氮(氧)化物农用转光材料的合成及性能调控研究

This project is presented based on these drawbacks that the current available agricultural light-converting materials is less of varieties, poor spectral compatibility between the emission spectra of these light-converting materials and the absorption spectra of chlorophyll, poor chemical stability, short service lifetime, low light-converting efficiency, and so on. This project focuses on the study of the relationship between the chemical compositions, structures and light-converting properties of rare earth ions or transition metal ions doped alkaline metal (oxy)nitride phosphors. The research strategies including the design of the nephelanxetic and covalent character within various (oxy)nitride matrix, controlling of the morphology, screening the absorption, excitation, and emission spectra, enhancing the chemical stability, and improving the light-converting efficiency. The target of this project is to achieve various novel agricultural applicable blue and red light emitting light-converting materials with excellent characters including higher light-converting efficiency, good spectra matching, better stability, cost-effective, and eco-friendly. Accordingly, the completion of this study will open up a new application of (oxy)nitride luminescence materials in the field of agriculture, and the obtained novel light-converting materials is expected to meet the application requirements of modern ecological agriculture. Through these research processes of this project, new preparation technology for novel agricultural applicable light-converting materials with independent intellectual property rights will be obtained. At the same time, basis data accumulation and technical guidance for more novel (oxy)nitride phosphor with high performance and practicability will be provided, which will necessarily promote the research and development process of novel (oxy)nitride phosphors.

本项目针对目前可用农用转光材料品种少、光谱匹配度差、稳定性差、寿命短、转光效率低等系列不足，研究氮(氧)化物荧光粉组成、结构和转光性能之间的相互影响规律，通过调控稀土离子或过渡金属离子掺杂碱土金属氮(氧)化物的共价性、形貌、吸收和激发波长、发射波长等，提高材料稳定性及转光效率，获取多种蓝色发光、红色发光的转光率高、光谱匹配好、稳定性高、性价比高、生态友好的农用转光材料。本项目的研究和完成，将开拓氮(氧)化物发光材料在农业领域的新应用，可望满足现代生态农业用新型转光材料的现实需要，进而获得具有我国自主知识产权的农用转光材料体系及其新型制备技术；同时亦为更多新型、高性能、实用性氮(氧)化物发光材料的开发提供基础数据积累及技术指导，推动新型氮(氧)化物荧光粉研究开发进程。

项目研究之前，可用农用转光材料品种少、光谱匹配度差、稳定性差、寿命短、转光效率低。本项目针对性开展工作并取得了以下主要研究进展：1) 研究了多种氮化物、氮氧化物以及部分氧化物体系的无机转光材料的组成、结构、发光性能与光谱转换之间的构效关系，分别涉及CaAlSiN3:Eu2+、SrLiAl3N4:Eu2+、Li2Ca2Mg2Si2N6:Eu2+、Ca14Al10Zn6O35:Mn2+、GdSr2AlO5:Tb3+,Eu3+等，把可用的转光材料体系从无机材料体系拓展到碳点、硅点及其复合材料。2) 对于转光方式，从传统的薄膜转光拓展到PC复合转光板转光、PiG荧光玻璃转光、体内叶绿体捕光转光等。先后开展了CaAlSiN3:Eu2+氮化物荧光粉的T8灯管用PC转光罩、CaAlSiN3:Eu2+与BAM荧光粉拼盘式宽带发射陶瓷材料、以及Li2Ca2Mg2Si2N6:Eu2+荧光粉及其复合材料的转光性能研究。3) 对于转光作用场所，从植物体外宏观转光拓展到植物体内微观转光。宏观层面，开展了不同转光膜的种植实验，取得了良好的增产和质量改善效果。微观层面，将碳点及硅点材料，以水培、叶面喷施、基质栽培等方式进入到植物体内，在体内捕光、转光，可促进营养成分的吸收及转化等，具有良好的效果。4) 对于光质转换后作物的增产机理，也进行了系列的探讨和研究。离体叶绿体和生菜体内实验中均可证实，远红光碳点附着在叶绿体表面形成杂化光合系统，将阳光中的近紫外光转换为能够被叶绿体高效利用的远红光，使得叶绿体中光合系统II和光合系统I之间的电子传递速率增大、ATP产量提高、光合作用速率增强。本项目执行期间，共计在Adv. Funct. Mater., Angew. Chem. Int. Ed., Chem. Mater.等杂志上发表高水平研究论文38篇，影响因子大于5.0的共计21篇，申请(含授权)中国发明专利共10件。部分成果作为支撑获得2018年度广东省技术发明二等奖(本人排名第一)。研究成果在推广过程中获得种植户的肯定，获得2019年度广东省农业技术推广三等奖(本人排名第一)、2019年获“中国商业联合会科技进步奖一等奖(本人排名第二)。此外，应邀参加国际及国内学术会议和企业调研，做邀请报告或主题报告共计12人次。培养研究生共计16人。