Electrical and optical characteristics of red organic light-emitting diodes doped with two guest dyes

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• 作者：Li ; Feng ; Lin ; Jiuling ; Feng ; Jing ; Cheng ; Gang ; Liu ; Hongyu ; Liu ; Shiyong ; Zhang ; Ligong ; Zhang ; Xiufeng ; et. al.
• 关键词：Organic light-emitting diodes ; Energy transfer ; Time-resolved photoluminescence spectra
• 刊名：Synthetic Metals
• 出版年：2003
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：September 5, 2003
• 卷：139
• 期：2
• 页码：341-346
• 文件大小：198 K

摘要

We report the red organic light-emitting diodes doped with rubrene and 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB). N,N′-Diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine (NPB) and doped tri-(8-hydroxyquinoline)aluminum (Alq₃) are used as hole and electron-transport layers, respectively. The performances of the co-doped diodes are found to be improved compared to only DCJTB doped diodes. We attribute the improvement to rubrene that assists the energy transfer from Alq₃ to DCJTB more efficiency. The energy transfer rates from Alq₃ to DCJTB, from Alq₃ to rubrene, and from rubrene to DCJTB are proximately calculated to be 1.04×10⁹, 3.89×10⁹, and 2.79×10⁹s⁻¹ according to the fit of the fluorescence decay curves, respectively. It can be seen clearly that the energy transfer rate from Alq₃ to DCJTB through rubrene is 2.7 times higher than that from Alq₃ to DCJTB directly.