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K. Saxena,Gyanendra Singh,B. Thallapaka,D.S. Mehta 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.3
A single-emissive fluorescent layer co-doped with red and blue phosphorescent dyes in a host [4, 4, bis-9 carbozyl-biphenyl](CBP) was used to fabricate white organic light-emitting devices (WOLEDs). The electroluminescent spectrum of thegenerated white light was observed to have two spectral peaks at ∼495 and ∼590 nm and a dip at ∼536 nm, with differentthicknesses of the emissive layer (EML). By optimizing the ratio of the dopants in the EML, the ratio of the maximumintensity of the two spectral peaks was brought to unity. The Commission Internationale de l’Eclairage (CIE) coordinatesand correlated color temperature of the fabricated device were calculated, and the results are reported herein. No significantchange in the spectral shape of the emission spectra and the CIE coordinates were obtained when the applied voltages werevaried. It is easier to fabricate WOLEDs with a single EML as compared with their multilayer counterparts.