Semiconductor Nanoparticle (Quantum Dot)

Professor SUSUMU KUWABATA, Assistant Professor TARO UEMATSU [Graduate School of Engineering, Osaka University]

Semiconductor nanoparticles are gaining the spotlight as the materials that exhibit change in the optical properties depending on the particle size as well as the intense fluorescence emission hardly observed in bulk semiconductors. Because of the semiconductor property that does not select the wavelength, semiconductor nanoparticles have been more extensively used as the fluorescent staining reagent for biological specimens (biomarker). They have a broad range of applications, including the luminescent device, laser device, wavelength converter and photovoltaic devices. The study of semiconductor nanoparticles is viewed as an interdisciplinary area between the physics and chemistry.
The basic knowledge of materials is essential for understanding these researches.

In this lecture, the basic properties of semiconductors and alteration in their electronic strucures when they are made into nanoparticles are throughly explained by using physics on a faculty level. The lecture also refers to the progress of synthetic methods for luminescent nanoparticles, recent low-toxic nanoparticles, and so on. In addition, the lecture explains the photovoltaic devices and electroluminescence as examples of application other than fluorescent materials, with focusing on the outstanding properties that are peculiar to semiconductor nanoparticles.

Professor SUSUMU KUWABATA, Assistant Professor TARO UEMATSU [Graduate School of Engineering, Osaka University]

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