High stability white organic light-emitting diode fabricated with the deposition of solvent premixed sources |
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Authors: | Su-Hua Yang Shih-Fong Huang Chien-Hua Chang Chi-Hung Chung |
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Affiliation: | Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, ROC |
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Abstract: | This paper presents the characteristics of high-stability white organic light-emitting diodes (WOLEDs). For the preparation of WOLEDs with a single-emission layer (EML), the source materials of MADN, BCzVB, C6, and DCJTB were solvent premixed before evaporation. The structure of the WOLEDs was ITO/NPB (50 nm)/EML (40 nm)/Bphen (30 nm)/Al (200 nm). The materials that comprised the EML for dual- and tri-wavelength WOLEDs were MADN:BCzVB:DCJTB and MADN:BCzVB:C6:DCJTB, respectively. The energy transfer between the host and the dyes influenced the luminance efficiency and chromaticity coordinates of the devices. The maximum current efficiencies were 6.34 and 6.38 cd/A for the dual- and tri-wavelength WOLEDs, respectively. The efficiency of the WOLEDs was enhanced by C6 doping, although a slight variation in the chromaticity coordinates was observed, which was resulted from variations in the applied voltage. |
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Keywords: | Electroluminescence White light Single emission layer |
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