Sr~(2+)共掺杂YPO_4:Eu~(3+)发光材料的水热合成及其性能

采用水热法合成Sr~(2+)共掺杂YPO_4:Eu~(3+)发光材料,采用X射线衍射(XRD)和X射线荧光光谱对合成产物的物相结构和光学性能进行表征,对Sr~(2+)共掺杂浓度及反应体系p H值对合成样品的物相结构及发光性能的影响进行分析。结果表明,少量Sr~(2+)(≤15at%)共掺杂YPO_4:1at%Eu~(3+)均为纯相四方磷钇矿结构晶体,过量Sr~(2+)(≥20at%)共掺杂出现Sr_4P_2O_9杂相;p H值为6的反应体系可获得高结晶度的单一相Sr~(2+)、Eu~(3+)共掺杂YPO_4样品。X射线荧光光谱分析结果表明,采用水热法合成的YPO_4:1at%Eu~(3+),xat%Sr~(2+)样品可被396 nm的紫外光激发而发射出强烈的Eu~(3+)特征橙红色光,一定量的Sr~(2+)共掺杂能提高YPO_4:1 at%Eu~(3+)样品的发光性能,过量(10at%)的Sr~(2+)掺杂导致Eu~(3+)荧光猝灭。YPO_4:1at%Eu~(3+),10at%Sr~(2+)样品在396 nm紫外光激发下位于620 nm处的发射峰相对强度较YPO_4:1at%Eu~(3+)样品提高了72.6%。

Sr2 co-doped YPO4:Eu3 phosphors: hydrothermal synthesis and optical properties

Sr2 co-doped YPO4:Eu3 phosphors were successfully synthesized by hydrothermal method. The crystal structure and optical properties of the as-synthesized samples were investigated by XRD and photoluminescence. The influences of Sr2 co-doping concentration and precursor solution pH on the phase structure and luminescence properties of the as-produced samples were investigated. The results show that the Sr2 co-doped YPO4:1 at % Eu3 samples with Sr2 doping content no more than 10 at % are single-phase crystals with tetragonal xenotime structure, Sr4P2O9 impurity phase can be observed in the samples with a large amount of Sr2 . The pure phase and high crystallinity Sr2 , Eu3 co-doped YPO4 samples can be obtained at pH 6 condition. The results of excitation spectra and emission spectra show that the YPO4:1 at % Eu3 , x at % Sr2 samples can be excited by 396 nm UV light and emit the characteristic red-orange light of Eu3 . An appropriate amount of Sr2 co-doped YPO4:1 at % Eu3 samples display enhanced luminescence, and a large amount of Sr2 (more than 10 at %) co-doping in the YPO4:1 at % Eu3 samples can quench the Eu3 emission. The intensity of emission peak located at 620 nm of YPO4:1 at % Eu3 , 10 at % Sr2 sample is stronger about 72.6 % than that of YPO4:1 at % Eu3 sample.