Multi-wavelength intermittent photoluminescence of single CdSe quantum dots |
| |
| Authors: | Yuichi Yamasaki Harumi Asami Takashi Isoshima Itaru Kamiya Masahiko Hara |
| |
| Affiliation: | 1. Supramolecular Science Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama, 351-0198, USAyamasaki@bmw.t.u-tokyo.ac.jp;3. Frontier Research System, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan;4. Nanotechnology Laboratory, Mitsubishi Chemical Corporation, 1000 Kamosida-cho, Aoba-ku, Yokohama, 227-8502, Japan;5. Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatuda, Midori-ku, Yokohama, 226-8502, Japan;6. Supramolecular Science Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama, 351-0198, USA |
| |
| Abstract: | A single chromophore detection using video-microscopy is one of the latest methodologies to reveal unique characteristics, which could not be obtained from ensemble measurements. Among many kinds of subjects, dynamic optical properties observed in colloidal semiconductor nanoparticles are attractive and important not only for the basis of photo-physics but also for application studies, e.g. biological labeling, electronic devices. In this study, fluorescence video-microscopy was performed on cadmium selenide (CdSe) quantum dots (QDs) spin-coated on a glass substrate. From single CdSe QDs detection, emissions at wavelengths separated over 60 nm were observed for the first time. This spectral feature was attributed to the existence of double-emissive relaxation processes in CdSe QDs. Photoluminescence intermittency was also observed both from relaxation processes. Fluorescence video-microscopy, which was advanced in biology, can be applicable for the real-time monitoring of dynamic properties in semiconductor photo-physics. |
| |
| Keywords: | Single chromophore detection Luminescence Emission Nanoparticle Cadmium selenide Quantum dot Quantum confinement Intermittency Semiconductor Exciton |
|
|
