Theranostics 2013; 3(4):282-288. doi:10.7150/thno.5523
Distance Dependence of Gold-Enhanced Upconversion luminescence in Au/SiO2/Y2O3:Yb3+, Er3+ Nanoparticles
1. CAS Key Laboratory of Materials for Energy Conversion; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China;
2. Hefei National Laboratory for Physical Sciences at the Microscale, Hefei 230026, P. R. China.
3. Laser Optics Research Center, Physics Department, United States Air Force Academy, CO 80840, USA.
Ge W, Zhang XR, Liu M, Lei ZW, Knize RJ, Lu Y. Distance Dependence of Gold-Enhanced Upconversion luminescence in Au/SiO2/Y2O3:Yb3+, Er3+ Nanoparticles. Theranostics 2013; 3(4):282-288. doi:10.7150/thno.5523. Available from http://www.thno.org/v03p0282.htm
We report a localized surface plasmon enhanced upconversion luminescence in Au/SiO2/Y2O3:Yb3+,Er3+ nanoparticles when excited at 980 nm. By adjusting the silica spacer's thickness, a maximum 9.59-fold enhancement of the green emission was obtained. Effect of the spacer distance on the Au-Y2O3:Yb3+, Er3+ green upconversion mechanism was numerically simulated and experimentally demonstrated. In theory for radiative decay and excitation rates, they can be largely enhanced at the spacer thicknesses of less than 70 and 75 nm, respectively, and the quenching can be caused by the non-radiative energy transferring at the distance of less than 55 nm.
Keywords: Plasmon coupling, Core/spacer/shell, Rare earth, Luminescence, Decay trace.