title: Near-infrared luminescence and energy transfer studies of LaOBr:Nd3+/Yb3+.
abstract: LaOBr:Nd(3+)/Yb(3+) 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:Nd(3+)/Yb(3+) has been investigated by excitation, emission spectra and lifetime measurements, respectively. After absorption of a single 363 nm photon, down-conversion (DC) occurs from the Nd(3+) 4G(9/2) level via the cross-relaxation process Nd(3+) (4G(9/2)→4F(3/2)), Yb(3+) (2F(7/2)→2F(5/2)), followed by a second energy transfer step from Nd(3+) (4F(3/2)level) to Yb(3+) (2F(5/2)level), leading to the emission of two IR photons from Yb(3+), which is a promising avenue to boost the efficiency of solar cells with a twofold increase in the photon number.
authors.affiliation: School of Materials Sciences and Technology, China University of Geosciences, Beijing, China. xiazg426@yahoo.com.cn
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Xia
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.forename: Ming
authors.initials: M
authors.lastname: Guan
authors.forename: Libing
authors.initials: L
authors.lastname: Liao