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Long‐Range Exciton in a PNB Polymer and Its Responses to Electrostatic Fields
Author(s) -
Huang D.,
Li H.,
Liu J.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200209)233:2<197::aid-pssb197>3.0.co;2-z
Subject(s) - exciton , absorption (acoustics) , polymer , range (aeronautics) , materials science , soliton , blueshift , field (mathematics) , electrochromism , molecular physics , condensed matter physics , physics , optoelectronics , optics , photoluminescence , quantum mechanics , nonlinear system , mathematics , pure mathematics , composite material , electrode
Long‐range excitons are obtained for an open chain of a PNB polymer with finite length, in the framework of the Baranowski–Büttner–Voit model. The results show: an applied field results in a blue shift (∼0.25 eV) of the exciton absorption. As the field is stronger than 925 kV/cm, the exciton is dissociated into a soliton and an anti‐soliton, while zero‐field absorption of the exciton is split into two peaks at 1.1 and 1.3 eV, which is consistent with the observed two short‐lived peaks of the photoinduced absorption in the polymer. We try to understand the observed electrochromism of the polymer by the blue shift.