Speaker
Dr
Anurag Pandey
(University of the Free State)
Description
1. Introduction
Lanthanides activated luminescent materials having increasing interest among researchers owing to its broad area of applications in photonic, sensing, security and biomedical fields [1]. Rare earth doped glasses are one of the best luminescent solids because of their multifunctional uses from daily live to scientific applications. Tellurite glasses are a better choice for preparing luminescent glasses rather than other oxides due to its low phonon frequency characteristics [2]. Triply ionized holmium is a good candidate for an activator due to its strong emission in the green region and dual mode emitting properties [3]. Several glass synthesis techniques are in used but the melt-quenching technique is the simplest and cheapest method for the preparing of glasses [2].The present work is focused upon luminescence emission from the Ho3+ doped TeO2-ZnO glass prepared by a melting and quenching method.
2. Results
The amorphous nature of the prepared glass was checked by X-ray diffraction patterns of the prepared glass while the thermal behavior was discussed on the basis of thermogravimetric analyses. The luminescence property of the glass was determined via absorption and photoluminescence emission spectra. Fig. 1 shows the photoluminescence emission spectra of the prepared glass upon 980 and 488 nm excitations. The results suggest a tunable two photon upconversion emission and intense green emitting downconversion emission from the sample which is also explained via a suitable energy level structure diagram. Thus dual mode emission (up and down-conversion) observed from the prepared glass is useful in lighting and enhancing the efficiency of solar panels.
Fig.1: Schematic diagram of dual mode emission from the Ho3+ doped TeO2-ZnO glass.
3. References
[1]A. Pandey, S. Som, V. Kumar, V. Kumar, K. Kumar, V. K. Rai, and H. C. Swart. Sens. Actuators B 202 (2014) 1305.
[2] D. K. Mohanty, V. K. Rai, Y. Dwivedi and S. B. Rai. Appl. Phys. B 104 (2011) 233.
[3] A. Pandey, V. K. Rai. Dalton Trans. 42 (2013) 11005.
Acknowledgements
This research is supported by the South African Research Chairs Initiative of the Department of Science and Technology (84415) and National Research Foundation of South Africa. The financial support from the University of the Free State is also acknowledged.
At what level of studies are you currently? (Hons/MSc/PhD)
PhD
Please provide the name and email address of your supervisor.
Prof. H. C. Swart (hendrikanita@gmail.com)
Primary author
Dr
Anurag Pandey
(University of the Free State)
Co-author
Prof.
H C Swart
(University of the Free State)
