Doping location-dependent energy transfer dynamics in Mn-doped CdS/ZnS nanocrystals. Academic Article uri icon

abstract

  • Dynamics of energy transfer and charge carrier localization in Mn-doped CdS/ZnS core/shell nanocrystals correlated with doping location and concentration are studied via transient absorption measurement of exciton relaxation dynamics. The strong dependence of exciton-Mn energy transfer rate on doping location was directly resolved in the transient bleach recovery and electron intraband absorption data by using layer-by-layer synthesized Mn-doped nanocrystals. With 1.2 nm decrease in doping radius in the ZnS shell, energy transfer rate increases by 6 fold. We identified that hole trapping is the major competing process that inhibits the energy transfer in Mn-doped CdS/ZnS nanocrystals. From the branching ratio of the energy transfer and hole trapping, combined with luminescence quantum yield measurement, we also obtained doping location-dependent radiative relaxation quantum yield of Mn(2+) ions that is as high as 0.95.

published proceedings

  • ACS Nano

altmetric score

  • 3

author list (cited authors)

  • Chen, H., Maiti, S., & Son, D. H.

citation count

  • 139

complete list of authors

  • Chen, Hsiang-Yun||Maiti, Sourav||Son, Dong Hee

publication date

  • January 2012