Synthesis, photophysical and optoelectronic properties of quinazoline-centered dyes and their applications in organic light-emitting diodes
Synthesis, photophysical and optoelectronic properties of quinazoline-centered dyes and their applications in organic light-emitting diodes
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喹唑啉中心染料的合成、光物理和光电性能及其在有机发光二极管中的应用
DOI：
10.1016/j.dyepig.2015.10.042
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发表时间：
2016-02
影响因子：
4.5
通讯作者：
Zixing Wang
中科院分区：
文献类型：
--
作者：
Jianhua Zhang;Jian Hao;Jin Cao;Zixing Wang
合成了含苯并咪唑、咔唑和三苯基团的喹唑啉中心衍生物。详细讨论了它们的电化学性质、光物理性质和光电性质与结构的关系。用它们作为衬底材料，获得了最大的外量子效率为19.2%，电流效率为18.3cd/A，功率效率为21.7mlm/W，4-[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]-2-[3-(tri-phenylen-2-yl)phen-3-yl]quinazoline，为18.4%，17.6cd/A，4-(9-phenyl-9H-carbazol-3-yl)-2-[3-(triphenylen-2-yl)phenyl]quinazoline，为19.3百万/W，2，4-bis[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]quinazoline，为15.6%，CD/A为14.4%，CD/A为16.7百万/W，2，4-bis(9-phenyl-9H-carbazol-3-yl)quinazoline，为17.4%，16.7亿/A，15.7百万/W。此外，提高基质材料的电子注入/传输能力可以理想地提高有机电致发光二极管在低工作电压下的性能，而利用双极材料增强空穴传输能力可以平衡载流子在高工作电压下保持高效率。这些材料具有较高的玻璃化转变温度146-154℃和分解温度400-447℃。
Quinazoline-centered derivatives with benzoimidazole, carbazole, and triphenylene moieties, were synthesized. Their relationships between electrochemical, photophysical, and optoelectronic properties and structure were discussed in detail. Efficient red phosphorescent organic light-emitting diodes with low turn-on voltage were demonstrated by using them as host materials, and achieved maximum external quantum efficiencies, current efficiencies, and power efficiencies of 19.2%, 18.3 cd/A, 21.7 lm/W for 4-[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]-2-[3-(tri-phenylen-2-yl)phen-3-yl]quinazoline, of 18.4%, 17.6 cd/A, 19.3 lm/W for 4-(9-phenyl-9H-carbazol-3-yl)-2-[3-(triphenylen-2-yl)phenyl]quinazoline, of 15.6%, 14.4 cd/A, 16.7 lm/W for 2,4-bis[4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl]quinazoline, and of 17.4%, 16.7 cd/A, 15.7 lm/W for 2,4-bis(9-phenyl-9H-carbazol-3-yl)quinazoline, respectively. Moreover, improving the electron-injection/transport abilities of host materials could ideally improve the performance of organic light-emitting diodes under low operation voltage, while enhancement of hole-transporting abilities by using bipolar materials could balance the carriers to maintain high efficiency under high operating voltage. These materials exhibited high glass-transition temperature of 146–154 °C and decomposition temperature of 400–447 °C.
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