Major research achievements in LED fluorescence materials

Recently, HeFei University of Technology has learned that the research team of the school has made important achievements in the yttrium aluminum garnet LED fluorescent materials and its light and color regulation mechanism, and has provided an important means to further improve the performance of LED fluorescent materials.

High power LED devices are widely used in home and outdoor public lighting. However, when LED lighting source is used for a long time, it will appear dimming and color drift. Chen Lei, associate professor of materials science and engineering, HeFei University of Technology, and Professor Jiang Yang's research group launched research on this issue. Through a series of experimental methods and theoretical calculations, they provide a new explanation for the intrinsic mechanism of red shift, intensity drop and thermal stability deterioration caused by Gd ion substitution. Due to the large radius of Gd ions, the electronic cloud extrusion deformation in yttrium aluminum garnet rigid structure will cause crystal field enhancement, electron effective mass reduction, electron spreading level range widening and band gap reduction, leading to the decrease of luminous efficiency and the decrease of thermal stability. Recently, this research is published in the scientific journal of the British Journal of nature.

It is reported that this theory not only scientifically explains the luminescence phenomenon of Yttrium Aluminum Garnet Phosphors after Gd substitution, but also has important guiding significance for developing new rigid structure fluorescent materials. "The future can guide the development of artificial sapphire crystals with special color and give more colorful colors, such as all kinds of synthetic diamonds, sapphires and rubies. It not only presents high transmittance and reflective rate, but also can make specific colors to make them dazzling." Professor Chen Lei introduced.

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