ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The red emission from (CH3)4NMnBr3 (TMMB) crystals is quenched by small concentrations of Cu2+. The emission decay curves from TMMB crystals doped with Cu2+ deviate dramatically from simple exponential form. Consistent with the linear chain structure of TMMB, the decay curves are accurately described by expressions derived to treat exciton trapping in a one-dimensional lattice. The analysis of the data indicate that the intrachain exciton migration is rapid, with a hopping frequency at room temperature of 1011 to 1012 s−1. The temperature dependence of the emission decay curves is consistent with an energy barrier to migration of 600 to 700 cm−1. Interchain migration apparently makes a negligible contribution to exciton trapping in TMMB with the interchain hopping frequency estimated to be less than 102 s−1. Within the limits of the experimental data, energy transport in TMMB is perfectly one-dimensional.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.451849
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