Abstract
The performance of two DCM∶ Alq 3 based on red organic light-emitting diodes(OLEDs) were compared.In device A,ultrathin LiF was inserted between emitting layer and electron transporting layer,the other without inserting layer was named device B.As a result,device A showed a maximum EQE(external quantum efficiency) of 5.9%,which was obtained under the highest brightness 76 740 cd / m 2 with current density of 487 mA / cm 2.Correspondingly,the internal quantum efficiency of 40% was far exceeded the theoretical upper limit of 25% for fluorescent OLEDs.We attributed the unusual phenomenon to the manipulation of the charge transfer state mixing and the electrical field effect on the excitons.
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