Luminescence properties of Tm3+/Yb3+ codoped lead alumina bismuth borate glasses

This paper reports on the spectroscopic properties of Yb3+ and Tm3+ codoped lead alumina bismuth borate glasses. Optical absorption spectra of these Samples were recorded at room temperature in the wavelength range 350-2000 nm. The absorption spectra exhibited the bands at 658 nm (3H6→3F2), 686 nm (...

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Bibliographic Details
Main Authors: Goud, K. Krishna Murthy, Reddy, M. Chandra Shekhar, Rao, B. Appa
Format: Conference Proceeding
Language:English
Subjects:
Absorption spectra
Aluminum oxide
Band gap
Bismuth
Energy gap
Energy transfer
Luminescence
Optical properties
Semiconductor lasers
Thulium
Upconversion
Ytterbium
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Summary:This paper reports on the spectroscopic properties of Yb3+ and Tm3+ codoped lead alumina bismuth borate glasses. Optical absorption spectra of these Samples were recorded at room temperature in the wavelength range 350-2000 nm. The absorption spectra exhibited the bands at 658 nm (3H6→3F2), 686 nm (3H6→3F3), 792 nm (3H6→3H4), 1211 nm (3H6→3H5) and 1663 nm (3H6→3F4) due to Tm3+ ions. The band at 977 nm (2F7/2→2F5/2) is due to Yb3+ ions. Optical band gap (Eopt ) and Urbach energy (ΔE) values were calculated from the spectra. It was observed that the value of optical band gap decreases with increase in the concentration of Tm3+ ions. The upconversion luminescence spectra were measured under excitation of 980 nm laser diode, and the intense blue (470 nm) and green (656 nm) emission were simultaneously observed at room temperature. A proposed upconversion mechanism involving energy transfer from Yb3+ to Tm3+ has been presented.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4947877