Spectrally narrowed edge emission from organic light-emitting diodes

TitleSpectrally narrowed edge emission from organic light-emitting diodes
Publication TypeJournal Article
Year of Publication2007
AuthorsTian Y, Gan ZQ, Zhou ZQ, Lynch DW, Shinar J, Kang JH, Park QH
Journal TitleApplied Physics Letters
Volume91
Pages143504
Date PublishedOct
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberISI:000249974100118
KeywordsAMPLIFIED SPONTANEOUS EMISSION, devices, EXCITATION, INJECTION, LASERS, MODE, POLYMER, thin-films
Abstract

A dramatic spectrally narrowed edge emission (SNEE) from small molecular organic light-emitting diodes at room temperature, with a full width at half maximum of 5-10 nm, is described. The results show that this emission is due to irregular waveguide modes that leak from the indium tin oxide anode to the glass substrate at a grazing angle. Measurements of variable stripe length devices exhibit an apparent weak optical gain, but there is no observable threshold bias associated with this SNEE. Hence this apparent "optical gain" is suspected to result from misalignment of the propagating leaky waveguide mode and the collecting optics. (c) 2007 American Institute of Physics.

DOI10.1063/1.2778358
Alternate JournalAppl. Phys. Lett.