Electroluminescent Spectral Stability of Multilayer Doping White Organic Light-Emitting Diodes

LU Jun-fu; ZHANG Fang-hui; LIU Ding-han; JIANG Qian

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Electroluminescent Spectral Stability of Multilayer Doping White Organic Light-Emitting Diodes

Device Technology & Physics | 更新时间：2020-08-12

- Electroluminescent Spectral Stability of Multilayer Doping White Organic Light-Emitting Diodes
- Chinese Journal of Liquid Crystals and Displays Vol. 25, Issue 3, Pages: 370-374(2010)
- 作者机构：
  
  陕西科技大学电气与信息工程学院,陕西西安 710021,E-mail:tigerlang@163.com
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN383+.1
- Received：31 October 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 June 2010，
  
  Published：30 June 2010
- 稿件说明：
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陆君福;张方辉;刘丁菡;蒋谦. 多层掺杂白光有机电致发光器件的光谱稳定性[J]. 液晶与显示, 2010,25(3): 370-374

LU Jun-fu;ZHANG Fang-hui;LIU Ding-han;JIANG Qian. Electroluminescent Spectral Stability of Multilayer Doping White Organic Light-Emitting Diodes[J]. 液晶与显示, 2010,25(3): 370-374
陆君福;张方辉;刘丁菡;蒋谦. 多层掺杂白光有机电致发光器件的光谱稳定性[J]. 液晶与显示, 2010,25(3): 370-374 DOI：

LU Jun-fu;ZHANG Fang-hui;LIU Ding-han;JIANG Qian. Electroluminescent Spectral Stability of Multilayer Doping White Organic Light-Emitting Diodes[J]. 液晶与显示, 2010,25(3): 370-374 DOI：

摘要

分析了分别以Al/LiF为复合阴极和以Ca ∶ Al合金为阴极的两种掺杂型白光有机电致发光器件在不同驱动电流下的EL光谱以及色坐标的变化。器件结构分别为:Al/LiF/Alq

∶ C545T/Alq

∶ DCJTB/ADN ∶ TBP/NPB/2T-NATA/ITO/Glass;Ca ∶ Al/ Alq

∶ C545T/Alq

∶ DCJTB/AND ∶ TBP/NPB/2T-NATA/ITO/Glass。并利用直接载流子俘获(DCT)过程和能量传递(ET)过程对器件的发光机理进行了讨论。结果发现:两种白光器件的EL光谱波峰位置几乎是相同的

且不随电流的改变而变化;在相同驱动电流下

以Al/LiF为复合阴极的器件的绝对光谱较强;随着驱动电流的变化

对于Ca ∶ Al合金为阴极的白光器件

其相对光谱及色坐标的变化相对较小

并且在较低的驱动电流下色坐标就能达到比较稳定的状态。说明以Ca ∶ Al合金为阴极有利于提高OLEDs的EL光谱的稳定性。

Abstract

The electroluminescent spectra and CIE coordinate variation of doping-type white organic light-emitting devices with Al/ LiF

Ca ∶ Al as cathode are analyzed under different driving current. The devices are respectively fabricated with the structure of ITO/2T-NATA/NPB/ADN ∶ TBP/Alq

∶ DCJTB/Alq

∶ C545T/LiF/Al and ITO/2T-NATA/NPB/ADN ∶ TBP/Alq

∶ DCJTB/Alq

∶ C545T/Ca ∶ Al. Additionally

the light emitting process was discussed according to the Direct Carrier Trapping (DCT) and Energy Transfer (ET) theory. The results indicated that two different devices have similar peaks position and they have no shift as the driving current increasing. But absolute spectra of device with Al/LiF as cathode is much more intensive under the same driving current; the device with Ca ∶ Al as cathode has much slighter variation of relative spectra and CIE coordinate when the driving current changed and can reach stable state under low driving current. It indicated that Ca ∶ Al cathode contribute much to the electroluminescent stability of organic light-emitting device.

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references

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