期刊
JOURNAL OF APPLIED PHYSICS
卷 89, 期 7, 页码 3711-3719出版社
AMER INST PHYSICS
DOI: 10.1063/1.1330766
关键词
-
Transient electroluminescence (EL) from single- and multilayer organic light-emitting diodes (OLEDs) was investigated by driving the devices with short, rectangular voltage pulses. The single-layer devices consist of indium-tin oxide (ITO)/tris(8-hydroxy-quinoline)aluminum (Alq(3))/magnesium (Mg):silver (Ag), whereas the structure of the multilayer OLEDs are ITO/copper phthalocyanine (CuPc)/N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB)/Alq(3)/Mg:Ag. Apparent model-dependent values of the electron mobility (mu (e)) in Alq(3) have been calculated from the onset of EL for both device structures upon invoking different internal electric field distributions. For the single-layer OLEDs, transient experiments with different dc bias voltages indicated that the EL delay time is determined by the accumulation of charge carriers inside the device rather than by transport of the latter. This interpretation is supported by the observation of delayed EL after the voltage pulse is turned off. In the multilayer OLED the EL onset-dependent on the electric field-is governed by accumulated charges (holes) at the internal organic-organic interface (NPB/Alq(3)) or is transport limited. Time-of-flight measurements on 150-nm-thin Alq(3) layers yield weak field-dependent mu (e) values of the order of 1x10(-5) cm(2)/Vs at electrical fields between 3.9x10(5) and 1.3x10(6) V/cm. (C) 2001 American Institute of Physics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据