Thermal Enhancement of Upconversion by Negative Lattice Expansion in Orthorhombic Yb2W3O12

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  • Hua Zou
  • Bing Chen
  • Xinwen Sun
  • Xvsheng Qiao
  • Qiwei Zhang


Original languageEnglish
Pages (from-to)17255-17259
Journal / PublicationAngewandte Chemie - International Edition
Issue number48
Online published15 Sept 2019
Publication statusPublished - 25 Nov 2019


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 Yb2W3O12 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 Er3+ 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.

Research Area(s)

  • energy transfer, photoluminescence, thermometry, upconversion