Enhancement of upconversion intensity in Er3+ doped tellurite glass in presence of Yb3+
ABSTRACT TeO2–PbO glasses doped/codoped with Er3+/Er3+-Yb3+ ions have been fabricated by melting and quenching method. Efficient frequency upconversion emissions spanning from blue
to red regions corresponding to the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions, respectively, upon excitation with 976 nm diode laser radiation have been observed. The variations observed
in the intensity of whole upconversion emission spectra due to the presence of the Yb3+ ions are reported and discussed in detail.
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ABSTRACT: This article reports on the visible upconversion and temperature sensing behaviour of Er3+-Yb3+ doped/codoped TeO2-WO3 glasses prepared by a melting and quenching method. The upconversion emissions have been observed throughout the visible and infrared region upon 980 nm and 808 nm excitations and assigned suitably from different transitions of the Er3+ ion. The emission intensities have been enhanced about 5.92 and 3.99 times for most intense green band upon 980 and 808 nm excitations, respectively on codoping with Yb3+ ions. The reason behind this improvement is explained on the basis of a power dependence study and an energy level structure. The colour tunability behaviour of the codoped glass has also been investigated upon both excitations. The temperature sensing performance of the prepared glass has been studied by using the fluorescence intensity ratio technique upto 745 K. The results suggested that the present glass is a suitable candidate for making a high temperature sensor up to 690 K with a sensitivity of about 28.72×10-4 K-1.Sensors and Actuators B Chemical 06/2014; · 3.54 Impact Factor
- 02/2012; , ISBN: 978-953-51-0086-7