A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Integration of light management solutions relying on biodegradable materials in organic light-emitting devices could assist the development of sustainable light sources or conformable and wearable display technology. U...
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| Format: | Article |
| Language: | English |
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Wiley
2021
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| Online Access: | https://hdl.handle.net/1721.1/134353 |
| _version_ | 1811091836489433088 |
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| author | Jürgensen, Nils Fritz, Benjamin Mertens, Adrian Tisserant, Jean-Nicolas Kolle, Mathias Gomard, Guillaume Hernandez-Sosa, Gerardo |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Jürgensen, Nils Fritz, Benjamin Mertens, Adrian Tisserant, Jean-Nicolas Kolle, Mathias Gomard, Guillaume Hernandez-Sosa, Gerardo |
| author_sort | Jürgensen, Nils |
| collection | MIT |
| description | © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Integration of light management solutions relying on biodegradable materials in organic light-emitting devices could assist the development of sustainable light sources or conformable and wearable display technology. Using industrially relevant processing techniques, it is shown that microlens arrays can be seamlessly integrated into flexible and biodegradable cellulose diacetate substrates to facilitate extraction of the trapped substrate modes in light-emitting electrochemical cells. The substrates are patterned for light extraction and optimized for scalable printing processes in a single step by thermally embossing microlenses with polydimethylsiloxane molds on one substrate surface and simultaneous flattening of the other. Furthermore, by implementing the biopolymer substrate with microlens arrays, the total volume fraction of biodegradable materials in the microlense equipped device is 99.94%. The embossed microstructures on the biopolymer substrates are investigated by means of scanning electron microscopy and the angular light extraction profile of the devices is measured and compared to ray tracing simulations. Light-emitting electrochemical cells with integrated microlens array substrates achieve an efficiency enhancement factor of 1.45, exceeding conventional organic light-emitting diodes on glass substrates with laminated microlens arrays (enhancement factor of 1.23). |
| first_indexed | 2024-09-23T15:08:31Z |
| format | Article |
| id | mit-1721.1/134353 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:08:31Z |
| publishDate | 2021 |
| publisher | Wiley |
| record_format | dspace |
| spelling | mit-1721.1/1343532023-03-15T19:29:23Z A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices Jürgensen, Nils Fritz, Benjamin Mertens, Adrian Tisserant, Jean-Nicolas Kolle, Mathias Gomard, Guillaume Hernandez-Sosa, Gerardo Massachusetts Institute of Technology. Department of Mechanical Engineering © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Integration of light management solutions relying on biodegradable materials in organic light-emitting devices could assist the development of sustainable light sources or conformable and wearable display technology. Using industrially relevant processing techniques, it is shown that microlens arrays can be seamlessly integrated into flexible and biodegradable cellulose diacetate substrates to facilitate extraction of the trapped substrate modes in light-emitting electrochemical cells. The substrates are patterned for light extraction and optimized for scalable printing processes in a single step by thermally embossing microlenses with polydimethylsiloxane molds on one substrate surface and simultaneous flattening of the other. Furthermore, by implementing the biopolymer substrate with microlens arrays, the total volume fraction of biodegradable materials in the microlense equipped device is 99.94%. The embossed microstructures on the biopolymer substrates are investigated by means of scanning electron microscopy and the angular light extraction profile of the devices is measured and compared to ray tracing simulations. Light-emitting electrochemical cells with integrated microlens array substrates achieve an efficiency enhancement factor of 1.45, exceeding conventional organic light-emitting diodes on glass substrates with laminated microlens arrays (enhancement factor of 1.23). 2021-10-27T20:04:34Z 2021-10-27T20:04:34Z 2021 2020-07-29T15:02:40Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134353 en 10.1002/admt.201900933 Advanced Materials Technologies Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Wiley Wiley |
| spellingShingle | Jürgensen, Nils Fritz, Benjamin Mertens, Adrian Tisserant, Jean-Nicolas Kolle, Mathias Gomard, Guillaume Hernandez-Sosa, Gerardo A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title | A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title_full | A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title_fullStr | A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title_full_unstemmed | A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title_short | A Single‐Step Hot Embossing Process for Integration of Microlens Arrays in Biodegradable Substrates for Improved Light Extraction of Light‐Emitting Devices |
| title_sort | single step hot embossing process for integration of microlens arrays in biodegradable substrates for improved light extraction of light emitting devices |
| url | https://hdl.handle.net/1721.1/134353 |
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