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- Title
The Investigation on Color Purity of Blue Organic Light-Emitting Diodes (BOLED) by Hole-Blocking Layer.
- Authors
Kan-Lin Chen; Chien-Jung Huang; Wen-Ray Chen; Chih-Chieh Kang; Wen-How Lan; Yu-Chen Lee
- Abstract
Organic light-emitting diodes (OLEDs) with triple hole-blocking layer (THBL) structure, which consist of 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline (BCP), 4,4'-bis(2,2'diphenyl vinil)-1,1'-biphenyl (DPVBi), and (4,4'-N,N'-dicarbazole)biphenyl (CBP), have been fabricated. Regardless of applied voltage variation, the luminous efficiency of the OLEDs with THBL structure was increased by 41% as compared with the dual hole-blocking layer (DHBL) structure. The CIE coordinates of (0.157, 0.111) of device with THBL structure are close to pure blue emission than that of other devices of DHBL. There is a coordinate with the slight shift of ±Δx,y = (0.001, 0.008) for the device with THBL structure during the applied voltage of 6-9V. The results indicate that the excitons can be effectively confined in the emitting layer of device, leading to an enhancement of luminance efficiency and more stable coordinate.
- Subjects
ORGANIC light emitting diodes; PHENANTHROLINE; ELECTRIC potential; COORDINATES; BIPHENYL compounds; MICROFABRICATION
- Publication
International Journal of Photoenergy, 2013, p1
- ISSN
1110-662X
- Publication type
Article
- DOI
10.1155/2013/878537