基于Sc2Mo3O12:Dy3+负热猝灭特性的光学测温研究OA

Negative thermal expansion(NTE)matrices offer an effective strategy to suppress thermal quenching of rare-earth luminescence for high-sensitivity optical thermometry.Herein,a series of NTE Sc2Mo3O12:xDy3+phos-phors were synthesized via solid-state reaction.Rietveld refinement confirms pure orthorhombic phase(Pbcn)with Dy3+occupying Sc3+sites.Under 468 nm excitation,the phosphors exhibit characteristic Dy3+yellow emission with tunable color from yellow to yellow-green.Benefiting from the NTE host and thermally activated[MoO4]2-→Dy3+en-ergy transfer,an anomalous negative thermal quenching is observed(303～393 K),where emission intensity increas-es with temperature.Based on this characteristic,we constructed two luminescence intensity ratio(LIR)thermomet-ric modes:a single-emission-center non-thermally coupled mode(with absolute sensitivity Sa=12％·K-1 and relative sensitivity Sr=0.45％·K-1 at 513 K)and a dual-excitation non-thermally coupled mode(with Sa=1.38％·K-1 and Sr=0.77％·K-1 at 513 K).The material exhibits excellent thermal cycling reversibility.Integrating NTE synergy,anoma-lous thermal enhancement,and high sensitivity,Sc2Mo3O12:xDy3+shows great promise for high-temperature optical thermometry.