Pure red organic light-emitting diode based on a europium complex

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• 作者：Qin Xue ; Ping Chen ; Jianhua Lu ; Guohua Xie ; Jingying Hou ; Shiyong Liu ; Yi Zhao ; Liying Zhang ; Bin Li
• 关键词：Red organic light-emitting diode ; Europium complex
• 刊名：Solid-State Electronics
• 出版年：2009
• 出版时间：March 2009
• 年：2009
• 卷：53
• 期：3
• 页码：397-399
• 全文大小：344 K

文摘

A hole-blocking layer, 4,7-diphenyl-1,10-phenanthroline (Bphen), was introduced between the emission layer (EML) and the electron-transporting layer (ETL) for a europium complex based organic red light-emitting device. Such a structure helps to reduce hole leakage from the EML into the ETL, resulting in improved purity of emissive light. Optimum Bphen thickness of around 10 nm was observed to produce a current efficiency of 3.1 cd/A and brightness of 465.2 cd/m² at 14 V. With 10 nm Bphen layer, the red emission spectrum shows excellent color saturation with Commission Internationale De L’Eclairage coordinates of (0.64, 0.33) at 7 V.