Transient electroluminescence measurements on organic heterolayer light emitting diodes

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• 作者：M&uuml ; ckl ; Anton G. ; Berleb ; Stefan ; Br&uuml ; tting ; Wolfgang ; Schwoerer ; Markus
• 关键词：Electroluminescence measurements ; Alq₃ ; Light emitting diodes
• 刊名：Synthetic Metals
• 出版年：2000
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：June 1, 2000
• 卷：111-112
• 期：Complete
• 页码：91-94
• 文件大小：141 K

摘要

We have investigated the field dependence of the electron and hole drift mobility in tris-(8-hydroxyquinoline) aluminium (Alq₃) in organic multi layer light emitting diodes (LEDs) using transient electroluminescence measurements. The electron transport in thin films of Alq₃ can be understood in terms of hopping processes. We obtain a full set of parameters for a modified Poole–Frenkel equation describing the temperature and field dependence of the electron drift mobility. For the measurement of the hole drift mobility, a special device structure was designed. We were able to determine the hole drift mobility in Alq₃ and found good agreement with the data obtained from previous time-of-flight (TOF) measurements.