基于太阳能电池增效的红光转换分析-微电子学与固体电子学专业论文.docxVIP

II II Abstract With the emergence of energy crisis and environmental pollution，solar energy has received considerable attention because it is a green, safe and inexhaustible energy. Solar cells will be widely used in many fields. Photoluminescent materials could covert the sunlight into the responding region of solar cell. Those materials could change the current situation of low efficiency of solar cells, increasing the ulitility of sunlight. In this paper, CaAl12O19:Mn4+,Ge4+ which can convert ultraviolet light (UV), violet light and blue light to red light have been prepared by a combustion method. CaAl12O19:Mn4+,Cr3+ which could convert ultraviolet light (UV), violet light, blue light and green light to red light have been prepared by solid-state reaction method accompanying thermal decomposition of nitrate assisted with wet chemical mixing route. LiYF4:Er3+,Ho3+, a new kind cooperated down and up-conversion material, which can convert blue light, green light and infrared light to red light, have been prepared by a method of co-precipitation. Since most of the solar cells couldn’t absorb the ultraviolet, violet and blue light efficiently, we choose CaAl12O19: Mn4+ phosphor to convert the light of high energy into 657nm red emission. With the introduction of Ge4+ and the annealing treatment, the red emission intensity in CaAl12O19:Mn4+ phosphor increases by 81% under 330 nm UVA excitation. The concentration of Ge4+ and annealing temperature has been optimized in our experiment. And the luminescence mechanism has been discussed. CaAl12O19:Mn4+,Cr3+ which can not only convert ultraviolet violet and blue light to red light, but also convert green light to red light, has been investigated. The concentration of Mn4+ and Cr3+ has optimized in our experiment. And the luminescence mechanism has been also discussed. 52% sunlight is in the infrared region. Only a little of infrared light could be absorbed by most of solar cells. At present，upconversion materials can conve