Polyethyleneoxide/sodium dodecyl sulfate as hole-blocking/electron-transporting layer for high-performance blue polymer light-emitting diode with oxygen- and moisture-stable aluminum cathode

Jiun-Shian Wu; Hsin-Hung Lu; Wei-Chun Hung; Guan-Hong Lin; Show-An Chen
July 2010
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p023304
Academic Journal
We present the case of the blend of polyethyleneoxide (PEO) with sodium dodecyl sulfate (SDS) as a hole-blocking (HB)/electron-transporting (ET) layer to allow the use of oxygen- and moisture-stable aluminum (Al) as the cathode for achieving high-performance polymer light-emitting diode. With inserting the PEO-SDS layer (at the weight ratio 1:1.25), the blue-emitting device with poly(9,9-di-n-octylfluorene) exhibits the maximum brightness 12 300 cd/m2 and current efficiency 2.8 cd/A, much higher than the device without this layer (0.3 cd/m2 and 0.005 cd/A) and that using CsF/Al as the cathode (5835 cd/m2 and 1.06 cd/A). This HB-ET layer can also improve the performances of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene]-based device with Al as the cathode.


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