Lighting object-based nondoped-type white organic light-emitting diode with N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′ -benzidine)-4, 4′ -diamine as the chromaticity-tuning layer
Document Type
Article
Publication Date
12-15-2007
Abstract
We demonstrate a nondoped white organic light-emitting diode in which the blue, green, and red emissions are generated from 4,4′-bis(2,2′- diphenylvinyl)-1,1′-biphenyl, tris(8-hydroxyquinoline)aluminum, and a submonolayer of 4-(dieyanomethylene)-2-t-butyl-6-(1,1,7,7- tetramethyl-julolidyl 9-enyl)-4H-pyran layers, respectively. A thin layer of N,N′-diphenyl-N, N′-bis(1-naphthyl)(1,1′-benzidine)-4,4′-diamine (NPB), which differed from the traditional hole-transporting layer, was introduced into the device. The thickness of this thin NPB layer was changed to tune the chromaticity and optimize the white color quality. The white device with a 3 nm chromaticity-tuning NPB layer gives the Commission Internationale de l'Eclairage-1931 xy coordinate of (0.327, 0.336), a color rendering index of 90.2, a maximum luminance of 19,096 cd/m2, and a maximum current efficiency of 4.12 cd/A. The electroluminescence mechanism of the white device was also discussed. © 2007 Optical Society of America.
Publication Source (Journal or Book title)
Optics Letters
First Page
3537
Last Page
3539
Recommended Citation
Zhu, J., Li, W., Su, Z., Chu, B., Han, L., Yang, D., Bi, D., Li, B., Hu, Z., Zhang, Z., & Tsuboi, T. (2007). Lighting object-based nondoped-type white organic light-emitting diode with N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′ -benzidine)-4, 4′ -diamine as the chromaticity-tuning layer. Optics Letters, 32 (24), 3537-3539. https://doi.org/10.1364/OL.32.003537