Exceedingly efficient deep-blue electroluminescence from new anthracenes obtained using rational molecular design
作者:Soo-Kang Kim、Bing Yang、Yuguang Ma、Ji-Hoon Lee、Jong-Wook Park
DOI:10.1039/b805062g
日期:——
9,10-Bis(3′,5′-diphenylphenyl)anthracene [MAM], 9-(3′,5′-diphenylphenyl)-10-(3‴,5‴-diphenylbiphenyl-4″-yl)anthracene [MAT], and 9,10-bis(3″,5″-diphenylbiphenyl-4′-yl)anthracene [TAT] were newly synthesized through boration and Suzuki aryl–aryl coupling reactions. We have demonstrated that the EL performance of blue-light emitters can be optimized and improved by varying the chemical structures of the side groups. In the thin film state, the three materials exhibit PLmax values in the range of 439–445 nm. MAM, MAT, and TAT all have high Tg values above 120 °C; TAT has the highest Tg value, above 150 °C. This is twice as high as that of DPVBi (64 °C) and is much higher than that of MADN (120 °C) as well. It also exhibits excellent color coordinates (0.156, 0.088), which are very close to the NTSC blue standard, and an external quantum efficiency of 7.18%, twice that of MADN, which are the best reported results for deep-blue OLED emitters.
9,10-双(3′,5′-二苯基苯基)蒽[MAM]、9-(3′,5′-二苯基苯基)-10-(3‴,5‴-二苯基联苯-4″-基)蒽[MAT]和 9、和 9,10-双(3″,5″-二苯基联苯-4′-基)蒽[TAT]的新合成。我们已经证明,可以通过改变侧基的化学结构来优化和改善蓝光发射器的电致发光性能。在薄膜状态下,这三种材料的聚光最大值在 439-445 纳米范围内。MAM、MAT 和 TAT 的 Tg 值都高于 120 °C,其中 TAT 的 Tg 值最高,超过 150 °C。它是 DPVBi(64 °C)的两倍,也远高于 MADN(120 °C)。它还显示出非常接近 NTSC 蓝色标准的出色色坐标(0.156、0.088),以及 7.18% 的外部量子效率,是 MADN 的两倍,这些都是深蓝色 OLED 发光体的最佳结果。