title: Carrier-mediated 1.55 microm photoluminescence from single Er3+ center in SnO2 nanocrystals.
abstract: We report the successful incorporation of Er(3+) ions into SnO(2) nanocrystals via a solvothermal method, with a resulting Er(3+) concentration of the order of 10(19) cm(-3). Upon excitation above the SnO(2) bandgap at 300 nm, intense and well-resolved Er(3+)-related photoluminescence (PL) at 1.55 microm was observed at room temperature. The results of PL excitation and ultraviolet/visible diffuse reflectance spectra indicate that the excitation is a carrier-mediated process with an energy transfer from the SnO(2) host to Er(3+). For the above-gap excitation, only a single type of Er(3+) luminescence center located at a centrosymmetric site was identified. The near-infrared luminescence dynamics and the weak PL thermal quenching of Er(3+) were also revealed.
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Jintao
authors.initials: J
authors.lastname: Kong
authors.forename: Haomiao
authors.initials: H
authors.lastname: Zhu
authors.forename: Renfu
authors.initials: R
authors.lastname: Li
authors.forename: Wenqin
authors.initials: W
authors.lastname: Luo
authors.forename: Xueyuan
authors.initials: X
authors.lastname: Chen