https://scholars.lib.ntu.edu.tw/handle/123456789/543331
標題: | Bistriazoles with a Biphenyl Core Derivative as an Electron-Favorable Bipolar Host of Efficient Blue Phosphorescent Organic Light-Emitting Diodes | 作者: | JIUN-HAW LEE Chen, C.-H. Lin, B.-Y. Lan, Y.-H. Huang, Y.-M. Chen, N.-J. Huang, J.-J. Volyniuk, D. Keruckiene, R. Grazulevicius, J.V. YUH-RENN WU MAN-KIT LEUNG Chiu T.-L. |
關鍵字: | bipolar; electron transport; organic light-emitting diode; sky-blue phosphorescence; wide bandgap | 公開日期: | 2020 | 卷: | 12 | 期: | 44 | 起(迄)頁: | 49895 - 49904 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | High-quality host materials are indispensable for the construction in the emitting layer of efficient organic light-emitting diodes (OLEDs), especially in a guest and host system. The good carrier transport and energy transfer between the host and emitters are out of necessity. In this work, a wide bandgap and bipolar organic compound, 2,2′-bis(4,5-diphenyl-(1,2,4)-triazol-3-yl)biphenyl (BTBP), conjugating two electron-transporting triazole moieties on a hole-transporting biphenyl core, was synthesized and characterized. The wide bandgap of 4.0 eV makes the promise in efficient energy transfer between the host and various color emitters to apply as the universal host, especially for blue emitters. The close electron and hole mobilities perform the same order of 10-5 cm2·V-1·s-1, identified as bipolar behavior and benefited for carrier balance at low bias. Although carrier transportation belongs to bipolar behavior at a low electrical field, the electron mobility is much faster than the hole one at a high electrical field and belongs to electron-transporting behavior. Employing the BTBP as the host matrix mixed with a phosphor dopant, iridium(III)bis[4,6-di-fluorophenyl-pyridinato-N,C2]picolinate, a high-efficiency sky-blue phosphorescent organic light-emitting diode (OLED) was achieved with a maximum current efficiency of 65.9 cd/A, maximum power efficiency of 62.8 lm/W, and maximum external quantum efficiency of 30.2%. © 2020 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85095673966&partnerID=40&md5=e3878f96d026954215cdaa69ed492d7e https://scholars.lib.ntu.edu.tw/handle/123456789/543331 |
ISSN: | 19448244 | DOI: | 10.1021/acsami.0c13705 |
顯示於: | 化學系 |
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