Comparative Study of Single and Dual Gain-Narrowed Emission in Thiophene/Furan/Phenylene Co-Oligomer Single Crystals
| Autor: | T. Kanagasekaran, Susumu Ikeda, Hiroyuki Tamura, Hidekazu Shimotani, Yoshinori Yamamoto, Naoki Asao, Tienan Jin, Hui Shang, Katsumi Tanigaki, Masayuki Yoshizawa, Kazuaki Oniwa, Miyuki Kanno, K. Abe |
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| Přispěvatelé: | UCL - SST/IMCN/NAPS - Nanoscopic Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Amplified spontaneous emission
Materials science 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Emission intensity Molecular physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Organic semiconductor chemistry.chemical_compound General Energy chemistry Phenylene Excited state Thiophene Physical and Theoretical Chemistry 0210 nano-technology Absorption (electromagnetic radiation) Excitation |
| Zdroj: | The Journal of Physical Chemistry C, Vol. 121, no.4, p. 2364-2368 (2017) |
| Popis: | Three organic semiconductors consisting of thiophene, furan, and phenylene groups showed either one or two gain-narrowed emission peaks by excitation with a laser pulse. The two gain-narrowed emission peaks are optically studied and assigned to 0 → 1 and 0 → 2 vibronic transitions. The number of gain-narrowed emission peaks is determined by a degree of overlap of the vibronic emissions with ground-state and excited-state absorption of the material. Dependence of the gained emission intensity both on the total input energy and the density of the excited states shows that the two gain-narrowed peaks are attributed to two different decay processes: amplified spontaneous emission (ASE) and superfluorescence (SF). The input energy to be conserved in total is distributed between ASE and SF processes strongly dependent on the transition probability and the self-absorption of organic semiconductors as a gain media. |
| Databáze: | OpenAIRE |
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