Densities of states and band widths of excitons in anthracene microcrystallites embedded in PMMA

A new technique to determine the k = 0 components in the density of states (DOS) and band widths of excitons in microcrystallites is demonstrated. Applying the technique to anthracene microcrystallites, it is found that DOS shows up as a broad tail which extends towards higher energies, in addition...

Full description

Saved in:
Bibliographic Details
Published inChemical physics Vol. 194; no. 1; pp. 167 - 174
Main Authors Matsui, A.H., Mizuno, K., Nishi, O., Matsushima, Y., Shimizu, M., Goto, T., Takeshima, M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.1995
Online AccessGet full text

Cover

More Information
Summary:A new technique to determine the k = 0 components in the density of states (DOS) and band widths of excitons in microcrystallites is demonstrated. Applying the technique to anthracene microcrystallites, it is found that DOS shows up as a broad tail which extends towards higher energies, in addition to sharp peaks. The width of the tail, representing the exciton band width, takes its maximum value of 340 cm −1 for microcrystallites of 65 Å, but it becomes narrower as the size of microcrystallites reduces. For microcrystallites with a diameter larger than 65 Å, the observed band width decreases asymptotically to 300 cm −1, which represents the band width of a bulk crystal.
ISSN:0301-0104
DOI:10.1016/0301-0104(95)00024-I