Two-photon photoluminescence excitation spectra of perovskite nanocrystals in a glass matrix Matvei N. Bataev, Ivan V. Ignatiev, Evgenii V. Ubyivovk, Dmitrii V. Pankin, Mikhail B. Smirnov, Maria. S. Kuznetsova, Elena. V. Kolobkova Nanoscale, 2026 Two-photon excitation reveals hidden optical transitions in glass-embedded perovskite nanocrystals and demonstrates an enhanced nonlinear optical response.
Erasable laser 3D printing of stable perovskite CsPbBr3 nanocrystals in fluorophosphate glass Natalia K. Kuzmenko, Lev S. Logunov, Elena V. Kolobkova, Nikolay. V. Nikonorov, Sergey V. Makarov, Maria S. Kuznetsova, Matvey N. Bataev, Evgenii V. Ubyivovk Nanoscale, 2025 Three-dimensional patterning in glass: formation of perovskite nanocrystals in fluorophosphates glass matrix for studying crystallization process under ultrashort laser pulses and achieving reversible optical data recording.
Synthesis and optical properties of perovskite nanocrystals in glass with cationic substitution Maria S. Kuznetsova, Elena V. Kolobkova, Matvey N. Bataev, Vladimir S. Berdnikov, Dmitrii V. Pankin, Mikhail B. Smirnov, Evgenii V. Ubyivovk, Ivan V. Ignatiev Journal of Chemical Physics, 2024 The effect of cadmium ions introduced into fluorophosphate glass on the growth and photoluminescence (PL) of the CsPb1–xCdxBr3 perovskite nanocrystals (NCs) is systematically studied. The x-ray diffraction patterns have shown that cadmium ions are really incorporated into the NCs that results in a decrease in the lattice constant from 5.85 (x = 0) to 5.75 Å (x = 0.45). At the large cadmium content in the glass (x > 0.38), simultaneous formation of the perovskite CsPb1–xCdxBr3 NCs and the non-luminescent CsCdBr3 NCs in the hexagonal phase is found. It is also found that the lattice contraction leads to an increase in the bandgap energy and a noticeable shift of the PL band to the blue region of the spectrum (from 2.42 to 2.68 eV) with a drop in quantum yield from 85% for CsPbBr3 NCs down to 4% for CsPb0.55Cd0.45Br3 NCs. It is shown that the PL quantum yield decreases due to the formation of deep trap states, which manifest themselves as a PL band in the energy range of 1.6–2.5 eV at cryogenic temperatures. A simple model explaining the behavior of the PL band as a function of temperature in the range from 30 to 300 K is proposed.
Temperature-dependent photoluminescence dynamics of CsPbBr3 and CsPb(Cl,Br) 3 perovskite nanocrystals in a glass matrix E. V. Kulebyakina, M. L. Skorikov, E. V. Kolobkova, M. S. Kuznetsova, M. N. Bataev, D. R. Yakovlev, V. V. Belykh Physical Review B, 2024 Lead halide perovskite nanocrystals (NCs) in a glass matrix combine excellent optical properties and stability against environment. The spectral and temporal characteristics of photoluminescence from ${\mathrm{CsPbBr}}_{3}$ and CsPb(Cl,Br)${}_{3}$ nanocrystals in a fluorophosphate glass matrix are measured in a temperature range from 6 to 270 K in order to reveal factors that determine their quantum yield and recombination dynamics. At low temperatures, the recombination dynamics is characterized by three decay components with timescales on the order of 1 ns, 10 ns, and 1 $\textmu{}\mathrm{s}$. The relative contributions of the corresponding processes and their characteristic times are strongly temperature dependent. The emission intensity decreases with growing temperature. This effect is stronger in smaller NCs, which highlights the role of surface states. These experimental results are discussed on the basis of a model taking into account the NC energy structure and the presence of electron and hole surface trap states. The photoluminescence dynamics at low temperatures is dominated by charge-carrier radiative recombination and relaxation to shallow traps. At temperatures exceeding 100 K, the dynamics is affected by carrier activation to the excited states.
Electron-Phonon Interaction in Perovskite Nanocrystals in Fluorophosphate Glass Matrix M. N. Bataev, M. S. Kuznetsova, D. V. Pankin, M. B. Smirnov, S. Yu. Verbin, I. V Ignatiev, I. A. Eliseyev, V. Yu. Davydov, A. N. Smirnov, E. V. Kolobkova Semiconductors, 2024 Abstract The photoluminescence (PL) spectra of CsPbBr3 perovskite nanocrystals grown in a fluorophosphate glass matrix exhibit phonon replicas of the exciton line. The dependence of intensity of the phonon replica on its number is simulated taking into account the difference in the curvature of the excited and ground adiabatic potentials. The Raman spectra of CsPbBr3 nanocrystals are measured. Calculations based on the density functional theory is performed to obtain the spectrum of phonon states of these crystals in the orthorhombic phase. The phonon frequencies observed in the PL and Raman spectra are compared with the calculation results.
Heavy-hole-light-hole exciton system in GaAs/AlGaAs quantum wells M. N. Bataev, M. A. Chukeev, M. M. Sharipova, P. A. Belov, P. S. Grigoryev, E. S. Khramtsov, I. V. Ignatiev, S. A. Eliseev, V. A. Lovtcius, Yu. P. Efimov Physical Review B, 2022 Light-hole (lh) excitons (Xlhs) in quantum wells (QWs) are hardly studied compared with heavy-hole (hh) excitons (Xhhs), mainly due to the difficulties of their experimental observation. In this paper, a comprehensive study of both types of excitons in high-quality GaAs/AlGaAs QWs of different widths is performed. We focus on the energy positions of exciton resonances and the exciton-light interaction. The effect of mixing lhs and hhs in GaAs-based structures on these exciton characteristics is investigated. The corrections to the exciton energy due to mixing are only a fraction of millielectronvolts for wide QWs, in which the energy levels of Xhhs and Xlhs are close to each other. It is also experimentally found that the oscillator strength of Xlhs is $\ensuremath{\sim}2.5$ times less than that of Xhhs. This value noticeably deviates from the 3:1 oscillator strength ratio known for optical transitions between free electron and hole states. This deviation originates from the different squeezing of the Xlh and Xhh wave functions due to distinct values of the effective masses of the Xlh and Xhh in the heterostructure. Mixing of hh and lh valence bands is not so important.
Excitons in ZnO Quantum Wells M. N. Bataev, N. G. Filosofov, A. Yu. Serov, V. F. Agekyan, C. Morhain, V. P. Kochereshko Physics of the Solid State, 2018
