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Improvement of quantum efficiency through Gd 3+ to Eu 3+ energy transfer in YF 3 phosphor
Author(s) -
Jaiswal Shailesh R.,
Nagpure Pankaj A.,
Omanwar Shreeniwas K.
Publication year - 2021
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.4066
Subject(s) - phosphor , luminescence , quantum efficiency , materials science , synchrotron radiation , analytical chemistry (journal) , fluorescence , ion , doping , band gap , powder diffraction , optoelectronics , chemistry , optics , crystallography , physics , organic chemistry , chromatography
This paper reports the energy transfer from Gd 3+ to Eu 3+ in YF 3 and the consequent downconversion luminescence for the YF 3 :Gd 3+ , Eu 3+ fluoride phosphor. The phosphor was synthesized using a soft chemical route, followed by a reactive atmosphere process. Because of the wide band gap in YF 3 and the correct energy site for 8 S 7/2 – 6 G J transitions of Gd 3+ ions, fluoride YF 3 doped with Gd 3+ −Eu 3+ were studied in their vacuum–ultraviolet (VUV) spectral regions. Powder X‐ray diffraction (XRD) analysis showed the structural purity of YF 3 . VUV excitation and emission properties were explored using a VUV synchrotron radiation beam line. Downconversion of energy from VUV (157 nm) to visible light with quantum efficiency c . 189% was seen. This YF 3 :Gd 3+ , Eu 3+ phosphor would be an option for mercury‐free fluorescence lamps.