Improved device efficiency and color purity: Spectral redshift and line narrowing for poly [2-methoxy,5-(2-ethylhexyloxy)-1,4-phenylenevinylene] via blending with phenyl-substituted poly [p-phenylene vinylene] derivatives

Yong Zhang; Junbiao Peng; Yueqi Mo; Yong Cao
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5170
Academic Journal
Highly efficient light-emitting diodes with redshifted narrow emission were realized based on blends of poly [2-methoxy,5-(2-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) and phenyl-substituted poly [p-phenylene vinylene] derivative (P-PPV). EL emissions of blend device were redshifted about 18 nm from the peak emission of 582 nm for neat MEH-PPV device to around 600 nm for devices from the blend film. The full width at half maximum of MEH-PPV emission from blend film was reduced from 91 to 36 nm. The external quantum and luminous efficiencies of devices from blend films (MEH-PPV:P-PPV=20:80) reached 5.27% and 4.71 cd/A, respectively. The effective energy transfer and solid-state dilution effect of MEH-PPV in P-PPV host were thought of as the origin of the performance enhancement.


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