Abstract
Photoluminescence spectra are investigated in erbium‐doped GaLaS(O) glasses. Under optical pumping by a semiconductor laser diode operating at 808 nm, the samples demonstrate intense “green” emission bands centered at around 525 and 550 nm as well as much weaker “red” emission band centered at around 664 nm. The intensities of “green” and “red” emission bands are investigated as a function of pumping intensity. The cascade mechanism of generation of radiation from higher lying levels of the 4f‐shell ions is discussed to interpret these experimental results and the theoretical description of the phenomenon is developed.
Highlights
Rare-earth doped chalcogenide glasses demonstrating effective up-conversion are attractive for many practical applications including up-conversion fiber optical lasers[1], up-converters for solar cells to convert Sun’s IR radiation into visible[2] and others
The theoretical description of up-conversion intensity as a function of excitation intensity has been offered. It is based on a solution of a system of rate equations taking into account three up-conversion transitions
We offer a simple phenomenological method to calculate the PL intensity by using the appropriate functions
Summary
Rare-earth doped chalcogenide glasses demonstrating effective up-conversion are attractive for many practical applications including up-conversion fiber optical lasers[1], up-converters for solar cells to convert Sun’s IR radiation into visible[2] and others. In the present paper we investigate the intense visible green and red up-conversion in gallium lanthanum sulphide-oxide glass GaLaS(O) doped with trivalent Er3+ erbium ions[3]. These glasses may demonstrate high efficiency up-conversion as well as high quantum yield of “regular” photoluminescence (PL) presumably due to insignificant non-radiative losses which are typical for these glasses. The method, which is developed in the present paper, is used to describe the experimentally observed spectra of up-conversion PL in Er3+ ions embedded in a gallium lanthanum sulphide-oxide glass
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