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

Debasis Bera; Sergey Maslov; Jaewon Lee; Jiangeng Xue; Franky So; Paul H. Holloway

doi:10.1117/1.3642643

1 January 2011 Optimization of down-conversion phosphor films for high efficiency white organic light-emitting diodes

Debasis Bera, Sergey Maslov, Jaewon Lee, Jiangeng Xue, Franky So, Paul H. Holloway

Author Affiliations +

Journal of Photonics for Energy, Vol. 1, Issue 1, 011025 (January 2011). https://doi.org/10.1117/1.3642643

Abstract

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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Debasis Bera, Sergey Maslov, Jaewon Lee, Jiangeng Xue, Franky So, and Paul H. Holloway "Optimization of down-conversion phosphor films for high efficiency white organic light-emitting diodes," Journal of Photonics for Energy 1(1), 011025 (1 January 2011). https://doi.org/10.1117/1.3642643

Published: 1 January 2011

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KEYWORDS

Organic light emitting diodes

Magnesium

Silicon

Light emitting diodes

OLED lighting

Glasses

Particles

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