Abstract
To increase the photovoltaic efficiency of solar cells, green and red upconversion (UC) emissions produced at an excitation of 1550 nm were investigated. A drastically enhanced red UC emission was observed in near-stoichiometric crystal heavily doped with ions (Er:NSLN). Raman spectra showed that the maximum phonon energy shifted from in -doped congruent (Er:CLN) to in Er:NSLN crystal. The time decay of the transition suggested that the cluster sites () were dissociated in the Er:NSLN crystal. The visible UC luminescence converted from near infrared at the wavelength of 1550 nm was important to enlarge the solar spectrum response of solar cell.
© 2013 Optical Society of America
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