Preparation And Luminescence Properties Of Gd₂O₂S:Tb³⁺ Ultrafine Phosphor

Rare earth sulfur oxides have the advantages of stable physical and chemical properties,strong absorption capacity,high conversion efficiency and strong emission in visible light,and are widely used in displays,LEDs,X-ray intensifiers and other technologies.This paper briefly introduces the physical and chemical properties,development history and research progress at home and abroad of rare earth doped sulfur oxides.The main preparation methods of phosphors and their advantages and disadvantages are compared in detail.The purpose and significance of the topic selection are summarized,and the main discussion contents of this paper are planned.Gd₂O₂S:Tb³⁺phosphors were prepared by high-temperature solid-state method and coprecipitation-sulfurization flux method respectively.The structure,morphology,particle size and luminescent properties of the samples were analyzed in detail to determine the best sintering temperature and holding time,and the interaction mechanism between Tb³⁺ions was discussed.The details are as follows:1.Gd₂O₂S:Tb³⁺phosphor was prepared by high-temperature solid-state method using nano-Gd₂O₃ as raw material.The effects of synthesis calcinated temperature,Soaking time and Tb³⁺doping concentration on the morphology and luminous intensity of Gd₂O₂S:Tb³⁺phosphor were discussed.The phase structure,morphology,luminous performance,fluorescence lifetime and interaction between Tb³⁺ions of Gd₂O₂S:Tb³⁺phosphor were analyzed in detail and determined.The optimum doping concentration of Tb³⁺is 4%and D50 is 3.511μm,and the optimum synthesis temperature of the phosphor was determined to be 950℃and the optimum holding time was 2 h.2.Gd₂O₃:Tb³⁺precursor was synthesized by co-precipitation method,and then Gd₂O₂S:Tb³⁺phosphor was prepared by sulfuration flux method.The synthesis process of Gd₂O₃:Tb³⁺precursor and the influence of the morphology and grain size of the precursor on Gd₂O₂S:Tb³⁺phosphor were explored.The optimum synthesis temperature and holding time of Gd₂O₃:Tb³⁺precursor were determined to be 850℃and and the optimum holding time was 1.5 h.The phase structure,morphology,luminescent properties,fluorescence lifetime and the interaction between Tb³⁺ions of Gd₂O₂S:x Tb³⁺phosphor were analyzed in detail.When the optimum doping concentration of Tb³⁺in Gd₂O₂S:Tb³⁺phosphor is 3.5%,the D50 is 2.775μm.