Preparation And Performance Of Rare-earth-doped Calcium Silicon Phosphate Luminescent Materials

Rare-earth doped calcium silicon phosphate powder is a good luminescent material,the excellent optical properties of this material have been verified,this paper will explore the preparation process and related properties of rare-earth doped calcium silicon phosphate material.In this paper,Tb³⁺、Eu³⁺、Li⁺、Na⁺and K⁺doped alone or co-doped with calcium silicon phosphate materials were prepared by high-temperature solid-phase method,as Ca₅（PO₄）₂Si O₄:Tb³⁺/Eu³⁺/Li⁺/Na⁺/K⁺(CPS:Tb³⁺/Eu³⁺/Li⁺/Na⁺/K⁺)phosphors,and the physical phase,chemical composition,morphology and optical properties of the phosphors were studied by regulating the doping content of the elements.The physical phase,chemical composition,morphology and optical properties of the phosphors were studied by regulating the doping content of the elements;the physical phase,morphology,optical properties and cytocompatibility of europium-doped calcium silicon phosphate phosphors were investigated.The main findings are as follows:（1）A series of phosphors were prepared by high-temperature solid-phase method,and the highest emission intensity of the phosphors was obtained for x=0.05 in CPS:x Tb³⁺（x=0-0.1）phosphors,and the energy transfer mechanism was analyzed using multipolar interaction theory,and it was concluded that the energy transfer process of Tb³⁺→Tb³⁺in CPS:Tb³⁺phosphors was a nearest-neighbor ion interaction;Compared with CPS:0.05Tb³⁺phosphor,alkali metal ions（A=Li⁺,Na⁺,K⁺）as charge compensators can significantly increase the emission intensity of CPS:0.05Tb³⁺,0.05A phosphor,and the physical phase of the powder does not change significantly,in which,Na⁺as charge compensator is the most effective after doping.Further experimental results showed that the emission intensity of phosphors was also greatly enhanced after Na⁺was incorporated as charge compensator in the CPS:Eu³⁺and CPS:Tb³⁺,Eu³⁺systems;（2）When the excitation wavelength is 376 nm,the phosphor showed obvious fluorescence characteristics,mainly blue-green light of Tb³⁺and red light of Eu³⁺in the phosphor,and the CPS:0.05Tb³⁺,0.05Na⁺,x Eu³⁺,x Na⁺（x=0.005,0.01,0.03,0.05）was achieved by tuning the Eu³⁺/Tb³⁺content.the tunable color change of the phosphor from green to orange and finally to red;（3）The Eu-CPS phosphors was prepared by high-temperature solid-phase method,and the XRD pattern showed no obvious heterogeneous peaks,when the excitation wavelength is 393 nm,the emission spectrum showed the characteristic emission peaks of Eu³⁺,in which the ⁵D₀→⁷F₂ jump at 614 nm was the strongest,and it was a typical red emission,and its color gradually became darker with the increase of europium doping;（4）Eu-CPS phosphors have good cytocompatibility and can promote the proliferation of Mouse Fibroblast Cells（L929）to a certain extent.For Mouse pancreatic islet microvascular endothelial cells（MS-1）,1Eu-CPS and 3Eu-CPS groups can promote the cell proliferation,CD31 expression and neovascularization,this result indicates that Eu-CPS phosphor has good biological activity and has some application prospects in the subsequent biological experiments.