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β-NaYF 4 nanocrystal embedded glass ceramics were fabricated by a melt-quenching method with subsequent heat-treatment. Structural characterizations and spectrographic techniques were performed to verify the successful precipitation of β-NaYF 4 nanocrystals and partition of dopants. Upon excitation of 980 nm, bright green upconversion emission could be achieved in Yb 3+ , Er 3+ codoped β-NaYF 4 nanocrystal embedded glass ceramics. Furthermore, the temperature-dependent upconversion behaviour based on thermally coupled energy levels was also examined in the range of 300-773 K with the maximum relative sensitivity of 1.24% K -1 at 300 K. Accordingly, it has been proved to be a promising candidate for application in optical thermometry.

Upconversion of transparent glass ceramics containing β-NaYF4:Yb3+, Er3+ nanocrystals for optical thermometry

Upconversion of transparent glass ceramics containing β-NaYF₄:Yb³⁺, Er³⁺ nanocrystals for optical thermometry