Abstract
High-efficiency white light-emitting diodes (LEDS) with superior spatial
color homogeneity (SCH) have been investigated. In this paper, a new method
of packaging of phosphor-converted white LEDs (pc-WLEDs) that employs a self-exposure
technique as well as a remote phosphor configuration is presented. It is suggested
that this remote phosphor configuration reduces the backscattering of emission
light of LEDs as well as the operating temperature of the phosphor, which
improve the luminous efficiency and reliability of pc-WLEDs. The slurry method
with self-exposure process was applied to achieve a self-adaptive remote phosphor
coating layer surrounding the LED chips which could map the angular intensity
distribution of blue light emitted from LED chips every direction and therefore
improve the spatial color homogeneity. The experimental results show that
pc-WLEDs with self-adaptive remote phosphor coating has remarkable advantages
over conventional dispensing coating and conformal coating in terms of efficiency
and color homogeneity.
© 2014 IEEE
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