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 LiNbO3 crystal heavily doped with Er3+ ions (Er:NSLN). Raman spectra showed that the maximum phonon energy shifted from 631cm1 in Er3+-doped congruent LiNbO3 (Er:CLN) to 871cm1 in Er:NSLN crystal. The time decay of the S3/24I15/24 transition suggested that the Er3+ cluster sites (ErLi2+-ErNb2) 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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