Fujian-Taiwan cooperation in the development of red phosphor for white LEDs

     The reporter learned from the Fujian Institute of Material Structure of the Chinese Academy of Sciences that with the support of the Outstanding Youth Fund of the National Foundation Committee and the Joint Fund for Promoting Cross-Strait Scientific and Technological Cooperation, the Innovation International Team of the Chinese Academy of Sciences, and major special projects in Fujian Province, the Chen Xueyuan Research Group cooperated with the Liu Ruxi Research Group of Taiwan University to successfully prepare a new high-efficiency warm white LED with red phosphor for the first time using the 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 light chips to excite YAG: Ce3 + yellow phosphor, but the red light component in the emission spectrum of this device is insufficient, and it is difficult to obtain warm white light devices with low color temperature and high color rendering index, which limits its application in indoor general lighting. In order to solve this problem, appropriate red phosphors need to be added to the device to supplement the red components, and high-performance, low-cost red phosphors are still very lacking.

The red phosphor successfully prepared by the research team is suitable for excitation of blue light chips, with a luminous efficiency of 98% at room temperature, which is better than most existing red phosphors and has good fluorescence thermal stability. At the same time, the developed ion exchange preparation method has a simple process, can be prepared at room temperature and normal pressure, and the raw materials are cheap, so it has good market application prospects. The research has been published online in the internationally renowned journal Nature Communications, and 2 Chinese invention patents have been applied for.