Hibon, Pauline (2020)
Improving the interface stability of cross-linked films by ink formulation in printed organic light emitting diodes.
Technische Universität Darmstadt
doi: 10.25534/tuprints-00014138
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Improving the interface stability of cross-linked films by ink formulation in printed organic light emitting diodes | ||||
Language: | English | ||||
Referees: | von Seggern, Prof. Dr. Heinz ; Dörsam, Prof. Dr. Edgar | ||||
Date: | 5 October 2020 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | iii, 129 Seiten | ||||
Date of oral examination: | 11 September 2020 | ||||
DOI: | 10.25534/tuprints-00014138 | ||||
Abstract: | Interface control remains a top challenge of solution‐processed organic light emitting diodes (OLED) stacks since the device performance heavily relies on it. Film stability of an inkjet deposited and crosslinked layer against subsequent exposure to a suitable inkjet printed solvent has been investigated. Impact of processing solvent (solvent used to prepare the polymer layer) on solution‐cast thin film properties has already been shown for polymer films. This study is the first one analyzing thin films stability against solvent exposure using technology relevant materials processed via inkjet printing (IJP). The outcome of this research showed that the stability of the crosslinked films is affected by the solvent used for ink formulation. These findings are of great interest for multilayered semiconductors devices, such as OLEDs, field‐effect transistors and dye‐sensitized solar cells. Differential scanning calorimetry (DSC) was used to quantify the efficiency of the polymer crosslinking reaction in pure powder and in thin films, as processed from different solvents. Crosslinking efficiency measured by DSC correlated well with the deformation induced by the solvent and observed on layer surfaces. The interaction in solution between polymer and solvent has also been evaluated to explain its impact on thin film stability against successive solvent printing. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-141382 | ||||
Classification DDC: | 500 Science and mathematics > 530 Physics 500 Science and mathematics > 540 Chemistry 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering |
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Divisions: | 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Electronic Materials |
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Date Deposited: | 14 Dec 2020 08:34 | ||||
Last Modified: | 29 Sep 2022 12:55 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/14138 | ||||
PPN: | 473883627 | ||||
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