PHOTOINDUCED ABSORPTION OF STRUCTURALLY IMPROVED POLY(P-PHENYLENE VINYLENE) - NO EVIDENCE FOR BIPOLARONS

被引:22
作者
PICHLER, K [1 ]
HALLIDAY, DA [1 ]
BRADLEY, DDC [1 ]
FRIEND, RH [1 ]
BURN, PL [1 ]
HOLMES, AB [1 ]
机构
[1] UNIV CAMBRIDGE,CHEM LAB,CAMBRIDGE CB2 1EW,ENGLAND
关键词
D O I
10.1016/0379-6779(93)90938-S
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have recently developed a synthetic route to poly(p-phenylene vinylene), PPV, which gives improved intrachain order. This has a large effect on the optical properties. We present data on photoinduced absorption for this form of PPV. The changes as compared to PPV prepared from the standard sulphonium precursor polymer are significant. Firstly, on the time scale of our experiments there is no evidence for photogenerated metastable bipolarons, usually observed in standard PPV. Secondly, the strong induced absorption due to triplet-triplet transitions is red-shifted to about 1.36 eV and is slightly narrower. This triplet absorption has a much stronger temperature dependence than observed in ordinary PPV, and is not seen above ca. 70 K. We consider that in this new form of PPV there are fewer defects which are responsible for the stabilisation of long-lived charged excitations.
引用
收藏
页码:230 / 234
页数:5
相关论文
共 12 条
  • [1] Bloor D., 1985, NATO ASI SERIES E, V102
  • [2] BURN PL, 1992, SPRINGER SERIES SOLI, V107, P107
  • [3] LIGHT-EMITTING-DIODES BASED ON CONJUGATED POLYMERS
    BURROUGHES, JH
    BRADLEY, DDC
    BROWN, AR
    MARKS, RN
    MACKAY, K
    FRIEND, RH
    BURN, PL
    HOLMES, AB
    [J]. NATURE, 1990, 347 (6293) : 539 - 541
  • [4] ENHANCED ORDER AND ELECTRONIC DELOCALIZATION IN CONJUGATED POLYMERS ORIENTED BY GEL PROCESSING IN POLYETHYLENE
    HAGLER, TW
    PAKBAZ, K
    VOSS, KF
    HEEGER, AJ
    [J]. PHYSICAL REVIEW B, 1991, 44 (16): : 8652 - 8666
  • [5] HALLIDAY DA, 1993, SYNTHETIC MET, V55
  • [6] OLANERI NF, 1990, PHYS REV B, V42, P11670
  • [7] OPTICAL SPECTROSCOPY OF PHOTOINDUCED AND FIELD-INDUCED EXCITATIONS IN POLYACETYLENE PREPARED BY THE DURHAM PHOTOISOMER ROUTE
    PICHLER, K
    FRIEND, RH
    PARKER, D
    FEAST, WJ
    [J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 1991, 3 (17) : 3007 - 3021
  • [8] PICHLER K, UNPUB
  • [9] EXCITON VERSUS BAND DESCRIPTION OF THE ABSORPTION AND LUMINESCENCE SPECTRA IN POLY(PARA-PHENYLENEVINYLENE)
    RAUSCHER, U
    BASSLER, H
    BRADLEY, DDC
    HENNECKE, M
    [J]. PHYSICAL REVIEW B, 1990, 42 (16): : 9830 - 9836
  • [10] SAMUEL IDW, IN PRESS SYNTH MET