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High-performance polymer light-emitting diodes utilizing modified Al cathode
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DOI：10.1063/1.1984101.png)
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摘要
En 中文
We report an increase of electroluminescence (EL) efficiency by two orders of magnitude for poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) based polymer light-emitting diodes (PLED) while employing Al as the cathode with an ultrathin layer of poly(ethylene oxide) (PEO). EL efficiencies of MEH-PPV PLEDs biased at 10 mA were found to be 0.017 cd/A at 31 cd/m(2), 1.50 cd/A at 2515 cd/m(2), and 4.96 cd/A at 8416 cd/m(2) for applying Al, PEO/Al, and PEO/LiF/Al as the device cathodes, respectively. The significant improvement in the device performance is attributed to the promotion of minority carrier injection (electrons), where the threshold of the injection can be characterized through the deviation of Fowler-Nordhiem tunneling prediction. (c) 2005 American Institute of Physics.
Keyword:
ORGANIC ELECTROLUMINESCENT DEVICES
ALUMINUM CATHODE
ELECTRON
EFFICIENCY
INJECTION
EMISSION
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3.6
论文数:
10.4W
被引数:
17.8W
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