聚苯胺在聚合物发光二极管中的空穴传输作用

报道了聚苯胺中间氧化态(emeraldine base form PANI-EB)空穴传输层对以PPV衍生物(PTA-PPV,PTA-DMPPV和MEH-PPV)为发光层和Alq₃为电子传输层构成的多层结构的发光二极管的影响。实验结果表明,在器件中PANI-EB空穴层的引入能有效地降低器件的启亮电压和提高器件的发光亮度,其影响程度依赖于PPV衍生物的结构。

Emeraldine Base form of Polyaniline in Organic Hole Transporting Materials for Use in Electroluminescent Devices

Three kinds of multi-layer light emitting diodes (LEDs) were fabricated, in which poly (phenylene vinylene) derivatives, such as poly (2-methoxy-5-(2-ethyl-hexoxy)-l,4-phenylene-vinylene (MEH-PPV), the alternating copolymer of triphenylamine and phenylene vinylene (TPA-PPV) and the alternating copolymer triphenylamine and phenylene vinylene (TPA-DMPPV) were used as light emitting materials, Alq3 was used as electron-transport materials, while emeraldine base form of polyaniline (PANI-EB) was used as hole-transport materials. It was found that the PANI-EB layer as a hole-transport layer introduced into the PPV derivative/Alq3 diodes reduced the threshold voltage and enhanced the emission intensity of the diodes. This might result from decreasing of the barriers of ITO/PPV derivative interface and benefit for the hole injection and electron/hole transport. Moreover, enhancement of the diode properties resulted in PANI-EB layer is related to the structure of PPV derivatives, and an order of TPA-PPV>MEH-PPV>TPA-DMPPV in lightness was observed.