Intense orange–red emission and concentration-dependent energy transfer in PbF₂:Sm³⁺ phosphors

Chúng tôi vui mừng thông báo rằng TS. Đinh Thanh Bình và các đồng nghiệp đã xuất bản công trình có tựa đề "Intense orange–red emission and concentration-dependent energy transfer in PbF₂:Sm³⁺ phosphors" in the Journal of Alloys and Compounds.

Tóm tắt:

Sm³⁺-doped PbF₂ compounds were investigated to clarify the relationship between local coordination, radiative transitions, and concentration-dependent energy transfer mechanisms. Judd–Ofelt (J–O) analysis was performed for the PbF₂:1.0 %Sm³⁺ composition, revealing that Sm³⁺ ions occupy a predominantly ionic and structurally stable environment in the orthorhombic PbF₂ lattice, characterized by moderate Ω₂ values and an Ω₄ > Ω₆ trend favorable for electric-dipole-allowed 4f–4f transitions. Under near-UV excitation, intense orange–red emission dominated by the ⁴G₅/₂ → ⁶H₇/₂ transition is observed. With increasing Sm³⁺ concentration, luminescence quenching occurs and is governed by non-radiative energy migration rather than changes in the intrinsic radiative framework. Concentration-dependent emission behavior, photoluminescence lifetime shortening, and Dexter–Inokuti–Hirayama analysis indicates that dipole–quadrupole interactions dominate the quenching process. These results establish a coherent structure–property–mechanism correlation for Sm³⁺-activated PbF₂ phosphors and provide guidance for optimizing rare-earth-doped fluoride materials for efficient orange–red emission.