Efficient white organic light-emitting devices using 4,7-diphenyl-1,10-phenanthroline as block layer |
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Authors: | Huishan Yang Yanwei Shi Jingying Hou |
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Institution: | a National Laboratory of Integrated Optoelectronics, Jilin University, Changchun 130012, People's Republic of China b Department of Physics, Quanzhou Normal University, Quanzhou 362000, People's Republic of China |
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Abstract: | A white light-emitting device has been fabricated with a structure of ITO/m-MTDATA (45 nm)/NPB (10 nm)/DPVBi (8 nm)/DPVBi:DCJTB 0.5% (15 nm)/BPhen (x nm)/Alq3 (55−x) nm]/LiF (1 nm)/Al, with x=0, 4, and 7. BPhen was used as the hole-blocking layer. This results in a mixture of lights from DPVBi molecules (blue-light) and DCJTB (yellow-light) molecules, producing white light emission. The chromaticity can be readily adjusted by only varying the thickness of the BPhen layer. The CIE coordinates of the device are largely insensitive to the driving voltages. When the thickness of BPhen is 7 nm, the device exhibits peak efficiency of 6.87 cd/A (3.59 lm/W) at the applied voltage of 6 V, the maximum external quantum efficiency ηext=2.07% corresponding to 6.18 cd/A, and the maximum brightness is 18494 cd/m2 at 15 V. |
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Keywords: | 85 60 Jb 81 15 Ef 78 60 Fi |
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