Highly Efficient Energy Transfer in Light Emissive Poly(9,9-dioctylfluorene) and Poly(p-phenylenevinylene) Blend System
| Autor: | Kamran ul Hasan, Muhammad Umair Hassaan, Yee-Chen Liu, Richard H. Friend, Ali K. Yetisen, Haider Butt, Mohsin Rafique |
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| Rok vydání: | 2017 |
| Předmět: |
Amplified spontaneous emission
Materials science Photoluminescence business.industry Exciton 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Polyfluorene chemistry.chemical_compound Förster resonance energy transfer chemistry Optoelectronics Quantum efficiency Polymer blend Electrical and Electronic Engineering Time-resolved spectroscopy 0210 nano-technology business Biotechnology |
| Zdroj: | ACS Photonics. 5:607-613 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.7b01177 |
| Popis: | A polymer blend system F81–x:SYx based on poly(9,9-dioctylfluorene) (F8) from the family of polyfluorenes (PFO) and a poly(para-phenylenevinylene) (PPV) derivative superyellow (SY) shows highly efficient energy transfer from F8 host to SY guest molecules. This has been realized due to a strong overlap between F8 photoemission and SY photoabsorption spectra and negligibly low self-absorption. The steady-state and time-correlated spectroscopic measurements show an increased photoluminescence quantum efficiency (PLQE) and lifetime (τ) of SY, with an opposite trend of decreasing PLQE and τ of F8 excitons with increasing SY concentration, suggesting the Forster resonance energy transfer (FRET) to be the main decay pathway in the proposed system. The systematic study of the exciton dynamics shows a complete energy transfer at 10% of SY in the F8 host matrix and a Forster radius of ∼6.3 nm. The polymer blend system exhibits low laser and amplified spontaneous emission thresholds. An ultrahigh efficiency (27 cd·A... |
| Databáze: | OpenAIRE |
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