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Jun Liu, Jing Wang, Saijun Huang, Hsi-An Chen and Gufeng He Improved efficiency of blue phosphorescence organic light-emitting diodes with irregular stepwise-doping emitting layers physica status solidi (a) 210

Version of Record online: 11 JAN 2013 | DOI: 10.1002/pssa.201228727

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A stepwise doping emitting layer is considered as an effective way to control the charge transport and recombination in organic light-emitting diodes (OLEDs). It has been demonstrated that the irregular stepwise doping profile in the emitting layer can deliver better charge carrier balance and tune the recombination zone away from the low triplet energy electron transporting layer to avoid possible quenching. Both effects improve the efficiency significantly. It is anticipated that this method can also be applied to other emitting systems to realize better performance.

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