Structural transformations and spectroscopic properties of Ni-doped magnesium aluminosilicate glass-ceramics nucleated by a mixture of TiO2 and ZrO2 for broadband near-IR light emission

JOURNAL OF ALLOYS AND COMPOUNDS

卷:780

Article

Dugue, Aymeric¹  Dymshits, Olga²  Cormier, Laurent¹  Loiko, Pavel³  Alekseeva, Irina²  Tsenter, Marina²  Bogdanov, Kirill³  Lelong, Gerard¹  Zhilin, Alexander² 

[1] Sorbonne Univ, Museum Natl Hist Nat, IMPMC, IRD,CNRS,UMR 7590, 4 Pl Jussieu, F-75005 Paris, France

[2] Vavilov State Opt Inst, 36 Babushkina Str, St Petersburg 192171, Russia

[3] Univ ITMO, 49 Kronverkskiy Pr, St Petersburg 197101, Russia

关键词: Glass-ceramics;    Spinel;    Nickel;    Absorption;    Luminescence;    Heat-treatment;   

DOI  :  10.1016/j.jallcom.2018.11.247

来源: Elsevier

【 摘 要 】

Ni:MgAl2O4 spinel shows a reversible random Ni2+ site redistribution with increasing temperature. With the aim of determining the influence of the structure evolution induced by heat-treatment on the nature of luminescence centers in NiO-doped spinel-based magnesium aluminosilicate glass-ceramics nucleated by a mixture of TiO2 and ZrO2, the detailed spectroscopic study of the initial glass during its heat-treatments at increasing and decreasing temperatures has been performed and accompanied by an XRD analysis and Raman spectroscopy. The initial glass was X-ray amorphous. Its optical spectrum is mainly formed by absorption of Ni-[5](2+) sites with a small amount of Ni-[4](2+) ones. Crystals of the nucleating catalyst, ZrTiO4, about 4 nm in size, appear during heat-treatment at 800 degrees C, while the absorption spectrum of Ni2+ ions remains near unchanged. At 850 degrees C, spinel crystals with size of about 6 nm precipitate, which is accompanied by a broadband luminescence in the near-IR centered at 1330 nm with a bandwidth of 380 nm. At 950 degrees C, there is a slight reduction in intensity of absorption bands attributed to Ni-[6](2+), which can be explained by a tendency toward random Ni 2+ site redistribution with increasing temperature. A decrease in the amount of the Ni-[6](2+) luminescent centers is not accompanied by a decrease in the luminescence intensity because of the increased size of spinel crystals. Additional lowtemperature heat-treatment does not lead to a redistribution between Ni-[6](2+) and Ni-[4](2+) sites in spinel crystals in favor of Ni-[6](2+) ones. An increase of the luminescence intensity after low-temperature heat-treatment is associated with additional spinel crystallization. (C) 2018 Elsevier B.V. All rights reserved.

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