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- W2937673920 abstract "In this work, the spectra of anomalously intense luminescence at 1.675 eV (FWHM= 0.173 eV) in wide-gap (180–3600 nm) nonlinear-optical crystals K2Al2B2O7 were observed experimentally for the first time upon excitation in the spectral region of 4–5 harmonics of the fundamental frequency of the Nd3+ radiation. Using low-temperature (7–293 K) luminescence-optical spectroscopy with selective excitation by synchrotron radiation, it was shown that red luminescence occurs at intracenter 4T1(4G)→ 6A1(6S) transitions in impurity Fe3+ ions with a concentration less than 2 ppm. The high excitation efficiency in the exciton region is due to the partial overlapping of the fundamental absorption edge of the crystal, where mobile excitons are excited, and the broad absorption band with O– Fe charge transfer with a maximum at 6.5 eV. The spectrum and temperature dependence of the luminescence are due to the superposition of two types of luminescence centers (activation energies 9 and 20 meV) based on Fe3+ impurity ions located in regular Al3+ positions of two nonequivalent Al2O7 clusters." @default.
- W2937673920 created "2019-04-25" @default.
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- W2937673920 date "2019-01-01" @default.
- W2937673920 modified "2023-10-05" @default.
- W2937673920 title "Природа аномальной красной люминесценции в нелинейно-оптических кристаллах K-=SUB=-2-=/SUB=-Al-=SUB=-2-=/SUB=-B-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- : Fe" @default.
- W2937673920 doi "https://doi.org/10.21883/ftt.2019.05.47584.14f" @default.
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