Mechanisms and dynamics of energy transfer sensitization in the Eu3+, Cr3+ and Fe3+ ions in the LiAl5O8 phosphors

Effect of Cr3+ doping on structural and optical properties of Eu3+ doped LaVO4 phosphor

“…On excitation of Eu 3+ ion, a small amount of energy is transferred to Cr 3+ ion, which decreases the PL intensity of Eu 3+ ion. 47,48 This clearly shows that the Cr 3+ ion works as intensity quencher even for smaller concentration of Cr 3+ ion. This can be well reflected in the lifetime measurements as the lifetime of 5 D 0 level of 5 D 0 → 7 F 2 transition at 614 nm is expected to decrease with the concentration of Cr 3+ ion.…”

“…The weak emission bands in the green region are due to 5 D 1 / 7 F 0 (525 nm), 5 D 1 / 7 F 1 (537 and 531 nm) and 5 D 1 / 7 F 2 (565 nm) transitions, which are reported only in few host materials. 46,47 The emission bands from 5 D 1 level is observed only on excitation with 316 nm wavelength.…”