Site-Bi3+ and Eu3+ dual emissions in color-tunable Ca2Y8(SiO4)6O2:Bi3+, Eu3+ phosphors prepared via sol-gel synthesis for potentially ratiometric temperature sensing

Preparation and luminescence properties of ZnWO4:Eu3+,Tb3+ phosphors

“…The increase in decay times with increasing Tb 3+ concentration in ZnWO 4 :5%Eu 3+ ,yTb 3+ samples further certified the existence of energy transfer from Tb 3+ to Eu 3+ ions in ZnWO 4 :Eu 3+ ,Tb 3+ phosphors. [ 20 ]…”

Orange‐Red‐emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd‐Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED

“…The decrease of the PL intensity at the high doping concentration of 10 % could be due to concentration quenching effect [23,39–41] . It is reported that the particular mechanism of the quenching phenomenon in the photoluminescence intensity could be interpreted by studying the effective energy transfer through this critical distance (R c ) which could be estimated by this equation 2 [42–45] …”

Controllable crystal form transformation and luminescence properties of up-conversion luminescent material K3Sc0.5Lu0.5F6: Er3+, Yb3+ with cryolite structure

“…Because the energy gap between 2 H 11/2 and 4 S 3/2 is small, the 2 H 11/2 state could be populated from 4 S 3/2 by thermal excitation, which leads to the variations of emission intensity of 2 H 11/2 and 4 S 3/2 transitions at elevated temperature. 49 The relative population of the "thermally coupled" 2 H 11/2 and 4 S 3/2 levels is a quasithermal equilibrium obeying Boltzmann-type distribution, because the emission intensity varies as a function of temperature. 50 Potential temperature measurement applications are related to uorescence intensity ratio (FIR), which can be evaluated using the following formula:…”