Study on co-workers LED fluorescent material made great achievements

Recently learned from the HeFei University of Technology, the university research team has made important achievements in yttrium aluminum garnet LED series fluorescent material and light regulation mechanism, provide an important means to improve the performance of LED fluorescent material.

High power LED devices are widely used in home and outdoor public lighting. However, when the LED light source is used for a long time, the problem of brightness dimming and color drift occurs. School of materials science and engineering, associate professor Chen Lei and professor of research group on the issue of scientific research on the issue of the HeFei University of Technology. Through a series of experimental methods, combined with theoretical calculation, the paper gives a new explanation to the intrinsic mechanism of the spectral redshift, the intensity decrease and the thermal stability of Gd ion substitution. Because Gd larger ionic radius, the rigid structure of yttrium aluminum garnet will cause the electron cloud extrusion deformation, resulting in crystal field enhancement, the electron effective mass loss, spreading and expand the scope of electronic energy band gap decreases, which leads to the decrease of thermal stability and decrease luminous efficiency. Recently, the research results published in the British Journal of nature, the journal Science report.

According to reports, this theory is not only a scientific explanation of the Gd substituted yttrium aluminum garnet phosphor luminous phenomenon, but also for the development of new rigid structure of fluorescent material has important guiding significance. "The future can guide the development of the artificial gem crystal has a specific color, giving more bright and colorful color, such as a variety of artificial diamonds, sapphires and rubies, not only has high light transmittance and reflectance, and can be customized to a specific color bright eye-catching. Introduction of Professor Chen Lei.

For more information about LED, please click on China LED network or pay attention to WeChat public account (cnledw2013).