A novel, bipolar host based on triazine for efficient solution-processed single-layer green phosphorescent organic light-emitting diodes

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• 作者：Bin Huang ; Wei Jiang ; Jinan Tang ; Xinxin Ban ; Ruigang Zhu ; Huange Xu ; Wen Yang ; Yueming Sun
• 关键词：OLEDs ; Solution-processed ; Electrophosphorescence ; Triazine ; Bipolar ; Host material
• 刊名：Dyes and Pigments
• 出版年：February, 2014
• 年：2014
• 卷：101
• 期：Complete
• 页码：9-14
• 全文大小：649 K

文摘

A novel N-phenyl carbazole substituted 2, 4,6-trisphenyl-triazine host material(TPCPZ) for solution processed green phosphorescent organic light-emitting devices (PhOLEDs) was synthesized by a Suzuki-cross coupling reaction. The optical, electrochemical and thermal properties of TPCPZ have been characterized. TPCPZ exhibits a high glass transition temperature of 165聽掳C and a triplet energy of 2.63聽eV. The appropriate HOMO energy level (鈭?.39聽eV) and LUMO energy level (鈭?.16聽eV) matching with the HOMO energy level of PEDOT:PSS(鈭?.35聽eV) and the LUMO energy level of Cs₂CO₃/Al bilayer cathode (鈭?.2聽eV), facilitate the transfer of holes and electrons. The solution-processed single-layer device using TPCPZ as the host for fac-tris(2-(4-phenylpyridine)iridium (Ir(ppy)₃) exhibited a low turn-on voltage of 3.5聽V, a maximum current efficiency of 20.8聽cd聽A^鈭? and a maximum luminance of 18,000聽cd聽m^鈭?. These results demonstrated that TPCPZ as a host material is advantageous for fabrication of highly efficient single-layer green PhOLEDs.