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Thermal Enhancement of Upconversion by Negative Lattice Expansion in Orthorhombic Yb 2 W 3 O 12
Author(s) -
Zou Hua,
Yang Xueqing,
Chen Bing,
Du Yangyang,
Ren Biyun,
Sun Xinwen,
Qiao Xvsheng,
Zhang Qiwei,
Wang Feng
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201910277
Subject(s) - photon upconversion , photoluminescence , materials science , orthorhombic crystal system , luminescence , activator (genetics) , optoelectronics , doping , analytical chemistry (journal) , crystal structure , crystallography , chemistry , biochemistry , chromatography , gene
Thermal quenching of photoluminescence represents a significant obstacle to practical applications such as lighting, display, and photovoltaics. Herein, a novel strategy is established to enhance upconversion luminescence at elevated temperatures based on the use of negative thermal expansion host materials. Lanthanide‐doped orthorhombic Yb 2 W 3 O 12 crystals are synthesized and characterized by in situ X‐ray diffraction and photoluminescence spectroscopy. The thermally induced contraction and distortion of the host lattice is demonstrated to enhance the collection of excitation energy by activator ions. When the temperature is increased from 303 to 573 K, a 29‐fold enhancement of green upconversion luminescence in Er 3+ activators is achieved. Moreover, the temperature dependence of the upconversion luminescence is reversible. The thermally enhanced upconversion is developed as a sensitive ratiometric thermometer by referring to a thermally quenched upconversion.