摘要
用双调制（斩波器和驻波调制器）和外差检测累积光子回波技术，研究了ＰＩＣ－Ｉ和ａｚａＰＩＣ－Ｉ混合分子集体有机纳米材料中一维Ｆｒｅｎｋｅｌ激子的位相弛豫过程．观测到激子失相时间Ｔ２随ａｚａＰＩＣ－Ｉ克分子数的增大从６０ｐｓ变为２２４ｐｓ．这与在含能量陷阱的分子聚集体中激子失相时间Ｔ２随陷阱的增加而变短的现象刚好相反．并且对在脉宽为４ｐｓ和相于时间为１ｐｓ的相干脉冲和非相干脉冲的不同激发条件下的实验结果进行了分析和讨论．
hase relaxation processes of one-dimension Frenkel excitons in organic nanostructure PIC-I and azaPIC-I mixed aggregates were investigated using heterodyne-detected accumulated photon echoes with double modulations(chopper and standing wave modulator). It was observed that the dephasing time T2 of excitons lengthened from 60 ps to 224 ps with increasing the mol of azaPIC-I. It is contrary to shortening of the dephasing time T2 of excitons in mixed aggregates with increasing traps. The results were discussed and analyzed under different excitation conditions of pulse duration 4 ps and correlation time 1 ps.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1996年第3期197-203,共7页
Chinese Journal of Luminescence
关键词
有机纳米材料
混合分子聚集全
累积光子回波
organic nanostructure material, mixed molecular aggregate, dephasing of Frenkel exciton, accumulated photon echo
