| 高分子中的激子-激子复合过程 |
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| 引用本文： | 赵二海,傅荣堂,孙 鑫,傅柔励,褚君浩,张志林,蒋雪茵. 高分子中的激子-激子复合过程[J]. 物理学报, 1998, 47(12): 2031-2039 |
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| 作者姓名： | 赵二海 傅荣堂 孙 鑫 傅柔励 褚君浩 张志林 蒋雪茵 |
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| 作者单位： | (1)复旦大学物理系,李政道物理综合实验室，上海 200433; (2)红外物理国家重点实验室，中国科学院上海技术物理研究所，上海 200083; (3)上海大学嘉定校区材料学院，上海 201800 |
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| 基金项目： | 国家自然科学基金(批准号：59790050；19574012)、国家高技术研究发展计划(批准号：863-715-010)和上海应用物理研究中心资助的课题. |
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| 摘 要： | 高分子的一维特性使电子激发产生显著的自陷(self-trapping)效应，两个单激子(exciton)会复合形成双激子(biexciton)，这是形成双激子的重要通道，其效率高于双光子过程.这种复合过程伴随着晶格畸变，需要了解其演变过程并确定其弛豫时间.本文利用动力学方程研究了激子-激子复合的弛豫过程，确定了它的弛豫时间为160fs，同时还研究了外电场E对复合过程的影响，结果表明，当E大于0.5MV/cm时，两个单激子不能复合成双激子，而是解离成正负双极化子.关键词：
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| 关 键 词： | 高分子 双激子 激子复合过程 光学性质 |
| 收稿时间： | 1997-11-28 |
| 修稿时间： | 1998-06-08 |
THE COMBINATION PROCESS OF TWO EXCITONS TO ONE BIEXCITON IN POLYMERS |
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| ZHAO ER-HAI,FU RONG-TANG,SUN XIN,FU ROU-LI,ZHU JUN-HAO,ZHANG ZHI-LING and JIANG XUE-YIN. THE COMBINATION PROCESS OF TWO EXCITONS TO ONE BIEXCITON IN POLYMERS[J]. Acta Physica Sinica, 1998, 47(12): 2031-2039 |
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| Authors: | ZHAO ER-HAI FU RONG-TANG SUN XIN FU ROU-LI ZHU JUN-HAO ZHANG ZHI-LING JIANG XUE-YIN |
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| Abstract: | Due to the one-dimensional characteristic, the excitation of electrons in polymers will be self-trapped, and two excitons can be combined to form one biexciton. This combination process is one of the most important channels leading to form the biexciton, the efficiency of is much higher than the two-photon process. This kind of combination is accompanied by lattice distortion. By employing the dynamic equation, the relaxation process of this combination is investigated in this paper, and it is found that the relaxation time is about 160fs. The effect of external electrical field on the combination is also studied, the results show that when the electric field E is greater than 0.5MV/cm, instead of the biexciton, two bipolarons are produced. |
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