Lowering the driving voltage and improving the luminance of blue fluorescent organic light-emitting devices by thermal annealing a hole injection layer of pentacene |
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| Affiliation: | 1.School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300222, China;2.Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300222, China;3.Tianjin Key Laboratory of Photoelectric Materials and Devices, Tianjin 300222, China |
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| Abstract: | We chose pentacene as a hole injection layer (HIL) to fabricate the high performance blue fluorescent organic light-emitting devices (OLEDs). We found that the carrier mobility of the pentacene thin films could be efficiently improved after a critical annealing at temperature 120 °C. Then we performed the tests of scanning electron microscopy, atomic force microscopy, and Kelvin probe to explore the effect of annealing on the pentacene films. The pentacene film exhibited a more crystalline form with better continuities and smoothness after annealing. The optimal device with 120 ℃ annealed pentacene film and n-doped electron transport layer (ETL) presents a low turn-on voltage of 2.6 V and a highest luminance of 134800 cd/m2 at 12 V, which are reduced by 26% and improved by 50% compared with those of the control device. |
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| Keywords: | organic light-emitting device (OLED) annealing pentacene film hole injection |
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