White LEDs were developed in cooperation with red phosphors.
The reporter learned from the Fujian Institute of Physical Education of the Chinese Academy of Sciences that with the support of the National Fund Committee Outstanding Youth Fund and the Cross-Strait Science and Technology Cooperation Joint Fund, the Chinese Academy of Sciences Innovation International Team and the Fujian Province Major Special Project, the Chen Xueyuan Research Group and the University of Taiwan Liu Ruyi Research The group cooperated for the first time to successfully prepare a new type of high-efficiency warm white light led red light phosphor by ion exchange method.
The reporter learned from the Fujian Institute of Physical Education of the Chinese Academy of Sciences that with the support of the National Fund Committee Outstanding Youth Fund and the Cross-Strait Science and Technology Cooperation Joint Fund, the Chinese Academy of Sciences Innovation International Team and the Fujian Province Major Special Project, the Chen Xueyuan Research Group and the University of Taiwan Liu Ruyi Research The group cooperated for the first time to successfully prepare a new type of high-efficiency warm white light led red light phosphor by ion exchange method.
It is reported that white LEDs have become the next generation of lighting devices due to their energy saving, environmental protection and long life. At present, commercial white LEDs mainly use blue chip to excite YAG:Ce3+ yellow phosphors, but the red light component of the emission spectrum of such devices is insufficient, and it is difficult to obtain warm white light devices with low color temperature and high color rendering index. Its application in indoor general illumination. In order to solve this problem, it is necessary to add an appropriate red phosphor to the device to supplement the red component, and the high-performance, low-cost red phosphor is still lacking.
The red phosphors successfully prepared by the research team are suitable for excitation of blue light chips, and the luminous efficiency at room temperature is 98%, which is superior to most existing red phosphors and has good fluorescence thermal stability. At the same time, the ion exchange preparation method developed is simple in process, can be prepared at room temperature and normal pressure, and the raw material price is cheap, so it has a good market application prospect. The research has been published online in the internationally renowned journal Nature Communications and has applied for two Chinese invention patents.
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