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Structure, Delamination and Luminescence of Layered Dysprosium Hydroxides and the Generation of White Light with 2D Crystals
Author(s) -
Wang Xinying,
Feng Pingping,
Zhao Yushuang,
Li JiGuang,
Yang Xiaojing
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201500012
Subject(s) - dysprosium , materials science , layered double hydroxides , luminescence , phosphor , ion , europium , fluorescence , crystallography , hydroxide , analytical chemistry (journal) , inorganic chemistry , chemistry , optics , optoelectronics , organic chemistry , chromatography , physics
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 Dy 2 (OH) 6‐m (A x− ) m/x ⋅nH 2 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 F 9/2 → 6 H 13/2 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.