Preparation And Study Of Red Long Persistent Luminescence Materials Based On Oxide

Long persistent luminescence materials have attracted the attention of researchers because of their ability to glow continuously after excitation.At the beginning,Long persistent luminescence materials were used in the field of low-light lighting.At present,the long afterglow materials developed and up to the commercial standard are concentrated in the blue and green light region,while the red light region has few achievements,and the development of the red long persistent luminescence materials has a broader application prospect for the long persistent luminescence materials.In this paper,Ca₁₄Zn₆Ga₁₀O₃₅:Pr³⁺and Na₉Ge₅GaZn₄O₁₀:Pr³⁺/Mn²⁺gallium germanate materials are mainly studied.After the preparation of single phase,The luminescence and afterglow properties of the samples were studied in detail,and the afterglow mechanism was analyzed by thermoluminescence spectroscopy.Try to improve the afterglow properties of materials.The main contents of this paper are as follows:Ca₁₄Zn₆Ga₁₀O₃₅5 and Ca₁₄Zn₆Ga₁₀O₃₅:Pr³⁺samples were prepared by high temperature solid phase method at 1200?.The single phase was determined by X-ray powder diffraction.Under the excitation of 318nm,the matrix has near-infrared emission and a short time of afterglow.The emission peak at 711nm,and the afterglow time is about 2-3min.Ca₁₄Zn₆Ga₁₀O₃₅:Pr³⁺has the characteristic emission of Pr³⁺under 450nm excitation,with the main peak at 620nm.After doping with Pr³⁺,the afterglow time of the sample was prolonged.The best sample was the sample with the doping concentration of 0.3%,and the afterglow time was about 21min.The afterglow emission spectrum was tested,which was similar to that of the matrix.A new red long afterglow material Na₉Ge₅GaZn₄O₁₀:Pr³⁺was prepared by high temperature solid phase method at 1100?.XRD was used for phase analysis of the sample,and the band gap calculated by diffuse reflection spectrum was 5.14ev.Under the monitoring wavelength of 650nm,the excitation peak is located at 483nm.Under the excitation of 483nm,the main peak of sample emission at 650nm,showing red light.The afterglow time of the best sample is about 2.5h.The trap was analyzed by thermoluminescence of the sample and the trap depth was calculated to be about0.5976eV.In the study,it was found that the sample Na₉Ge₅GaZn₄O₁₀:xMn²⁺emitted green light,with the emission peak at 536nm and a short afterglow time.At last,we tried to improve the afterglow property of the sample by solid solution and co-doped rare earth ions.