Optical spectroscopy of triplet excitons and charged excitations in poly(p-phenylenevinylene) light-emitting diodes

A. R. Brown, K. Pichler, N. C. Greenham, D. D.C. Bradley, R. H. Friend, A. B. Holmes

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

Sub-gap absorption is measured under forward drive conditions in electroluminescent devices fabricated from thin films of poly(p-phenylenevinylene) sandwiched between electrodes of indium/tin oxide and calcium. Quantitative concentrations of excitations are obtained. Absorption seen at 1.37 eV is due to an allowed transition to a higher-lying state of the excitons formed by capture of positive and negative charges in the polymer. Absorption bands at 0.65 and 1.55 eV are assigned to charged bipolarons which do not directly participate in the electroluminescence process. © 1993.
Original languageEnglish (US)
JournalChemical Physics Letters
Volume210
Issue number1-3
DOIs
StatePublished - Jul 23 1993
Externally publishedYes

Fingerprint

Dive into the research topics of 'Optical spectroscopy of triplet excitons and charged excitations in poly(p-phenylenevinylene) light-emitting diodes'. Together they form a unique fingerprint.

Cite this