Up-conversion luminescence, thermometry, and optical heating properties of Er3+ - and Yb3+ -doped K2 LaNb5 O15 submicro-particles synthesized by a simple molten salt method

Dalton Transactions : an International Journal of Inorganic Chemistry
Mengzhu LiTong Wei

Abstract

A series of Er3+- and Yb3+-doped K2LaNb5O15 (KLN:xEr3+/Yb3+) up-conversion (UC) submicro-particles have been synthesized for the first time by a simple and low-cost molten salt (MS) approach. X-ray diffraction (XRD) was performed to analyze the phase and structure, and the prepared KLN:xEr3+/Yb3+ samples exhibited a single phase tetragonal tungsten bronze (TTB) structure. The morphologies were characterized by scanning electron microscopy (SEM), and submicro-rod-like particles were obtained for all samples. Under 980 nm excitation, KLN:xEr3+/Yb3+ emitted bright green and weak red emissions which arose from the intra-4f transitions of Er3+ ions. The UC emission intensities and RR/G (the intensity ratio between red and green emissions) were disclosed to be tightly dependent on the Yb3+ ion concentration, and the involved UC luminescence mechanism was studied. Meanwhile, the slope of log I-log P plots displayed an evident reduction with a Ts (sintering temperature) increase, which was ascribed to the saturation effect coming from the competition between UC processes and linear decay. Furthermore, temperature-dependent UC behavior and temperature sensing properties of KLN:xEr3+/Yb3+ were probed based on the fluorescence intensity r...Continue Reading

References

Jan 15, 2004·Chemical Reviews·François Auzel
Jun 25, 2013·Chemical Society Reviews·Xu-dong WangRobert J Meier
Jan 2, 2014·The Journal of Physical Chemistry Letters·Robert B AndersonMary T Berry
Sep 2, 2015·The Journal of Physical Chemistry. a·Mary T Berry, P Stanley May

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