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White light emitting devices based on organic multilayer structure

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Authors
Lim, J. T.; Ahn, Y. J.; Kang, G. W.; Lee, Changhee
Issue Date
2002
Publisher
Elsevier
Citation
Curr. Appl. Phys. 2 (2002) 295
Keywords
Organic electroluminescence devicesWhite-light-emitting devicesZn(BTZ)2DCM2
Abstract
We report an efficient white-light-emitting devices using vacuum-deposited film of a hole-transporting layer of 4,4′bis[N-(1-napthyl)-N-phenyl-amino]-biphenyl (α-NPD), a bluish-green emitting layer of bis[2-(2-hydroxyphenyl)benzothiazolate] zinc, a Zn(BTZ)2, Zn(BTZ)2 doped with a red fluorescent dye of 4-dicyanomethylene-2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i, j]quinolizin-8-yl)vinyl]-4H-pyran (DCM2), and an electron-transporting layer of tris(8-hydroxyquinoline) aluminum (Alq3). The incomplete energy transfer from Zn(BTZ)2 to DCM2 results in the emission of two complementary colors (blue and orange). Controlling the thickness of a Zn(BTZ)2 layer which acts as a bluish-green emitter and a hole blocking layer and the concentration of DCM2 enables tailoring of the spectral output of the device to have a balanced white emission. A device with the structure of ITO/α-NPD (50 nm)/Zn(BTZ)2 (4 nm)/Zn(BTZ)2:DCM2 (10 nm, 0.8%)/Alq3 (30 nm)/LiF(0.5 nm)/Al shows an external quantum efficiency (QE) of about 0.5%, a luminous efficiency of 0.27 lm/W, and the CIE chromaticity coordinates of (0.36, 0.33) at luminance 100 cd/m2.
ISSN
1567-1739
Language
English
URI
http://hdl.handle.net/10371/13787
DOI
https://doi.org/10.1016/S1567-1739(02)00112-8
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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