Temperature and Crystal Size Dependence of Excitonic Absorption for Polydiacetylene Microcrystals
Temperature and Crystal Size Dependence of Excitonic Absorption for Polydiacetylene Microcrystals
复制标题
聚二乙炔微晶激子吸收的温度和晶体尺寸依赖性
DOI：
10.1080/10587259808042489
复制
发表时间：
1998
影响因子：
0.7
通讯作者：
H. Nakanishi
中科院分区：
文献类型：
--
作者：
H. Katagi;H. Oikawa;S. Okada;H. Kasai;A. Watanabe;O. Ito;Y. Nozue;H. Nakanishi
摘要测量了聚二乙炔微晶的激子吸收随温度和晶体尺寸的变化。用最近报道的再沉淀法制备了聚DCHD微晶，并通过改变注入水中的二乙炔单体溶液的浓度来控制微晶的尺寸。激子吸收峰位置从650 nm蓝移到635 nm，晶体尺寸从120 nm减小到30 nm。另一方面，当温度从273K降低到4K时，峰位置红移了15 nm(300 cm−1)，半峰宽也随着红移而变窄。这些现象被认为与激子态和声子之间的耦合作用有关，取决于晶体的大小和温度。
Abstract The excitonic absorption of well defined polydiacetylene microcrystals was measured as a function of temperature and crystal size. Poly-DCHD microcrystals were prepared by a recently reported reprecipitation method, and crystal size was controlled by changing the concentration of diacetylene monomer solution injected into water. The excitonic absorption peak position was blue-shifted from 650 nm to 635 nm with decreasing crystal size from 120 nm to 30 nm. On the other hand, the peak position was red-shifted by 15 nm (300 cm−1) upon decreasing the temperature from 273 K to 4 K. Narrowing of the half peak width was also observed to accompany this red- shift. These phenomena are considered to be related to the coupling interaction between the excitonic state and phonons depending on crystal size and temperature.