Abstract
Efficiency and its roll-off are improved by using double electron transport layers( DETLs)in organic light-emitting diodes( OLEDs). When DETLs of Bphen/BCP are employed,device efficiency is enhanced by 10% compared to the device with single Bphen as an electron transport layer( ETL) because of lower hole leakage current. Meanwhile,due to more electrons injected,efficiency roll-off of 0% is observed for the Bphen/BCP-based device with the increase of current density from 50 to 600 m A/cm2. On the contrast,the device with single BCP as ETL has an efficiency rolloff of 16%,which is reduced from 2. 5 cd/A at 50 m A/cm2 to 2. 1 cd/A at 300 m A/cm2. Compared to the Cs2CO3∶ BCP-ETL-based device with an efficiency roll-off of 30% from 50 to 300 m A /cm2,device efficiency is declined by 0% within the range from 50 to 600 m A/cm2 as DETLs of Bphen/Cs2CO3∶ BCP are explored. The reason is the blocking of Cs atom interdiffusion into the emissive layer by the Bphen of Bphen/Cs2CO3∶ BCP.
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