Improved Efficiency and Its Roll-off of Organic Light-emitting Diodes with Double Electron Transport Layers

LU Qing; CHEN Bing-yue; YANG Wei-qiang; ZHANG Tong-lei; LYU Zhao-yue

doi:10.3788/fgxb20153609.1053

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Improved Efficiency and Its Roll-off of Organic Light-emitting Diodes with Double Electron Transport Layers

更新时间：2020-08-12

- Improved Efficiency and Its Roll-off of Organic Light-emitting Diodes with Double Electron Transport Layers
- Chinese Journal of Luminescence Vol. 36, Issue 9, Pages: 1053-1058(2015)
- 作者机构：
  
  华东理工大学理学院物理系上海,200237
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20153609.1053
  CLC： TN383+.1
- Received：24 June 2015，
  
  Revised：23 July 2015，
  
  Published：03 September 2015
- 稿件说明：
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陆勍, 陈炳月, 杨魏强等. 双电子传输层对有机发光二极管效率及其衰减的改善[J]. 发光学报, 2015,36(9): 1053-1058

LU Qing, CHEN Bing-yue, YANG Wei-qiang etc. Improved Efficiency and Its Roll-off of Organic Light-emitting Diodes with Double Electron Transport Layers[J]. Chinese Journal of Luminescence, 2015,36(9): 1053-1058
陆勍, 陈炳月, 杨魏强等. 双电子传输层对有机发光二极管效率及其衰减的改善[J]. 发光学报, 2015,36(9): 1053-1058 DOI： 10.3788/fgxb20153609.1053.

LU Qing, CHEN Bing-yue, YANG Wei-qiang etc. Improved Efficiency and Its Roll-off of Organic Light-emitting Diodes with Double Electron Transport Layers[J]. Chinese Journal of Luminescence, 2015,36(9): 1053-1058 DOI： 10.3788/fgxb20153609.1053.

摘要

采用Bphen和BCP制成双电子传输层(Doubleelectrontransportlayers

DETLs)的有机发光二极管器件

与Bphen单独作ETL的器件相比

DETLs器件具有较小的空穴漏电流

效率提升10%。与BCP独自作ETL的器件相比

更多的电子注入使DETLs器件的效率在50~600mA/cm

的电流范围内没有衰减。BCP作ETL的器件的效率从50mA/cm

时的2.5cd/A衰减至300mA/cm

的2.1cd/A

衰减了16%。Cs

:BCP独自作ETL的器件效率在50~300mA/cm

的电流范围内衰减了30%

而Bphen/Cs

:BCP作DETLs的器件效率在50~600mA/cm

的电流范围内衰减幅度为0

原因是Bphen阻挡了Cs原子扩散至发光层。

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 mA/cm

. On the contrast

the device with single BCP as ETL has an efficiency roll-off of 16%

which is reduced from 2.5cd/A at 50 mA/cm

to 2.1cd/A at 300mA/cm

. Compared to the Cs

:BCP-ETL-based device with an efficiency roll-off of 30% from 50 to 300 mA/cm

device efficiency is declined by 0% within the range from 50 to 600 mA/cm

as DETLs of Bphen/Cs

:BCP are explored. The reason is the blocking of Cs atom interdiffusion into the emissive layer by the Bphen of Bphen/Cs

:BCP.

关键词

Keywords

references

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