New Conducting Polymers for User as Active Layers in Light Emitting Diodes

UNIAX开发了一系列酯取代的可溶性 聚（对亚苯基）PPP用作蓝色的有源层， 紫色发光二极管（LED）。 合成路线 简单，有利于大规模，并允许各种各样的 衍生物-使其他途径成为蓝色发光导电 聚合物看起来很笨拙或过时。 衍生品已经量身定制 在非极性溶剂如己烷或极性溶剂中具有溶解性 溶剂如乙醇。 直接从溶液中纺丝成膜 无针孔且透明，但呈现紫色或蓝色色调 在反射的阳光下。 所有的光致发光光谱 报道了制备的衍生物（对于一些 衍生物超过3.0 eV），以及原型LED的制造 使用这些稳定的室温可处理PPP之一的器件 衍生品已经实现。 将这项初步研究发展成一项 商业上有吸引力的便携式显示器涉及纯化 导电聚合物活性层以优化效率， 并系统地研究二极管特性 （效率或"亮度"和发光开启电压） 作为有源层厚度的函数， 电极接触和金属电子注入的性质 contact. 这项研究还将包括研究合成 一种绿色发光PPP，利用电子- 释放基团使发光红移。

UNIAX has developed a series of ester-substituted soluble poly(para-phenylenes) PPP for use as active layers in blue and violet light emitting diodes (LEDs). The synthetic route is simple, conducive to large scale, and allows for a wide variety of derivatives - making other routes into blue luminescent conducting polymers seem awkward or obsolete. Derivatives have been tailored to have solubility in non-polar solvents such as hexane or in polar solvents such as ethanol. Films spun-cast directly from solution are pinhole-free and transparent, but take on a violet or blue hue in reflected sunlight. Photoluminescent spectra for all derivatives prepared are reported (luminescence energies for some derivates exceed 3.0 eV), and the fabrication of a prototypes LED device using one of these stable room-temperature processible PPP derivatives has been achieved. The goal in developing this preliminary research into a commercially attractive portable display involves purification of the conducting polymer active layers to optimize the efficiency, and to systematically investigate diode characteristics (efficiency, or "brightness," and light emission turn-on voltage) as a function of active layer thickness, nature of the transparent electrode contact, and nature of the metal electron-injecting contact. The research will also include research into synthesizing a green luminescent PPP, making use of the finding that electron- releasing groups red-shift the luminescence.