Swift heavy ion induced structural and optical properties of Y2O3:Eu3+ nanophosphor

Red-light-emitting inorganic La2CaZnO5 frameworks with high photoluminescence quantum efficiency: Theoretical approach

“…The clarity of the structural refinement data was verified by considering some reliability factors, such as the reliability factor for the weighted pattern (R wp ), reliability factor for the pattern (R p ), and the goodness-of-fit indicator (s). For perfect refinement, the reliability factors must be small (less than 10%), and the value of s should be close to unity [10]. In the present study, the parameters were observed to be well within the range of a proper fitting as summarized in Table 1.…”

“…It enhances the numbers of electrons due to thermalization, which helps the electron transitions between the excited and ground state and thereby released the energy by the formation of lattice vibration [48]. But in the present case, CLZ: Eu 3+ three-dimensional framework is combined with LaO 8 , CaO 10 where I 0 and I T are the luminescence intensities at room and testing temperatures, respectively, c is a constant, and k is the Boltzmann constant (8.617×10 −5 eV K −1 ). From the fitting of ln((I 0 /I T )-1) vs 1/kT gives the estimation of E a for the present phosphors.…”

“…The structural parameters obtained from the Rietveld analysis of the CLZ phases are given in Table 1. The structure of the undoped CLZ was estimated via the VESTA software [10][11] using the data obtained from the Rietveld refinement, as displayed in Fig. 4.…”

Radiative energy transfer in ZnAl2O4:0.1% Ce3+, x% Eu3+ nanophosphor synthesized by sol–gel process

“…4(b), which suggests that doping with Eu 3 þ at the higher concentration increases the defect population in the host crystal structure. The dislocation density was calculated using the relation as presented by Som et al [24]. In summary, our results shows that an increase in strain is accompanied by the decrease in crystallites sizes.…”

Crystal structure, energy transfer mechanism and tunable luminescence in Ce3+/Dy3+ co-activated Ca20Mg3Al26Si3O68 nanophosphors

“…13 shows sharp bands at 220, 309 and 388 nm for all three samples in the wavelength range 200-400 nm which is ascribed to splitting of the 4f-5d excitation band of the Ce 3 þ and Dy 3 þ ion. The appearance of these bands is mainly due to the formation of meta-stable energy states between the valence band and the conduction band by the RE 3 þ ions [46]. The Kubelka-Munk theory [47] was used to estimate the optical bandgap of the CMAS: Ce 3 þ /Dy 3 þ phosphor systems using diffuse reflectance spectrum.…”