Abstract
For illumination-grade applications, the spatial homogeneity of the white light
emitted is an important issue which is directly associated with the geometry and the
composition of the color conversion layer in phosphor-converted LEDs. In order to create
a phosphor coating of high quality surrounding the LED chip surface, an improved slurry
method with self-exposure technique was applied and investigated. The conformal phosphor
layer of self-adaptability to angular intensity distribution of LED emitting light was
realized. Plasma treatment was introduced to improve the aging performance of white LEDs
with this advanced slurry method. The effect of the self-adaptive coating on the
improvement of angular color uniformity of white LEDs was measured and
discussed.
© 2013 IEEE
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