Energy transfer and exciton self-trapping in the charge-transfer crystal naphthalene-tetracyanobenzene

Time-resolved fluorescence spectroscopy has been applied to study the singlet energy transfer in the charge-transfer crystal naphthalene-tetracyanobenzene (N-TCNB), undoped and doped with anthracene-TCNB (10 −5−10 −2 mole/mole), between helium and room temperature. The transfer is strongly temperatu...

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Bibliographic Details
Published in:Chemical physics 1988-12, Vol.128 (1), p.73-81
Main Authors: Betz, E., Port, H., Schrof, W., Wolf, H.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
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Summary:Time-resolved fluorescence spectroscopy has been applied to study the singlet energy transfer in the charge-transfer crystal naphthalene-tetracyanobenzene (N-TCNB), undoped and doped with anthracene-TCNB (10 −5−10 −2 mole/mole), between helium and room temperature. The transfer is strongly temperature dependent. Hopping transport prevails at room temperature ( t H =4.7 ps). With decreasing temperature self-trapping isgetting more and more effective and the exciton transport is frozen in. At low temperature transport via long-range dipole-dipole interaction remains which is described quantitatively as Forster transfer. An upper limit for the rate of self-trapping is obtained (< 10 ps) from transients of a precursor fluorescence.
ISSN:0301-0104
DOI:10.1016/0301-0104(88)85063-8