窄谱带绿色有机电致发光器件

以Tb³⁺:水杨酸(Tb³⁺:(SA)₃)为空穴传输层兼发光层、高荧光材料Alq₃为电子传输层,得到了窄谱带的绿色有机薄膜电致发光双层结构器件.实验证实,双层器件的电致发光是电荷载流子隧穿内界面(Tb³⁺:(SA)₃/Alq₃)之后分别在两有机层内的复合发光,是两有机层本征发光的叠加.其光谱随着电子传输层厚度而改变,因而减少电子传输层厚度能得到亮度高、稳

PURE GREEN AND NARROW BANDWIDTH ELECTROLUMINESCENCE FROM ORGANIC LIGHT-EMITTING DIODES

Pure green and narrow bandwidth emission from organic bilayer electroluminescent devices were presented by using Tb3+∶(SA)3 as hole-transporting layer and emissive layer, and high fluorescent material Alq3 acting as electron-tr ansporting layer. It proves that the emission comes from carriers' recombinatio n af ter their tunneling through the inner interface (Tb3+∶(SA)3/Alq3) in the bilaye r ITO/Tb3+∶(SA)3(40nm)/Alq3(55 nm)/Al diode. The spectrum of the bil ay er devices varies with the thickness of the electron-transporting layer. Keepin g the thickness of Tb3+∶(SA)3 layer constant, there is no emission from Alq3 layer when Alq3 layer reduces to 12?nm; meanwhile, pure green and nar ro w bandwidth emission can be observed. Thus, it provides a simple way to obtain h igh luminance and long-term stability by reducing electron- or hole-transport ing layer, especially, by using a lanthanide complex for emissive layer.