Abstract
High quality Er3+/Tm3+:LiYF4 single crystals were grown by a Bridgman method. The absorption spectra and luminescent properties of the crystals were studied to characterize the effect of Tm3+ on the spectroscopic properties upon excitation of an 800 nm laser diode. The broaden 1.5 μm and the enhanced 2.7 μm emission were observed in the Er3+/Tm3+ co‐doped LiYF4 single crystals. Meanwhile, the up‐conversion and 1.5 μm emission intensities from Er3+ decrease with increasing the ratio of Tm3+ to Er3+. The energy transfer processes between Tm3+ and Er3+ in the Er3+/Tm3+ co‐doped samples were analyzed. The energy transfer efficiency ηETE from Er3+ to Tm3+ is calculated. The highest ηETE of 65.30% for the sample with 0.296 mol% of Er3+, 0.496 mol% of Tm3+ concentration was obtained. The present work indicates that Er3+/Tm3+ co‐doped LiYF4 single crystal can be a promising material for the potential application in infrared devices.
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