OPTICAL-PROPERTIES AND LONG-LIVED CHARGED PHOTOEXCITATIONS IN POLYDIACETYLENES

被引：27

作者：

COMORETTO, D ^{[1
]}

CUNIBERTI, C ^{[1
]}

MUSSO, GF ^{[1
]}

DELLEPIANE, G ^{[1
]}

SPERONI, F ^{[1
]}

BOTTA, C ^{[1
]}

LUZZATI, S ^{[1
]}

机构：

[1] CNR,IST CHIM MACROMOLEC,I-20133 MILAN,ITALY

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.49.8059

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the vibrational and electronic structure and the elementary excitations of poly [1,6-di(N-carbazolyl)-2,4-hexadiyne] (polyDCHD), poly[1-(N-carbazolyl)penta-1,3-diyn-5-ol] (polyCPDO), and poly[1-(N-carbazolyl)penta-1,3-diyn-5-acetoxy] (polyCPDA) by electronic absorption, Raman scattering, and photoinduced absorption in the infrared region. The long-lived photoexcitations are charged bipolarons with associated infrared-active vibrational (IRAV) modes. The results are also discussed in relation to the degree of chain order of the different polydiacetylenes as evidenced by the electronic spectra. Only poly(DCHD) shows an absorption spectrum dominated by a single exciton, suggesting a one-dimensional ordered structure. Consequently, for this polymer only, triplet excitons with a lifetime of the order of ms are photogenerated in addition to bipolarons. Among polydiacetylenes, only poly(CPDA) shows photoinduced IRAV modes not affected by Fano coupling between electronic and vibrational states.

引用

页码：8059 / 8066

页数：8

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