Two-dimensional-growth small molecular hole-transporting layer by ultrasonic spray coating for organic light-emitting devices |
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| Affiliation: | 1. State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, Changchun, 130012, People''s Republic of China;2. Department of Physics, Quanzhou Normal College, Quanzhou, 362000, People''s Republic of China;1. Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China;2. National & Local United Engineering Laboratory for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China;1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany;2. Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany;3. Graduate School Materials Science in Mainz, Staudingerweg 9, 55128, Mainz, Germany;4. Holst Centre, High Tech Campus 31, 5656AE, Eindhoven, The Netherlands;5. Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629, HS, Delft, The Netherlands;1. Department of Engineering, CERN, 1211 Geneva, Switzerland;2. Department of Engineering, University of Sannio, Benevento, Italy;1. School of Science, Huzhou University, Huzhou, 313000, Zhejiang Province, China;2. Key Lab of Optoelectronic Materials and Devices, Huzhou University, Huzhou, 313000, Zhejiang Province, China;3. School of Engineering, Huzhou University, Huzhou, 313000, Zhejiang Province, China |
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| Abstract: | Two-dimensional-growth small molecular organic thin film with high quality is fabricated by ultrasonic spray coating technology (USC) from the toluene solution of 4,4′,4″-tris (carbazol-9-yl) triphenylamine (TCTA). In comparison to the vacuum thermal evaporation (VTE) TCTA film, the USC-TCTA film obtained from liquid-phase solution possesses more uniform surface topography. The differences between the USC-TCTA and the VTE-TCTA in optical property, electrical property and formation mechanism are also studied in detail. Besides, to evaluate the hole transport and electron blocking ability of USC-TCTA film, the organic light-emitting devices (OLEDs) employing USC-TCTA film as hole transport layer are fabricated successfully. Additionally, the green OLEDs based on USC-TCTA film perform as well as the ones with VTE-TCTA film in current density, luminance, efficiency and color stability, and show even better tolerance to high bias voltage. |
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| Keywords: | Ultrasonic spray coating process Small molecule Hole transport layer Organic light-emitting device |
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