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Efficient organic light-emitting diodes with C60 buffer layer
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DOI：10.1016/j.displa.2008.10.001.png)
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Organic light-emitting diodes (OLEDs) with C-60 buffer layer were fabricated. The effect of C-60 buffer layer on the performance of the devices was investigated by inserting C-60 buffer layer at the interface between the electrode and organic layers. The device Structures were (1) ITO/C-60 (0.0, 0.4, 0.7 and 1.0 nm)/NPB/Alq3/LiF/Al and (2) ITO/NPB/Alq(3)/C-60 (0.0, 0.4, 0.7 and 1.0 nm)/LiF/Al. The highest brightness and efficiency of the device (1) with 0.7 nm-thick C-60 layer reached 6439 cd/m(2) at 16 V and 1.80 cd/A at 6.4 V, respectively. The enhancements in brightness and efficiency are attributed to an improved balance of hole and electron injections due to C-60 layer blocking parts of the injected holes. On the contrary, the brightness and efficiency of the devices with the Structure (2) had been hardly enhanced. (c) 2008 Published by Elsevier B.V.
Keyword:
C-60
Buffer layer
Balance of carriers
Organic light-emitting diodes (OLEDs)
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