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A novel class of organic semiconducting materials, thiophene/phenylene co-oligomers (TPCO), has been developed and synthesized. The materials are formed into crystals of high quality in a gas or liquid phase. These crystals exhibit unique optoelectronic properties such as a high carrier mobility and high quantum yield of emission. The transport properties have been studied on a device configuration of the field-effect transistor. The laser oscillation has definitively been observed for single crystals of the TPCO materials. In this article these optoelectronic features are presented and summarized. [ABSTRACT FROM AUTHOR]

We measured static characteristics and dynamic behavior of OLED devices, and we confirmed experimentally that device characteristics of OLED devices were dependent on ionization potential of a hole transport layer through a space charge layer formation in the device. [ABSTRACT FROM AUTHOR]

We proposed and synthesized a new oxadiazole derivative, 1,3-bis [2-(3,5-trifluoromethylphenyl)-1,3,5-oxadiazole-5-yl]benzene (F 12 -OXD). We investigated the characteristics of F 12 -OXD as an electron transport layer for organic light-emitting diodes (OLEDs) and a cladding layer for organic semiconductor lasers (OSLs). We confirmed that F 12 -OXD was available for OLEDs and OSLs. [ABSTRACT FROM AUTHOR]