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Bimolecular Emission of TCTA Under External Electric Field
- Chinese Journal of Luminescence Vol. 41, Issue 6, Pages: 700-706(2020)
- 作者机构：
1.华东理工大学 理学院, 上海 200237
2.华东理工大学 中德工学院, 上海 200237
3.华东理工大学 材料科学与工程学院, 上海 200237
- 作者简介：
- 基金信息：Innovation Training Program for College Students of East China University of Science
DOI：10.3788/fgxb20204106.0700
CLC： O482.3;TN248Received：23 March 2020，
Accepted：2020-4-23，
Published：2020-06
- 稿件说明：
移动端阅览
Li-jiang ZHANG, Rao-yuan ZHAO, Bo-xu LIU, et al. Bimolecular Emission of TCTA Under External Electric Field[J]. Chinese journal of luminescence, 2020, 41(6): 700-706.
Li-jiang ZHANG, Rao-yuan ZHAO, Bo-xu LIU, et al. Bimolecular Emission of TCTA Under External Electric Field[J]. Chinese journal of luminescence, 2020, 41(6): 700-706. DOI： 10.3788/fgxb20204106.0700.
摘要
制备了三苯胺化合物4，4'，4″-三（咔唑-9-基）三苯胺（TCTA）的单层器件ITO/MoO
3
/TCTA/LiF/Al和TCTA/TPBi双层异质结器件ITO/NPB/TCTA/TPBi/Bphen/LiF/Al，研究了TCTA的双分子发光现象。通过测试器件的光电性能和薄膜的稳态光谱，得出以下结论：（1）单层器件的电致发光光谱有425 nm和600 nm两个发光峰。与TCTA薄膜的光致发光光谱对比，可知425 nm附近的蓝色发光峰来源于TCTA单体发光，而600 nm附近的橙色发光应为TCTA二聚体electromer的发光。蓝色和橙色发光混合，使单层器件发光颜色表现为白色，对应色坐标为（0.381，0.343）。（2）TCTA/TPBi双层异质结器件的电致发光光谱为440 nm的单峰，器件的最大发光亮度为930 cd/m
2
，发光性能明显优于单层器件。结合薄膜TCTA、TPBi和TCTA/TPBi的光致发光光谱和紫外-可见光吸收光谱，可知双层器件的发光来自TCTA
+
TPBi
-
电致激基复合物。双层器件表现出良好的色稳定性，电压在6~11 V范围，CIE色坐标为（0.18±0.01，0.14±0.01）。
Abstract
In order to investigate bimolecular excited state emission of 4
4
4-tris(N-carbazolyl) triphenylamine(TCTA)
a single-layer device(ITO/MoO
3
/TCTA/LiF/Al) and a bilayer heterojunction device(ITO/NPB/TCTA/TPBi/Bphen/LiF/Al) were fabricated
respectively. Optical and electrical characteristics of devices and steady-state spectra of films were measured. The following conclusions are drawn. (1)Electroluminescent (EL) spectra of single layer devices demonstrate two emission peaks:425 nm and 600 nm. The peak at 425 nm is originated from the emission of TCTA monomer according to photoluminescent (PL) spectrum of TCTA film
and the peak centered at 600 nm is attributed to the emission from electromer. White color with 1931 CIE values of (0.381
0.343) was obtained for the single layer devices because of the superposition of blue emission peaked at 425 nm and orange emission centered at 600 nm. (2)TCTA/TPBi bilayer device exhibited EL spectra peaked at 440 nm
which is belonged to the emission of TCTA
+
TPBi
-
electroplex according to the PL and UV-Vis absorption spectra of TCTA
TPBi and TCTA/TPBi films. Meanwhile
better properties were shown in the bilayer device than those of single devices. The maximum brightness was 930 cd/m
2
and CIE coordinates were (0.18±0.01
0.14±0.01) for applied voltages varying from 6 V to 11 V.
关键词
Keywords
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