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

被引：0
|
作者：
Yan Y.-D. [1 ]
Qian M. [1 ]
Xie H.-F. [1 ]
Mu H.-C. [1 ]
机构：
[1] School of Physics, East China University of Science and Technology, Shanghai
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2021年 / 42卷 / 11期
关键词：
High-quality white light; Hybrid color-conversion layer; Organic light emitting diode(OLED);
D O I：
10.37188/CJL.20210217
中图分类号：
学科分类号：
摘要：
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 Sr2Si5N8:Eu2+ 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 Sr2Si5N8:Eu2+ 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, 82, (0.320 6, 0.369 5) and 34%, respectively, at the spin speed of 750 r/min. © 2021, Science Press. All right reserved.
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页码：1795 / 1803
页数：8
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