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 <i>µ</i>m thick 25 x 25 mm film prepared from 30 mg of phosphor in 500 <i>µ</i>l of the PMMA-chlorobenzene solution.
© 2010 IEEE
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