有机发光二极管
材料科学
光致发光
量子效率
荧光
接受者
光电子学
光化学
猝灭(荧光)
半最大全宽
共发射极
吖啶
亮度
偶极子
激子
二极管
化学
光学
纳米技术
有机化学
物理
量子力学
图层(电子)
凝聚态物理
作者
Tao Hua,Kao‐Lang Liu,Chih‐Wei Huang,Nengquan Li,Changjiang Zhou,Zhongyan Huang,Xiaosong Cao,Chung‐Chih Wu,Chuluo Yang
标识
DOI:10.1016/j.cej.2021.133598
摘要
Highly efficient blue thermally activated delayed fluorescence (TADF) materials with high horizontal dipole orientation (Θ//) remain a big challenge due to the concentration quenching effects and serious efficiency roll-offs in their corresponding organic light-emitting diodes (OLEDs). We herein report two novel TADF compounds, namely 2TDBA-SBA and TDBA-SBA, which were facilely synthesized by utilizing a rigid oxygen-bridged cyclized triarylboron-based unit (TDBA) as the acceptor and a spiro acridine (SBA) as the donor. Benefiting from the rigid and planar skeleton of the acceptor and the linear molecular shape, high Θ//s and photoluminescence quantum yields (PLQYs) of ∼ 90% were achieved. Significantly, TDBA-SBA exhibited excellent TADF properties with a short delayed fluorescence lifetime of only 684 ns and narrow full-width at half-maximum (FWHM) of 44 nm in solution state, accompanied by the high PLQYs of over 80% at high doping concentrations, manifesting the alleviated exciton quenching effects. Consequently, OLEDs based on TDBA-SBA achieved a high maximum external quantum efficiency (EQE) of 29.3% and a maximum brightness of 27663 cd cm−2. Importantly, an EQE over 20% was realized even at the high brightness of 10000 cd cm−2, signifying a small efficiency roll-off.
科研通智能强力驱动
Strongly Powered by AbleSci AI