Extrinsic optical recombination in pentacene single crystals: Evidence of gap states

Rui He, X. Chi, Aron Pinczuk, D. V. Lang, A. P. Ramirez

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Two luminescence bands observed in pentacene single crystals with different degrees of purity are identified as due to extrinsic optical emissions. A band at 1.49 eV remains in the crystal with the highest purity. Its redshift of about 0.3 eV from the free exciton optical recombination suggests that the extrinsic transitions could involve gap states recently discovered in pentacene transistors. Absence of resonance Raman scattering when photon energies overlap the extrinsic recombination suggests that the gap states are likely due to impurities. The temperature dependence of luminescence intensities is interpreted by activated decay of excitons to radiative and nonradiative states.

Original languageEnglish
Article number211117
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number21
DOIs
StatePublished - 2005

Fingerprint Dive into the research topics of 'Extrinsic optical recombination in pentacene single crystals: Evidence of gap states'. Together they form a unique fingerprint.

  • Cite this