近紫外光激发三基色荧光粉可实现光谱定制及全光谱，成为白光LED扩展新兴功能性照明应用的重大共性关键技术。本项目突破常规氮/氧化物研究，在基质中引入强共价性C4-发展碳氮化物，选取RE2Si4N6C:Ce为研究对象。前期研究发现RE随La→Y→Gd的变化，发光峰呈现430→550→610nm的红移。项目拟通过调控RE种类与Ce掺杂，采用组合化学实验高通量制备蓝光→红光连续可调的RE2Si4N6C:Ce样品库，筛选出高量子效率和高荧光热稳定性的三基色荧光粉，为紫外基可调全光谱白光LED用荧光材料的选择提供有效数据；RE2Si4N6C:Ce受益于基质阳离子RE能大幅影响发光性能，成为研究发光规律的优质体系，项目拟根据大量的光谱和物性数据，建立能带结构模型，推演荧光热猝灭机理，揭示基质阳离子RE-晶体结构-发光性能的内在联系，为新型荧光材料探索从传统的“尝试法”往“智能设计”转变提供基础理论支撑

The white LED fabricated based on RGB (red/green/blue) phosphors excited by near ultraviolet chips is attainable to tailored and full spectrum, making it significant and key generic technology to extend applications in emerging functional illumination. In this project, beyond conventional research on oxy/nitrides, carbidonitrides that introduce stronger covalent C4- into host lattice of phosphors will be studied. RE2Si4N6C:Ce3+ is taken as the research object and our previous works have found that with the RE3+ change of La3+→Y3+→Gd3+, the emission peaks presented a variation of 430 nm (blue)→550 nm (green-yellow)→610 nm (orange-red). In this project, through adjusting RE3+ species and Ce3+ doping, RE2Si4N6C:Ce3+ sample libraries with successive blue→red.continuously adjustable light will be prepared through a solution combinatorial chemistry synthesis and characterization. RGB phosphors with high quantum efficiency and high fluorescence thermal stability will be screened out, providing alternatives and valid data for NUV-white LED based on RGB phosphors..Benefitting from the characteristic that the metrical cation RE3+ could affect the emission properties dramatically, RE2Si4N6C:Ce3+ is the superior system to research luminescence rule. Band structure models will be built based on large amounts of spectral and physical data. Thus the fluorescence thermal quenching mechanism of RE2Si4N6C:Ce3+ will be deduced and the internal connection among RE3+ species – crystal structures – luminescence properties will be revealed. These researches will provide basis theoretical supports for new phosphor material explorations transforming from conventional “trial-and-error” to “intelligent design”.