[21p-141-1~8] Recent Progress of Organic Electronics in Japan and Korea II : from viewpoints of basic science and application

▲ [21p-141-7] Recent progress in organic light-emitting devices

〇Taishi Takenobu¹ (1.Nagoya Univ.)

Keywords:organic light-emitting device, light-emitting transistor, light-emitting electrochemical cell

Although full-color monitors of organic light-emitting diodes (OLEDs) are already available in the market, an electrically-pumped organic semiconductor laser (OSL) remains a very challenging problem for conventional OLEDs. Particularly, for electrical excitation of OSLs, extremely high current density more than 1 kA/cm² is required. However, the maximum current density of OLEDs are typically limited to 1-10 A/cm². Recently, to address this limitation, we focus on two unique organic light-emitting devices, such as organic single-crystal light-emitting transistors and organic electrochemical light-emitting cells. These light-emitting devices have p-i-n homojunction with highly conductive active area owing to electro-static or electro-chemical carrier doping, which is irrealizable for OLEDs. As the results, we demonstrated the effective light emission with extremely high current density more than 1 kA/cm², which is the first important milestone for future electrically-pumped OSLs.