Study of visible emission in KTaO₃ and K_1−xLi_xTaO₃

P. Camagni Dipartimento di Fisica “A., Volta” and Istituto Nazionale di Fisica della Materia, Via Bassi 6, 27100, Pavia, Italy

P. Galinetto Dipartimento di Fisica “A., Volta” and Istituto Nazionale di Fisica della Materia, Via Bassi 6, 27100, Pavia, Italy

E. Giulotto Dipartimento di Fisica “A., Volta” and Istituto Nazionale di Fisica della Materia, Via Bassi 6, 27100, Pavia, Italy

G. Samoggia Dipartimento di Fisica “A., Volta” and Istituto Nazionale di Fisica della Materia, Via Bassi 6, 27100, Pavia, Italy

V. A. Trepakov A. F. loffe Physical & Technical Institute, 194 021, St. Petersburg, Russia; Institute of Physics, AS CR, Na Slovance 2, 182 21, Prague 8, Czech Republic

P. P. Syrnikov A. F. loffe Physical & Technical Institute, 194 021, St. Petersburg, Russia

L. Jastrabik Institute of Physics, AS CR, Na Slovance 2, 182 21, Prague 8, Czech Republic

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Abstract

Visible photoluminescence in K_1−xLi_xTaO₃ was found to have similar spectral features but a large increase of emission yield with respect to KTaO₃. Studying the temperature dependence of the phenomena and its correlation with photoconductivity, we found direct support for a process in which the emission is due to pair recombination of trapped electron and hole centers, Ta⁴⁺ and O⁻, intrinsic to the matrix.

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Study of visible emission in KTaO₃ and K_1−xLi_xTaO₃

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Study of visible emission in KTaO₃ and K_1−xLi_xTaO₃