低溫燃燒法制備白光LED鋁酸鹽熒光粉發(fā)光性能研究
[Abstract]:As a new kind of solid light source, (light emitting diode,LED (Light emitting Diode) has shown great application prospect in indoor lighting, liquid crystal display and backlight, because of its advantages of energy saving, environmental protection, long life and small volume. There are three ways to obtain white LED: optical conversion, polychromatic LED chip combination and multiple quantum wells. Optical conversion is a common method at present. However, the traditional YAG:Ce3 phosphors are difficult to meet the development needs because of their low color rendering, high color temperature and other factors. Therefore, the use of near-ultraviolet chips to excite tricolor phosphors is a promising way to obtain white LED, so it is of great significance to develop high performance tricolor phosphors. At present, the main method of synthesizing phosphors is high temperature solid phase method, but this method has many disadvantages, such as long production cycle, high temperature, long time required for synthesizing materials, serious caking of products, etc. In this case, a better preparation method of phosphors is needed. Compared with the high temperature solid state method, the combustion method is more uniform than the ball milling method in the high temperature solid state method, and the control of each component is more accurate, which has the characteristics of easy and quick. Therefore, it is widely used in the synthesis of various oxides. This technique is based on the principle of redox reaction between oxidant and reducing agent igniting at low temperature. In addition, this method has the advantages of energy saving, high efficiency and high safety, and the product has good crystallinity and luminescence intensity. Therefore, the preparation of aluminate phosphors by low temperature combustion has a profound influence on the development of white LED. Aluminate matrix phosphors have been widely studied because of their high quantum efficiency, good thermal stability and chemical stability. In this paper, aluminate phosphors were prepared by low temperature combustion method, and their structure and luminescent properties were systematically characterized and analyzed. The research methods and conclusions are as follows. Firstly, the aluminate based luminescent material Sr Mg A110O17:Eu2 was prepared by low temperature combustion. By changing the amount of urea, the amount of boric acid, the initial furnace temperature and the content of activator, the effects of different synthesis conditions on the luminescent properties of the samples were studied. The structure analysis of XRD diagram shows that the single phase Sr Mg A110O17 structure can be synthesized by combustion method, and the spectral analysis results show that the Mg Al10O17:Eu2 phosphor can be effectively excited by the near ultraviolet LED chip, and its emission spectrum is distributed in the range of 430~520nm. The emission peak is located at 460 nm and is one of the blue phosphors. Secondly, in order to further improve the luminescence intensity of MMg A110O17:Eu2, MMg A110O17:Eu2 er _ 3 phosphors were prepared by co-doped Er3 with MMg A110O17:Eu2. The samples were characterized and analyzed, and the effects of Er3 doping concentration on the luminescence properties of the products were summarized. The mechanism of concentration quenching of phosphors and the sensitization mechanism of Er3 to Eu2 were explained. Finally, in order to further expand the range of phosphor emission spectrum, MMg A110O17:Eu2 _ (mn _ 2) phosphors were prepared by the same method. The structure, morphology and fluorescence properties of the phosphors were studied. On the basis of the existing mechanism, the mechanism of energy transfer in phosphors is discussed in depth, and the influence of doping of Mn2 ions on the luminescent properties of phosphors is explained. In this paper, a new method of low temperature combustion is adopted for the preparation of phosphors, and the luminescent properties of phosphors are improved by optimizing the process. Then the Sr Mg A110O17:Eu2 er 3 phosphors and the Sr Mg A110O17:Eu2 MNO 2 phosphors were prepared by the optimized technology. Keywords: combustion method; aluminate phosphor; White LED; energy transfe
【學位授予單位】:中國計量學院
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN312.8
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