Journal
JOURNAL OF LUMINESCENCE
Volume 192, Issue -, Pages 757-760Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2017.08.009
Keywords
Photon upconversion; Optical glasses; Power dependence; Energy transfer
Categories
Funding
- South African Research Chairs Initiative of the Department of Science and Technology [84415]
- National Research Foundation of South Africa [93214]
- University of the Free State
- DST New Delhi, India [DST/INSPIRE/04/2015/001497]
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This article reports on the frequency upconversion property of yellow light emitting Ho3+-Yb3+ embedded tungsten tellurite (TeO2-WO3) glass prepared by the famous melt-quench technique. Holmium activated TeO2WO3 glass gives efficient visible and near-infrared upconversion luminescence upon 980 nm excitation, which improved via the incorporation of Yb3+ ions. The upconversion process was examined by a pump power dependence study that revealed the involvement of a single photon for upconversion emission around 886 nm whereas two pump photons needed for the other emissions. The observed single and/or two photon upconversion feature is discussed with the help of a luminescence decay study and energy level diagram of the embedded ions.
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