Investigation on slot-die coating of hybrid material structure for OLED lightings |
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| Institution: | 1. Sakarya Üniversitesi, Fen-Edebiyat Fakültesi, Fizik Bölümü, 54187 Adapazarı, Turkey;2. Sakarya Üniversitesi, BIMAYAM Biyomedikal, Manyetik ve Yarıiletken Malzemeler Araştırma Merkezi, 54187 Sakarya, Turkey;3. School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK;1. Department of Chemistry, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran;2. Computational Physical Sciences Research Laboratory, School of Nano-Science, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran;3. Chemical Physics Theory Group, Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada, M5S 3H6;1. Institut de Chimie et des Matériaux Paris-Est, GESMAT, UMR 7182 CNRS-Université Paris Est Créteil, 2, Rue Henri-Dunant, 94320 Thiais, France;2. Institut de Chimie et des Matériaux Paris-Est, SPC, UMR 7182 CNRS-Université Paris Est Créteil, 2, Rue Henri-Dunant, 94320 Thiais, France;3. Institut Charles Gerhardt Montpellier AIME, UMR 5253 CNRS-Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier, France;4. Université d’Evry Val d’Essonne, Département de Chimie, Bd François Mitterrand, 91025 Evry Cedex, France;5. ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire OX11 OQX, UK;6. Centre National d’Etudes Spatiales, 18 Avenue Edouard Belin, 31401 Toulouse Cédex 9, France |
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| Abstract: | With an attempt to fabricate large-area OLED lighting panels, we investigate slot-die coating of a small molecule (SM) hole transport layer (HTL). It is observed that SM HTL films formed by spin coating exhibit pinhole-like surface, whereas the films by slot-die coating show micro-sized hillocks due to agglomeration. As the plate temperature of the slot coater is increased, smaller hillocks appear more densely. To tackle it, a small amount of a polymer HTL is added into the SM HTL (Hybrid HTL). By the aid of entangled polymer chains, small molecules are prohibited from migrating and thus agglomerations disappear. The peak-to-peak roughness of the slot-coated hybrid HTL films is measured to be about 11.5 nm, which is slightly higher than that (~7 nm) of the polymer HTL film, but much lower than that (~1071 nm) of the SM HTL film. Similar results are also observed in spin-coated films. It is also addressed that OLED with the hybrid HTL shows higher luminous efficacy, compared to OLED with the SM HTL or the polymer HTL. We have further demonstrated that the dissolution problem occurring between two stacked layers with different solvents during slot-die coating can be suppressed to a great extent using such a combination of materials in hybrid structure. |
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| Keywords: | Slot-die coating Organic light-emitting diodes (OLEDs) Small molecules Polymer Agglomeration |
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