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Interchain and intrachain emission branching in polymer light-emitting diode doped by organic molecules
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Image of FIG. 1.

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FIG. 1.

Current density (filled symbols) and luminance (open symbols) vs electric field curves of the blend-based device for various percentages of in the blend.

Image of FIG. 2.

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FIG. 2.

Normalized EL spectra for various concentrations in the blend as active layer. The indicates a nodal point at 520 nm, while the and indicate the fluorescence transitions.

Image of FIG. 3.

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FIG. 3.

CW PL of (solid orange curve), MEH-PPV (solid black curve) and the blend for contents from 5% up to 60%. Inset shows the intensity ratio of the interchain and the intrachain emission for both EL (open square) and PL (filled circle) spectra.

Image of FIG. 4.

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FIG. 4.

Time resolved PL of MEH-PPV alone (a), (b), and (c). The curves correspond to PL spectrum collected in various time intervals after the excitation pulse. All the spectra are normalized to their maxima. The notations M1 to M3 refer to the excimer emission component in the spectra, while M4 refers to the emission contribution.

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/content/aip/journal/apl/96/3/10.1063/1.3276271
2010-01-20
2014-04-16

Abstract

A blend of the polymer poly[2-(2-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) and the electron-transport molecule tris-(8-hydroxyquinoline) aluminum has been investigated by means of electroluminescence and fluorescence spectroscopy, upon variation of the content in the blend. A decreased interchain emission is observed upon increasing content, due to lower packing of the MEH-PPV chains which leads to a reduction in the interchain interaction, excimer formation, and emission probability. A branching of MEH-PPV interchain and intrachain emissive contributions is clearly time resolved and analyzed as a function of the content. At high doping concentration, direct emission from molecules is observed.

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Scitation: Interchain and intrachain emission branching in polymer light-emitting diode doped by organic molecules
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/3/10.1063/1.3276271
10.1063/1.3276271
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