Photoluminescence spectra of oligo-paraphenylenevinylenes: a joint theoretical and experimental characterization

被引:150
作者
Cornil, J
Beljonne, D
Heller, CM
Campbell, IH
Laurich, BK
Smith, DL
Bradley, DDC
Mullen, K
Bredas, JL
机构
[1] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545
[2] UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND
[3] UNIV SHEFFIELD,CTR MOL MAT,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND
[4] MAX PLANCK INST POLYMER RES,D-55128 MAINZ,GERMANY
关键词
D O I
10.1016/S0009-2614(97)00986-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present a joint theoretical and experimental characterization of the absorption and photoluminescence spectra of oligo-paraphenylenevinylenes containing from 2 to 5 phenylene rings, Attention is paid to the emission spectra and their vibronic progressions in order to shed light on the geometry relaxation phenomena in the lowest singlet excited state, The results indicate that the relaxation energy in the excited state increases with inverse chain length. For long conjugated chains, the relaxation energy of the bound electron-hole pair is extrapolated to be of the order of 0.14 eV and the most significant part of the geometry deformations are found to spread over a length of about 20 Angstrom. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:139 / 145
页数:7
相关论文
共 34 条
  • [1] THEORETICAL INVESTIGATION OF THE LOWEST SINGLET AND TRIPLET-STATES IN POLY(PARA-PHENYLENE VINYLENE)OLIGOMERS
    BELJONNE, D
    SHUAI, Z
    FRIEND, RH
    BREDAS, JL
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1995, 102 (05) : 2042 - 2049
  • [2] SOLITONS AND POLARONS IN POLYACETYLENE - SELF-CONSISTENT-FIELD CALCULATIONS OF THE EFFECT OF NEUTRAL AND CHARGED DEFECTS ON MOLECULAR-GEOMETRY
    BOUDREAUX, DS
    CHANCE, RR
    BREDAS, JL
    SILBEY, R
    [J]. PHYSICAL REVIEW B, 1983, 28 (12): : 6927 - 6936
  • [3] BRADLEY DDC, 1996, IN PRESS CURRENT OPI
  • [4] The exciton binding energy in luminescent conjugated polymers
    Bredas, JL
    Cornil, J
    Heeger, AJ
    [J]. ADVANCED MATERIALS, 1996, 8 (05) : 447 - &
  • [5] 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
  • [6] Direct measurement of conjugated polymer electronic excitation energies using metal/polymer/metal structures
    Campbell, IH
    Hagler, TW
    Smith, DL
    Ferraris, JP
    [J]. PHYSICAL REVIEW LETTERS, 1996, 76 (11) : 1900 - 1903
  • [7] CONWELL E, 1996, IN PRESS TRENDS POLY
  • [8] Cornil J, 1995, CHEM PHYS LETT, V247, P425, DOI 10.1016/S0009-2614(95)01224-9
  • [9] NATURE OF OPTICAL-TRANSITIONS IN CONJUGATED OLIGOMERS .1. THEORETICAL CHARACTERIZATION OF NEUTRAL AND DOPED OLIGO(PHENYLENEVINYLENE)S
    CORNIL, J
    BELJONNE, D
    BREDAS, JL
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1995, 103 (02) : 834 - 841
  • [10] CORNIL J, IN PRESS