NaYF4:Yb,Tm@CsPbBr3异质结构制备与发光性能OA

To address the limitations of conventional rare-earth-doped perovskites,including unidirectional energy transfer,restricted emission modes,and weak interfacial coupling in physically mixed systems,this study reports the fabrication of embedded NaYF4:Yb,Tm@CsPbBr3 heterostructure nanocrystals,achieving efficient green emission under dual excitation at 365 nm and 980 nm.This system achieves two key advances:first,the establishment of an energy transfer pathway from rare-earth ions to the perovskite,wherein Yb3+sensitizes Tm3+under 980 nm near-infra-red excitation and efficiently transfers energy to the perovskite emission center via energy level matching;second,the adoption of an embedded hybrid structure that ensures tighter interfacial coupling compared to physical mixtures.Luminescence decay curves and transient absorption(TA)spectroscopy confirm that this architecture suppresses de-fect-mediated nonradiative recombination and significantly prolongs carrier lifetime.Temperature-dependent PL stud-ies reveal that at 320 K,the heterostructure retains 48％of its emission intensity,markedly higher than 34％for pure CsPbBr3,demonstrating enhanced thermal stability.This design provides a novel strategy for interface engineering and dual-mode emission in rare-earth-doped perovskite composites.