TRANSIENT ELECTROLUMINESCENCE FROM HOLE TRANSPORTING EMITTING LAYER IN NANOSECOND REGION

被引:64
作者
HOSOKAWA, C
TOKAILIN, H
HIGASHI, H
KUSUMOTO, T
机构
[1] Central Research Laboratories, Idemitsu Kosan Co., Ltd., Sodegaura, Chiba 299-02
关键词
D O I
10.1063/1.109718
中图分类号
O59 [应用物理学];
学科分类号
摘要
Transient electroluminescence (EL) for an organic thin film cell with a hole transporting emitting layer was observed by short voltage pulse measurements. For the cell with indium tin oxide/hole transporting emitting layer/Mg:Ag structure, we realized very fast response at a time about 20 ns. This response time has been the fastest in organic EL ever reported. In these measurements, we could observe carrier transit time. We found that this carrier transit time was attributed to that of holes in the emitting layer. The hole mobility in 120-nm-thick emitting layer was obtained to be 1 +/- 0. 3 X 10(-3) CM2/V s in the electric field region from 1 to 3 MV/cm. Furthermore, we could observe the fast EL decay component with a time constant of 3.0 +/- 1.5 ns, which was essentially attributed to the decay of singlet excited states.
引用
收藏
页码:1322 / 1324
页数:3
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