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Citation: SHI Changsheng, CHEN Jiangshan, MA Dongge. Ultrathin Al/Li₂CO₃ Modified Indium Tin Oxide Cathode for Blue Phosphorescent Inverted Bottom-emission Organic Light-emitting Diodes[J]. Chinese Journal of Applied Chemistry, ;2012, 29(12): 1412-1416. doi: 10.3724/SP.J.1095.2012.20445 shu

Ultrathin Al/Li₂CO₃ Modified Indium Tin Oxide Cathode for Blue Phosphorescent Inverted Bottom-emission Organic Light-emitting Diodes

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: CHEN Jiangshan, MA Dongge,
Received Date: 4 October 2012
Available Online: 15 October 2012
Fund Project: 国家自然科学基金资助项目(60906020) (60906020)

Efficient blue phosphorescent inverted bottom-emission organic light-emitting diode(IBOLED) based on indium tin oxide(ITO) cathode has been successfully fabricated by thermal evaporation using Al(2 nm)/Li₂CO₃(2 nm) as the electron-injection layer.The structure of this device is ITO/Al/Li₂CO₃/SPPO13/SPPO13:FIrpic/TCTA/MoO₃/Al(SPPO13:2,7-bis(diphenylphosphoryl)-9,9'-spirobi[fluorene];FIrpic:bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium;TCTA:4,4',4"-tri(9-carbazoyl)triphenylamine).It is found that the electron injection barrier between ITO and the organic layer can be significantly reduced with the presence of Al/Li₂CO₃,leading to the reduction of the turn-on voltage from 11 V to 4.2 V and the significant enhancement of efficiencies.The inverted device exhibits a maximum current efficiency of 28.2 cd/A and a maximum power efficiency of 19.6 lm/W,which are comparable with the conventional device.This suggests that Al/Li₂CO₃ has the potential to be used as the electron injection layer for inverted OLEDs.
- organic light-emitting diodes,
- inverted bottom-emission,
- electron injection layer,
- indium tin oxide cathode
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通讯作者: 陈斌, bchen63@163.com

Ultrathin Al/Li₂CO₃ Modified Indium Tin Oxide Cathode for Blue Phosphorescent Inverted Bottom-emission Organic Light-emitting Diodes