Journal
SOLID STATE SCIENCES
Volume 112, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2020.106444
Keywords
Tellurite glass; Er3+ ions; Glass-ceramics; Luminescence
Funding
- FAPESP (Brazil) [2013/24064-8]
- CNPq [421900/2018-0]
- CNPq/UFRPE [10089]
- FACEPE [BIC-1127-3.03/19, IBPG-0898-3.03/19]
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Er3+-doped zinc tellurite glass and glass-ceramic were prepared by melt-quenching technique and heat-treatments at crystallization temperatures. The near-infrared emission band width increased and lifetime decreased after heat-treatment, with a red-shift observed in upconversion emission bands. The mechanism behind these changes may involve energy transfer between Er3+ ions in the crystalline phase.
Er3+-doped zinc tellurite glass and glass-ceramic are prepared by simple melt-quenching technique and subsequent heat-treatments at two defined crystallization temperatures. The heat-treated sample at 460 degrees C converts to an opaque glass-ceramic with the formation of mainly Zn2Te3O8 and TeO2 crystalline phases. There is no peak observed corresponding to the ZnTeO3 phase. The effective bandwidth of the near-infrared emission band of Er3+ ions at around 1.5 mu m increases from 65 nm to 89 nm after exposing the sample to heat-treatment owing to the formation of different symmetry sites around Er3+ ions. The lifetime of this band decreases from 2.49 to 1.72 ms. The upconversion emission bands in ceramized sample show a red-shift, while the green to red upconversion intensity ratio decreases from 3 to 0.6, respectively, for glass and glass-ceramic samples. The mechanism behind this observation is discussed by possible energy transfer between Er3+ ions in the crystalline phase.
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