Abstract

This investigation demonstrates a novel light-emitting system with an array of blue light-emitting diodes (LEDs). Unlike a conventional lighting system that is constructed from white LEDs, the proposed planar lighting system uses blue LEDs to excite a YAG : Ce<sup>3+</sup> yellow phosphor film remotely, yielding a high lumen efficiency with uniform and planar light-emission. The phosphor film herein acts as a wavelength converter and a light diffuser simultaneously. The optical properties of the proposed lighting system, angular color deviation and light-emitting uniformity, are studied. Eventually, a high lumen efficiency (73.0 lm/W) and thin lighting module (7.5 mm-thick) was demonstrated without the use of any conventional diffuser plate or light guiding plate (LGP). A low color deviation (Δ<i>u'</i><i>v'</i>=0.025) and a high light-emitting uniformity (U<sub>niformity</sub>=82% were achieved. Hence, the proposed lighting system exhibited superior optical performance using a compact module. Index Terms—Angular color deviation, indium gallium nitride (InGaN), light-emitting diodes (LEDs), phosphor, remote phosphor, yttrium aluminum garnet (YAG).

© 2011 IEEE

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