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Exciton trapping with coherent emission of phonons at impurities in molecular crystals

Singh, Jai and Thilagam, A. (1987). Exciton trapping with coherent emission of phonons at impurities in molecular crystals. Journal of Luminescence,38(1-6):317-319.

Document type: Journal Article
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Title Exciton trapping with coherent emission of phonons at impurities in molecular crystals
Author Singh, Jai
Thilagam, A.
Journal Name Journal of Luminescence
Publication Date 1987
Volume Number 38
Issue Number 1-6
ISSN 0022-2313   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-45949129514
Start Page 317
End Page 319
Total Pages 3
Place of Publication Netherlands
Publisher Elsevier BV * North-Holland
Field of Research PHYSICAL SCIENCES
Abstract The process of exciton trapping at impurities with deep trap depths is studied in molecular crystals assuming that the excess exciton energy can be emitted in the form of coherent phonons. We represent the state of emitted phonons by coherent states and derive rates of exciton trapping for isotopic impurities. The calculation is done with acoustic as well as optical phonons. In naphthalene crystals with impurities of trap depth 350 cm-1 rates are calculated in terms of the coherent state parameter |α|. For 1.1 ≤ |α| ≤1.8 it is found that the rate of acoustic phonon emission is 1016 s-1 and of optical phonon emission is 1018 s-1. Such high rates suggest that a laser-like new source of intense and coherent phonon energy can be designed.
DOI http://dx.doi.org/10.1016/0022-2313(87)90139-6   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Fri, 29 Aug 2014, 20:30:35 CST by Anthony Hornby