Luminescent Materials Based on Aluminates: A Review

Revankar, S.G.; Gedekar, K.A.; Moharil, S. V.

doi:10.1002/pssa.202200346

Cited by 1 publication

(1 citation statement)

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“…The main components of WLEDs are chips and phosphors, which convert part of the chip’s radiation by photoluminescence (PL). Researchers currently study phosphors based on host matrices of various compositions and lattice symmetries, functionalized with different activators. − The activator is the luminescent center (small amounts of impurity ions in the system), and the matrix is the main part of the material. Impurities ions are introduced into the material to create levels of defects that play a crucial role in the material’s luminescent properties.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence in Cerium-Doped Fluoride Borate Crystals

et al. 2023

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Antizeolite fluoride borates LiBa 12 (BO 3 ) 7 F 4 (LBBF) doped by Ce 3+ ions demonstrate photoluminescence (PL) and hold promise for use as phosphors in white light-emitting diodes. In this study, we present the results of modeling the electronic and optical properties of Ce-containing LBBF structures where doping atoms are located at different sites of the host lattice. We also consider the presence of F-centers, which exhibit trap states located within the band gap. We further investigate the nonadiabatic excited state electronic dynamics to elucidate electron-relaxation pathways. The nonadiabatic couplings (NACs) calculations provide transition probabilities facilitated by the nuclear movement. The relaxation rates of electrons and holes are calculated using Redfield's theory of the formalism of the reduced density matrix (RDM). The PL spectra are calculated using molecular dynamics (MD) sampling and time-integrated methods along the excited state trajectory based on NACs. Mechanisms of PL in LBBF:Ce 3+ crystals are interpreted using both computational and experimental observations. This work illustrates the dependence of transition energies, intensities, and relaxation rates of Ce-containing LBBF crystals on a selection of doping sites. In addition to analysis of emission band contributed by cerium, this work allows to identify and reproduce spectral lines hypothetically corresponding to the interband and intraband transitions in F-centers of borate crystals, available in the absence of a metal center.

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Section: Introductionmentioning

confidence: 99%