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Structure and transition of charged excitons
Author(s) -
Ge Li,
George Thomas F.,
Sun Xin
Publication year - 2009
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/pssb.200844388
Subject(s) - exciton , polaron , singlet state , degenerate energy levels , spin (aerodynamics) , biexciton , condensed matter physics , triplet state , physics , chemistry , state (computer science) , chemical physics , atomic physics , quantum mechanics , electron , excited state , thermodynamics , algorithm , computer science
In a polymer, a positive polaron p + attracts a negative polaron p – to form an exciton, which is neutral and has spin s = 0 (singlet, emissive) or s = 1 (triplet, non‐emissive). However, in non‐degenerate polymers, bipolarons (B) which are doubly charged and spinless are also carriers, such that B 2+ (B 2– ) attracts p – (p + ) to form a new kind of exciton – the charged exciton. Since the charged exciton has spin s = 1/2, the triplet state does not appear and is emissive. The structure and transition probability of the charged exciton are presented in this paper. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)