Interband optical transitions in Gd₂O₃: Er nanoparticles – prospective system for energy convertors

Intrinsic Defect‐Assisted UV–Visible Energy Conversion in Gd2O3:Er Nanoparticles

“…We performed analysis of spectral reflection data using Kumar's analytical approach for the case of indirect interband transitions in order to determine effective phonon frequency in Gd 2 O 3 nanoparticles with different concentration of dopant (see Table ) . A full detailed description of processing algorithm is given in our previous papers . The obtained values of phonon frequencies are presented in Table .…”

“…We observe the so‐called effect of giant phonon softening . The possible reason for this phenomena is the behavior of local defective phonon modes induced by the Er 3+ introduction into the Gd 2 O 3 lattice . The significant decrease in phonon energy opens up the new possibilities for minimizing thermal losses and, as a result, increases the overall efficiency of energy conversion.…”

“…The frequency of lattice vibrations can be found from reflection spectra analysis using the approach described in details in refs. . The reflection spectra are the primary data for obtaining absorption dependences in the region of interband transitions for the nontransparent samples (powders, compacts, ceramics).…”

“…[31,33] A full detailed description of processing algorithm is given in our previous papers. [32] The obtained values of phonon frequencies are presented in Table 3. These phonons participate in the formation of fundamental absorption edge for indirect interband transitions at nonzero temperatures and affect the probabilities ratio for radiative/non-radiative relaxation of Er 3þ excited state at excitation by energy transfer from Gd 3þ .…”

“…The possible reason for this phenomena is the behavior of local defective phonon modes induced by the Er 3þ introduction into the Gd 2 O 3 lattice. [32] The significant decrease in phonon energy opens up the new possibilities for minimizing thermal losses and, as a result, increases the overall efficiency of energy conversion. One more factor that should exactly contribute to an increase in overall conversion quantum yield is the growth of Gd 3þ !…”