We are willing to accept graduate students widely (in Department of Chemistry and Biochemistry, Graduate School of Engineering). If you are interested in our group, please contact us. Let’s explore Organic Electronics and Materials Science together!
Inamori Frontier Research Center
744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
Synthetic organic chemistry, which can produce new molecules, plays a pivotal role in developing various functional organic materials. Our research group is promoting the fundamental and application studies on functional organic materials for advancement of novel materials science. π-Conjugated molecules consisting of C=C bonds show specific optical, electrical, and magnetic properties by delocalization of π-electrons. Incorporating such unique characteristics in materials design enables us to produce organic semiconductor molecules exhibiting luminescence and electrical conduction properties. Molecular design has infinite possibilities, and it is possible to create new materials with superior and outstanding optoelectronic properties and functions which cannot be realized by the conventional materials. We are advancing the study aiming at exploration of various functions of materials, such as emission, transport, conversion, and response, and their application for contributing the next-generation materials and device science. Not only the design of individual molecular structures but also control of organized aggregation structures and condensed morphologies should be the key for functionalization of the molecular system as an actual material.
Molecular Organization of π-Materials for Charge Transport Functionality
In order to answer the basic question, “how fast charge carriers can move in organic materials?”, we are exploring unprecedented exotic electronic functions of the π-materials. Extremely high charge transport properties (or carrier mobilities) surpassing those of conventional materials can be realized by assembling organic semiconducting molecules and constructing sophisticated self-organized structures in a micro to millimeter scale. Precise control of the molecular assembled structures can lead to superior semiconductor characteristics comparable to silicon and their application to high-performance printed electronics.
・Chem. Commun. 2013, 49, 6483.
・Bull. Chem. Soc. Jpn. 2012, 85, 1186.
Photovoltaics Based on π-Materials toward Renewable Energy Technology
The global environmental problems and exhaustion of energy resources are attracting attention and hence use of renewable clean energy has been becoming an important technology. We are developing organic photovoltaic device (or solar cell) technologies for effective utilization of light energies including sunlight. High-efficiency photovoltaic functions can be achieved by constructing appropriate nanostructures using self-organization of the π-materials. We are also advancing our study on application to ubiquitous energy-harvesting technologies (i.e. environmental power generation), which can extract weak energy as a power source.
・Adv. Energy Mater. 2014, 4, 1400879.
・Chem. Mater. 2013, 25, 2549.
High-Efficiency Luminescent π-Materials and Their OLED Applications
Organic electroluminescence devices are being developed intensively for practical use as next-generation flat-panel displays and general lighting sources. The development of efficient light-emitting molecules is a key issue for achieving the high-performance electroluminescence devices. From the view point of molecular science, we are developing ultrahigh-efficiency luminescent π-materials that surpass the traditional theory and efficiency limit.
・Angew. Chem. Int. Ed. 2014, 53, 6520.
・Adv. Mater. 2013, 25, 2666.
・Appl. Phys. Lett. 2012, 101, 093306.
Stimuli and Environment Responsive Smart π-Materials
Under the condition of molecular condensed states, the electronic and optical functions of π-materials are greatly affected by intermolecular interactions and variations in molecular packing and polymorphs. We are working on development of smart π-materials which can modulate these functions in response to external stimuli or environmental changes. We study the structure–property relationships of the smart π-materials, aiming at their practical use in organic devices and other applications.
・Chem. Commun. 2014, 50, 1523.
Soft Organic Semiconductors Forming Ordered Nanostructures
Liquid crystal is a molecular condensed state that possess both molecular ordering and dynamic properties. By incorporating the self-organizing properties of the liquid crystals into the design of π-materials, well-organized layered (2D), columnar (1D), and globular (0D) nanostructures consisting of functional π-conjugated assemblies can be constructed. We are working on development of soft semiconductors combining unique electro- and photo-functions of π-materials with dynamic and anisotropic (directionally-dependent) properties of liquid crystals.
・J. Am. Chem. Soc. 2011, 133, 13437.
・Adv. Funct. Mater. 2009, 19, 411.
・Chem. Commun. 2009, 729.