Abstract

In this paper, we propose a thermally stable multi-color phosphor-in-glass (PiG) for chromaticity-tunable white light-emitting diodes (WLEDs). The multi-color PiG has a red, green, and blue (RGB) phosphor glass layer, which was screen-printed and co-sintered on a glass plate with a low temperature of 600°C. The WLED with ultra-compact structure was fabricated by the RGB-PiG directly bonded on a flip-chip ultraviolet (UV) LED. By controlling the weight ratio of RGB phosphors, the thickness of the RGB layer, and the weight ratio of phosphors to glass powders (PtG), the chromaticity of RGB-PiG based WLEDs can be effectively tuned with high color quality. With the RGB ratio of 232, the RGB thickness of 75 μm, and the PtG ratio of 21, the RGB-PiG based WLED achieves a natural white light with a luminous efficacy (LE) of 27.8 lm/W, a correlated color temperature of 4245 K, and a color rendering index of 92.6 at the current of 350 mA. The LE losses of the RGB-PiG based and RGB phosphor-in-silicone based WLEDs are 4.7% and 14.6% after the aging tests of 1000 h at 100°C, respectively. The results demonstrate that the multi-color PiG is a promising converter for UV-excited WLEDs.

© 2017 Optical Society of America

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