系统间交叉
量子效率
光化学
荧光
材料科学
共振(粒子物理)
量子产额
光电子学
单重态
化学
原子物理学
激发态
光学
物理
作者
Siyuan Cai,Glenna So Ming Tong,Lili Du,Gary Kwok‐Ming So,Faan‐Fung Hung,Tsz‐Lung Lam,Gang Cheng,Hui Xiao,Xiaoyong Chang,Zong‐Xiang Xu,Chi‐Ming Che
标识
DOI:10.1002/anie.202213392
摘要
Acceleration of singlet-triplet intersystem crossings (ISC) is instrumental in bolstering triplet exciton harvesting of multi-resonance thermally activated delayed fluorescent (MR-TADF) emitters. This work describes a simple gold(I) coordination strategy to enhance the spin-orbit coupling of green and blue BN(O)-based MR-TADF emitters, which results in a notable increase in rate constants of the spectroscopically observed ISC process to 3×109 s-1 with nearly unitary ISC quantum yields. Accordingly, the resultant thermally-stable AuI emitters attained large values of delayed fluorescence radiative rate constant up to 1.3×105 /1.7×105 s-1 in THF/PMMA film while preserving narrowband emissions (FWHM=30-37 nm) and high emission quantum yields (ca. 0.9). The vapor-deposited ultrapure-green OLEDs fabricated with these AuI emitters delivered high luminance of up to 2.53×105 cd m-2 as well as external quantum efficiencies of up to 30.3 % with roll-offs as low as 0.8 % and long device lifetimes (LT60 ) of 1210 h at 1000 cd m-2 .
科研通智能强力驱动
Strongly Powered by AbleSci AI