Abstract
Spectra of anomalously intense luminescence at 1.675 eV (740 nm, FWHM = 0.173 eV) have been experimentally recorded for the first time in wide-band (180–3600 nm) K2Al2B2O7 nonlinear optical crystals upon excitation in the spectral region of 4–5 harmonics of the fundamental frequency of Nd3+ radiation. It is shown by low-temperature (7–80 K) luminescence–optical spectroscopy under selective excitation by synchrotron radiation that red luminescence arises at the intracenter 4T1(4G) → 6A1(6S) transitions in Fe3+ impurity ions with a concentration below 2 ppm. The high excitation efficiency in the exciton region is due to partial overlap of the fundamental absorption edge of the crystal, where mobile excitons are excited, and wide O–Fe charge-transfer absorption band peaking at 6.5 eV. The luminescence spectrum and temperature dependence are caused by the superposition of the luminescence centers of two types (activation energies 9 and 20 meV) based on Fe3+ impurity ions located at regular Al3+ sites of two nonequivalent Al2O7 clusters.
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ACKNOWLEDGMENTS
We are grateful to L.A. Isaenko for supplying crystals for experiments.
This study was supported by the Ministry of Education and Science of the Russian Federation (basic part of the state contract, project no. 3.1485.2017/6.4), the Government of the Russian Federation (decree no. 211, contract no. 02.A03.21.0006), and, in part, HASYLAB (DESY, Hamburg), project no. 20110843 (SUPERLUMI, beamline I).
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Translated by A. Sin’kov
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Ogorodnikov, I.N., Pustovarov, V.A. The Nature of Anomalous Red Luminescence in K2Al2B2O7 : Fe Nonlinear Optical Crystals. Phys. Solid State 61, 768–772 (2019). https://doi.org/10.1134/S1063783419050226
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DOI: https://doi.org/10.1134/S1063783419050226