Crystal structure and pale‐yellow emitting properties of K3Gd1–xDyxB6O12 solid solutions. Issue 11 (4th October 2019)

• Record Type: Journal Article
• Authors: Zhang, Rui-Juan; Shi, Jian-Chao; Zhao, Dan-Dan; Han, Xiao-Yang; Deng, Ling; Cui, Xiao-Qi; Zhao, Dan
• Is Part Of: Acta crystallographica. Volume 75:Issue 11(2019)
• Page Start: 1494
• Page End: 1501
• Publication Date: 2019-10-04
• Subjects: polyborate -- luminescence -- energy transfer -- phosphor -- crystal structure -- dysprosium -- potassium; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229619013305
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : This work reports a new potassium dysprosium polyborate, K3 DyB6 O12, that can be described as a three‐dimensional framework composed of bicyclic [B5 O10 ] 5− groups and Dy 3+ and K + ions. Moreover, a series of K3 Gd1– x Dy x B6 O12 phosphors was prepared and the photoluminescence properties were investigated. Abstract : A new potassium dysprosium polyborate, K3 DyB6 O12, has been prepared via the high‐temperature molten salt method and structurally characterized by single‐crystal X‐ray diffraction analysis. The structure can be described as a three‐dimensional framework composed of isolated bicyclic [B5 O10 ] 5− groups and Dy 3+ and K + ions. The Fourier transform IR (FT–IR) and ultraviolet–visible (UV–Vis) spectra were investigated. A series of K3 Gd1– x Dy x B6 O12 phosphors was prepared and their photoluminescence properties were studied. The K3 Gd1– x Dy x B6 O12 phosphors exhibit a strong yellow emission band at 577 nm (the 4 F9/2 → 6 H13/2 transition of Dy 3+ ) under UV excitation of 275 nm (the 8 S7/2 → 6 I J transition of Gd 3+ ), suggesting the occurrence of the energy transfer Gd 3+ →Dy 3+ . The optimized doping concentration of the Dy 3+ ion was 8 mol%. We may expect that K3 Gd1– x Dy x B6 O12 is a promising pale‐yellow emission phosphor for visual displays or solid‐state lighting.