Structure, Delamination and Luminescence of Layered Dysprosium Hydroxides and the Generation of White Light with 2D Crystals. Issue 1 (20th January 2016)

• Record Type: Journal Article
• Authors: Wang, Xinying; Feng, Pingping; Zhao, Yushuang; Li, Ji‐Guang; Yang, Xiaojing
• Is Part Of: ChemistrySelect. Volume 1:Issue 1(2016)
• Page Start: 17
• Page End: 22
• Publication Date: 2016-01-20
• Subjects: 2-dimensional crystal -- dysprosium -- layered rear-earth hydroxide -- photoluminescence -- white light; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201500012
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Layered dysprosium hydroxides intercalated with dodecyl sulfate ions (DS − LDyHs) have been synthesized using homogenous precipitation technique. Unlike the previously reported DS − intercalated layered europium hydroxides (DS − ‐LEuHs) and layered terbium hydroxides (DS − ‐LTbHs), the resultant DS − ‐LDyHs have mixed host layers of m=1 and m=2 according to the general formula of Dy2 (OH)6‐m (A x− )m/x ⋅nH2 O. Due to charge difference, the m=1 and 2 types of layers have different basal spacings of ∼28 and ∼34 Å, corresponding to a monolayer and an alternating antiparallel arrangements of DS − in the interlayers, respectively. Unlike their precursors, the 2D crystals exhibit strong 4 F9/2 → 6 H13/2 hypersensitive emissions of Dy 3+, making them more applicable to the generation of white‐bluish lights. The nanosheets also have longer fluorescence lifetime than precursor for 480 nm emission of Dy 3+ . Colloidal hybrids were prepared by mixing a suspension of the nanosheets of DS − ‐LDyHs, DS − ‐LEuHs and DS − ‐LTbHs to achieve color‐tuning in the white‐light region under excitations at 284, 318, and 377 nm. Abstract : Color‐tuning within the white‐light region was achieved by exciting the colloidal hybrids of nanosheets (NS(Dy), NS(Eu) and NS(Tb)) delaminated from layered rare‐earth hydroxides (LRHs) at 284, 318, and 377 nm.