Role of oxygen vacancy in rare-earth-free LiCa_(3)Mg(VO_(4))_(3) phosphor: Enhancing photoluminescence by heat-treatment in oxygen flow

作     者：Yixuan Lv Yijun Zhang Le Shi Jian-Wen Shi Jun Li Zhihui Li Xin Ji Dandan Ma Yonghong Cheng Chunming Niu Yixuan Lv;Yijun Zhang;Le Shi;Jian-Wen Shi;Jun Li;Zhihui Li;Xin Ji;Dandan Ma;Yonghong Cheng;Chunming Niu

作者机构：State Key Laboratory of Electrical Insulation and Power EquipmentCenter of Nanomaterials for Renewable EnergySchool of Electrical EngineeringXi’an Jiaotong UniversityXi’an710049China Key Laboratory of Electronic Ceramics and Devices of Ministry of EducationDepartment of Electronics and InformationXi’an Jiaotong UniversityXi’an710049China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第79卷第20期

页      面：123-132页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0803[工学-光学工程] 

基　　金：This work was sponsored by the National Natural Science Foundation of China(21972110,51702253) the National Key R&D Program of China(2018YFF02123001) the State Key Laboratory of Electrical Insulation and Power Equipment,China(EIPE19123) 

主　　题：Phosphor Oxygen vacancy Surface defect Rare-earth-free White light emitting diode 

摘      要：As a kind of white light emitting diode(w-LED)with many advantages,rare-earth-free vanadate phosphor has attracted more and more *** oxygen vacancies and other surface defects in vanadate oxide have obvious effects on its structure and *** order to reveal the specific effects,we heat-treat the original LiCa_(3)Mg(VO_(4))_(3)(LCMV)in an oxygen flow with different time to decrease oxygen vacancies,and find that the lattice distortion of[VO_(4)]tetrahedron caused by oxygen vacancy is effectively ***,the crystallinity of the treated samples increases,the surface defects decreases,and the fluorescence intensity *** variation of photoluminescence quantum yield(PLQY)with oxygen treatment time is as follows:the enhancement effect firstly reaches the strongest(69.34%)within one hour,then begins to decline after two hours,and finally reaches the platform after three hours and remains basically *** reason for the enhancement of PLQY is the decrease of oxygen vacancy after one-hour treatment,and the reason for the decrease of PLQY after a further increased treatment time is that the absorption of oxygen and water in air caused by excessive surface defects introduced by oxygen treatment.