Ultrafast Spectroscopic Studies of Forster Energy Transfer in Semiconducting Polymer Blends: The Route to High Gain Materials for Low Threshold Polymer Lasers

这个项目研究用作激光材料的半导体聚合物的特性。本研究的目标是找到改善其性能的方法和手段，使其与传统的GaInN发光二极管竞争。尝试了迄今为止作出有效的二极管激光器通过直接电注入由电极注入的电子和空穴或将聚合物激光单到blue-emitting InGaN领导或激光将用于光泵聚合物激光器没有成功由于事实,即激光阈值的聚合物高于输出InGaN或领导的激励水平,可以在聚合物发光二极管来实现。为了解决这些问题，将少量的客体聚合物混合在宿主聚合物中，使福斯特能量从宿主转移到客体发射器。具体目标是演示和开发共轭聚合物共混物作为高增益/低损耗激光材料，并优化从主客体到客体的福斯特能量传递。超快时间分辨光谱学将用于测量。该项目为在一个日益重要的技术领域培养研究生和博士后研究人员提供了极好的机会。这项研究涉及聚合物材料中能量传递的基本方面，以使它们适合作为高效激光器。该研究涉及研究生和博士后研究人员，他们在不断发展的技术领域的培训为他们在21世纪的前沿科学和技术领域就业做好准备。＊＊＊

9812852HeegerThis project deals with the properties of semiconducting polymers used as laser materials. The goal of this research is to find ways and means to improve their performance to make them competitive with conventional GaInN light emitting diodes. Attempts made so far to make efficient diode lasers via direct electrical pumping by injecting electrons and holes from electrodes or by placing the polymer lasers monolithically onto a blue-emitting InGaN LED or laser which would be used to optically pump the polymer laser have not been successful owing to the fact that the lasing thresholds of the polymers are higher than the output of an InGaN LED or of the excitation level that can be achieved in polymer LEDs. To deal with these problems small amounts of a guest polymer will be blended in a host polymer in such a way that the Forster energy transfer will occur from the host to the guest emitter. The specific goal is to demonstrate and develop conjugated polymer blends as high gain/low loss laser materials and to optimize the Forster energy transfer from host to guest. Ultrafast time-resolved spectroscopy will be used to perform the measurements. This project offers excellent opportunities for the training of graduate students and post doctoral research associates in a field of growing technological importance. %%%This research deals with fundamental aspects of the energy transfer in polymeric materials to render them suitable as efficient lasers. The research involves graduate students and post doctoral research associates, whose training in a growing technological field prepares them for employment in forefront scientific and technical areas in the 21st Century. ***