[14p-2D-1~19] 4.4 Opto-electronics

▲ [14p-2D-7] Optoelectronic Applications Using Hybrids of Quantum Dots and Organic Semiconductors

〇JINSOO JOO¹, Yoon Deok Han¹, Eun Hei Cho¹, Kwang-Sup Lee², Jeongyong Kim³ (1.Korea Univ., 2.Hannam Univ., 3.Sungkyunkwan Univ.)

Keywords:quantum dot,organic semiconductor,optoelectronics

Hybrid nanostructures of quantum dots (QDs) and π-conjugated organic semiconductors were fabricated for the study of energy and charge transfer effects. Nanoscale multicolor optical waveguides have been demonstrated using a novel hybrid composite of highly crystalline blue-light-emitting organic nanowire (NW) combined with blue, green, and red CdSe/ZnS QDs. Emissions of QDs can be transferred and optically waveguided through highly packed π-conjugated organic molecules with different decay characteristics. Hybrid NWs of TSDB/G(green)-QDs/R(red)-QDs have shown a near white-color waveguiding with three constituent wavelengths centered at 488, 532, and 638 nm. These peaks cover the visible range, and the proportion of each color’s component was calculated in terms of the CIE coordinates. We also observed the enhancement of the photoluminescence (PL) intensity for remote detection of Cy3 dye attached bio-materials by means of the waveguided QDs emissions and the efficient coupling of the QDs emission to the NW.
Hybrid nanoparticles consisting of CdSe/ZnS QD as a core and p-type organic molecules as a shell were fabricated, and nanoscale PL and photoresponsive molecular electronic characteristics were investigated. For different molecular level n-p-junctioned organics and QD hybrids, the nanoscale PL and molecular optoelectronic properties were tuned by their intermolecular distance and the degree of spectral overlapping. And the photovoltaic behavior was observed from a single unit of QD-P3HT hybrid nanoparticle.