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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 6, Iss. 12 — Dec. 1, 2010
  • pp: 645–651

Optimization of the Yellow Phosphor Concentration and Layer Thickness for Down-Conversion of Blue to White Light

Debasis Bera, Sergey Maslov, Lei Qian, Jae Soo Yoo, and Paul H. Holloway

Journal of Display Technology, Vol. 6, Issue 12, pp. 645-651 (2010)


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Abstract

A cerium-doped gadolinium-yttrium garnet yellow emitting phosphor was used to optimize the phosphor layer for down-conversion of blue light from InGaN inorganic light-emitting diode (iLED) to white. Optical, morphological and elemental characterizations of phosphor were carried out. Various amounts of the phosphor were dispersed in polymethyl methacrylate polymer (PMMA)—chlorobenzene solution. The phosphor layer thickness was optimized by varying the volume of the phosphor—PMMA mixture. Using a blue emitting (458 nm) iLED, a two times larger luminance efficacy (lm/W) was obtained from down-converted white light using a 37.5 µm thick 25 x 25 mm film prepared from 30 mg of phosphor in 500 µl of the PMMA-chlorobenzene solution.

© 2010 IEEE

Citation
Debasis Bera, Sergey Maslov, Lei Qian, Jae Soo Yoo, and Paul H. Holloway, "Optimization of the Yellow Phosphor Concentration and Layer Thickness for Down-Conversion of Blue to White Light," J. Display Technol. 6, 645-651 (2010)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-6-12-645


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