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

9812852 Heeger这个项目研究用作激光材料的半导体聚合物的特性。这项研究的目的是寻找方法和手段来提高它们的性能，使其与传统的GaInN发光二极管竞争。由于聚合物的激光阈值高于InGaN LED的输出或聚合物LED中可以达到的激发水平，迄今通过从电极注入电子和空穴的直接电泵浦或通过将聚合物激光器整体放置在蓝光发射的InGaN LED或激光器上来制造高效二极管激光器的尝试尚未成功，所述聚合物的激光阈值高于InGaN LED的输出或聚合物LED中可以达到的激发水平。为了解决这些问题，将少量的客体聚合物混合到主体聚合物中，以使福斯特能量从主体发生转移到客体发射体。具体目标是展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Forster从主机到客户的能量传递。将使用超快时间分辨光谱分析进行测量。该项目为在技术重要性日益增长的领域培养研究生和博士后研究助理提供了极好的机会。这项研究涉及聚合物材料中能量传递的基本方面，使其适合作为高效激光器。这项研究涉及研究生和博士后研究助理，他们在不断增长的技术领域接受的培训为他们在21世纪的前沿科学和技术领域就业做好了准备。***

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. ***