Chen Shuo, Wu Yukun, Hu Shoucheng, Zhao Yi, Fang Daining
State Key Laboratory for Turbulence and Complex System, College of Engineering, Peking University, Chengfu Road, Haidian District, Beijing, 100871, People's Republic of China.
State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
J Fluoresc. 2017 Mar;27(2):451-461. doi: 10.1007/s10895-016-1970-5. Epub 2016 Nov 29.
A novel deep-blue emitter PhImPOTD based on phenathroimidazole was synthesized, which is incorporated by an electron-donating dibenzothiophene unit and electron-withdrawing phenanthroimidazole and diphenylphosphine oxide moieties. Furthermore, the weak π-π stacking and intermolecular aggregation render the photoluminescence quantum yield is as high as 0.34 in the solid state. Non-doped organic light emitting diodes (OLEDs) based on PhImPOTD emitter exhibits a low turn-on voltage of 3.6 V, a favorable efficiency of 1.13 cd A and a deep blue emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.08). The CIE is very close to the NTSC (National Television Standards Committe) blue standard (CIE: 0.14, 0.08). PhImPOTD is also utilized as blue emitter and the host for a yellow emitter (PO-01) to fabricate white organic light-emitting diodes (WOLEDs). This gives a forward-viewing maximum CE of 4.83 cd A and CIE coordinates of (0.32, 0.32) at the luminance of 1000 cd m. Moreover, the single-carrier devices unambiguously demonstrate that typical bipolar-dominant characteristics of PhImPOTD. This work demonstrates not only that the phenanthroimidazole unit is an excellent building block to construct deep blue emission materials, but also the introduction of a diphenylphosphine oxide deprotonation substituent is an efficient tactic for harvesting deep-blue emitting devices.
合成了一种基于菲并咪唑的新型深蓝色发光体PhImPOTD，它由供电子的二苯并噻吩单元以及吸电子的菲并咪唑和二苯基氧化膦部分组成。此外，其较弱的π-π堆积和分子间聚集使得固态下的光致发光量子产率高达0.34。基于PhImPOTD发光体的非掺杂有机发光二极管（OLED）开启电压低至3.6 V，效率良好，为1.13 cd/A，发射深蓝色光，国际照明委员会（CIE）坐标为(0.15, 0.08)。该CIE坐标非常接近美国国家电视标准委员会（NTSC）的蓝色标准（CIE：0.14, 0.08）。PhImPOTD还被用作蓝色发光体以及黄色发光体（PO-01）的主体来制备白色有机发光二极管（WOLED）。在1000 cd/m²的亮度下，其正向最大电流效率为4.83 cd/A，CIE坐标为(0.32, 0.32)。此外，单载流子器件明确证明了PhImPOTD具有典型的双极性主导特性。这项工作不仅表明菲并咪唑单元是构建深蓝色发光材料的优良结构单元，而且引入二苯基氧化膦去质子化取代基是获得深蓝色发光器件的有效策略。
