Low-Cost Fabrication of Organic Photovoltaics and Polymer LEDs - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 240

Fig. 16 The UV-light irradiation for evaluation of the coating quality in the emissive layer, left
films are spin-coated and right films are blade-coated films
Fig. 17 Molecular structure
of the yellow light-emitting
phenyl substituted
poly(phenylene) vinylene
(substrate area: 70 mm 9 80 mm). The lack of the uniformity of the blade-only
coated layers created serious nonuniform luminance when the device was driven
electrically. In comparison, in the blade-slit coated layer the standard deviation
was only 0.68 and 2.3 nm for the PEDOT:PSS and emissive layer S-Y. So non-
uniformity is only 2.1 and 2.2 % of their respective layer thicknesses (Table 4 ). It
exhibited dramatic improvement in film uniformity compared to the blade-only
coating. The electrical performances of PLED devices made of polymer anode are
discussed in Sect. 3 .