Optical properties of Bi and energy transfer from Bi to Tb in MgAl2O4 phosphor

Phase transformation of ZrO2:Tb3+ nanophosphor: Color tunable photoluminescence and photocatalytic activities

“…The critical distance for energy transfer (R c ) in ZrO 2 :Tb 3+ was estimated from the structural parameters namely unit cell volume (V), total Tb 3+ sites per unit cell (N) and critical concentration (X c ) [65].…”

Concentration quenching, surface and spectral analyses of SrF2:Pr3+ prepared by different synthesis techniques

“…1(b) shows Williamson-Hall plots for the combustion and hydrothermal samples, where the peak broadening is dependent on both crystallite size and microstrain. The Williamson-Hall equation is given by bcos h = Kk/S + 4e sin h, where k is the wavelength of the X-rays (0.154 nm) and b is the full-width at half maximum of the X-ray peak at the Bragg angle h, K is a shape factor taken as 0.9, S is the crystallite size and e is the microstrain [18].…”

Luminescent properties of Bi3+-activated Ca2Sb2O7 nano-phosphor prepared by co-precipitation method

“…The ground state of the free Bi 3þ ion is 1 S 0 while the 6s16p1 excited states are 3P 0 , 3P 1 , 3P 2 and 1P 1 in order of increasing energy [9,10]. Although electron transitions between 1 S 0 level and 3P J levels are theoretically spin forbidden, 1 S 0 / 3P 1 transition become partly allowed due to spineorbit coupling.…”