Study On The Preparation And Luminescent Properties Of The Rare Earth Co-doped Mg_0.5Ti₂?PO₄?₃ Phosphor

The phosphate phosphors have been widely researched in recent years.The phosphate phosphors have an extensive range of applications in luminescence and display,which is due to their advantages of the ease of synthesis,low cost and favorable fluorescence.The LEDs is regarded as a new generation of lighting due to long service life and more energy-efficient.In this paper,rare earth ions doped into titanium phosphate phosphors were prepared by the high temperature solid,and the luminescence properties and the energy transfer from the Dy³⁺to Eu³⁺ions were further studied.The experimental results show that the luminescent material might be as a potential single phase phosphors for LED under ultraviolet excitation.First of all,the M_g0.5-xTi₂?PO₄?₃:x Dy³⁺phosphor were prepared by solid-state reaction method,and the emission spectra and excitation spectra were measured.The emission spectra were studied.It was conformed that the quench concentration of Dy³⁺in M_g0.5Ti₂?PO₄?₃ host was 0.06 mol,which was caused by a dipole-dipole interaction.Secondly,the Mg_0.5-xTi₂?PO₄?₃:xSm³⁺phosphor were prepared by solid-state reaction method,and their emission spectra and excitation spectra were measured.In this experiment,it was found that the quenching concentration of Sm³⁺ions was0.10mol in the Mg_0.5Ti₂?PO₄?₃ host,and the concentration quenching mechanism of Sm³⁺ions in Mg_0.5Ti₂?PO₄?₃ host was proved to be the electric dipole-quadrupole interaction.Finally,the Mg_0.5-x-yTi₂?PO₄?₃:x Dy³⁺,yEu³⁺phosphors were excited by 348nm and 387nm,respectively.The emission colors of Mg_0.5-x-yTi₂?PO₄?₃:x Dy³⁺,yEu³⁺?x=.02,y=0.00,0.02,0.03,0.04,0.05?were located in the white light region.By adjusting the concentration of rare earth ions and the excitation wavelength,the chromaticity coordinates of the samples can close to the ideal white?0.33,0.33?.In this paper,the energy transfer between Dy³⁺-Eu³⁺ions was further studied.It was found that the Dy³⁺ions are excited by 387nm,and then the energy was transferred from Dy³⁺to Eu³⁺ions by the dipole-dipole interaction.In addition,the correlated color temperature is improved with the introduction of Eu³⁺ions due to the energy transfer from Dy³⁺to Eu³⁺.