咔唑
有机发光二极管
分子间力
兴奋剂
光化学
材料科学
电致发光
硼
取代基
光致发光
共振(粒子物理)
化学
分析化学(期刊)
分子
光电子学
有机化学
纳米技术
物理
图层(电子)
粒子物理学
作者
Yufei Chang,Yunxiang Wu,Kaiyuan Zhang,Shumeng Wang,Xingdong Wang,Shiyang Shao,Lixiang Wang
标识
DOI:10.1016/j.dyepig.2023.111678
摘要
Multi-resonance emitters are attractive for organic light-emitting diode (OLED) applications because of their narrowband emissions and high photoluminescent efficiencies. Nevertheless, their tendency to aggregation by intermolecular interactions could cause doping sensitivity and reduce color purity at high concentrations. Here, we report a novel boron, sulfur (B, S)-containing multi-resonance emitter (BSS-Ph-TBCz) consisting of 1,8-diphenyl-carbazole substituent at para-position of boron atom of B, S-doped polycyclic aromatic skeleton. Different from control compound (BSS-TBCz) containing conventional carbazole substituents showing aggregation-caused spectral broadening, BSS-Ph-TBCz with 1,8-diphenyl-carbazole group exhibits weak intermolecular aggregation behavior owing to the large twist angle between polycyclic skeleton and carbazole plane caused by two steric phenyl groups on carbazole group, leading to nearly unchanged emissions with small full width at half-maximum of 30–31 nm at doping concentration ranging from 1 to 100 wt%. OLEDs employing BSS-Ph-TBCz as emitter reveal blue electroluminescence at 468 nm and maximum external quantum efficiency of 21.4% at 5 wt% doping concentration, which remains at 20.1% at high doping concentration of 25 wt%.
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