Time-resolved spectroscopy of the visible emission band in strontium titanate

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

“…This interaction, which can be examined by means of time-resolved spectroscopy analyses, has already been investigated by several authors. [14][15][16][17] In our model, the wild band model 67 illustrated in Fig. 10, the most important events occur before excitation, i.e., before the arrival of the photon.…”

“…14,15 More recently, several phenomena of photoluminescence ͑PL͒ at low temperature have been reported in the perovskite-type structure and the effects observed have been ascribed to the recombination of electrons and hole polarons forming a charge transfer vibronic exciton. 16,17 In nanocrystalline ST, PL has been detected at room temperature and with excitation energies below the energy band gap.…”

Room-temperature photoluminescence ofBaTiO3: Joint experimental and theoretical study

“…The origin of the PL is investigated in terms of electronic structure calculations realized in the framework of first-principles quantummechanical techniques. The aim of this synergetic strategy between experimental results and electronic structure study is not to explain how PL occurs, as many valuable hypotheses already exist, [17][18][19] but to explain why it occurs at room temperature in the noncrystalline powders.…”

Mechanisms behind blue, green, and red photoluminescence emissions in CaWO4 and CaMoO4 powders

“…We also investigated the electronic structure and optical properties using first-principles calculations based on the density functional theory ͑DFT͒. The purpose of employing this synergistic strategy combining experimental results and a theoretical study of the electronic structure was not to explain how photoluminescence ͑PL͒ decay occurs, since many valid hypotheses already exist, 4,5 but to ascertain why it occurs at room temperature in ordered and disordered powders.…”

“…Mechanisms behind blue, green, and red photoluminescence emissions in CaWO 4 Materials belonging to the tungstate and molybdate families have a long history of practical applications and have been the object of extensive research over the past century. The continuous interest in these compounds lies in their excellent optical properties, which form the basis of their wide use as phosphors, laser materials, and scintillation detectors.…”