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Recently, the research team led by researcher Wang Yuansheng, the State Key Laboratory of Structural Chemistry of Fujian Institute of Physical Structures, has made key technological breakthroughs in high-power lighting white LED materials, and developed a new generation of Ce:YAG glass-ceramics for high-power white LED applications. .
The material has good transparency and luminous quantum efficiency of 95; LED device composed of commercial blue chip, with a current of 350 mA, has a luminous efficiency of 124 lm/W, a color temperature of 6674, a color rendering index of 70, and heat resistance. Excellent moisture resistance. After heat treatment at 150 °C for 600 hours, there is no obvious color shift. The lumen loss is only 7.6 lower than that at room temperature. The color temperature, display index and color coordinate remain basically unchanged. It is reported that relevant research results have applied for international invention patents.
High-power white LED has the advantages of energy saving and environmental protection compared with traditional lighting sources, and has become a sunrise industry. At present, the mainstream white LED devices in the world are composed of a Ce:YAG phosphor dispersed in an epoxy resin or a silica gel and then coated on a blue chip. Epoxy resin or silica gel is prone to aging under the high temperature environment generated by high-power chips, and the color turns yellow, which causes the LED to have color shift and light decay, which shortens its service life. Therefore, the development of new fluorescent materials with superior optical properties and high physical and chemical stability instead of Ce:YAG/organic matrix phosphors has become an urgent issue for the development of high-power illumination white LED technology.
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