Revealing enhanced dilution effect of conjugated polymers in partially miscible blends
Abstract Recent experiments have shown that hole traps could be suppressed in polymer light‐emitting diodes under current stress by diluting the light‐emitting conjugated polymers within an “inert” large‐bandgap host material. However, it is unclear why there is an enhanced dilution effect in partia...
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Wiley
2025-01-01
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| Online Access: | https://doi.org/10.1002/agt2.649 |
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| author | Hongbo Chen Ming Hu Yuehua Zhao Kaixuan Lyu Yushuai Xu Yuansheng Sun Zhiyuan Xie Jinying Huang Dapeng Wang |
| author_facet | Hongbo Chen Ming Hu Yuehua Zhao Kaixuan Lyu Yushuai Xu Yuansheng Sun Zhiyuan Xie Jinying Huang Dapeng Wang |
| author_sort | Hongbo Chen |
| collection | DOAJ |
| description | Abstract Recent experiments have shown that hole traps could be suppressed in polymer light‐emitting diodes under current stress by diluting the light‐emitting conjugated polymers within an “inert” large‐bandgap host material. However, it is unclear why there is an enhanced dilution effect in partially miscible blends rather than fully miscible blends, as intuition would suggest that better miscibility leads to better dilution. In this work, we propose a cascade analysis by combining multiple fluorescence microscopic techniques and all‐atom molecular dynamics simulations to study the solid‐to‐solid dilution of poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV) in MEH‐PPV/polystyrene (PS) blends and MEH‐PPV/poly(vinylcarbazole) (PVK) blends. By varying the molecular weights of PS and PVK, we can regulate their miscibility with MEH‐PPV. The results corroborate that the dilution effect is enhanced in partially miscible blends rather than fully miscible ones. This is because, in partially miscible blends undergoing phase separation, the concentration of MEH‐PPV is notably decreased in the phase occupying the majority of the volume, leading to an overall greater dilution effect than in fully miscible blends. Moreover, MEH‐PPV could adopt the more extended conformation in the fully miscible blend, causing a shorter intermolecular distance to further undermine the dilution effect. These findings explain the seemingly counterintuitive more effective dilution effect observed in the recently reported partially miscible blends and provide guidance for further enhancing the performance of future generations of polymer light‐emitting diodes. |
| format | Article |
| id | doaj-art-d3bb6d54217944069b71d8e4c8677716 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| spelling | doaj-art-d3bb6d54217944069b71d8e4c86777162025-01-21T08:57:07ZengWileyAggregate2692-45602025-01-0161n/an/a10.1002/agt2.649Revealing enhanced dilution effect of conjugated polymers in partially miscible blendsHongbo Chen0Ming Hu1Yuehua Zhao2Kaixuan Lyu3Yushuai Xu4Yuansheng Sun5Zhiyuan Xie6Jinying Huang7Dapeng Wang8State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaISS Inc. Champaign Illinois USAState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun ChinaAbstract Recent experiments have shown that hole traps could be suppressed in polymer light‐emitting diodes under current stress by diluting the light‐emitting conjugated polymers within an “inert” large‐bandgap host material. However, it is unclear why there is an enhanced dilution effect in partially miscible blends rather than fully miscible blends, as intuition would suggest that better miscibility leads to better dilution. In this work, we propose a cascade analysis by combining multiple fluorescence microscopic techniques and all‐atom molecular dynamics simulations to study the solid‐to‐solid dilution of poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV) in MEH‐PPV/polystyrene (PS) blends and MEH‐PPV/poly(vinylcarbazole) (PVK) blends. By varying the molecular weights of PS and PVK, we can regulate their miscibility with MEH‐PPV. The results corroborate that the dilution effect is enhanced in partially miscible blends rather than fully miscible ones. This is because, in partially miscible blends undergoing phase separation, the concentration of MEH‐PPV is notably decreased in the phase occupying the majority of the volume, leading to an overall greater dilution effect than in fully miscible blends. Moreover, MEH‐PPV could adopt the more extended conformation in the fully miscible blend, causing a shorter intermolecular distance to further undermine the dilution effect. These findings explain the seemingly counterintuitive more effective dilution effect observed in the recently reported partially miscible blends and provide guidance for further enhancing the performance of future generations of polymer light‐emitting diodes.https://doi.org/10.1002/agt2.649conjugated polymerdilution effectfluorescence microscopic techniquespartially misciblepolymer blends |
| spellingShingle | Hongbo Chen Ming Hu Yuehua Zhao Kaixuan Lyu Yushuai Xu Yuansheng Sun Zhiyuan Xie Jinying Huang Dapeng Wang Revealing enhanced dilution effect of conjugated polymers in partially miscible blends Aggregate conjugated polymer dilution effect fluorescence microscopic techniques partially miscible polymer blends |
| title | Revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| title_full | Revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| title_fullStr | Revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| title_full_unstemmed | Revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| title_short | Revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| title_sort | revealing enhanced dilution effect of conjugated polymers in partially miscible blends |
| topic | conjugated polymer dilution effect fluorescence microscopic techniques partially miscible polymer blends |
| url | https://doi.org/10.1002/agt2.649 |
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