White organic light emitting devices with a color conversion layer |
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Authors: | Qing-jin Qi |
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Affiliation: | (1) School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, P.R. China |
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Abstract: | A white organic light emitting device (WOLED) combining the blue organic light emitting device with a red color conversion layer (CCL) is reported, which includes a fluorescent material N-(4-((E)-2-(6-((E)-4-(diphenylamino) styryl)naphtha len-2-yl)vinyl) phenyl)-N-phenylbenzenamine (N-BDAVBi) doped into 4,4′-N,N′-dicarbazole-biphenyl (CBP) as the blue light emitting layer, and the poly (2-methoxy-5-(2′-ethylhexoxy)-1,4-phenylene vinylene (MEH-PPV) as a red CCL. By optimizing the concentration of MEH-PPV in the CCL, a good white light emission is obtained, which shows that the stable CIE coordinates of (0.33, 0.34) will have a slight change when the driving voltage is increased from 6 to 11 V. The maximum brightness and current efficiency of the optimized device are 11294 cd/m2 and 6.4 cd/A, respectively. |
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