Luminescent properties of MgAl2O4 material doped with rare earth ions Tm3+
To investigate the luminescent properties of Tm3+in MgAl2O4 materials,MgAl2O4∶Tm3+phosphors were prepared using the high-temperature solid-state method.The samples'structure,morphology,and luminescent properties were characterized,and the effects of different Tm3+doping concentrations on the luminescent properties of the materials were analyzed.The results indicated that a small amount of Tm3+doping did not alter the main phase structure of the material.The doped Tm3+occupied the Mg2+position in the MgAl2 O4 lattice,forming a solid solution.The grain shape was irregular,exhibiting a polygonal structure with evident agglomeration and large,irregular particles.The MgAl2O4∶Tm3+phosphor demonstrated strong blue emission at 460 nm and weak red emission at 650 nm under 363 nm laser excitation.The optimal luminescence concentration of MgAl2O4∶Tm3+was 0.005.The concentration quenching mechanism was due to the energy transfer between Tm3+and holes,as well as the(Tm3+-Tm3+)electric dipole-electric dipole(d-d)interaction.With good blue luminescent properties,The phosphor has promising research prospects for applications in light-source devices and multicolor displays.
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