稀土离子掺杂钼酸盐荧光粉的制备及发光性能研究  

Preparation and luminescent properties of rare earth iondoped molybdate phosphors

作　　者：张朝光 党快乐 李华健 ZHANG Chaoguang;DANG Kuaile;LI Huajian(School of Materials Science and Engineering,Chang'an University,Xi an 710000,China)

机构地区：[1]长安大学材料科学与工程学院,西安710000

出　　处：《功能材料》2022年第8期8170-8175,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(51102023)。

摘　　要：稀土离子掺杂的上转换发光材料近年来在照明、太阳能电池行业有着广泛的应用。通过水热法制备了HO^(3+)/Yb^(3+)掺杂的NaGd(MO_(4))_(2)荧光粉,通过XRD、SEM、光谱分析等手段对NaGd(MO_(4))_(2)荧光粉进行了表征,研究了HO^(3+)/Yb^(3+)掺杂对钼酸盐荧光粉发光特性的影响。形貌结构分析表明,HO^(3+)/Yb^(3+)掺杂的NaGd(MO_(4))_(2)荧光粉均为纯的四方相结构,颗粒尺寸约为0.4~0.9μm,HO^(3+)/Yb^(3+)的掺杂使NaGd(MO_(4))_(2)荧光粉的晶胞参数变小。光谱分析表明,NaGd(MO_(4))_(2)荧光粉中546 nm处的绿光是来自HO^(3+)的^(5)F_(4)能级跃迁回^(5)I_(8)能级释放出的光子,659 nm处的红光是来自HO^(3+)的^(5)F_(5)能级跃迁回^(5)I_(8)能级释放出的光子;随着HO^(3+)掺杂量的增大,659 nm处的红光发射强度提高,当n(HO^(3+))∶n(Yb^(3+))=2.0∶5.0时,NaGd(MO_(4))_(2)荧光粉的红光发射峰强度最高;HO^(3+)的掺杂比例增大后,样品的CIE色坐标从绿光区域逐渐向红光区域移动。对样品的上转换跃迁机制分析发现,HO^(3+)/Yb^(3+)掺杂的NaGd(MO_(4))_(2)荧光粉在546 nm处的蓝光和659 nm处的红光均为双光子过程。Rare earth ion doped upconversion luminescent materials have been widely used in lighting and solar cell industries in recent years.NaGd(MO_(4))_(2) phosphors doped with HO^(3+)/Yb^(3+) were prepared by hydrothermal method.NaGd(MO_(4))_(2) phosphors were characterized by XRD,SEM and spectral analysis.The effect of HO^(3+)/Yb^(3+) doping on the luminescence properties of molybdate phosphors was studied.The analysis of morphology and structure shows that the NaGd(MO_(4))_(2) phosphors doped with HO^(3+)/Yb^(3+) have pure tetragonal phase structure,and the particle size is about 0.4~0.9μm.The doping of HO^(3+)/Yb^(3+) makes the cell parameters of NaGd(MO_(4))_(2) phosphor smaller.The spectral analysis shows that the green light at 546 nm in NaGd(MO_(4))_(2) phosphor is the photons released from the HO^(3+)transition from the ^(5)F _(4) energy level back to the ^(5)I_(8) energy level,and the red light at 659 nm is the photons released from the 5F 5 energy level back to the^( 5)I _(8) energy level.With the increase of HO^(3+) doping content,the red emission intensity at 659 nm increases.When n(HO^(3+))∶n(Yb^(3+))=2.0∶5.0,the red emission peak intensity of NaGd(MO_(4))_(2)phosphor is the highest,and when the doping ratio of HO^(3+)increases,the CIE color coordinates of the samples gradually move from the green region to the red region.The analysis of the upconversion transition mechanism of sample shows that the blue light of 546 nm and the red light of 659 nm of HO^(3+)/Yb^(3+)doped NaGd(MO_(4))_(2)phosphor are two-photon processes.

关 键 词：稀土掺杂 钼酸盐 上转换发光 发射光谱 跃迁机制 

分 类 号：O614.33[理学—无机化学]