Quantum dot and π -conjugated molecule hybrids: Nanoscale luminescence and application to photoresponsive molecular electronics

Yoon Deok Han, Yong Baek Lee, Sungyeoun Park, Sumin Jeon, Arthur J. Epstein, Ji Hee Kim, Jeongyong Kim, Kwang Sup Lee, Jinsoo Joo

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Hybrid nanoparticles (NPs) consisting of an n-type CdSe/ZnS quantum dot (QD) as a core and p-type π -conjugate molecules as a shell were fabricated, and their nanoscale photoluminescence (PL) and photoresponsive molecular electronic characteristics were investigated. π-Conjugated macromolecular dioctyloxybenzodithiophene-based polythiophene (P3000) or a single carbazole (CB) molecule with insulating molecular blocks were attached to the QD surface. The nanoscale PL characteristics for the single QD were drastically changed through close contact with P3000 owing to energy and charge transfer effects. However, for the hybrid QD-CB NP, the PL of the QD was dominant because of weak energy transfer resulting from the relatively longer insulating molecular block between the QD and the CB molecule. From time-resolved PL spectra, the exciton lifetimes of the QD in the hybrid QD-P3000 and QD-CB NPs were clearly different because of a variation in the energy transfer rate. The photocurrents of the single hybrid QD-P3000 NP were considerably higher and actively responded to both forward and reverse biases due to the energy and charge transfer effects, while those of the single QD-CB NP exhibited diode characteristics. The QD-based hybrids show distinct nanoscale PL features and photoresponsive molecular electronic characteristics depending on the structures of π -conjugated molecules.

Original languageEnglish
Article numbere103
JournalNPG Asia Materials
Issue number6
Publication statusPublished - 2014 Jun

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation (NRF) grant funded by the Korean government (MEST) (No. 2012R1A2A2A01045102). K-S Lee acknowledges the funding for this work from the NRF through the Active Polymer Center for Patterned Integration (ERC R11-2007-050-01002-0). We also thank the Korea Basic Science Institute (KBSI) for the use of equipment for time-resolved PL confocal microscopy and HR-TEM.


  • Charge transfer
  • Energy transfer
  • Molecular electronics
  • Photoluminescence
  • Quantum dot
  • π-conjugate molecule

ASJC Scopus subject areas

  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics


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