Photoluminescence and thermal radiation from Eu and Al doped SiO2 for fiber-optic thermometer application

Photoluminescence and visible light thermal radiation from Eu, Al doped SiO2 (SiO2:Eu, Al) glass fiber have been studied for a fiber-optic thermometer application. Photoluminescence (PL) peaking at λ=433, 485 and 617 nm is clearly observed from SiO2:Eu, Al glass with UV excitation (λ=365 nm). Peak intensity of PL decreases with temperature form 300 to 1000 K. Visible light thermal radiation peaking at λ=660 nm is also observed from SiO2:Eu, Al glass above 1000 K. Peak intensity of visible light thermal radiation increases exponentially with temperature. Temperature can be measured based on temperature dependences of PL (below 1100 K) and visible light thermal radiation (above 1000 K) using SiO2:Eu, Al glass fiber. The hybridization of fluorescence thermometry (below 1000 K) and thermal radiation thermometry (fiber-optic pyrometer, above 1000 K) using SiO2:Eu, Al glass fiber is thought to extend the temperature range of a fiber-optic thermometer.