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 Alq3 has been
investigated by means of electroluminescence and fluorescence spectroscopy, upon variation of the
Alq3 content in the blend.Adecreased interchain emission is observed upon increasing Alq3 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 Alq3
content. At high doping concentration, direct emission from Alq3 molecules is observed.
CitationKrautz, D. [et al.]. Interchain and intrachain emission branching in polymer light-emitting diode doped by organic molecules. "Applied physics letters", 18 Gener 2010, vol. 96, núm. 3, p. 1-3.
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