Enhanced Fluorescence Intermittency in Mn-Doped Single ZnSe Quantum Dots

Enhanced Fluorescence Intermittency in Mn-Doped Single ZnSe Quantum Dots Yanpeng Zhang,*,† Chenli Gan,† Javed Muhammad,† David Battaglia,‡ Xiaogang Peng,‡ and Min Xiao*,† Department of Physics, and Department of Chemistry and Biochemistry, UniVersity of... More

Enhanced Fluorescence Intermittency in Mn-Doped Single ZnSe Quantum Dots Yanpeng Zhang,*,† Chenli Gan,† Javed Muhammad,† David Battaglia,‡ Xiaogang Peng,‡ and Min Xiao*,† Department of Physics, and Department of Chemistry and Biochemistry, UniVersity of Arkansas, FayetteVille, Arkansas 72701 ReceiVed: June 29, 2008; ReVised Manuscript ReceiVed: October 28, 2008 We report detailed experimental studies of enhanced fluorescence intermittency in Mn-doped single ZnSe quantum dots. The measured intermittency statistics and its dependences on the excitation intensity and dot size indicate that the enhanced blinking might be due to the strong coupling between the multiple Mn2+ ions within a single nanocrystal. The measured statistical results are compared with a diffusion-controlled electrontransfer model, which gives the diffusion rates for the “on” and “off” time distributions. Fluorescence intermittency (or blinking) is a universal behavior of single colloidal semiconductor quantum dots ( Less