Synthesis of Soluble Host Materials for Highly Efficient Red Phosphorescent Organic Light-Emitting Diodes
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- 作者：Min Chul Suh ; So-Ra Park ; Ye Ram Cho ; Dong Heon Shin ; Pil-Gu Kang ; Dong A Ahn ; Hyung Suk Kim ; Chul-Bae Kim
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：July 20, 2016
- 年：2016
- 卷：8
- 期：28
- 页码：18256-18265
- 全文大小：624K
- 年卷期：0
- ISSN：1944-8252
文摘
New soluble host materials with benzocarbazole and triphenyltriazine moieties, 11-[3-(4,6-diphenyl-[1,3,5]triazin-2-yl)-phenyl]-11H-benzo[a]carbazole and 11-[3′-(4,6-diphenyl-[1,3,5]triazin-2-yl)-biphenyl-4-yl]-11H-benzo[a]carbazole, were synthesized for highly efficient red phosphorescent organic light-emitting diodes (PHOLED). Hole-transporting benzocarbazole moiety and electron transporting triphenyltriazine moiety, which are severely twisted each other enhance the solubility of those materials in common organic solvent. The improved solubility from this molecular design could be due to a reduced π–π stacking interaction, which gives a very uniform film morphology after spin coating of those materials. As a result, we obtained highly efficient soluble PHOLEDs combined with an evaporated blue common layer structure. The resultant red PHOLED exhibited the maximum current efficiency as well as external quantum efficiency values up to 23.7 cd/A and 19.0%.