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24.4: A Linear High‐ T g Arylphosphine Oxide‐Triazine Conjugate as a Doped Electron‐Transport Material for Stable Phosphorescent OLEDs
Author(s) -
Wang Lin-Ye,
Chen Ling-Ling,
Huang Xiao-Lan,
Wang Mei,
Zhu Xu-Hui,
Zou Jian-Hua
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15111
Subject(s) - oled , phosphorescence , materials science , doping , triazine , context (archaeology) , electron , dopant , homo/lumo , electron transport chain , exciton , phosphine oxide , optoelectronics , analytical chemistry (journal) , chemistry , layer (electronics) , nanotechnology , physics , polymer chemistry , fluorescence , optics , condensed matter physics , molecule , organic chemistry , phosphine , biology , paleontology , biochemistry , quantum mechanics , catalysis
Organic electron‐transport materials (ETMs) play a critical role in enhancing performances and operational stability of organic light‐emitting diodes. In this context, we describe a triazine‐based electron‐transport material in high purity 6‐dphenylphosphinyl‐6′‐(4,6‐(tiphenyl‐1,3,5‐triazin‐2‐yl)[2,2′‐binaphthyl] (DPO‐2Na‐TRZ, MW= 685.75) via arylphosphine oxide modification. It exhibits a glass transition temperature of 130.8 °C. HOMO = −6.03 eV, LUMO = −3.08 eV. Its decomposition occurs at ca. 456 °C at 1% weight loss. Upon 50 wt% Liq doping, DPO‐2Na‐TRZ is investigated as an electron transport layer in bottom‐ and top‐emission green phosphorescent OLEDs. In the presence of an additional exciton‐blocking/electron‐transport layer, the resulting topemission OLED provides attractive characteristics. At a luminance of ca 1000 cd m −2 , LE = 91.6 cd A −1 , PE = 102.8 lm W −1 and EQE = 22.1 %. Moreover, under continuous driven at a constant current, an extraordinary lifetime t 99 > 600 h @ 1000 cd m −2 is observed.