Improved Light Out-Coupling in Organic Light Emitting Diodes Employing Organic Capping Layer

LI Yan-fei; ZHANG Fang-hui; MU Xi-yuan; DU Hong-bing

doi:10.3788/YJYXS20122703.0308

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Improved Light Out-Coupling in Organic Light Emitting Diodes Employing Organic Capping Layer

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

- Improved Light Out-Coupling in Organic Light Emitting Diodes Employing Organic Capping Layer
- Chinese Journal of Liquid Crystals and Displays Vol. 27, Issue 3, Pages: 308-312(2012)
- 作者机构：
  
  1. 陕西科技大学电气与信息工程学院,陕西西安,710021
  2. 西安平板显示中心, 陕西西安 710021
  3. 63880部队, 河南洛阳 471003
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20122703.0308
  CLC： O753.2
- Received：25 January 2012，
  
  Revised：24 February 2012，
  
  Published Online：15 June 2012，
  
  Published：15 June 2012
- 稿件说明：
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李艳菲, 张方辉, 牟曦媛, 杜红兵. 利用有机覆盖层提高OLED出光效率[J]. 液晶与显示, 2012,(3): 308-312

LI Yan-fei, ZHANG Fang-hui, MU Xi-yuan, DU Hong-bing. Improved Light Out-Coupling in Organic Light Emitting Diodes Employing Organic Capping Layer[J]. , 2012,(3): 308-312
李艳菲, 张方辉, 牟曦媛, 杜红兵. 利用有机覆盖层提高OLED出光效率[J]. 液晶与显示, 2012,(3): 308-312 DOI： 10.3788/YJYXS20122703.0308.

LI Yan-fei, ZHANG Fang-hui, MU Xi-yuan, DU Hong-bing. Improved Light Out-Coupling in Organic Light Emitting Diodes Employing Organic Capping Layer[J]. , 2012,(3): 308-312 DOI： 10.3788/YJYXS20122703.0308.

摘要

将Alq作为覆盖层真空蒸镀到玻璃基板后制作底发射有机电致发光器件(OLED)

所制备的器件结构为:Glass/Alq(

nm)/Al(15 nm)/MoO

(30 nm)/NPB(60 nm)/Alq(65 nm)/LiF(1 nm)/Al(150 nm)。通过研究器件光辐射特性曲线

可以看出覆盖层厚度的变化引起光的干涉效应的变化是导致电致发光变化的原因

广角干涉和多光束干涉之间的相互作用可以通过覆盖层的厚度来调节

并且半透明的Al膜做阳极

将覆盖层蒸镀到阳极之外玻璃基板上

半透明的铝膜和覆盖层与阴极组成微腔器件

通过改变覆盖层的厚度调节微腔的腔长

使OLED电致发光光谱的中心波长发生红移。

Abstract

A bottom emitting organic light-emitting devices was fabricated by depositing Alq as capping layer to the glass substrate.The device structure were Glass/Alq(

nm)/Al(15 nm)/MoO

(30 nm)/ NPB(60 nm)/Alq(65 nm)/LiF(1 nm)/Al(150 nm). By studying the radiation characteristics of the devices

it was found that the variation of the EL emission due to the capping layer can be entirely accounted for a change in optical interference effects.The complex interplay between wide-angle and multiple-beam interference can be controlled via the optical thickness of the dielectric capping layer on top of the cathode.Semitransparent Al film was anode.The capping layer deposited to the glass substrate formed microcavity devices with cathode.By changing the thickness of capping layer to adjust the microcavity length

the center wavelength EL spectra of OLED was red-shifted.

关键词

Keywords

references

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Huang Qiang, Walzer Karsten, Pfeiffer Martin, et al.Highly efficient top emitting organic light-emitting diodes with organic out coupling enhancement layers [J]. Appl. Phys. Lett.,2006, 88(11):113515(1-3).

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