Abstract
We have demonstrated efficient blue electrophosphorescent organic light-emitting diodes(PHOLEDs) with double light-emitting layers(D-BOLED),by doping both hole and electron transport layers with iridium(Ⅲ) bis[(4,6-di-fluorophenyl)-pyridinato-N,C2′] picolinate(FIrpic),simultaneously.The D-BOLED showed a peak efficiency of 23.4 cd/A,which was improved about 36.8% compared to the conventional blue PHOLEDs with a single light-emitting layer(S-BOLED),by doping either hole or electron transport layer with FIrpic.We have attributed this improvement mainly to that the D-BOLED can efficiently use the triplet excitons that were generated by carrier recombination at the interface of FIrpic∶TCTA/ FIrpic∶TPBI and diffused into FIrpic doped charge transport layers and subsequently decayed radiatively on FIrpic sites.Combining a DCJTB doped color conversion layer with the D-BOLED,we have achieved a WOLEDs with a peak efficiency of 10.7 cd/A and CIE coordinate of(0.33,0.33).
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