Preparation And Luminescence Properties Of Cr³⁺ Doped Near Infrared Stannate

A new type of near infrared luminescent material Mg₂SnO₄:Cr³⁺was successfully synthesized by the traditional high temperature solid state method,luminescence properties of which were also researched.The results showed that the samples exhibit near-infrared emission of 600-850 nm under the excitation of 470 nm blue light,When the concentration of Cr³⁺was 0.02,the luminescence intensity was the highest,and the concentration quenching phenomenon was caused by multi-pole interaction.With the increase of Cr³⁺doping concentration,the fluorescence lifetime of the sample decreases gradually.In addition,the sample also showed a long afterglow.A new type of near-infrared long afterglow luminescent material Mg_1.4Zn_0.6SnO₄:Cr³⁺(MZSO:Cr³⁺)was synthesized by the dopant of Zn ion.The properties of phase structure,luminescence,thermal stability,defect distribution and afterglow attenuation were discussed.The results showed that all the synthesized samples were in pure phase,and after MZSO:Cr³⁺was effectively excited by blue light,a sharp emission peak?708 nm?and a broadband emission peak?730 nm?were generated,which were attributed to the characteristic transitions of ²E?⁴A₂ and ⁴T₂?⁴F??⁴A₂ of Cr³⁺.After the removal of the excitation light source,the material showed excellent long residual luminescence performance.When the Cr³⁺doping concentration x=0.005,the afterglow of the sample was the strongest.The thermoluminescence spectrum of the sample was analyzed,and the distribution of traps in the matrix was discussed.Finally,we put forward the possible afterglow mechanism.