Abstract
LaOBr:Nd3+/Yb3+ has been prepared via a high temperature solid-state method, and near-infrared (NIR) quantum cutting (QC) luminescence in this system has been demonstrated. NIR luminescence of LaOBr:Nd3+/Yb3+ has been investigated by excitation, emission spectra and lifetime measurements, respectively. After absorption of a single 363 nm photon, downconversion (DC) occurs from the Nd3+ 4G9/2 level via the cross-relaxation process Nd3+ (4G9/2→4F3/2), Yb3+ (2F7/2→2F5/2), followed by a second energy transfer step from Nd3+ (4F3/2 level) to Yb3+ (2F5/2 level), leading to the emission of two IR photons from Yb3+, which is a promising avenue to boost the efficiency of solar cells with a twofold increase in the photon number.
©2012 Optical Society of America
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