期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 3, 页码 622-632出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz402450m
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资金
- National Science Foundation [DMR-1203811]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1203811] Funding Source: National Science Foundation
The photophysical properties of emissive conjugated polymer (CP) chains are compared to those of linear J-aggregates. The two systems share many properties in common, including, a red-shifted absorption spectrum with increasing chain/aggregate length, enhanced radiative decay rates (superradiance) relative to a single monomer/molecule, and several vibronic signatures involving the vinyl-stretching mode common to many conjugated molecules. In particular, the scaling of the 0-0/0-1 photoluminescence ratio and radiative decay rate with the inverse square root of temperature in red-phase polydiacetylene is also characteristic of linear, disorder-free J-aggregates. The strong photophysical resemblance is traced to the excitonic band structure; in one-dimensional direct band gap semiconductors as well as J-aggregates, the exciton band curvature is positive at the gamma point (k = 0).
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