基于垂直结构的有机光发射晶体管制备与性能研究

Fabrication and performance of organic light-emitting transistor based on vertical structure

制备了一种有机垂直光发射晶体管,兼具有机发光二极管的发光和晶体管的开关调节两个功能.其结构为一个有机发光单元垂直堆叠在一个电容单元上,两单元通过一个共有的源电极连在一起.当电容单元被充电时,积累在源电极的电荷能有效地调节源极与有机层之间的载流子注入势垒,从而达到控制源漏输出电流的大小,最终控制发光单元发光的强度.实验结果表明,器件可提供0.2mA的输出电流,其大小可驱动发光单元发光,工作电压(开启电压)为6V.这种垂直集成方案,实现了器件多功能化,为有机发光二极管有源矩阵驱动的实际应用提供了一种新的解决方法.

A vertical organic light-emitting transistor（VOLET） was fabricated by stacking a capacitor cell on top of an organic light emitting cell joined by a common source electrode,and the operation mechanism was analyzed.This unique device has the dual functions of emitting light as an OLED and switching current as a transistor.When the capacitor is under bias,the stored charges on the thin and coarse electrode shared by the two units modulate the charge injection of the OLED active unit,hence control the current flow and consequently tune the light emission.This device structure provides an extremely short channel in the nanometer range and a large conduction area（0.04 cm2）,which supply enough output current（up to 0.2 mA） to drive the light emitting unit.As a result,thanks to the vertical integration,this device not only realizes multifunction but also operates at lower voltage,which provides a navel solution for the active-matrix OLED display application.