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华东理工大学理学院物理系 上海,200237
纸质出版日期:2015-9-3,
收稿日期:2015-6-24,
修回日期:2015-7-23,
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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.
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
2
的电流范围内没有衰减。BCP作ETL的器件的效率从50mA/cm
2
时的2.5cd/A衰减至300mA/cm
2
的2.1cd/A
衰减了16%。Cs
2
CO
3
:BCP独自作ETL的器件效率在50~300mA/cm
2
的电流范围内衰减了30%
而Bphen/Cs
2
CO
3
:BCP作DETLs的器件效率在50~600mA/cm
2
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。
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
2
. 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
2
to 2.1cd/A at 300mA/cm
2
. Compared to the Cs
2
CO
3
:BCP-ETL-based device with an efficiency roll-off of 30% from 50 to 300 mA/cm
2
device efficiency is declined by 0% within the range from 50 to 600 mA/cm
2
as DETLs of Bphen/Cs
2
CO
3
:BCP are explored. The reason is the blocking of Cs atom interdiffusion into the emissive layer by the Bphen of Bphen/Cs
2
CO
3
:BCP.
发光效率效率衰减电子传输层泄漏电流
luminous efficiencyefficiency roll-offelectron transport layerleakage current
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