TITLE

Improving the performance of polymer light-emitting diodes using polymer solid solutions

AUTHOR(S)
Liu, Jie; Shi, Yijian; Yang, Yang
PUB. DATE
July 2001
SOURCE
Applied Physics Letters;7/30/2001, Vol. 79 Issue 5
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Optical and electronic properties of conjugated polymers can be modified significantly by arranging the polymer chains differently. For example, it is well known that polymer solutions of lower concentrations have different photoluminescence spectra from solutions of higher concentrations. In this manuscript, we demonstrated that such effects can also be achieved in solid states, i.e., in polymer solid solutions consisting of a narrower band-gap material—poly(2-methoxy-5(2′-ethyl-hexyloxy)-1,4-phenylene vinylene (MEH-PPV) with a wider band-gap polymer–poly(9,9-dioctylfluorene). At very low MEH-PPV concentrations, emission spectra of these solid solutions are similar to the photoluminescence spectrum of a diluted MEH-PPV solution in an ordinary organic solvent, suggesting the absence of a significant amount of interchain species. In addition, the electroluminescence efficiency is significant enhanced. Furthermore, the full width at half maximum (FWHM) is dramatically reduced at lower MEH-PPV concentrations, as a result of suppressed interchain interactions. This approach is particularly important for the application to display technology, in which well-defined narrow FWHM emission spectra of red, green, and blue colors are required. © 2001 American Institute of Physics.
ACCESSION #
4864292

 

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