Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 15, Pages 7844-7852Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp06755h
Keywords
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Funding
- NSFC (National Natural Science Foundation of China) [11774042, 11704056, 51772159]
- Fundamental Research Funds for the Central Universities [3132019338]
- China Postdoctoral Science Foundation [2016M591420]
- Natural Science Foundation of Zhejiang Province [LZ17E020001]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2018KF02]
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The optical transition properties of trivalent rare earth (RE3+) doped luminescent materials have received extensive attention. The Judd-Ofelt theory is an effective tool for exploring the optical transition properties for the 4f-4f transitions of lanthanides. The aim of this work is to discover the effect of Er3+ concentration and different Ln(3+) ions on the Judd-Ofelt parameters in LnOCl:Er3+ (Ln = Y, La, Gd) phosphors. Oxychloride LnOCl:Er3+ (Ln = Y, La, Gd) phosphors were produced via a single displacement reaction technique. The Judd-Ofelt calculation procedure for RE3+ doped powders was modified and then adopted to obtain the Judd-Ofelt parameters of Er3+ in the studied phosphors. Meanwhile, a new route for examining the Judd-Ofelt calculation quality was proposed and used. It was found that the Er3+ doping concentration slightly affects the optical transition properties of Er3+ in YOCl and LaOCl, but greatly affects the optical transition properties in GdOCl. Moreover, it was also found that the optical transition properties of Er3+ depend also on Ln(3+) (Ln = Y, La, Gd) though the crystal structure of these compounds is similar. The Judd-Ofelt parameters of Er3+ are the smallest in LaOCl:Er3+, medium in YOCl:Er3+, but the biggest in GdOCl:Er3+ when the doping concentration is the same.
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