Energy transfer to luminescent impurity by thermally quenching excitons in CdWO4:Sm

Temperature dependent energy transfer to Eu3+ emission centres in K5Eu(MoO4)4 crystals

“…The energy transfer with the formation of excitons from separated electrons and holes as an intermediate stage is the most probable channel in the case when ground or excited states of an emission centre are located within the energy bands of the crystal. 35 Indeed, the 2p O–4f Eu charge transfer band has not been observed by us, which implies that the 4f Eu 2+ states may be located within the conduction band. The efficiency of energy transfer from excitons decreases rapidly with temperature increase that is manifested in low efficiency of Eu 3+ luminescence excitation in the fundamental absorption region at room temperature (Fig.…”

“…This process resembles the process of energy transfer from electron–holes pairs trough an intermediate exciton state in Sm 3+ doped CdWO 4 crystals. 35…”

Bright UV-C Phosphors with Excellent Thermal Stability—Y1−xScxPO4 Solid Solutions

“…Its quenching starts at temperatures above 300 K for the most part of solid solutions ( x < 0.8). It has been previously shown that thermal quenching of self-trapped excitons occurs due to their hopping diffusion in the crystal [ 52 ]. Excitons, whose localization is enhanced by the energy well creation will have lower probability of hopping diffusion or thermal disintegration, which would result in thermal quenching of luminescence.…”

Влияние температуры на люминесцентные свойства кристаллов CaMoO-=SUB=-4-=/SUB=- и SrMoO-=SUB=-4-=/SUB=-, беспримесных и легированных Nd-=SUP=-3+-=/SUP=-

“…5). Ранее на примере вольфраматов было показано, что процесс тушения собственной люминесценции связан с делокализацией экситонов в результате взаимодействия АЛЭ с фононами и возможностью миграции экситонов по кристаллу [23]…”