CdSe/ZnS quantum dot intermittency in N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine (TPD)

Fluorescence-intermittency statistics of CdSe/ZnS core/shell quantum dots (QDs) are measured for the first time in TPD. Comparison to blinking behavior in PMMA reveals significant differences in the statistics such that longer on and off durations are observed for quantum dots in TPD. Further, in both matrices the on- and off-duration probability density distributions deviate from power law behavior at longer durations. The observed trends are consistent with increased accessibility to charge-stabilizing states in PMMA relative to TPD as well as the presence of an extrinsic hole density in TPD. (C) 2011 Elsevier B. V. All rights reserved.