Ultrafast Spectroscopic Studies of Semiconducting Polymer Blends: The Route to High Efficiency Photoluminescence

具有较高量子效率的聚合物发光二极管（led）的发现为研究开辟了一个重要的新方向，扩大了导电聚合物在有源光源领域的可能应用。为了在聚合物led中实现高量子效率的电致发光，本研究项目解决了共轭聚合物中pi电子的基本物理问题。实验方法侧重于利用超快时间分辨光谱（分辨率小于1皮秒），包括亚皮秒时间分辨光诱导吸收、亚皮秒时间分辨发光和泵浦探针实验来表征受激辐射的可能作用。研究将集中在半导体发光聚合物的稀混合物上。具有较高量子效率的聚合物发光二极管（led）的发现为研究开辟了一个重要的新方向，扩大了导电聚合物在有源光源领域的可能应用。最近，克林顿总统关于国家利益科学的报告（“发光的聚合物”）强调了这一领域的潜在重要性。为了在聚合物led中实现高量子效率的电致发光，本研究项目通过研究光致发光和光致电荷/能量转移来解决共轭聚合物中pi电子的基本物理问题。实验方法侧重于使用超快时间分辨光谱分辨率（小于1皮秒）。＊＊＊

Heeger 9510387 The discovery of polymer light-emitting diodes (LEDs) with relatively high quantum efficiency has opened an important new direction for research and has expanded the possible applications for conducting polymers in the area of active light sources. With a goal of achieving high quantum efficiency electroluminescence in polymer LEDs, this research program addresses the basic physics of pi-electrons in conjugated polymers. The experimental methods focus on the use of ultrafast time-resolved spectroscopy (resolution less than a pico- second), including sub pico-second time-resolved photoinduced absorption, sub pico-second time-resolved luminescence and pump-probe experiments to characterize the possible role of stimulated emission. The research will focus on dilute blends of semiconducting luminescent polymers. %%% The discovery of polymer light-emitting diodes (LEDs) with relatively high quantum efficiency has opened an important new direction for research and has expanded the possible applications for conducting polymers in the area of active light sources. The potential importance of this area had been recently highlighted in President Clinton's report on Science in the National Interest ("Polymers that Glow"). With a goal of achieving high quantum efficiency electroluminescence in polymer LEDs, this research program addresses the basic physics of pi-electrons in conjugated polymers through studies of photoinduced luminescence and photo-induced charge/energy transfer. The experimental methods focus on the use of ultrafast time-resolved spectroscopy resolution (less than a pico-second). ***