Molecular relaxation temperature effects on emission efficiency of Organic Light-Emitting Diodes

► Molecular relaxation temperature and electric field effects on the emission efficiency of in Organic Light-Emitting Diode. ► Effects of electrode/polymer and polymer/polymer interfaces. ► Photo-excited carriers' energy transfer for the sample at different temperatures and polarizing biases. ► Enhance the emission efficiency of luminescence polymers by controlling the molecular relaxation temperatures.