SEARCH Articles Figures Tables Charge injection properties, organic light emitting diode structure Electron injection organic light emitting diode structure Emitting diode Hole injection organic light emitting diode structure Light organic Light structures Light-emitting diode Lighting light-emitting diodes Organic diodes Organic emitting diodes Organic light emitting diode structural properties Organic light-emitting Organic light-emitting diodes Organic light-emitting diodes device structure Structural organization Structure organization TPD complexes organic light emitting diode structure Twin molecules organic light emitting diode structure