Sextuple ratiometric thermometry based on 980-nm-upconverted green fluorescence of Er ions in submicron crystals.

980-nm-upconverted 530 and 550 nm Er green fluorescence spectra of Er/Yb-codoped NaGd(WO) submicron crystals were measured in the temperature range of 298-383 K. A sextuple ratiometric thermometry is proposed. It is established on the basis of six schemes of fluorescence intensity ratio (FIR) that considers three component peaks of the 530 nm emission band and two component peaks of the 550 nm emission band, which involve electronic transitions between two Stark sublevels of Er.

[Brand-New Ge₂₀Ga₅Sb₁₀S₆₅ Prism Biosensor Based on Inverted SPR].

Based on inverted surface plasmon resonance (ISPR) a novel biosensor consisting of Ge₂₀Ga₅Sb₁₀S₆₅-palladium-graphene layer-biomolecule layer is proposed. The refractive index of biomolecule layer alters as biomolecule experience interactions, thus leading to a shift of ISPR angle. On this basis, the spectrum output of sensor is derived by transfer matrix method.