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Crystallization and investigation of the structural and optical properties of ce3+-doped y3−xcaxal5−ysiyo12 single crystalline film phosphors

Gorbenko V, Zorenko T, Witkiewicz-Łukaszek S, Shakhno A, Osvet A, Batentschuk M, Fedorov A, Zorenko Y (2021)

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Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 11

Article Number: 788

Journal Issue: 7

DOI: 10.3390/cryst11070788

Abstract

This work is devoted to the crystallization and investigation of the optical properties of single crystalline films (SCFs) of Ce³⁺-doped Y3−xCaxAl5−ySiyO12 garnet, where the content of Ca²⁺ and Si⁴⁺ cations varied in the x = 0.13–0.52 and y = 0.065–0.5 ranges, respectively. The SCF samples were grown using the liquid phase epitaxy technique onto Y3Al5O12 substrates from the melt solution with equimolar Ca and Si content using PbO-B2O3 flux. However, the Ca and Si concentration in Y3−xCax Al5−ySiyO12: Ce SCFs is not equal: The Ca²⁺ content was systematically larger than that of Si⁴⁺, and the Ca²⁺ excess is compensated for by the Ce⁴⁺ ion formation. The absorption, scintillation, and luminescent properties of Y3−xCaxAl5−ySiyO12: Ce SCFs with different Ca/Si concentrations were investigated and compared with the sample of YAG: Ce SCF. Due to the creation of Ce4+ ions, the as-grown Y3−xCaxAl5−ySiyO12: Ce SCFs show relatively low light yield (LY) under α–particle excitation but a fast scintillation response with a decay time in the ns range. After SCF annealing in the reducing (N2 + H2) atmosphere at T > 1000 °C, the recharging of Ce⁴⁺→Ce³⁺ ions occurs. Furthermore, the samples annealed at 1300 °C SCF possess an LY of about 40% in comparison with the reference YAG: Ce SCF and scintillation decay kinetics much closer to that of the SCF counterpart. Due to Ca²⁺ and Si⁴⁺ alloying, the Ce³⁺ emission spectra in Y3−xCaxAl5−ySiyO12 SCFs are extended to the red range in comparison with the spectra of YAG: Ce SCF. Such an extension is caused by the Ce³⁺ multicenter formation at the substitutions of both Y³⁺ and Ca²⁺ dodecahedral positions in the hosts of these mixed garnets.

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APA:

Gorbenko, V., Zorenko, T., Witkiewicz-Łukaszek, S., Shakhno, A., Osvet, A., Batentschuk, M.,... Zorenko, Y. (2021). Crystallization and investigation of the structural and optical properties of ce3+-doped y3−xcaxal5−ysiyo12 single crystalline film phosphors. Crystals, 11(7). https://doi.org/10.3390/cryst11070788

MLA:

Gorbenko, Vitalii, et al. "Crystallization and investigation of the structural and optical properties of ce3+-doped y3−xcaxal5−ysiyo12 single crystalline film phosphors." Crystals 11.7 (2021).

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