基于Sc2Mo3O12∶Dy3+负热猝灭特性的光学测温研究

Abstract： 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 Sc 2 Mo 3 O 12 ∶xDy 3+ phos• phors were synthesized via solid-state reaction.Rietveld refinement confirms pure orthorhombic phase (Pbcn) with Dy 3+ occupying Sc 3+ sites.Under 468 nm excitation， the phosphors exhibit characteristic Dy 3+ yellow emission with tunable color from yellow to yellow-green.Benefiting from the NTE host and thermally activated ［MoO 4 ］ 2-→Dy 3+ 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 S a =12%•K -1 and relative 文章编号： 1000-7032(2026)06-0997-11 收稿日期： 2026•03•17； 修订日期： 2026•03•25 基金项目：