AI Article Synopsis
- The study explores how varying the molecular weight of conjugated polymers in blends leads to phase-separated thin film structures with both lateral and vertical orientations.
- Micrometer-scale lateral phase separation is essential for maximizing initial efficiency in light-emitting diodes (LEDs), while a balance in charge carrier mobilities and uniform film thickness is vital for sustaining high efficiency at elevated voltages.
- The optoelectronic characteristics of these polymer blends and their corresponding devices are significantly affected by the arrangement of polymer chains and the conditions at the interfaces of polymer heterojunctions.
Article Abstract
We report laterally and vertically phase-separated thin film structures in conjugated polymer blends created by polymer molecular weight variation. We find that micrometer-scale lateral phase separation is critical in achieving high initial device efficiency of light-emitting diodes, whereas improved balance of charge carrier mobilities and film thickness uniformity are important in maintaining high efficiency at high voltages. The optoelectronic properties of these blend thin films and devices are strongly influenced by the polymer chain order/disorder and the interface state formed at polymer/polymer heterojunctions.
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| http://dx.doi.org/10.1021/nl9025105 | DOI Listing |
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