Site selective spectroscopy in BaYF5:RE3+ (RE = Eu, Sm) nano-glass-ceramics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:635

Article

del-Castillo, J.¹  Yanes, A. C.¹  Abe, S.^2,3  Smet, P. F.^2,3 

[1] Univ La Laguna, Dept Fis, E-38206 Tenerife, Spain

[2] Univ Ghent, Dept Solid State Sci, LumiLab, B-9000 Ghent, Belgium

[3] Univ Ghent, Ctr Nano & Biophoton NB Photon, B-9000 Ghent, Belgium

关键词: BaYF5 nanocrystals;    Rare-earth ions;    Sol-gel method;    Glass-ceramics;    Luminescence;   

DOI  :  10.1016/j.jallcom.2015.01.244

来源: Elsevier

【 摘 要 】

Trivalent rare-earth (RE = Eu, Sm) doped transparent nano-glass-ceramics comprising BaYF5 nanocrystals were successfully obtained by appropriate heat-treatment of the corresponding precursor sol-gel glasses. Their structural and spectroscopic properties were investigated and compared with those for Eu3+-doped-BaYF5 nanocrystals prepared by a solvothermal method. X-ray Diffraction, Transmission Electron Microscopy and Energy Dispersive X-ray Spectroscopy measurements confirmed the distribution of BaYF5 nanocrystals in the glass matrix, presenting a cubic phase structure with space group Fm-3m. In order to achieve a further structural characterization, the luminescence properties of the Eu3+ and Sm3+ dopants were also used as sensitive probes. The reduction in the emission intensities of hypersensitive transitions D-5(0) -> F-7(2) and (4)G(5/2) -> H-6(9/2) for Eu3+ and Sm3+ ions respectively, along with time-resolved measurements, confirm the distribution of a significant fraction of RE ions into the fluoride nanocrystal environment. These results suggest that BaYF5 nano-glass-ceramics doped with Eu3+ or Sm3+ can be considered as potential red-emitting phosphors for the development of white LEDs under near UV excitation. (C) 2015 Elsevier B.V. All rights reserved.

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