Preparation And Luminescence Improvement Of Blue Phosphor BaMgAl₁₀O₁₇:Eu²⁺ For White-LED

White LED is generally recognized as the new generation of source of light because of such features as long service life,high luminous efficiency, energy-conservation and environmental protection,and it will have a wide market and good prospect of development.This thesis offers a detailed and comprehensive explanation of the basic principle and study development of White LED Light,luminous mechanism,classification and preparative method of phosphorescent powder.Based on what is discussed above, research is made on the study situation and existing problems of the biue phosphor-rescent powder.The blue phosphorescent powder is based on the materials of BaMgAl10O17:Eu2+synthesized by traditional solid-state reaction.And the detailed study is made on the preparative method and structure decoration of blue phosphor-rescent powder,with the purpose of improving the luminous efficiency of it once activated by near ultraviolet excitation.1, H3BO3、BaF2、AlF3and MgF2were chosen as fluxes agents, whose influences on phase purity, particle morphology and luminescent properties of blue phosphors were investigated. The results indicated that samples fluxed by H3BO3are prone to formation of pure phase than the ones fluxed by BaF2AlF3,and MgF2. Particle size and particle shape are also influenced by using different fluxes. Luminescence intensities of the prepared phosphors are also decided by all kinds of fluxes. Finally, the highest photoluminescence intensity is achieved when BaF2was used as flux.2, H3BO3+BaF2、H3BO3+AlF3and BaF2+AlF3were chosen as Composite fluxes, whose influences on phase purity, particle morphology and luminescent properties of blue phosphors were investigated. The results indicated that samples fluxed by H3BO3+BaF2are better performance to formation of pure phase、particle size and particle shape and luminescence intensities than the ones fluxed by H3BO3+AIF3and BaF2+AIF3, the performance higher than that of Commercial blue phosphor of Suntory new mateial company.3, When dopped the appropriate amounts of Li2CO3and Si3N4, SEM imagines demonstrated that the addition of doping agent,in the process of prepared phosphor was benefit to the particles size and morphology of BaMgAl10O17:Eu2+phosphor. Photoluminescence measurements under VUV excitation indicated that the luminescent intensity of the phosphor enhanced by adding the doping agent. The addition of the doping agent can not only enhance the luminescence efficiency and improve the stability, but also control the morphology and grain size of the phosphor. The replacement of Ba2+by Li+and Al-0by Si-N could generate traps which results in slightly longer decay time.The result of the experiment shows that the luminous efficiency of the BaMg-Al10O17:Eu2+blue phosphorescent powder activated by near ultraviolet excitation can be improved by the above ways,which proves that BAM blue phosphor is a very promising blue phosphorescent powder for LED.