. Mater. 3, 895–899 (2015).
Google Scholar
Zhao, B. et al. Highly efficient red OLEDs using DCJTB as the dopant and delayed fluorescent exciplex as the host. Sci. Rep. 5, 10697 (2015).
Google Scholar
Hung, W. Y. et al. Balance the carrier mobility to achieve high performance exciplex OLED using a triazine-based acceptor. ACS Appl. Mater. Interfaces 8, 4811–4818 (2016).
Google Scholar
Lo, Y. C. et al. High-efficiency red and near-infrared organic light-emitting diodes enabled by pure organic fluorescent emitters and an exciplex-forming cohost. ACS Appl. Mater. Interfaces 11, 23417–23427 (2019).
Google Scholar
Xia, G. et al. Organoboron compounds constructed through the tautomerization of 1H-indole to 3H-indole for red OLEDs. J. Mater. Chem. C 9, 6834–6840 (2021).
Google Scholar
Bang, H.-S., Yun, J. & Lee, C. Improved lifetime and efficiency of green organic light-emitting diodes with a fluorescent dye (C545T)-doped hole transport layer. In Proc. SPIE, Organic Light Emitting Materials and Devices XI (eds. Kafafi, Z. H. & So, F.) 66551W-1–66551W-7 (SPIE, 2007).
Benor, A., Takizawa, S.-y, Pérez-Bolívar, C. & Anzenbacher, P. Efficiency improvement of fluorescent OLEDs by tuning the working function of PEDOT:PSS using UV–ozone exposure. Org. Electron. 11, 938–945 (2010).
Google Scholar
Liu, X. K. et al. Nearly 100% triplet harvesting in conventional fluorescent dopant-based organic light-emitting devices through energy transfer from exciplex. Adv. Mater. 27, 2025–2030 (2015).
Google Scholar
Jang, H. J. & Lee, J. Y. Suppressed nonradiative decay of an exciplex by an inert host for efficiency improvement in a green fluorescence organic light-emitting diode. J. Phys. Chem. C 123, 26856–26861 (2019).
Google Scholar
Liang, B., Wang, J., Cheng, Z., Wei, J. & Wang, Y. Exciplex-based electroluminescence: over 21% external quantum efficiency and approaching 100 lm/W power efficiency. J. Phys. Chem. Lett. 10, 2811–2816 (2019).
Google Scholar
Zheng, C.-J. et al. Highly efficient non-doped deep-blue organic light-emitting diodes based on anthracene derivatives. J. Mater. Chem. 20, 1560–1566 (2010).
Google Scholar
Sych, G. et al. Exciplex-enhanced singlet emission efficiency of nondoped organic light emitting diodes based on derivatives of tetrafluorophenylcarbazole and tri/tetraphenylethylene exhibiting aggregation-induced emission enhancement. J. Phys. Chem. C 122, 14827–14837 (2018).
Google Scholar
Tasaki, S. et al. Realization of ultra‐high‐efficient fluorescent blue OLED. J. Soc. Inf. Disp. 30, 441–451 (2022).
Google Scholar
Zhao, J. et al. Highly efficient green and red OLEDs based on a new exciplex system with simple structures. Org. Electron. 43, 136–141 (2017).
Google Scholar
Shih, C. J. et al. Versatile exciplex-forming co-host for improving efficiency and lifetime of fluorescent and phosphorescent organic light-emitting diodes. ACS Appl. Mater. Interfaces 10, 24090–24098 (2018).
Google Scholar
Reineke, S., Walzer, K. & Leo, K. Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emitters. Phys. Rev. B 75, 125328 (2007).
Google Scholar
Fukagawa, H. et al. Highly efficient and stable red phosphorescent organic light-emitting diodes using platinum complexes. Adv. Mater. 24, 5099–5103 (2012).
Google Scholar
Kwak, J. et al. New carbazole-based host material for low-voltage and highly efficient red phosphorescent organic light-emitting diodes. J. Mater. Chem. 22, 6351–6355 (2012).
Google Scholar
Chen, C.-H. et al. Highly efficient orange and deep-red organic light emitting diodes with long operational lifetimes using carbazole–quinoline based bipolar host materials. J. Mater. Chem. C 2, 6183–6191 (2014).
Google Scholar
Lee, J. H., Shin, H., Kim, J. M., Kim, K. H. & Kim, J. J. Exciplex-forming co-host-based red phosphorescent organic light-emitting diodes with long operational stability and high efficiency. ACS Appl. Mater. Interfaces 9, 3277–3281 (2017).
Google Scholar
Jia, L. et al. High-performance exciplex-type host for multicolor phosphorescent organic light-emitting diodes with low turn-on voltages. ACS Sustain. Chem. Eng. 6, 8809–8815 (2018).
Google Scholar
Liu, X.-Y. et al. 9-Silafluorene and 9-germafluorene: novel platforms for highly efficient red phosphorescent organic light-emitting diodes. J. Mater. Chem. C 6, 8144–8151 (2018).
Google Scholar
Wang, Y. et al. High-efficiency red organic light-emitting diodes based on a double-emissive layer with an external quantum efficiency over 30%. J. Mater. Chem. C 6, 7042–7045 (2018).
Google Scholar
Ito, T. et al. A series of dibenzofuran-based n-type exciplex host partners realizing high-efficiency and stable deep-red phosphorescent OLEDs. Chem. Eur. J. 25, 7308–7314 (2019).
Google Scholar
Tian, Q. S. et al. Multichannel effect of triplet excitons for highly efficient green and red phosphorescent OLEDs. Adv. Opt. Mater. 8, 2000556 (2020).
Google Scholar
Kim, S.-Y. et al. Organic light-emitting diodes with 30% external quantum efficiency based on a horizontally oriented emitter. Adv. Funct. Mater. 23, 3896–3900 (2013).
Google Scholar
Li, G. et al. Very high efficiency orange-red light-emitting devices with low roll-off at high luminance based on an ideal host-guest system consisting of two novel phosphorescent iridium complexes with bipolar transport. Adv. Funct. Mater. 24, 7420–7426 (2014).
Google Scholar
Liu, J. et al. Achieving above 30% external quantum efficiency for inverted phosphorescence organic light-emitting diodes based on ultrathin emitting layer. Org. Electron. 15, 2492–2498 (2014).
Google Scholar
Seo, S. et al. Exciplex-triplet energy transfer: a new method to achieve extremely efficient organic light-emitting diode with external quantum efficiency over 30% and drive voltage below 3 V. Japn J. Appl. Phys. 53, 042102 (2014).
Google Scholar
Shih, C. J. et al. Exciplex-forming cohost for high efficiency and high stability phosphorescent organic light-emitting diodes. ACS Appl. Mater. Interfaces 10, 2151–2157 (2018).
Google Scholar
Tsai, M. H. et al. 3-(9-Carbazolyl)carbazoles and 3,6-di(9-carbazolyl)carbazoles as effective host materials for efficient blue organic electrophosphorescence. Adv. Mater. 19, 862–866 (2007).
Google Scholar
Su, S.-J., Takahashi, Y., Chiba, T., Takeda, T. & Kido, J. Structure-property relationship of pyridine-containing triphenyl benzene electron-transport materials for highly efficient blue phosphorescent OLEDs. Adv. Funct. Mater. 19, 1260–1267 (2009).
Google Scholar
Lee, J., Lee, J.-I., Lee, J.-W. & Chu, H. Y. Effects of charge balance on device performances in deep blue phosphorescent organic light-emitting diodes. Org. Electron. 11, 1159–1164 (2010).
Google Scholar
Jeon, S. O., Jang, S. E., Son, H. S. & Lee, J. Y. External quantum efficiency above 20% in deep blue phosphorescent organic light-emitting diodes. Adv. Mater. 23, 1436–1441 (2011).
Google Scholar
Lee, C. W. & Lee, J. Y. Above 30% external quantum efficiency in blue phosphorescent organic light-emitting diodes using pyrido[2,3-b]indole derivatives as host materials. Adv. Mater. 25, 5450–5454 (2013).
Google Scholar
Fleetham, T., Li, G., Wen, L. & Li, J. Efficient ‘pure’ blue OLEDs employing tetradentate Pt complexes with a narrow spectral bandwidth. Adv. Mater. 26, 7116–7121 (2014).
Google Scholar
Udagawa, K., Sasabe, H., Cai, C. & Kido, J. Low-driving-voltage blue phosphorescent organic light-emitting devices with external quantum efficiency of 30%. Adv. Mater. 26, 5062–5066 (2014).
Google Scholar
Lee, J.-H. et al. An exciplex forming host for highly efficient blue organic light emitting diodes with low driving voltage. Adv. Funct. Mater. 25, 361–366 (2015).
Google Scholar
Lim, H. et al. An exciplex host for deep-blue phosphorescent organic light-emitting diodes. ACS Appl. Mater. Interfaces 9, 37883–37887 (2017).
Google Scholar
Wang, Z. et al. Manipulation of thermally activated delayed fluorescence of blue exciplex emission: fully utilizing exciton energy for highly efficient organic light emitting diodes with low roll-off. ACS Appl. Mater. Interfaces 9, 21346–21354 (2017).
Google Scholar
Idris, M. et al. Blue emissive fac/mer‐iridium (III) NHC carbene complexes and their application in OLEDs. Adv. Opt. Mater. 9, 2001994 (2021).
Google Scholar
Inoue, M. et al. Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters. Chem. Phys. Lett. 644, 62–67 (2016).
Google Scholar
Yang, M., Park, I. S. & Yasuda, T. Full-color, narrowband, and high-efficiency electroluminescence from boron and carbazole embedded polycyclic heteroaromatics. J. Am. Chem. Soc. 142, 19468–19472 (2020).
Google Scholar
Oda, S. et al. Carbazole-based DABNA analogues as highly efficient thermally activated delayed fluorescence materials for narrowband organic light-emitting diodes. Angew. Chem. Int. Ed. 60, 2882–2886 (2021).
Google Scholar
Huang, T., Wang, Q., Meng, G., Duan, L. & Zhang, D. Accelerating radiative decay in blue through-space charge transfer emitters by minimizing the face-to-face donor-acceptor distances. Angew. Chem. Int. Ed. 61, e202200059 (2022).
Google Scholar
Lv, X. et al. Extending the pi-skeleton of multi-resonance TADF materials towards high-efficiency narrowband deep-blue emission. Angew. Chem. Int. Ed. 61, e202201588 (2022).
Google Scholar
Grüne, J., Bunzmann, N., Meinecke, M., Dyakonov, V. & Sperlich, A. Kinetic modeling of transient electroluminescence reveals TTA as an efficiency-limiting process in exciplex-based TADF OLEDs. J. Phys. Chem. C 124, 25667–25674 (2020).
Google Scholar
Virtanen, P. et al. SciPy 1.0: fundamental algorithms for scientific computing in Python. Nat. Methods 17, 261–272 (2020).
Google Scholar