Hole injection polymer effect on degradation of organic light-emitting diodes |
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Authors: | Song Chen Xuezhong Jiang Franky So |
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Affiliation: | 1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611-6400, United States;2. Air Products and Chemicals, Inc., Allentown, PA 18195, United States |
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Abstract: | Polythienothiophene:poly(perfluoroethylene-perfluoroethersulfonic acid) (PTT:PFFSA) has been used to enhance hole injection into small molecule OLEDs. Compared to devices with polyethylene dioxythiophene polystyrene sulfonate (PEDOT:PSS) as the hole injection layer (HIL), the OLED using PTT:PFFSA as a HIL gives enhanced efficiency and a slower luminance decay as well as a slower rise in operating voltage. Further studies of capacitance–voltage characteristics reveal that positive trapped charges accumulate in the hole transporting layer during operation. These results thus highlight the significance of hole injection layer to OLED operational stability. |
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Keywords: | Organic light emitting diode Hole injection layer Degradation Lifetime Capacitance |
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