有机发光二极管
量子效率
蒽
苯甲腈
材料科学
光电子学
光致发光
电致发光
荧光
光化学
兴奋剂
化学
光学
纳米技术
有机化学
物理
图层(电子)
作者
Longjiang Xing,Ze‐Lin Zhu,Jia He,Zhipeng Qiu,Zhiwen Yang,Dan Lin,Wen‐Cheng Chen,Qingdan Yang,Shaomin Ji,Yanping Huo,Chun‐Sing Lee
标识
DOI:10.1016/j.cej.2020.127748
摘要
Three new anthracene-based emitters, 4-(10-(9,9′-spirobi[fluoren]-2-yl)anthracen-9-yl)benzonitrile (SBF-AnCN), 4-(10-(9,9-diphenyl-9H-fluoren-2-yl)anthracen-9-yl)benzonitrile (DPF-AnCN) and 4-(10-(9,9-dimethyl-9H-fluoren-2-yl)anthracen-9-yl)benzonitrile (DMF-AnCN) are developed for deep blue organic light-emitting diodes (OLEDs). Their photophysical properties, thermal properties, molecular configurations and device performances have been systematically investigated. As verified by crystallographic study, these anthracene derivatives possess highly twisted configuration, leading to deep-blue light emission by restraining π-conjugation extension. Furthermore, the difference in the molecular packing manner may influence the photoluminescence quantum yields (PLQYs) in solid state and the proportion of singlet exciton harvested by triplet–triplet annihilation (TTA) process. A nondoped device fabricated using DPF-AnCN as emitter exhibits a maximum external quantum efficiency (EQE) of 7.1% with insignificant efficiency roll-off (6.6%@1000 nit) and Commission Internationale de L’Eclairage (CIE) index of (0.149, 0.104), approaching the standard blue index of the National Television System Committee (NTSC) of (0.14, 0.08). It is demonstrated that TTA is responsible for the excellent electroluminescence (EL) performance. In comparison with doped OLEDs, transient EL decay measurements demonstrate that TTA process is more efficient in the nondoped device. This work would provide an efficient method for designing deep-blue nondoped EL materials.
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