Dynamics of the Poto-induced Phase Transition in Pi-conjugated Polymer : Polydiacetylene

Pi 共轭聚合物中 Poto 诱导的相变动力学：聚二乙炔

• 批准号: 06452045
• 负责人: KOSHIHARA Shin-ya
• 金额: $ 5.44万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452045/
• 关键词: Daynamical process; Poto-induced phase transition; Polydiacetylene; Time-resolved spectroscopy; Transient domain injection; Domain wall; Photocurrent; 共役ポリマー; 相転移ダイナミクス; 時間分解分光法; 固相重合法

The dynamical process of the photo-induced phase transition in polydiacetylene (PDA) single crystals has been investigated by time-resolved spectroscopy with varying temperature, excitation photon energy, and intensity. The photo-induced phase transition can be driven bidirectionally between the two (A and B) phases by dichromatic irradiation of a laser pulse, when the temperature of the PDA crystalis kept around the phase transition temperature (Tc). It was found that primary processof the photo-induced phase transition is mostly completed within 1 ns. In addition, occurrence of a transient domain injection has been confirmed at temperatures far below Tc. Together with the time-resolved measurement of photo-current, we have found a close correlation between the photocurrent intensity and the phase conversion efficiency. This suggest that the domain walls separating theA and B phases can carry the charge.

通过温度变化，激发光子能量和强度的时间分辨光谱法研究了光乙烯（PDA）单晶中光诱导的相位转变的动力学过程。当PDA晶体的温度保持在相变温度（TC）周围时，可以通过激光脉冲的二分光照射在两（a和b）相之间双向驱动光引起的相变。发现光诱导的相变的主要过程大部分是在1 ns之内完成的。另外，在远低于TC的温度下，已经确认了瞬态注射的发生。加上光电流的时间分辨测量值，我们发现光电流强度与相位转换效率之间存在密切相关性。这表明将裂变和B相分开的域壁可以带动电荷。

项目成果

S.Koshihara,Y.Tokura,K.Takeda and R.Koda: "Dynamics of a photoinduced phase transition in polydiacetylene crystals" Phys.Rev.B. 52. (1995)

S.Koshihara、Y.Tokura、K.Takeda 和 R.Koda：“聚二乙炔晶体中光致相变的动力学”Phys.Rev.B。

S.Koshihara,Y.Tokura,N.Sarukura,Y.Segawa,T.Koda and K.Takeda: "Nonosecond and picosecond dynamics of photo-inducedphase-transition in low dimensional organic crystals" Synthetic Metals. 70. (1995)

S.Koshihara、Y.Tokura、N.Sarukura、Y.Sekawa、T.Koda 和 K.Takeda：“低维有机晶体中光诱导相变的非秒和皮秒动力学”合成金属。

S.Koshihara, Y.Tokura, K.Takeda and T.Koda: "Dynamics of a photoinduced phase transition in polydiacetylene crystals." Phys.Rev. B 52. (1995)

S.Koshihara、Y.Tokura、K.Takeda 和 T.Koda：“聚二乙炔晶体中光致相变的动力学。”

S.Koshihara, Y.Tokura, N.Sarukura, Y.Segawa, T.Koda and K.Takeda: "Nanosecond and picosecond dynamics of photo-inducedphase -transition in low dimensional organic crystals." Synthetic Metals. 70. (1995)

S.Koshihara、Y.Tokura、N.Sarukura、Y.Sekawa、T.Koda 和 K.Takeda：“低维有机晶体中光致相变的纳秒和皮秒动力学”。

S.Koshihara,N.Sarukura,Y.Segawa,Y.Tokura,T.Koda and K.Takeda: "Dynamics of photo-induced phase-transition in low dimensional organics crystals and the role of ohotocarriers" Mol.Cryst.Lip.Cryst.252. (1994)

S.Koshihara、N.Sarukura、Y.Sekawa、Y.Tokura、T.Koda 和 K.Takeda：“低维有机晶体中光诱导相变的动力学和光载流子的作用”Mol.Cryst.Lip。