ORGANIC LIGHT EMITTING TRANSISTORS FOR FLEXIBLE DISPLAYS

将有机静电感应晶体管（OSIT）与有机发光二极管（OLED）垂直组合，制备了有机发光晶体管（OLET），并对其器件特性进行了研究。采用酞菁铜（Pc）和α-NPD与栅型Al栅电极的OSIT显示出基本的SIT特性和相对高的电流密度和高速操作。结果表明，栅型铝栅电极的可控性对OSIT的特性有很大的影响。为了实现柔性电子电路和显示器，我们采用并五苯薄膜和铝栅电极在塑料衬底上制备了OSIT。与玻璃基片上的非柔性OSIT相比，塑料基片上的柔性OSIT显示出几乎相同的特性。OLET是用于柔性片材显示器的合适元件。通过优化栅电极和层厚度，在OLET中观察到低栅电压的高亮度调制。获得了大约100和300 Hz的相对高的开/关比和操作速度。这些结果表明，这里研究的OLET有望应用于显示器件。此外，我们还研究了光敏晶闸管器件的基本特性，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.