Optical properties of ytterbium doped oxyfluoride glass-ceramics - concentration and temperature dependence studies for optical refrigeration applications
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2021
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Oxyfluoride glass-ceramics (GCs) doped with lanthanides have recently attracted much attention as a novel
optoelectronic material candidate for optical refrigeration. In this study, the optical properties of highly transparent (~90% in the near infrared region) ytterbium doped germanate and aluminosilicate oxyfluoride glass
ceramics with different rare earth ion concentrations varying from 0.5 to 3.0 mol % synthesized by the conventional melt quenching technique have been investigated to determine and compare their potential for optical
refrigeration applications. The photoluminescence (PL) emission spectra at different temperatures (25◦
C–200 ◦C)
were measured using different excitation wavelengths varying from 920 nm to 1030 nm in order to understand
the behaviour of Stokes and anti-Stokes emission in all the glass-ceramics. The influence of ytterbium content is
studied and found to substantially affect the PL emission and quantum yield and thus affect the cooling/heating
characteristics. The highest intensity of anti-Stokes emission from the GC samples was observed in the composition containing 1.5 mol % or 2.0 mol % of Yb3+. Experiments monitoring the sample temperature at varying
excitation wavelength between 1020 and 1030 nm demonstrates that the 1.5 mol % or 2.0 mol % Yb3+ concentrations are the most suitable for laser cooling applications.
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Ytterbium, Oxyfluoride glass-ceramics, Photoluminescence, Quantum yield, Fiber bragg grating, Anti-Stokes emission
Citação
THOMAS, Jyothis et al. Optical properties of ytterbium doped oxyfluoride glass-ceramics - concentration and temperature dependence studies for optical refrigeration applications. Journal of Luminescence, Amsterdam, v. 238, e118278, 2021. DOI: 10.1016/j.jlumin.2021.118278. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022231321003951. Acesso em: 1 fev. 2024.