Starburst 4,4′,4′′-tris(carbazol-9-yl)-triphenylamine-based deep-blue fluorescent emitters with tunable oligophenyl length for solution-processed undoped organic light-emitting diodes
作者:Mingquan Yu、Shumeng Wang、Shiyang Shao、Junqiao Ding、Lixiang Wang、Xiabin Jing、Fosong Wang
DOI:10.1039/c4tc02173h
日期:——
Interestingly, on going from 2P-TCTA to 5P-TCTA, the film photoluminescence quantum yield is gradually enhanced from 11.4% to 35.5%. The same trend is also observed for their corresponding solution-processed undoped OLEDs. As a consequence, 5P-TCTA shows the best device performance, revealing a maximum luminescence of 7300 cd m−2, and a peak luminous efficiency of 2.48 cd A−1 (2.15 lm W−1; 2.30%) together
在众所周知的空穴传输材料4,4',4''-三(咔唑-9-基)-三苯胺(TCTA)的基础上,一系列星形深蓝色荧光发射器(2P- TCTA,3P-TCTA,4P-TCTA和5P-TCTA已成功通过两个N原子之间的低聚苯基链的简单延伸。当苯环的数量增加时,发现这些基于TCTA的星爆的吸收和发射均发生红移,并最终对由五苯基桥组成的5P-TCTA饱和。有趣的是,从2P-TCTA到5P-TCTA,薄膜的光致发光量子产率从11.4%逐渐提高到35.5%。对于它们相应的溶液处理的未掺杂OLED,也观察到了相同的趋势。结果,5P-TCTA显示出最佳的器件性能,最大发光量为7300 cd m -2,峰值发光效率为2.48 cd A -1(2.15 lm W -1; 2.30%)以及CIE坐标为(0.15,0.09)。