Carrier-mediated 1.55 microm photoluminescence from single Er3+ center in SnO2 nanocrystals.
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.
Kong
Jintao
J
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.
Zhu
Haomiao
H
Li
Renfu
R
Luo
Wenqin
W
Chen
Xueyuan
X