White light emission and energy transfer of LaMgAl11O19:Eu3+, Tb3+ phosphors

Abstract

AbstractWhite‐light‐tunable LaMgAl11O19:x%Tb3+, y%Eu3+ series phosphors were prepared using the gel‐combustion method. The structure and luminescence properties were studied, and the energy transfer of Eu3+ and Tb3+ in the LaMgAl11O19 system was also discussed. The results showed that the LaMgAl11O19 matrix exhibited strong emission in the blue‐light region under the excitation of ultraviolet light, which resulted in conditions suitable for the preparation of white‐light‐tunable phosphors. The emission spectra of LaMgAl11O19:2%Tb3+, y%Eu3+ (y = 2%–9%) series phosphors were obtained through optimization experiments. It could be seen from the CIE diagram that by adjusting the doping quantities of Eu3+ and Tb3+ in the LaMgAl11O19 host, multicolor luminescence and white light emission in a single host could be achieved. By calculating the energy transfer efficiency and critical distance between Eu3+ and Tb3+ series phosphors, the mechanism of energy transfer between Tb3+ and Eu3+ was found to be the interaction between electric quadruples.