ORGANIC LIGHT EMITTING TRANSISTORS FOR FLEXIBLE DISPLAYS

将有机静电感应晶体管(OSIT)和有机发光二极管(OLED)垂直组合制成有机电致发光晶体管(OLET)，并对其器件特性进行了研究。采用铜酞菁(Pc)和栅型铝栅电极的α-NPD OSIT显示出基本的SIT特性和较高的电流密度和高速工作。结果表明，栅型铝栅电极的可控性对OSIT特性有很大影响。为了实现柔性电子电路和显示，我们在塑料衬底上用并五苯薄膜和铝栅电极制作了OSIT。塑料衬底上的OSIT与玻璃衬底上的非柔性OSIT表现出基本相同的特性。OLET是一种适合于柔性平板显示的元件，通过优化栅极和层厚度，可以在低栅电压下观察到OLET具有较高的亮度调制。获得了相对较高的通断比和大约100和300赫兹的工作速度。这些结果表明，这里检查的OLET对于应用程序显示设备是预期的。此外，我们还研究了光晶闸管器件的基本性质，并探讨了自保持型器件的可能性。

Organic light emitting transistors(OLET) which are vertically combined with the organic static induction transistor(OSIT) and organic light emitting diode(OLED) are fabricated and the device characteristics are investigated. OSIT using copper phthalocyanine(Pc) and α-NPD with grid-type Al gate electrodes showed basic SIT characteristics and relatively high-current density and high-speed operation. It is found that the characteristics of OSIT are strongly affected by the controllability of the grid-type Al gate electrode. In order to realize the flexible electronic circuits and displays, we have fabricated OSIT on plastic substrates using pentacene film and Al gate electrode. The OSIT febricated on plastic substrate show almost same characteristics comparing with those of non-flexible OSIT on glass substrate. The OLET is a suitable element for flexible sheet display's. High luminance modulations by low gate voltage were observed in the OLET by optimizing the gate electrode and layer thickness. The relatively high on/off ratio and operational speed of approximately 100 and 300 Hz are obtained. These results demonstrate that the OLET examined here is expected for the application to display devices. Furthermore, we have investigated the basic properties of photo-thyristor devices and the possibility of self-holding-type devices was examined.