磷酸盐单相白光发射荧光粉制备及发光性能研究

摘要：白光LED作为第四代光源，具有节能、环保、寿命长等优点。LED实现白光LED实现，需要依靠荧光实现光谱转换。单相白光发射荧光粉，因高度的统一性，即具有在一种物质中实现白光发射的独特优势，而备受关注。本文采用高温固相法制备,以Eu2+,Mn2+共掺引入到Ca9Al(PO4)7基质材料的方式，制备出单相白光发射荧光粉Ca9Al(PO4)7:Eu2+,Mn2+。通过使用XRD，荧光光谱仪及热稳定、量子效率附件及量子学计算等方式，表征和研究了Ca9Al(PO4)7:Eu2+,Mn2+的结构、发光性能及Ca9Al(PO4)7:Eu2+,Mn2+中Eu2+离子和Mn2+离子发生能量传递的方式。最终通过浓度优化实现白光调制，制备出Ca9Al(PO4)7:Eu2+,Mn2+单相白光发射荧光粉，主要的研究内容如下：74638

（1）Eu2+离子单独掺杂的Ca9Al(PO4)7荧光粉的制备及发光性能研究：通过Eu2+离子掺杂浓度的优化，调控Ca9Al(PO4)7:Eu2+荧光粉的发光强度。随着Eu2+离子掺杂浓度的逐渐增加，Ca9Al(PO4)7:Eu2+荧光粉的蓝光发光强度（327nm激发下的425nm处的发射）逐渐增强。当Eu2+离子的掺杂浓度达到1%时，Ca9Al(PO4)7:Eu2+荧光粉的发光强度达到最高，表明Eu2+离子的最佳掺杂浓度为1%。

（2）Eu2+离子、Mn2+离子共掺Ca9Al(PO4)7荧光粉的制备及发光性能研究：在Eu2+最佳掺杂浓度下，通过Mn2+离子掺杂浓度的优化，调控Ca9Al(PO4)7:Eu2+,Mn2+荧光粉，使其产生最佳白光发射。研究及了发光性能及Ca9Al(PO4)7:Eu2+,Mn2+中Eu2+离子和Mn2+离子发生能量传递的方式。最后，通过荧光热稳定、量子效率及色坐标的测试及表征，Ca9Al(PO4)7:0。01Eu2+,0。07Mn2+荧光粉的光谱性能，探讨了其在白光LED中应用价值。

毕业论文关键词：白光发光二极管；单相白光发射荧光粉；共掺；能量传递；光谱调控

Preparation and Luminescent Properties of Phosphate Single - phase White Light - emitting Phosphor

Abstract: White LED as the fourth generation of light, with energy saving, environmental protection, long life and other advantages。 LED to achieve white LED to achieve, need to rely on fluorescence to achieve spectral conversion。 Single-phase white light emission phosphor, due to the high degree of uniformity, that is, in a substance to achieve the unique advantages of white light emission, and much concern。 In this paper, Ca9Al(PO4)7 : Eu2+ and Mn2+ were prepared by co-blending Eu2+ and Mn2+ into Ca9Al (PO4)7 matrix materials by high temperature solid phase method。 The structure and luminescence properties of Ca9Al(PO4)7 : Eu2+, Mn2+ and the Eu2+ in Ca9Al(PO4)7 : Eu2+ and Mn2+ were characterized and studied by using XRD, fluorescence spectroscopy and thermal stability, quantum efficiency attachment and quantum calculation。 Ions and Mn2+ ions in the way of energy transfer。 The main research contents of Ca9Al(PO4)7 : Eu2+, Mn2+ single phase white light emission phosphor were prepared by white light modulation。

(1)The luminescence intensity of Ca9Al(PO4)7 : Eu2+ phosphors was controlled by the optimization of Eu2+ ion doping concentration。 With the increase of Eu2+ ion doping concentration, the blue luminescence intensity of Ca9Al(PO4)7 : Eu2+ phosphor (the emission at 425nm under 327nm excitation) is gradually enhanced。 When the doping concentration of Eu2+ ions reaches 1%, the luminescence intensity of Ca9Al(PO4)7: Eu2+phosphors is the highest, indicating that the optimal doping concentration of Eu2+ ions is 1%。

(2)Under the optimum doping concentration of Eu2+, Ca9Al(PO4)7 : Eu2+, Mn2+ phosphors were controlled by Mn2+ ion doping concentration to produce the best white light emission。 With the increase of Mn2+ ion doping concentration, the luminescence intensity of Eu2+ decreases。 When the doping concentration of Mn2+ is 7%, Ca9Al (PO4)7 : Eu2+, Mn2+ phosphors produce the best white light, indicating that Ca9Al (PO4)7 : Eu2+, Mn2+ phosphors produce the best white light Eu2+ : Mn2+ , i。e。 Ca9Al(PO4)7 : 0。01Eu2+, 0。07Mn2+。磷酸盐单相白光发射荧光粉制备及发光性能研究:http://www.youerw.com/cailiao/lunwen_85285.html