氧磷灰石结构的氮掺杂W-LEDs用荧光粉的制备及其发光机理研究

基于目前商用蓝光以及近紫外LED芯片激发的荧光粉缺乏橙红色成分，本项目拟选取具有氧磷灰石结构的基质材料，通过引入氮离子及适当的f-d离子在母体氧化物结构中双重置换，构建新型的蓝光以及近紫外激发的橙红色荧光粉。氧磷灰石结构中自由氧的存在为N离子的取代提供便利条件，进而为f-d离子的红橙光发射提供了可能的晶格环境。项目以N/O比来调控Si(O,N)4四面体网络结构为切入点，通过电荷补偿剂的选择，对氧磷灰石结构进行设计，实现微观结构变化对f-d离子辐射跃迁的调制。结合Rietveld 结构精修方法，TEM测试手段等对氮掺杂前后样品的晶体结构进行研究，进一步阐明含氮化合物发光材料的发光机理，为新型蓝光以及近紫外光激发的橙红色荧光粉的设计和研发提供新的思路和理论依据。

Based on the lack of orange-red emission component on current phosphors excited by commercial blue or near ultraviolet LED chips, in this project, the oxygen matrix materials with apatite structure will be selected to obtain novel blue and orange-red phosphors by introducing nitrogen ions and some appropriate f-d ions to make double substitution. The presence of free oxygen ions in apatite structure can provide convenient conditions for N substituted, then it will provide the possible lattice environment for f-d ions to yield the possibility of red-orange light emitting. The intent of this project is that via changing N / O ratio to adjust Si(O,N)4 network structure, then selecting charge compensation ions to design oxygen apatite structure, and changing the microstructure to achieve the modulation of f-d ions radiative transition. The crystal structure of nitrogen-doped samples will be studied by means of Rietveld structure refinement method and TEM test. And the luminescence mechanism of nitrogen-containing compounds materials will be elucidated further. The new design and the developed ideas and theories for the new orange-red phosphors excited by blue and near-ultraviolet light will be provided.