A two-step synthetic route to GdOF:Ln3+ nanocrystals with multicolor luminescence properties. Issue 6 (24th December 2015)

• Record Type: Journal Article
• Authors: Shao, Baiqi; Feng, Yang; Jiao, Mengmeng; Lü, Wei; You, Hongpeng
• Is Part Of: Dalton transactions. Volume 45:Issue 6(2016)
• Page Start: 2485
• Page End: 2491
• Publication Date: 2015-12-24
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt03708e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : GdOF:Ln 3+ (Ln = Eu, Tb, Eu/Tb, Ce/Tb, Yb/Er, and Yb/Tm) nanocrystals with multicolor emissions have been synthesized by a novel topotactic transformation route. Abstract : GdOF:Ln 3+ (Ln = Eu, Tb, Eu/Tb, Ce/Tb, Yb/Er, and Yb/Tm) nanocrystals with a hexagonal prism morphology have been readily synthesized by a novel topotactic transformation route. The Gd(OH)2 F precursor was first synthesized and structurally analyzed by the Rietveld refinement method. It has been found that the Gd(OH)2 F precursor was formed by a novel type of ion-exchange from the brucite-like Gd2 (OH)5 NO3 ·0.9H2 O (LGdH). Such an ion-exchange behavior is different from the traditional case for the layered double hydroxides (LDHs) in which the intercalated anions are exchanged by the external ions. The detailed structural analysis showed that GdOF prefered [0001] epitaxial growth direction of Gd(OH)2 F due to the structural matching of [0001]Gd(OH)2 F//[110]GdOF. Furthermore, the potential application of the as-prepared nanocrystals as phosphors is emphasized by demonstrating strong multicolor emissions including both down-conversion and upconversion, and energy transfer (Ce–Tb) processes by GdOF:Ln 3+ in detail. Our nonorganic green synthetic strategy based on the novel ion-exchange for the LDHs may enrich the synthetic methodology for nanomaterials.