New Bipolar Host Materials for Realizing Blue Phosphorescent Organic Light-Emitting Diodes with High Efficiency at 1000 cd/m2

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• 作者：Min Ju Cho ; Sun Jae Kim ; Seung Hee Yoon ; Jicheol Shin ; Tae Ryang Hong ; Hyung Jong Kim ; Young Hoon Son ; Ju Sik Kang ; Hyun Ah Um ; Tae Wan Lee ; Jong-Kwan Bin ; Bang Sook Lee ; Joong Hwan Yang ; Gee Sung Chae ; Jang Hyuk Kwon ; Dong Hoon Choi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：6
• 期：22
• 页码：19808-19815
• 全文大小：442K
• ISSN：1944-8252

文摘

New host molecules such as 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pPCB2CZ) and 9-(6-(9H-carbazol-9-yl)pyridin-2-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mPCB2CZ) were designed and synthesized for blue phosphorescent organic light-emitting diodes (PhOLEDs). The glass transition temperatures of two host molecules were measured higher than 120 掳C, and the identical triplet energies were determined to be 2.92 eV for both molecules. The bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic)-doped mPCB2CZ-based PhOLED exhibited practically useful driving voltage of 4.8 V in a simple organic three layer device configuration which has a smaller number of interfaces in conventional multilayer PhOLEDs. Also, the high quantum efficiency of 23.7% is reported at the practically useful brightness value of 1000 cd/m².

Keywords:

organic light emitting diode; phosphorescence; bipolar host; carboline; quantum efficiency