多层有机薄膜电致发光器件

Multilayer Organic Thin Film Electroluminescence Devices

制备了以苯乙烯基三苯胺衍生物（简称ＳＡ）为空穴传输层Ａｌｑ３为发光层的双层有机薄膜电致发光器件。还把不同厚度的口恶二唑衍生物（ＰＢＤ）加在ＳＡ和Ａｌｑ３之间制备了两种三层结构的有机薄膜电致发光器件，实现了ＳＡ的蓝色发光。进行了器件存放实验，发现器件在大气中有较好的稳定性。十个月之后，仍有较高亮度的发光。分析了不同器件中的电致发光光谱和电流电压、亮度电压关系。计算了它们的量子效率，三种器件的量子效率都在０．１％以上，对以铝为电子注入电极的器件而言这是比较高的。并从能级结构模型出发。

A double layer organic thin film electroluminescent device (DLD) (ITO/SA/Alq3/Al) and two three layer devices (TLD) (ITO/SA/PBD/Alq3/Al) with different thickness of PBD have been prepared. Here SA is a kind of derivative of styrylphenylamine. The EL spectra, current voltage, brightness voltage and efficiency of the devices have been investigated. It was found that TLD with 35 nm PBD emitting both from Alq3 and SA, and DLD and TLD with 10 nm PBD have higher current density and brightness over 2 orders than TLD with thicker layer PBD, though that the quantum efficiency of three decives are almost the same. The quantum efficiency of devices with SA are 0.09-0.1%, much higher than the single Alq3 layer device (0.04%). Energy band models were schemed to well complain the EL performance of the devices. The stability against air was studied also. After put in air for ten months, the brightness of the device is about 50% of its initial one.