14 November 2007 Fabrication of multi-layered polymer LEDs by resonant infrared pulsed-laser deposition
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Abstract
Multi-layered polymer light-emitting diodes (PLEDs) have been fabricated in a vacuum environment by resonant infrared pulsed-laser deposition of the polymer layers. The light emitter used was poly[2-methoxy-5-(2- ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), and in some cases a layer of the hole-transport polymer poly(3,4 etylenedioxythiophene:polystyrenesulfonate) (PEDOT:PSS) was also laser deposited, resulting in a device structure of ITO/PEDOT:PSS/MEH-PPV/Al. Fourier transform infrared (FTIR) spectroscopy confirmed that neither of the laser-deposited polymers was significantly altered by the deposition process. Laser-fabricated devices displayed electroluminescent spectra similar to those of conventional spin-coated devices, but the differences in electrical characteristics and device efficiency were substantial. These discrepancies can probably be attributed to surface roughness of the deposited polymer layers. With the appropriate refinement of the deposition protocols, however, we believe that this process can be improved to a level that is suitable for routine fabrication of organic electronic components.
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S. L. Johnson, H. K. Park, R. F. Haglund, "Fabrication of multi-layered polymer LEDs by resonant infrared pulsed-laser deposition", Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66550M (14 November 2007); doi: 10.1117/12.734620; https://doi.org/10.1117/12.734620
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