Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance

TANG Xiao-qing; YU Jun-sheng; LI Lu; MA Tao; WEN Wen; JIANG Ya-dong

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Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance

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- Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance
- Chinese Journal of Luminescence Vol. 29, Issue 2, Pages: 253-258(2008)
- 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,61005
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN383.1;TN873.3
- Received：21 August 2007，
  
  Revised：21 September 2007，
  
  Published：20 March 2008
- 稿件说明：
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唐晓庆, 于军胜, 李璐, 马涛, 文雯, 蒋亚东. 超薄层BCP对有机电致发光器件性能的影响[J]. 发光学报, 2008,29(2): 253-258

TANG Xiao-qing, YU Jun-sheng, LI Lu, MA Tao, WEN Wen, JIANG Ya-dong. Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance[J]. Chinese Journal of Luminescence, 2008,29(2): 253-258
唐晓庆, 于军胜, 李璐, 马涛, 文雯, 蒋亚东. 超薄层BCP对有机电致发光器件性能的影响[J]. 发光学报, 2008,29(2): 253-258 DOI：

TANG Xiao-qing, YU Jun-sheng, LI Lu, MA Tao, WEN Wen, JIANG Ya-dong. Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance[J]. Chinese Journal of Luminescence, 2008,29(2): 253-258 DOI：

摘要

采用真空热蒸镀的方法

在常规的双层器件结构的基础上

设计了三层双异质结有机电致发光器件(OLED):indium-tin oxide(ITO)/N

N'-diphenyl-N

N'-bis(1-naphthyl)(1

1'-biphenyl)-4

4'-diamine(NPB)/2

9-dimethyl-4

7-diphenyl-1

10-phenan throline(BCP)/8-hydroxyquinoline aluminum(Alq

)/Mg:Ag。通过对器件的电致发光(EL)光谱及器件性能的表征

研究了不同超薄层BCP的厚度对OLED器件性能的影响。结果表明

当超薄层BCP的厚度从0.1nm逐渐增加到4.0nm时

器件的EL光谱实现了绿光→蓝绿光→蓝光的变化;BCP层有效地调节了载流子的复合区域

改变了器件的发光颜色

提高了器件的亮度和发光效率。

Abstract

Organic light-emitting diodes (OLEDs) have been intensively studied in the past several years due to their unique image quality and potential commercial application in flat-panel displays. Since Tang and Van Slyke reported the first double-layer green thin-film OLED with high brightness and low driving voltage

the OLEDs have demonstrated their good prospect around the world for this new display technology. The distingui-shed characteristics of OLEDs for displays include high efficiency

wide viewing angle

fast response time

low power on consumption and potentially low cost. In addition

their low processing temperatures

and thus versatility in substrates

render them suitable for some novel display applications

such as flexible displays. Over the past decade

the OLED display technology has made rapid progress; the major technical issues associated with these advanced OLED structures in general are how to design their optical structures and how to choose suitable materials with required electrical and optical properties. To achieve further advances in the brightness

power efficiency and the color purity of the electroluminescent spectrum of OLEDs

it will be necessary to develop new materials and design suitable device structures with long-term stability and lifetime. The mechanism for electroluminescent (EL) phenomenon involves in the injection of holes from anode and electrons from cathode under forward bias voltage

then the hole-electrons from excitons

and light emission appears through the radiative recombination of excitons. In order to obtain optimal luminance and power efficiency

organic electroluminescence requires the effective injection and recombination of the electrons and holes

and the injection balance of the electron and hole. Therefore

the reasonable device structures and the choice of the function materials of the OLEDs play the important role to improve the brightness

power efficiency and the device's stability.Based on conventional two-layer devices

the double heterostructure three-layer OLEDs with a structure of indium-tin oxide (ITO)/N

N'-diphenyl-N

N'-bis(1-naphthyl)(1

1'-biphenyl)-4

4'-diamine (NPB)/2

9-dimethyl-4

7-diphenyl-1

10-phenan throline (BCP)/8-hydroxyquinoline aluminum (Alq

)/Mg:Ag have been fabricated using vacuum deposition method. Through characterizing the electroluminescence (EL) spectrum and the performance of the devices

the influence of different thickness from the BCP ultrathin film on the performance of OLEDs have been investigated. The results showed that when the thickness of BCP ultrathin film gradually ranges from 0.1 nm to 4.0 nm

the EL spectrum of the OLEDs shift from green to greenish-blue

and at last the device is absolutely blue-emitting from the hole transport layer of NPB. The ultrathin film of the BCP plays the role as not only effectively regulating the recombination region of charge carriers as well as EL spectrum

but also enhancing the brightness and luminance efficiency of OLEDs.

关键词

Keywords

references

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