High-quality White Light Emission by Blue-green Organic Light Emitting Devices with Hybrid Color-conversion Layer

Yi-dong YAN; Min QIAN; Hai-fen XIE; Hai-chuan MU

doi:10.37188/CJL.20210217

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High-quality White Light Emission by Blue-green Organic Light Emitting Devices with Hybrid Color-conversion Layer

Device Fabrication and Physics | 更新时间：2021-11-23

- High-quality White Light Emission by Blue-green Organic Light Emitting Devices with Hybrid Color-conversion Layer
  增强出版
- Chinese Journal of Luminescence Vol. 42, Issue 11, Pages: 1795-1803(2021)
- 作者机构：
  
  华东理工大学　物理学院，上海　200237
- 作者简介：
- 基金信息：
- DOI：10.37188/CJL.20210217
  CLC： O482.31
- Published：01 November 2021，
  
  Received：22 June 2021，
  
  Revised：10 July 2021，
扫描看全文
Yi-dong YAN, Min QIAN, Hai-fen XIE, et al. High-quality White Light Emission by Blue-green Organic Light Emitting Devices with Hybrid Color-conversion Layer. [J]. Chinese Journal of Luminescence 42(11):1795-1803(2021)
DOI：

Yi-dong YAN, Min QIAN, Hai-fen XIE, et al. High-quality White Light Emission by Blue-green Organic Light Emitting Devices with Hybrid Color-conversion Layer. [J]. Chinese Journal of Luminescence 42(11):1795-1803(2021) DOI： 10.37188/CJL.20210217.

摘要

采用(E)-4-二腈亚甲基-2-叔丁基-6-(1

7-四甲基久洛尼定乙烯基)吡喃(4-(Dicyanomethylene)-2-tert-butyl-6-(1

7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran

DCJTB)分散到PMMA中作为色转换膜(CCL)，分别结合纯蓝光和蓝绿光器件为激发光源制备得到了白光有机发光器件(WOLED)。研究结果表明，使用发光层结构为mCP∶Firpic(10 nm)/ mCP(1 nm)/mCP∶4CzIPN(1.5 nm)的蓝绿光器件作为激发光源时，制备得到的WOLED性能明显优于使用纯蓝光进行激发的WOLED性能，其最大电流效率(CE) 为15.44 cd/A、显色指数(CRI) 77、色坐标(0.320 6

0.369 5)、色转换效率(CCE) 52%。为了进一步展宽电致发光(EL)光谱并提高CRI，将DCJTB和无机荧光粉Sr

∶Eu

按一定比例混合后分散到PMMA中，制备得到复合CCL并将其以不同的速率旋涂到蓝绿光器件背面。结果表明，掺入Sr

∶Eu

后白光OLED的CRI获得明显改善，这是由于通过对CCL厚度的调控，使得掺杂后CCL的红光峰逐渐红移从而引起EL光谱更进一步地展宽；并且当旋涂速率为750 r/min时，获得的WOLED具备最佳的CCL厚度及EL性能，其最大CE、CRI、色坐标、CCE分别达到11.29 cd/A、82、(0.320 6

0.369 5)和34%。

Abstract

The white organic light emitting diodes(OLEDs) were fabricated by employing DCJTB dispersed in PMMA as a color conversion layer(CCL) and pure blue and blue-green OLEDs as excitation sources. The results showed that the electroluminescence(EL) performance of the white OLED(WOLED) employing the blue-green OLEDs as the excitation source with the emitting layer structure of mCP∶Firpic(10 nm)/mCP(1 nm)/mCP∶4CzIPN(1.5 nm) was significantly better than that of the WOLEDs with the pure blue excitation OLEDs

which demonstrated maximum current efficiency(CE) and color rendering index(CRI)

CIE coordinate and color conversion efficiency(CCE) of 15.44 cd/A and 77

(0.320 6

0.369 5) and 52%

respectively. In order to further broaden the EL spectrum and increase the CRI

DCJTB and inorganic phosphor Sr

∶Eu

were mixed in a certain ratio and dispersed in PMMA to fabricate a hybrid material for CCL

which was spin-coated on the backsides of the blue-green OLEDs at various speed. The results showed that the dopant Sr

∶Eu

in the CCL will dramatically improve the CRI of the WOLED due to the broadening of the EL spectrum resulted from the red-shifting of the PL spectrum of doped CCL

via

the modulation of the CCL thickness. The WOLEDs with the optimal doped CCL thickness reveal optimal EL performance with the respective maximum CE

CRI

CIE coordinate and CCE of 11.29 cd/A

(0.320 6

0.369 5) and 34%

respectively

at the spin speed of 750 r/min.

关键词

有机发光器件高质量白光复合色转换膜

Keywords

organic light emitting diode(OLED)high-quality white lighthybrid color-conversion layer

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Related Author

Yi-dong YAN

Min QIAN

Hai-fen XIE

Hai-chuan MU

XU Xin-hua

HAN Ming-chuan

YIN Shou-gen

Related Institution

Department of Physics， School of Science， East China University of Science and Technology

School of Materials Science and Engineering, Tianjin University

Institute of Material Physics, Tianjin Institute of Technology

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