Premium
Effect of Bi 3+ addition on the upconversion luminescence properties of NaYbF 4 :Er
Author(s) -
Agarwalla Sandeep K.,
Ruz Priyanka,
Mohanty Jyotirmayee,
Sridhar G.,
Sudarsan V.
Publication year - 2020
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.3746
Subject(s) - luminescence , photon upconversion , phosphor , photoluminescence , materials science , rietveld refinement , analytical chemistry (journal) , ion , quenching (fluorescence) , spectroscopy , fourier transform infrared spectroscopy , erbium , crystal structure , doping , chemistry , crystallography , optoelectronics , fluorescence , optics , physics , organic chemistry , chromatography , quantum mechanics
In this study, Bi 3+ incorporation in NaYbF 4 :Er lattice and its influence on upconversion luminescence properties have been investigated in detail using techniques such as temperature‐dependent luminescence, Fourier transform infrared spectroscopy and X‐ray diffraction (XRD). The study was carried out to develop phosphors with improved upconversion luminescence. From photoluminescence and lifetime measurements it is inferred that luminescence intensity from NaYbF 4 :Er increases with Bi 3+ addition. The sample containing 50 at.% Bi 3+ ions exhibited optimum upconversion luminescence. Increased distance between Yb 3+ –Yb 3+ and Er 3+ –Er 3+ due to Bi 3+ incorporation into the lattice and associated decrease in the extent of dipolar interaction/self‐quenching are responsible for increase in lifetime values and luminescence intensities from Er 3+ ions. Incorporation of Bi 3+ into NaYbF 4 :Er lattice reduced self‐quenching among Yb 3+ –Yb 3+ ions and this facilitated energy transfer from Yb 3+ to Er 3+ . This situation also explains decrease in the extent of temperature‐assisted quenching of emission from thermally coupled 2 H 11/2 and 4 S 3/2 levels of Er 3+ . Based on Rietveld refinement of XRD patterns it was confirmed that a maximum of 10 at.% of Bi 3+ added was incorporated into the NaYbF 4 :Er lattice and the remaining complex co‐exists as a BiOF phase. These results are of significant interest in the area of development of phosphors based on Yb 3+ –Er 3+ upconversion luminescence.