| abstract |
Light extraction from wet-coated OLED devices may be improved by optimizing the charge injection or transport layers to direct more light into a supporting substrate, thus maximizing the final light extraction efficiency. Accordingly, in one aspect, the present invention relates to an optoelectronic device (20) that has at least one charge carrier injecting or transporting layer (3) that includes inorganic nanoparticles (11, 12) having a bimodal particle size distribution and dispersed in an organic matrix. In another aspect, the present invention relates to an optoelectronic device (10) that includes an electron transporting layer (6) comprising inorganic nanoparticles (11) dispersed in an organic matrix. In yet another aspect, the present invention relates to an optoelectronic device (30, 40) wherein the surface of the electron transporting layer (6) that is contiguous to the cathode is uneven (14). In yet another aspect, the present invention relates to an optoelectronic device comprising • a substrate; • an anode; • a cathode; • an electroluminescent layer; and • electron transporting layer comprising a fluoro compound of formula I (Ar 2 ) n -Ar 1 -(Ar 2 ) n I wherein Ar 1 is C 5-C 40 aryl, C 5 -C 40 substituted aryl, C 5 -C 40 heteroaryl, or C 5 -C 40 substituted heteroaryl; • Ar 2 is, independently at each occurrence, fluoro- or fluoroalkyl- substituted C 5-40 heteroaryl; and • n is 1, 2, or 3. |