Dong Chan Shin has obtained his BS degree in Materials Science and Engineering from Korea University and has pursued his MS and PhD degrees in Materials Science and Engineering from Korea Advanced Institute of Science and Technology, South Korea. He was Postdoctoral Associate from at KAIST and Michigan Technological University. He was a Senior Researcher at Samsung SDI. He is presently a Professor in Department of Advanced Materials Engineering at Chosun University, South Korea. His current research is photonics area. Specifically, his research interests are OLED display and lighting, photonics crystal and its application to display. He has written 2 book chapters and more than 90 journal articles. He is Member of the Ceramic Society of Korea; the Korean information display society; the materials research society of Korea; the optical society of Korea and MRS.
The organic semiconductor is attractive candidate for the next generation electronic devices due to high flexibility, low production cost and easy fabrication of large area devices through solution process. However, since the organic semiconductor material has a van der Waals bond, the charge transport layer is unstable. Despite several researches, the intrinsic conducting properties of the organic semiconductor materials have not been clearly understood. To investigate intrinsic properties of the materials high quality single-crystal of the organic semiconductor materials are needed. To obtain large size single-crystal, understanding for growth mechanism of the organic semiconductor material is essential. We have fabricated of Alq3 single-crystal using a [C12mim] [TFSI] ionic liquid as a solvent. Isothermal heat-treatment has been carried out at 100 ℃ for 1h, 2h, 3h, 4h, 5h and 6hours with 7 mol% compositions. The Alq3 single-crystals were c-axis grown in hexagonal rod shape. They showed different crystal growth shapes according to the isothermal heat-treatment time. The shape of single-crystal Alq3 changes from growth shape to equilibrium shape. Our research could be promising process to improve electrical properties of organic semiconductor for many commercial devices such as organic light emitting diode (OLED), organic thin film transistor (OTFT) and organic solar cell.
Gurpreet Kaur is a Research Scholar at Thapar Institute of Engineering & Technology and working in plant molecular biology and biochemistry and having keen interest in biopolymer production.
Okara is a waste product of soy milk and tofu industry. It is rich in crude fibre consisting of cellulose, hemicelluloses and lignin along with proteins (~25%), fats (10-15%) and low level of carbohydrates. Large-scale production of okara is associated with disposal problem and environmental concerns as its high moisture content leads to rapid putrefaction. However, okara is widely used as cattle feed, manure, in bakery and silkworm foods. Currently, there is a considerable research focus on the development of novel biodegradable plastics from soya bean (Glycine max L.) and other agricultural crops. Okara is considered as a useful and cost-effective feedstock for the production of biodegradable plastics/films because of high fibre content. Most of the biodegradable soya plastics available so far are being used in disposable food service and packaging. These plastics look like petroleum based plastics and usually freezer safe; but they are sensitive towards high temperature, humidity and water. Production of petroleum plastics involves the use of carcinogenic pollutant namely formaldehyde. Relatively, the production process of the soy plastics is less hazardous to animal health and environment. Research focus is still required to improve the plasticity and elasticity of the bio films made from okara protein extract (OPI). In other words, the new forms of biodegradable plastics should find applications as butyl rubbers and packaging materials with high tensile strength. Such efforts would help in reducing the plastic and garbage mesh helping in getting the environment cleaner and greener.