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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Enhanced up-conversion and temperature-sensing behaviour of Er
3+
and Yb
3+
co-doped Y
2
Ti
2
O
7
by incorporation of Li
+
ions
Physical Chemistry Chemical Physics, Volume 16, No. 41, Year 2014
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Description
Y2Ti2O7: Er3+/Yb3+ (EYYTO) phosphors co-doped with Li+ ions were synthesized by a conventional solid-state ceramic method. X-ray diffraction studies show that all the Li+ co-doped EYYTO samples are highly crystalline in nature with pyrochlore face centred cubic structure. X-ray photon spectroscopy studies reveal that the incorporation of Li+ ions creates the defects and/or vacancies associated with the sample surface. The effect of Li+ ions on the photoluminescence up-conversion intensity of EYYTO was studied in detail. The up-conversion study under ∼976 nm excitation for different concentrations of Li+ ions showed that the green and red band intensities were significantly enhanced. The 2 at% Li+ ion co-doped EYYTO samples showed nearly 15- and 8-fold enhancements in green and red band up-converted intensities compared to Li+ ion free EYYTO. The process involved in the up-conversion emission was evaluated in detail by pump power dependence, the energy level diagram, and decay analysis. The incorporation of Li+ ions modified the crystal field around the Er3+ ions, thus improving the up-conversion intensity. To investigate the sensing application of the synthesized phosphor materials, temperature-sensing performance was evaluated using the fluorescence intensity ratio technique. Appreciable temperature sensitivity was obtained using the synthesized phosphor material, indicating its applicability as a high-temperature-sensing probe. The maximum sensitivity was found to be 0.0067 K-1 at 363 K. © the Partner Organisations 2014.
Authors & Co-Authors
Singh, B. P.
India, Varanasi
Indian Institute of Technology Bhu Varanasi
Parchur, A. K.
India, Varanasi
Banaras Hindu University
United States, Logan
Utah State University
Ningthoujam, R. S.
India, Mumbai
Bhabha Atomic Research Centre
Ramakrishna, P. V.
India, Visakhapatnam
Andhra University
Singh, S.
India, Bilaspur
Guru Ghasidas Vishwavidyalaya
Singh, P.
India, Varanasi
Indian Institute of Technology Bhu Varanasi
Rai, S. B.
India, Varanasi
Banaras Hindu University
Maâlej, Ramzi
Tunisia, Sfax
University of Sfax
Statistics
Citations: 129
Authors: 8
Affiliations: 7
Identifiers
Doi:
10.1039/c4cp02949f
ISSN:
14639076
Research Areas
Environmental