Chip-level Ce:GdYAG ceramic phosphors with excellent chromaticity parameters for high-brightness white LED device

Development of ceramic phosphors (CPs) featuring small volume and high efficacy is crucial for miniaturization of white LEDs and their integration in solid state lighting. In this study, the chip-level 2.5x2.5mm Ce:GdYAG CPs with different thicknesses were packaged to the blue chips, and their luminous characteristics were analyzed under the different radiant flux. Notably, when thickness of the CPs was 1.4 mm, a luminous flux of 2000 lm, a correlated color temperature (CCT) of 6266K and a color rendering index (CRI) of 70 were obtained under 11.0 W blue power (1.76 W/mm(2)) excitation. Phenomenon of colorimetric drift was explained simultaneously. These results indicate that Ce:GdYAG CPs is a promising candidate for automotive lighting and high-speed rail lighting. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

This study packaged Ce:GdYAG CPs onto blue chips, and achieved satisfactory luminous characteristics with a thickness of 1.4mm and 11.0W blue power excitation, indicating the potential application of Ce:GdYAG CPs in automotive lighting and high-speed rail lighting.