Abstract

An advanced phosphor conformal coating technology is proposed, good correlated color temperature (CCT) and chromaticity uniformity samples are fabricated through phosphor spray painting technology. Spray painting technology is also suitable for phosphor conformal coating of whole LED wafers. The samples of different CCTs are obtained through controlling the phosphor film thickness in the range of 6–80 μm; CCT variation of samples can be controlled in the range of ±200K. The experimental Δuv reveals that the spray painting method can obtain a much smaller CCT variation (Δuv of 1.36e3) than the conventional dispensing method (Δuv of 11.86e-3) when the light is emitted at angles from 90° to +90°, and chromaticity area uniformity is also improved significantly.

© 2013 Optical Society of America

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