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

Abstract

White-light-tunable LaMgAl 11 O 19 :x%Tb 3+ , y%Eu 3+ series phosphors were prepared using the gel-combustion method. The structure and luminescence properties were studied, and the energy transfer of Eu 3+ and Tb 3+ in the LaMgAl 11 O 19 system was also discussed. The results showed that the LaMgAl 11 O 19 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 LaMgAl 11 O 19 :2%Tb 3+ , y%Eu 3+ (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 Eu 3+ and Tb 3+ in the LaMgAl 11 O 19 host, multicolor luminescence and white light emission in a single host could be achieved. By calculating the energy transfer efficiency and critical distance between Eu 3+ and Tb 3+ series phosphors, the mechanism of energy transfer between Tb 3+ and Eu 3+ was found to be the interaction between electric quadruples.

A Comparative Study of SiO2:Tb3+@Gd2O3:Eu3+ and Its Inverted Tb3+-Eu3+ Core–Shell Phosphors

“…In addition, according to Figure b, although the concentration of Eu 3+ remains unchanged at 4%, the emission intensity of both Tb 3+ and Eu 3+ increases with the increase in Tb 3+ concentration until the highest emission intensity occurs at 3% of Tb 3+ doping concentration, and then, the emission intensity decreased when increasing the Tb 3+ concerntration. This phenomenon verifies the presence of IET from Tb 3+ to Eu 3+ . − …”