机械容积
有机发光二极管
兴奋剂
材料科学
光电子学
蓝光
荧光粉
光学
纳米技术
物理
图层(电子)
作者
Dong‐Dong Xie,Hao-Sen Liao,Yi-Hua Jian,Dong Chen,Haijun Chi,Bao-Yue Wang,Yanli Lv,Dong Yan,Xiao Li
标识
DOI:10.1016/j.dyepig.2022.110951
摘要
The hot exciton materials with high-lying reverse intersystem crossing provide great potential for the realization of efficient, low-cost and stable organic light-emitting diodes (OLEDs). However, it is highly desired but still challenging to achieve high-performance non-doped blue OLEDs with hot exciton luminogens. In this work, a new hybridized local and charge transfer (HLCT) luminogen 2-(4-(2-(4-(1,2,2-triphenylvinyl)phenyl)-1 H -phenanthro[9,10- d ]imidazol-1-yl)phenyl)phenanthro[9,10- d ]oxazole (abbreviated as TPE-PI-PO) with the incorporation of tetraphenylethylene is obtained for constructing the high-performance non-doped blue OLEDs. TPE-PI-PO possesses the multifunctional features of aggregation-induced emission (AIE), HLCT and mechanoluminescence with high photoluminescence quantum yield (58%) in the neat film. The non-doped OLEDs based on TPE-PI-PO exhibits sky-blue emission, high luminance of 13,020 cd m −2 and the maximum efficiencies of 11.62 cd A −1 , 5.08% with the negligible efficiency roll-off as low as 1.6% at 1000 cd m −2 . The electroluminescent performance is highly competitive with the best reported non-doped blue fluorescent OLEDs based on AIE luminogens. These results can shed light on a feasible design principle to develop high-quality HLCT-type luminogens for high-performance non-doped blue OLEDs. • The sky-blue luminogen TPE-PI-PO is synthesized. • PE-PI-PO demonstrates the multifunctional property of HLCT, AIE and mechanoluminescence. • Non-doped OLEDs based on TPE-PI-PO achieve the EQE max of 5.08%. • Non-doped OLEDs demonstrate sky-blue emission with CIE of (0.26, 0.30). • Negligible efficiency roll-off of 1.6% at high luminance is displayed.
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