Spectra and luminescence kinetics of congruent LiNbO3:Er crystals in the temperature range 80-420 K
Skvortsov A. P. 1, Dukin A. A. 1, Pevtsov A. B. 1, Starukhin A. N.1, Reznitsky A. N. 1
1Ioffe Institute, St. Petersburg, Russia
Email: a.skvortsov@mail.ioffe.ru
In the temperature range 80-420 K the spectra and kinetics of photoluminescence (PL) of congruent LiNbO3 : Er crystals were investigated under excitation by a laser at λ=405 nm. The PL spectrum of the LiNbO3 : Er crystal in the visible wavelength range includes four multiplets with maxima at 413, 526, 551, and 660 nm. It was found that at T=300 K the luminescence decay time (tauPL at wavelengths 526 and 551 nm is ~27 μs, while the band with a maximum at 413 nm decays faster at 1 μs, which correlates with numerous literature data. At the same time, tauPL in the 660 nm region was 33 μs, which is almost 30 times longer than previously published values. Possible reasons for the observed difference are discussed. Keywords: spectroscopy, luminescence, lithium niobate, erbium.
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