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上海大学嘉定校区材料系 上海,201800
纸质出版日期:2000-2-29,
收稿日期:1999-7-12,
修回日期:1999-10-19,
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张步新, 朱文清, 赵伟明, 蒋雪茵, 张志林, 许少鸿. 白色有机薄膜电致发光[J]. 发光学报, 2000,21(1): 74-77
ZHANG Bu-xin, ZHU Wen-qing, ZHAO Wei-ming, JIANG Xue-yin, ZHANG Zhi-lin, XU Shao-hong. White Emitting Organic Thin Film Electroluminescence[J]. Chinese Journal of Luminescence, 2000,21(1): 74-77
1987年柯达公司C. W. Tang 发表的有机薄膜电致发光 因其在平板显示技术中的巨大应用前景而成为当前研究的热点。白色发光因是实现全彩色平板显示的重要方案之一
而倍受人们的关注。
White color emitting organic electroluminescence (EL) device is a convenient means to realize full-color display because the three necessary primary colors could be obtained by color filters from white back light. In this paper a new three-layer device is presented. We used N
N'-bis-(lnaphhyl)-N
N'-diphenyl-1
1'-biphenyl-4
4'-diamine (NPB) as the hole transport layer
Alq as the electron transport layer
CuPc as the buffer layer
and TPBi as the blocking layer inserted between NPB and Alq.The 5
6
11
12-tetraphenyltetracene (Rubrene) as dopant was doped into the blocking layer.It was thought initially that if energy transfer existed between the host and dopant in photoluminescence (PL) of NPB doped with Rubrene
white emission might be obtained in a device such as ITO/CuPc/NPB:Rubrene/TPBi/Alq/Mg:Ag. Thus the PL of NPB:Rubrene system excited by NPB absorption band with different dopant concentrations were investigated in advance. There are two bands in the PL spectra
the blue one is emitted by NPB and the yellow one is by Rubrene. The ratio of these two bands can be adjusted by changing the Rubrene concentration. This shows that energy transfer does occur from NPB to Rubrene. Time-resolved spectra of this system
which will be given in another paper
confirm further that the energy transfer exists and is quite effective. White emission can be produced by adjusting the concentration of Rubrene in PL. However
devices of structure ITO/CuPc/NPB:Rubrene/TPBi/Alq/Mg:Ag were made according to these results with TPBi as the blocking layer
white emission can not be obtained by changing the Rubrene concentration.For another device of structure ITO/CuPc/NPB/TPBi:Rubrene/Alq/Mg:Ag
with a blocking layer TPBi doped by Rubrene concentration 1.5% inserted between NPB and Alq
white emission can be obtained. The highest luminance and maximum efficiency are 8635cd/m
2
and 1.39lm/W respectively
CIE coordinate
x
=0.31
y
=0.32. The color of the emitted light can still be optimized by adjusting the relative thickness of the relevant layers and dopant concentration.The electroluminescence mechanism of two kinds of cells was discussed.
白色显示有机薄膜电致发光器件
white displaysorganic thin filmelectroluminescent devices
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