Study of the Effect of Film Thickness on the Performance of NPB/Alq<sub>3</sub> Double Layer Organic Light-Emitting Diodes

SUO Fan; YU Jun-sheng; LI Wei-zhi; DENG Jing; LIN Hui; JIANG Ya-dong

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Study of the Effect of Film Thickness on the Performance of NPB/Alq₃ Double Layer Organic Light-Emitting Diodes

更新时间：2025-07-16

- Study of the Effect of Film Thickness on the Performance of NPB/Alq₃ Double Layer Organic Light-Emitting Diodes
- Acta Electronica Sinica Vol. 35, Issue 11, Pages: 2050-2054(2007)
- 作者机构：
  
  电子科技大学光电信息学院,电子薄膜与集成器件国家重点实验室,四川,成都,610054
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN383+.1
- Published：2007
- 稿件说明：
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SUO Fan, YU Jun-sheng, LI Wei-zhi, et al. Study of the Effect of Film Thickness on the Performance of NPB/Alq₃ Double Layer Organic Light-Emitting Diodes[J]. Acta Electronica Sinica, 2007, 35(11): 2050-2054.
DOI：

SUO Fan, YU Jun-sheng, LI Wei-zhi, et al. Study of the Effect of Film Thickness on the Performance of NPB/Alq₃ Double Layer Organic Light-Emitting Diodes[J]. Acta Electronica Sinica, 2007, 35(11): 2050-2054. DOI：

摘要

研究了以NPB为空穴传输层、Alq

为发光层的双层异质结有机电致发光器件的薄膜厚度对器件性能的影响.制备了一系列具有不同NPB和Alq

厚度的器件并测试了其电致发光特性.结果表明

器件电流随Alq

与NPB厚度变化的关系并不相同.不同有机层厚度双层器件的电流机制符合陷阱电荷限制(TCL)理论

随外加电压的增大

器件电流经历了欧姆电导区、TCL电流区、陷阱电荷限制-空间电荷限制(TCL-SCL)过渡区三个区域的变化.当有机层厚度匹配为NPB(20nm)/Alq

(50nm)时可以获得性能优良的器件.器件的流明效率-电压关系曲线的变化规律是在低电压区较快达到最大值

然后随电压的增加逐渐降低.

Abstract

We studied the effect of thin film thickness on the performance of double-layer heterojunction organic light-emitting diodes (OLEDs) based on 4

4'-bis biphenyl (NPB) as hole transporting layer and tris-(8-hydroxylquinoline)-aluminum (Alq

) as emitting layer.Various devices with different NPB and Alq

thickness were fabricated and their electroluminescent characteristics were investiagted.The results show that the device current dosen’t change with Alq

or NPB film thickness in the same trend.The current mechanism of devices with different organic film thicknesses conforms with the theory of trapped charge limited current(TCLC).Current varies from oh

mic conduction region

TCL region to trapped charge limited-space charge limited (TCLC-SCLC) transition region with the increase of applied voltage.High device performance could be obtained when thin film thickness is NPB(20 nm)/Alq

(50 nm).The luminance efficiency-voltage curves of devices reached to the maximum under low-voltage

and gradually decreased with rising voltage.

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Numerical Fitting Analysis of Current Conduction in Organic Light-Emitting Diodes Based on Single Alq₃ Layer with Various Film Thickness

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YU Jun-sheng

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State Key Lab of Electronic Thin Films and Integrated Devices,School of Optoelectronic Information,University of Electronic Science and Technology of China(UESTC)

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Study of the Effect of Film Thickness on the Performance of NPB/Alq₃ Double Layer Organic Light-Emitting Diodes