Abstract
The mechanism governing the upconversion fluorescence from the 4G5/2 level of Sm3+ ion has been investigated in zinc phosphate glass matrices under infrared (1.06 µm) laser excitation. This visible emission is centred at 590 nm and corresponds to the 4G5/2 → 6H7/2 transition. The dependence of the integrated intensity on the excitation power confirms that this emission is due to the three-photon absorption process and is in agreement with the existing theory. The intensity of the upconversion fluorescence has a cubic dependence on the excitation power. An absolute upconversion efficiency of about 10−7 was obtained for the sample doped with 0.5 wt% Sm3+ ions. A quantitative estimate of the number of photons leaving the sample was also determined.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
