Bright Type II Quantum Dots

Christina M. Tyrakowski, Armen Shamirian, Clare E. Rowland, Hongyan Shen, Adita Das, Richard D. Schaller, Preston T. Snee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


It is a paradigm that the exciton splitting characteristics of type II quantum dots (QDs) result in low quantum yield materials. However, reported herein is the synthesis of ZnSe/CdS/ZnS type II QDs with quantum yields as high as 61%. Most interesting is the fact that the enhancement in brightness is due to an increase in the radiative rate, rather than the suppression of surface trap-related nonradiative processes, which was found to be minimal. These QDs have been water-solubilized using two different methods and retain a substantial fraction of their brightness. The water-soluble type II QDs were conjugated to a dye to examine their potential as fluorescence resonance energy transfer (FRET) donors. A significant FRET efficiency of 61 ± 3% was measured using time-correlated single photon counting, which demonstrates the potential for these materials to be used in FRET-based chemical and biological sensing applications.

Original languageEnglish (US)
Pages (from-to)7276-7281
Number of pages6
JournalChemistry of Materials
Issue number21
StatePublished - Nov 10 2015

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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