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Preparations, Structures and Luminescence Properties of Penta‐rare‐earth Incorporated Tetravacant Dawson Selenotungstates and Their Ho 3+ /Tm 3+ Co‐doped Derivatives
Author(s) -
Zhang Yan,
Liu YiFan,
Xu Xin,
Chen LiJuan,
Zhao JunWei
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202000131
Subject(s) - luminescence , ion , fluorescence , spectroscopy , analytical chemistry (journal) , doping , chemistry , energy transfer , emission spectrum , crystallography , materials science , physics , spectral line , optoelectronics , organic chemistry , chromatography , quantum mechanics , astronomy , molecular physics
A family of penta‐rare‐earth incorporated tetravacant Dawson selenotungstates [H 2 N(CH 3 ) 2 ] 10 H 3 [SeO 4 RE 5 (H 2 O) 7 (Se 2 W 14 O 52 ) 2 ] ⋅ 40H 2 O [RE=Ho 3+ ( 1 ), Er 3+ ( 2 ), Tm 3+ ( 3 ), Tb 3+ ( 4 )] were synthesized. It should be noted that a penta‐RE [SeO 4 RE 5 (H 2 O) 7 ] 11+ central core connecting two tetra‐vacant Dawson‐type [Se 2 W 14 O 52 ] 12− subunits generates a dimeric assembly of [SeO 4 RE 5 (H 2 O) 7 (Se 2 W 14 O 52 ) 2 ] 13− in the structures of 1 – 4 . Meanwhile, a class of Ho 3+ /Tm 3+ co‐doped derivatives based on 1 with a Ho 3+ /Tm 3+ molar ratio of 0.75:0.25–0.25:0.75 were also prepared and characterized by energy‐dispersive spectroscopy (EDS) analyses. Moreover, their luminescence properties were systematically investigated, which indicate that Tm 3+ ions can sensitize the emission of Ho 3+ ions in the visible region and prolong the fluorescence lifetime of Ho 3+ ions to some extent. Energy transfer from Tm 3+ ions to Ho 3+ ions was probed by time‐resolved emission spectroscopy (TRES), and the CIE 1931 diagram has been applied to evaluate all possible luminescence colors.