新型碱土硼酸盐基荧光粉的制备及其发光性能调控机理研究

Developing novel low-cost, short-afterglow, light color adjustable phosphor is very important to improve the quality of PDP, promote the development of the flat display industry and perfect people's livelihood.Rare earth doped borate is a kind of fluorescent material with great research value and development potential,due to rich structure type, good stability, simple synthesis method and matrix sensitized luminescence. In this project, typical compounds with different structure in MO-R2O3-B2O3 (M=Mg,Ca,Ba; R=Al,In,Y,Bi)system are chosen as the matrix, with different dopant ions (activator, sensitizer and charge compensation) partly substituting the M or R ion. A series of phosphors with different composition and microstructure were prepared at changable temperature and oxygen partial pressure . Their photoluminescence properties and thermal stability will be tested. The effect of phase composition, morphology, oxygen content and crystallinity on luminescent property will be studied, along with the impact of crystal structure and crystal field environment on activator-emission analyzied. Most important of all is summer rules of color modulation and methods of increasing quantum efficiency. On this basis, multi-doped and color-tunable phosphors with practical value will be prepared. The project is aiming to provide theoretical guidance for the design and fabrication of borate based PDP phosphor with high performance.

研发新型的成本低、衰减快、可见光区光色可调的荧光粉，对于制备高品质的彩色等离子平板显示器(PDP)、推动平板显示产业的发展、改善民生具有非常重要的意义。稀土掺杂的硼酸盐具有结构类型丰富、稳定性好、合成方法简单、基质敏化发光等优点，是一类极具研究价值与发展潜力的荧光材料。本项目拟选择碱土金属硼酸盐MO-R2O3-B2O3(M=Mg,Ca,Ba; R=Al,In,Y,Bi)体系中具有代表性的不同结构的化合物为基质，调节不同阳离子格位的激发剂、敏化剂和电荷补偿剂的种类及浓度，不同热处理工艺下合成不同成分和微结构的荧光粉，测试它们的发光性能和热稳定性。研究荧光粉的相组成、形貌、氧含量和结晶度对性能的影响；分析晶体结构和晶体场环境对激发剂发光的影响，研究不同掺杂离子之间的相互作用及能量传递，弄清提高量子效率的方法和调控荧光粉光色的机理，旨在为设计和制备性能优良的硼酸盐基PDP用荧光粉提供理论指导。

研发新型的成本低、衰减快、可见光区光色可调的荧光粉，对于制备高品质的彩色等离子平板显示器(PDP)、推动平板显示产业的发展、改善民生具有非常重要的意义。本项目基于成分设计、相图研究、晶体结构解析和电子结构计算，在MO-R2O3-B2O3 (M=Mg,Ca,Ba; R=Al,In,Y,Bi)体系选择代表性具有不同结构的硼酸盐及其他相关体系典型氧化物为研究对象，进行不同种类和浓度的阳离子和阴离子掺杂，合成了不同成分和微结构的荧光粉，研究了它们的发光性能和热稳定性及其影响因素。研究发现第二相、氧空位和结晶度对发光性能的影响较大；同种激活剂在不同基质中的淬灭浓度、激发光谱特征等不同；不同掺杂离子之间存在相互作用及能量传递；通过成分和能量传递的调控可以调控荧光粉的光色和量子效率。在此研究基础上，已经成功制备了多种成本低、衰减快、光色连续可调的显示与照明用荧光粉。同时，三种高效硼酸盐零淬灭紫外LED激发转白光用红色荧光粉被研发和合成。这些研究结果可为设计和制备性能优良的新型PDP和LED用荧光粉提供理论指导。