Conversion of Valence State and Coordination State of Fe in Transparent Glass‐Ceramics Containing Li2ZnSiO4 Nanocrystals. Issue 9 (20th May 2013)

• Record Type: Journal Article
• Authors: Zhuang, Yixi; Tanabe, Setsuhisa; Pickney, L.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 9(2013)
• Page Start: 2864
• Page End: 2869
• Publication Date: 2013-05-20
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12398
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12398-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Transparent glass‐ceramics containing Li₂ZnSiO₄:Fe nanocrystals were prepared by melt‐quenching method followed by post‐heat‐treatment process. The as‐prepared glasses and glass‐ceramics showed red to near‐infrared photoluminescence centered at 730 nm, ascribed to Fe³⁺ ions in tetrahedral coordination. The intensity of the photoluminescence was enhanced by two technologically simple techniques—the valence state of irons was controlled from Fe²⁺ to Fe³⁺ ions using oxidizing agents, whereas the coordination state was compulsorily converted from octahedral to tetrahedral symmetry by performing a ceramization process. The presence of Fe²⁺ ions was considered a major origin for Fe³⁺ photoluminescence quenching. Oxidation of Fe²⁺ and conversion of Fe²⁺ ions into tetrahedral symmetry contribute to suppression of energy transfer from Fe³⁺ emitters to Fe²⁺ quenching centers.</p> </abstract>