Ce3+/Mn掺杂的A3B2C3O12基荧光粉的新物相结构设计、制备与发光性能研究

制造室内照明用高品质白光LED已成为迫切需要。通过YAG黄粉或LuAG绿粉和CaAlSiN3:Eu2+红粉封装得到白光的方案存在红粉与黄(绿)粉之间由再吸收造成的效率下降，光谱缺失和由沉降速度不同造成的产品批次稳定性差等问题，成为阻碍其进入室内照明的瓶颈。开发新型蓝光LED基的单基质多色荧光粉可解决当前问题。本项目拟设计和开发Ce3+，Mn4+或Ce3+/Mn2+掺杂的{MxA3-x}B5-xCxO12(M= Mg, Ca, Sr, Ba; A= Y, Gd, Lu; B = Al, Ga, Sc; C= Si, Ge)新型荧光粉，并通过单一晶体学格位的离子替换和双(多)格位的离子协同替换的方式来调节荧光粉的基质结构，系统研究基质结构的调控对荧光粉的电子能带结构和发光性能的影响，最终构建合理的荧光粉组份-晶体结构-发光性能关系模型，从而为荧光粉的新物相设计和发光调控奠定实验和理论基础。

Manufacturing of high powder LED with high quality for indoor lighting has become an urgent need for the development of LED. The commercial high power LED is obtained by encapsulation of blue chip with YAG:Ce3+/LuAG:Ce3+ phosphor and CaAlSiN3:Eu2+ phosphor. However, re-absorption between yellow/green and red phosphors will lead to the decrease of the luminous efficiency. The lack of blue-green and deep-red light makes it difficult to meet the demand for high-quality lighting. The different settling speed of the phosphors will lead to poor product batch stability. These have become the bottleneck for indoor lighting. The current problems can be solved by developing novel single-matrix multicolor phosphors based blue LED chip. The Ce3+，Mn4+ or Ce3+-Mn2+ doped {MxA3-x}B5-xCxO12(M= Mg, Ca, Sr, Ba; A= Y, Gd, Lu; B = Al, Ga, Sc; C= Si, Ge) new phosphors will be designed and developed in this project. The crystal structural design will be realized by ion substitution of single crystallographic site and ion cooperative substitution of double (multiple) lattice. The effects of host structure changing on the electronic band structure and luminescent properties of phosphors were systematically studied. Finally, a reasonable relationship model between phosphor composition, crystal structure and luminescent properties will be constructed. These works will provide experimental and theoretical basis for new structure design and emission color tailoring of phosphors.