We report a high-efficiency blue organic light-emitting diode (OLED) with a solution-processed emissive layer composed of an oligomeric host of poly[3-(carbazol-9-ylmethyl)-3-methyloxetane] (PCMO) that possesses high triplet-energy and high electron mobility. The device exhibited a current efficiency of 40.4 cd A−1 with an external quantum efficiency (EQE) of 21.6% and power efficiency of 28.2 lm W−1 at 230 cd m−2 or 24.7 cd A−1, 10.3%, and 15.5 lm W−1 at 1 000 cd m−2. The high efficiency may be attributed to the host possessing a high electron mobility and lower electron injection barrier, resulting in a more balanced carrier-injection. Moreover, the high electron-mobility favors the transport of electrons, resulting in a more balanced carrier-injection in the emissive layer. The device efficiency has been further enhanced to 42.6 cd A−1 (22.9%, 29.7 lm W−1) at 124 cd m−2 or 28.8 cd A−1 (15.4%, 17.8 lm W−1) at 1 000 cd m−2 by pre-heating the emissive solution at an elevated temperature before spin-coating.
我们报道了一种高效蓝色有机发光二极管(OLED),其具有由聚[3-(
咔唑-9-基甲基)-3-甲基氧杂
环丁烷](PCMO)低聚物主体组成的溶液处理发射层,具有高三线态能量和高电子迁移率。该器件的电流效率为 40.4 cd A−1,外量子效率 (EQE) 为 21.6%,功率效率为 28.2 lm W−1(在 230 cd m−2 或 24.7 cd A−1、10.3% 和 15.5 时) 1 000 cd m−2 时为 lm W−1。高效率可能归因于主体具有高电子迁移率和较低的电子注入势垒,从而导致更平衡的载流子注入。此外,高电子迁移率有利于电子传输,从而使发射层中的载流子注入更加平衡。器件效率进一步提高至 124 cd m−2 时的 42.6 cd A−1 (22.9%, 29.7 lm W−1) 或 1 000 cd m 时的 28.8 cd A−1 (15.4%, 17.8 lm W−1) -2 通过在旋涂之前在高温下预热发射溶液。