The effect of GdF3 on red emission of Eu3+: LiYF4 single crystals grown by the Bridgman method

A Novel Zero-Thermal-Quenching Red Phosphor with High Quantum Efficiency and Color Purity

“…It can be seen that the fluorescence lifetime does not change significantly after Sc 3+ or Y 3+ ions are co-doped, while the fluorescence lifetime of phosphors increases from 1.3971 ms to 1.7027 ms after co-doping of Gd 3+ ions. The increase of fluorescence lifetime confirms the energy transfer of Gd 3+ ions to Sm 3+ ions to some extent[51][52][53].…”

“…It can be seen that the fluorescence lifetime does not change significantly after Sc 3+ or Y 3+ ions are co-doped, while the fluorescence lifetime of phosphors increases from 1.3971 ms to 1.7027 ms after co-doping of Gd 3+ ions. The increase of fluorescence lifetime confirms the energy transfer of Gd 3+ ions to Sm 3+ ions to some extent[51][52][53].Figure11expresses the emission spectra of K 5 La 0.93 (MoO 4 ) 4 : 0.07Sm 3+ (a) and K 5 La 0.86 (MoO 4 ) 4 : 0.07Sm 3+ , 0.07Gd 3+ (b) phosphors, as well as the changes of emission intensity at different temperature (inset). With the increase of temperature, the emission intensity of phosphors first shows a certain enhancement and reaches the highest value at 348 K, and then with the further increase of temperature, although the emission intensity of phosphor gradually decreases, it still keeps at 1.3-1.9 times of the initial emission intensity at 473 K.In theory, with the increase of temperature, thermal motion of the molecules becomes more active, the phonon action is enhanced, and the probability of the excited electrons returning to the ground state through the form of non-radiative transition increases, eventually the thermal quenching takes place[54].…”