[1] [1] Pu, Y.J., Satake, R., Koyama, Y., Otomo, T., Hayashi, R., Haruta, N., Katagiri, H., Otsuki, D., Kim, D.G., Sato, T.: Absence of delayed fluorescence and triplet-triplet annihilation in organic light emitting diodes with spatially orthogonal bianthracenes. J. Mater. Chem. C Mater. Opt. Electron. Devices 7(9), 2541–2547 (2019)

[2] [2] Cai, M., Auffray, M., Zhang, D., Zhang, Y., Nagata, R., Lin, Z., Tang, X., Chan, C.Y., Lee, Y.T., Huang, T., Song, X., Tsuchiya, Y., Adachi, C., Duan, L.: Enhancing spin-orbital coupling in deepblue/blue TADF emitters by minimizing the distance from the heteroatoms in donors to acceptors. Chem. Eng. J. 420, 127591 (2021)

[3] [3] Zhao, C., Duan, L.: Review on photo-and electrical aging mechanisms for neutral excitons and ions in organic light-emitting diodes. J. Mater. Chem. C Mater. Opt. Electron. Devices 8(3), 803–820 (2020)

[4] [4] Song, X., Zhang, D., Zhang, Y., Lu, Y., Duan, L.: Strategically modulating carriers and excitons for efficient and stable ultrapuregreen fluorescent OLEDs with a sterically hindered bodipy dopant. Adv. Opt. Mater. (2020)

[5] [5] Li, M., Wang, Y.F., Zhang, D., Duan, L., Chen, C.F.: Axially chiral TADF-active enantiomers designed for efficient blue circularly polarized electroluminescence. Angew. Chem. Int. Ed. Engl.59(9), 3500–3504 (2020)

[6] [6] Yu, L., Wu, Z., Xie, G., Zeng, W., Ma, D., Yang, C.: Molecular design to regulate the photophysical properties of multifunctional TADF emitters towards high-performance TADF-based OLEDs with EQEs up to 22.4% and small efficiency roll-offs. Chem. Sci. (Camb.) 9(5), 1385–1391 (2018)

[7] [7] Gong, X., Li, P., Huang, Y.H., Wang, C.Y., Lu, C.H., Lee, W.K., Zhong, C., Chen, Z., Ning, W., Wu, C.C., Gong, S., Yang, C.: A red thermally activated delayed fluorescence emitter simultaneously having high photoluminescence quantum efficiency and preferentially horizontal emitting dipole orientation. Adv. Funct. Mater. (2020)

[8] [8] Wang, Y.K., Huang, C.C., Ye, H., Zhong, C., Khan, A., Yang, S.Y., Fung, M.K., Jiang, Z.Q., Adachi, C., Liao, L.S.: Through space charge transfer for efficient sky-blue thermally activated delayed fluorescence (TADF) emitter with unconjugated connection. Adv. Opt. Mater. (2020)

[9] [9] Yang, C.Y., Kang, S., Jeong, H., Jang, H.J., Lee, Y., Lee, J.Y.: Key host parameters for long lifetimes in phosphorescent organic lightemitting diodes: Bond dissociation energy in triplet excited state. J. Mater. Chem. C Mater. Opt. Electron. Devices 8(5), 1697–1703 (2020)

[10] [10] Byeon, S.Y., Lee, D.R., Yook, K.S., Lee, J.Y.: Recent progress of singlet-exciton-harvesting fluorescent organic light-emitting diodes by energy transfer processes. Adv. Mater. (2019)

[11] [11] Kothavale, S., Lee, K.H., Lee, J.Y.: Isomeric quinoxalinedicarbonitrile as color-managing acceptors of thermally activated delayed fluorescent emitters. ACS Appl. Mater. Interfaces 11(19), 17583–17591 (2019)

[12] [12] Jeon, S.K., Lee, H.L., Yook, K.S., Lee, J.Y.: Recent progress of the lifetime of organic light-emitting diodes based on thermally activated delayed fluorescent material. Adv. Mater. (2019)

[13] [13] Guo, R., Zhang, W., Zhang, Q., Lv, X., Wang, L.: Efficient deep red phosphorescent oleds using 1,2,4-thiadiazole core-based novel bipolar host with low efficiency roll-off. Front Optoelectron. 11(4), 375–384 (2018)

[14] [14] Baldo, M.A., O’brien, D.F., Thompson, M.E., Forrest, S.R.: Excitonic singlet-triplet ratio in a semiconducting organic thin film. Phys. Rev. B Condens. Matter (1999)

[15] [15] Liu, Y., Li, C., Ren, Z., Yan, S., Bryce, M.R.: All-organic thermally activated delayed fluorescence materials for organic lightemitting diodes. Nat. Rev. Mater. 3(4), 18020–18039 (2018)

[16] [16] Cai, X., Su, S.J.: Marching toward highly efficient, pure-blue, and stable thermally activated delayed fluorescent organic lightemitting diodes. Adv. Funct. Mater. (2018)

[17] [17] Wu, Y., Zhu, Y., Zhang, Z., Zhao, C., He, J., Yan, C., Meng, H.: Narrowband deep-blue multi-resonance induced thermally activated delayed fluorescence: Insights from the theoretical molecular design. Molecules (2022)

[18] [18] Yang, Z., Mao, Z., Xie, Z., Zhang, Y., Liu, S., Zhao, J., Xu, J., Chi, Z., Aldred, M.: Recent advances in organic thermally activated delayed fluorescence materials. Chem. Soc. Rev. 46(3), 915–1016 (2017)

[19] [19] Wong, M.Y., Zysman-Colman, E.: Purely organic thermally activated delayed fluorescence materials for organic light-emitting diodes. Adv. Mater. 29(22), 1605444–1605497 (2017)

[20] [20] Konidena, R.K., Lee, K.H., Lee, J.Y.: Two-channel emission controlled by a conjugation valve for the color switching of thermally activated delayed fluorescence emission. J. Mater. Chem. C Mater. Opt. Electron. Devices 7(32), 9908–9916 (2019)

[21] [21] Im, Y., Han, S.H., Lee, J.Y.: Deep blue thermally activated delayed fluorescent emitters using CN-modified indolocarbazole as an acceptor and carbazole-derived donors. J. Mater. Chem. C Mater. Opt. Electron. Devices 6(18), 5012–5017 (2018)

[22] [22] 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(2), 145–151 (2016)

[23] [23] Cai, M., Zhang, D., Xu, J., Hong, X., Zhao, C., Song, X., Qiu, Y., Kaji, H., Duan, L.: Unveiling the role of langevin and trap-assisted recombination in long lifespan OLEDs employing thermally activated delayed fluorophores. ACS Appl. Mater. Interfaces 11(1), 1096–1108 (2019)

[24] [24] Song, X., Zhang, D., Lu, Y., Yin, C., Duan, L.: Understanding and manipulating the interplay of wide-energy-gap host and TADF sensitizer in high-performance fluorescence OLEDs. Adv. Mater. (2019)

[25] [25] Gan, L., Xu, Z., Wang, Z., Li, B., Li, W., Cai, X., Liu, K., Liang, Q., Su, S.J.: Utilizing a spiro TADF moiety as a functional electron donor in TADF molecular design toward efficient “multichannel” reverse intersystem crossing. Adv. Funct. Mater. (2019)

[26] [26] Wang, Y., Di, K., Duan, Y., Guo, R., Lian, L., Zhang, W., Wang, L.: The selective regulation of borylation site based on one-shot electrophilic C-H borylation reaction, achieving highly efficient narrowband organic light-emitting diodes. Chem. Eng. J. 431, 133221 (2022)

[27] [27] Zhang, D., Duan, L., Li, C., Li, Y., Li, H., Zhang, D., Qiu, Y.: Highefficiency fluorescent organic light-emitting devices using sensitizing hosts with a small singlet-triplet exchange energy. Adv. Mater. 26(29), 5050–5055 (2014)

[28] [28] Abroshan, H., Zhang, Y., Zhang, X., Fuentes-Hernandez, C., Barlow, S., Coropceanu, V., Marder, S.R., Kippelen, B., Brédas, J.L.: Thermally activated delayed fluorescence sensitization for highly efficient blue fluorescent emitters. Adv. Funct. Mater. (2020)

[29] [29] Zhang, D., Duan, L.: TADF sensitization targets deep-blue. Nat. Photonics 15(3), 169–173 (2021)

[30] [30] Zou, S.N., Chen, X., Yang, S.Y., Kumar, S., Qu, Y.K., Yu, Y.J., Fung, M.K., Jiang, Z.Q., Liao, L.S.: Efficient violet organic lightemitting diodes with CIEy of 0.02 based on spiro skeleton. Adv. Opt. Mater. (2020)

[31] [31] Geng, T.M., Zhang, C., Hu, C., Liu, M., Fei, Y.T., Xia, H.Y.: Synthesis of 1,6-disubstituted pyrene-based conjugated microporous polymers for reversible adsorption and fluorescence sensing of iodine. New J. Chem. 44(6), 2312–2320 (2020)

[32] [32] Yang, T., Liang, B., Cheng, Z., Li, C., Lu, G., Wang, Y.: Construction of efficient deep-red/near-infrared emitter based on a large π-conjugated acceptor and delayed fluorescence OLEDs with external quantum efficiency of over 20%. J. Phys. Chem. C 123(30), 18585–18592 (2019)

[33] [33] Yin, X., Peng, Y., Luo, J., Zhou, X., Gao, C., Wang, L., Yang, C.: Tailoring the framework of organic small molecule semiconductors towards high-performance thermoelectric composites via conglutinated carbon nanotube webs. J. Mater. Chem. A Mater. Energy Sustain. 6(18), 8323–8330 (2018)

[34] [34] Ahn, D.H., Jeong, J.H., Song, J., Lee, J.Y., Kwon, J.H.: Highly efficient deep blue fluorescent organic light-emitting diodes boosted by thermally activated delayed fluorescence sensitization. ACS Appl. Mater. Interfaces 10(12), 10246–10253 (2018)

[35] [35] Wang, Z., Zheng, C., Fu, W., Xu, C., Wu, J., Ji, B.: Efficient nondoped deep-blue electroluminescence devices based on unsymmetrical and highly twisted pyrene derivatives. New J. Chem. 41(23), 14152–14160 (2017)

[36] [36] Feng, X., Hu, J.Y., Yi, L., Seto, N., Tao, Z., Redshaw, C., Elsegood, M.R., Yamato, T.: Pyrene-based Y-shaped solid-state blue emitters: synthesis, characterization, and photoluminescence. Chem. Asian J. 7(12), 2854–2863 (2012)

[37] [37] Figueira-Duarte, T.M., Müllen, K.: Pyrene-based materials for organic electronics. Chem. Rev. 111(11), 7260–7314 (2011)

[38] [38] Wee, K.R., Ahn, H.C., Son, H.J., Han, W.S., Kim, J.E., Cho, D.W., Kang, S.O.: Emission color tuning and deep blue dopant materials based on 1,6-bis(N-phenyl-p-(R)-phenylamino)pyrene. J. Org. Chem. 74(21), 8472–8475 (2009)

[39] [39] Lee, S.B., Park, K.H., Joo, C.W., Lee, J.I., Lee, J., Kim, Y.H.: Highly twisted pyrene derivatives for non-doped blue oleds. Dyes Pigments 128, 19–25 (2016)

[40] [40] Zhang, Q., Xiang, S., Huang, Z., Sun, S., Ye, S., Lv, X., Liu, W., Guo, R., Wang, L.: Molecular engineering of pyrimidine-containing thermally activated delayed fluorescence emitters for highly efficient deep-blue (CIE y<0.06) organic light-emitting diodes. Dyes Pigments 155, 51–58 (2018)

[41] [41] Lv, X., Huang, R., Sun, S., Zhang, Q., Xiang, S., Ye, S., Leng, P., Dias, F.B., Wang, L.: Blue TADF emitters based on indenocarbazole derivatives with high photoluminescence and electroluminescence efficiencies. ACS Appl. Mater. Interfaces 11(11), 10758–10767 (2019)

[42] [42] Lv, X., Zhang, W., Ding, D., Han, C., Huang, Z., Xiang, S., Zhang, Q., Xu, H., Wang, L.: Integrating the emitter and host characteristics of donor-acceptor systems through edge-spiro effect toward 100% exciton harvesting in blue and white fluorescence diodes. Adv. Opt. Mater. 6(12), 1800165–1800176 (2018)

[43] [43] Zhang, Q., Sun, S., Chung, W.J., Yoon, S.J., Wang, Y., Guo, R., Ye, S., Lee, J.Y., Wang, L.: Highly efficient TADF OLEDs with low efficiency roll-off based on novel acridine-carbazole hybrid donor-substituted pyrimidine derivatives. J. Mater. Chem. C Mater. Opt. Electron. Devices 7(39), 12248–12255 (2019)

[44] [44] Ahn, D.H., Lee, H., Kim, S.W., Karthik, D., Lee, J., Jeong, H., Lee, J.Y., Kwon, J.H.: 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(16), 14909–14916 (2019)

[45] [45] Zhang, Q., Wang, Y., Yoon, S.J., Chung, W.J., Ye, S., Guo, R., Leng, P., Sun, S., Lee, J.Y., Wang, L.: Fusing acridine and benzofuran/benzothiophene as a novel hybrid donor for high-performance and low efficiency roll-off TADF oleds. J. Mater. Chem. C Mater. Opt. Electron. Devices 8(5), 1864–1870 (2020)

[46] [46] Lv, X., Sun, S., Zhang, Q., Ye, S., Liu, W., Wang, Y., Guo, R., Wang, L.: A strategy to construct multifunctional TADF materials for deep blue and high efficiency yellow fluorescent devices. J. Mater. Chem. C Mater. Opt. Electron. Devices 8(14), 4818–4826 (2020)

[47] [47] Oh, H.Y., Lee, C., Lee, S.: Efficient blue organic light-emitting diodes using newly-developed pyrene-based electron transport materials. Org. Electron. 10(1), 163–169 (2009)

[48] [48] Zhang, Q., Tsang, D., Kuwabara, H., Hatae, Y., Li, B., Takahashi, T., Lee, S.Y., Yasuda, T., Adachi, C.: Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters. Adv. Mater. 27(12), 2096–2100 (2015)