High-efficiency near-infrared fluorescent organic light-emitting diodes with small efficiency roll-off based on AIE-active phenanthro[9,10-<i>d</i>]imidazole derivatives
作者:Futong Liu、Yongbo Tan、Hui Liu、Xiangyang Tang、Lei Gao、Chunya Du、Jiarui Min、Haixu Jin、Ping Lu
DOI:10.1039/d0tc00102c
日期:——
realization of high-efficiency and low-cost in fluorescent organic light-emitting diodes (OLEDs) is still a formidable challenge in the deep-red (DR)/near-infrared (NIR) region because of the intrinsic limitation of the energy-gap law and fluorescence quenching effect. Herein, three novel donor–acceptor–donor′ (D–A–D′) fluorophores, PIBz-10-PTZ, PIBz-10P-PTZ and PIBz-3-PTZ, by utilizing phenanthro[9,10-d]imidazole
由于能量的固有局限性,在荧光有机发光二极管(OLED)中同时实现高效和低成本仍然是深红(DR)/近红外(NIR)区域中的巨大挑战。隙定律和荧光猝灭作用。这里,三种新的供体-受体-供体'(d-A-d')的荧光团,PIBz -10- PTZ,PIBz-10P-PTZ和PIBz -3- PTZ,通过利用菲并[9,10- d ]咪唑和合成了吩噻嗪作为供体和苯并噻二唑作为受体。由于相邻氢原子之间沿水平轴的单边位阻,PIBz-3-PTZ具有完全平面的构型和完全共轭的结构。PIBz-3-PTZ在纯净薄膜中表现出很强的DR发射和聚集诱导发射(AIE)特性,并具有35%的高光致发光量子产率。未掺杂的OLED实现了2.02%的最大外部量子效率(EQE),发射峰位于672 nm,亮度高达3403 cd m -2。另外,该器件能够在100 cd m -2的高亮度下保持1.69%的EQE ,而低效率滚降为16%,这