Thermally Enhanced Upconversion Luminescence in Sc2Mo3O12:Yb/Er Thin Film Toward Versatile and High-Sensitivity Luminescent Temperature Sensing

• • 42-fold thermal enhancement of green upconversion luminescence from 300 to 560 K in Sc2Mo3O12:Yb/Er thin film, enabling reliable operation in high-temperature environments where conventional sensors fail due to thermal quenching. • • 11.3 Å3 reduction in cell volume via anisotropic NTE along a- and c-axes amplifies Yb3+→Er3+ energy transfer (kET ∝ R−6), directly countering thermal quenching and boosting signal intensity for high-sensitivity thermometry. • • 358% extension of Er3+ lifetimes due to symmetry-breaking distortions that suppress nonradiative 2H11/2 → 4F9/2 relaxations, providing a lifetime-based sensing modality with maximum relative sensitivity (Sr) of 1.28% K−1, surpassing Boltzmann-limited approaches. • • Record relative sensitivity (Sr) of 4.33% K−1 at 300 K achieved through multi-modal thermometry, with sub-200 nm thickness and SiO2/Si compatibility, enabling on-chip integration for high-resolution thermal mapping in quantum devices, aerospace diagnostics, and wearable sensors.