Abstract
High angular color uniformity (ACU) is strongly required in many illumination
applications. In this study, we presented the phosphor dip-transfer coating
method to realize high ACU for phosphor-converted white LEDs. The phosphor
mixture was coated on top surfaces of LED chips and formed thin and convex
phosphor layers by the dip-transfer coating. The optical simulations and experiments
were conducted for performance verifications. Both numerical and experimental
results show that the present method can obtain very high ACU. The angular
correlated color temperature (CCT) deviation reaches 378 K when the average
CCT of white LEDs is around 6200 K and it reduces to 63 K at the average CCT
of about 4000 K.
© 2013 IEEE
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