Upconversion luminescence in transparent oxyfluoride glass ceramics containing hexagonal NaErF4

JOURNAL OF ALLOYS AND COMPOUNDS

卷:798

Article

Krieke, Guna¹  Antuzevics, Andris¹  Springis, Maris¹  Rogulis, Uldis¹ 

[1] Univ Latvia, Inst Solid State Phys, 8 Kengaraga Str, LV-1063 Riga, Latvia

关键词: Upconversion;    Oxyfluoride;    Site-selective spectroscopy;    Glass ceramics;    NaErF4;   

DOI  :  10.1016/j.jallcom.2019.05.276

来源: Elsevier

【 摘 要 】

Transparent oxyfluoride glass ceramics containing hexagonal NaErF4 nanocrystals were synthesized by a heat treatment of a precursor glass obtained by the melt quenching technique. Combined X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis revealed the formation of single phase nanocrystals in the glass ceramics. The enhancement of intensity and spectral change of upconversion luminescence (UCL) confirmed the presence of Er3+ ions in the crystalline phase of the glass ceramics. Dominant energy transfer processes were identified using the rate equation formalism. Time-resolved site-selective spectroscopy studies at low temperatures were employed to elucidate the local structure of Er3+ ions in the glass ceramics and microcrystalline NaErF4. The origin of multi-site formation in hexagonal NaErF4 lattice is discussed. (C) 2019 Elsevier B.V. All rights reserved.

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