Influence of Molecular Orientation in Organic Light-Emitting Diodes

Takeshi KOMINO, Hiroyuki TANAKA, Hiroko NOMURA, Takahiro KOYANAGI, Chihaya ADACHI
2014 Hyomen Kagaku  
Controlling molecular orientations in non-crystalline thin films fabricated from small molecules by varying the substrate temperature during the vapor deposition, influences of molecular orientation in organic light-emitting diodes were investigated. With the randomly oriented host matrix in a light-emitting layer, efficiency roll-off was suppressed by 30% at a current density of 100 mA cm −2 , while the external electroluminescence quantum efficiency was greatly enhanced by 24% with the
more » ... tal orientation of a linear-shaped fluorescent dopant.
doi:10.1380/jsssj.35.178 fatcat:tt3bswitqvfjflbgfmnb2e35nm