Optical Outcoupling Efficiency in Polymer Light‐Emitting Diodes

Abstract The electrical properties of polymer‐based light‐emitting diodes (PLEDs) have been extensively studied, resulting in quantitative device models. However, for a complete description the optoelectronic PLED, obtained recombination profiles need to be integrated with an optical model describing local outcoupling efficiency generated light. In this work, combined and calculations are presented, demonstrating that light‐outcoupling PLEDs is governed by presence electron traps anisotropy factor dipoles. Electron trapping confines region close cathode, strong surface plasmon polariton modes. Trap‐filling leads voltage‐dependent profile efficiency. For typical trap density ≈10 23 m −3 , calculated raises from 5.5% at 2 V 10.4% 5 case isotropic emitters. conjugated polymers such as super yellow poly( p ‐phenylene vinylene) chains preferentially aligned plane film, can reach ≈18% V. Elimination would allow further enhancement up 24%.