Special Section on Organic Light-Emitting Materials and Devices

Optimization of down-conversion phosphor films for high efficiency white organic light-emitting diodes

[+] Author Affiliations
Debasis Bera

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32601

Sergey Maslov, Jaewon Lee, Jiangeng Xue

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32601

Franky So

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32601

Paul H. Holloway

University of Florida, Department of Materials Science and Engineering, Gainesville, Florida 32601

J. Photon. Energy. 1(1), 011025 (December 01, 2011). doi:10.1117/1.3642643
History: Received August 02, 2010; Revised August 26, 2011; Accepted August 29, 2011; Published December 01, 2011; Online December 01, 2011
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White light emitting devices were fabricated using blue emitting organic light emitting diodes (OLEDs) and down-conversion phosphor mixtures. Three different thicknesses of yellow and mixtures of yellow and red luminescent phosphor films were prepared on separate glass slides using a silicone matrix. The down-conversion films were optimized by varying the thickness and phosphor to silicone weight ratio. The phosphor films with different thickness were coupled to an optimized blue emitting OLED with a refractive index matching gel. Optimized down-conversion phosphor layers integrated with blue OLEDs exhibited 2× enhancement of efficiency (lumens per electrical Watt) for white to that of the blue OLED. The International Commission of Illumination color coordinates and average color rendering index for this device were (0.43, 0.46) and >80, respectively.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Debasis Bera ; Sergey Maslov ; Jaewon Lee ; Jiangeng Xue ; Franky So, et al.
"Optimization of down-conversion phosphor films for high efficiency white organic light-emitting diodes", J. Photon. Energy. 1(1), 011025 (December 01, 2011). ; http://dx.doi.org/10.1117/1.3642643


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