CAJ | 학술논문

利用复合沉淀法制备了性能稳定的红色荧光粉La2O3∶Eu3+，同时研究了煅烧温度及掺杂Eu3+浓度对La2O3∶Eu3+发光性能的影响.通过X射线粉末衍射（XRD）和扫描电子显微镜（SEM）来表征荧光粉的晶体结构和颗粒大小及形貌；用激发光谱和发射光谱以及荧光衰减曲线来表征荧光粉的荧光性能.结果表明：煅烧温度在900℃时，所制备样品为六方晶系La2O3∶Eu3+；SEM图显示掺杂Eu3+含量为5%的La2O3颗粒直径为15μm左右.最大发射波长和激发波长分别为626 nm和396 nm，发射光谱中596 nm和626 nm的发射峰对应的是Eu3+离子的5D0→7F1和5D0→7F2跃迁，其荧光寿命为0.754 ms.
이용복합침정법제비료성능은정적홍색형광분La2O3∶Eu3+，동시연구료단소온도급참잡Eu3+농도대La2O3∶Eu3+발광성능적영향.통과X사선분말연사（XRD）화소묘전자현미경（SEM）래표정형광분적정체결구화과립대소급형모；용격발광보화발사광보이급형광쇠감곡선래표정형광분적형광성능.결과표명：단소온도재900℃시，소제비양품위륙방정계La2O3∶Eu3+；SEM도현시참잡Eu3+함량위5%적La2O3과립직경위15μm좌우.최대발사파장화격발파장분별위626 nm화396 nm，발사광보중596 nm화626 nm적발사봉대응적시Eu3+리자적5D0→7F1화5D0→7F2약천，기형광수명위0.754 ms.
A stable La2O3:Eu3+ red phosphor is prepared by composite precipitation method. The influences of the calcination temperature and the concentration of Eu 3+on the luminescent properties are studied. The crys-tal structure, particle size and morphology of the phosphor are characterized by X-Ray Powder Diffraction (XRD) and Scanning Electron Microscope (SEM) techniques. The luminescent properties of phosphor are mea-sured by emission spectra, excitation spectra and decay curve. The results indicate that the as-prepared sam-ples are La2O3:Eu3+ crystals of hexagonal phase by annealing at 900 ℃. The diameter of the particles of 5 %La2O3:Eu3+ is about 15 μm. The maximum emission and excitation wavelength are at 626 nm and 396 nm, re-spectively. The band at 596 nm and 626 nm are corresponding to 5D0→7F1 and 5D0→7F2 transition of Eu3+ions in emission spectrum. The fluorescence lifetime of La2O3:Eu3+phosphor is 0.754 ms.