Picosecond spectroscopy of polaritons in anthracene crystals II. Luminescence |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin Chengjian University, 300384 Tianjin, China;2. Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, 300384 Tianjin, China;1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, PR China;2. V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 03028, Kyiv, Ukraine;3. Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX, 77204-5002, United States;4. Physics Faculty, Taras Shevchenko National University of Kyiv, 01601, Kyiv, Ukraine;5. Institute of Materials for Electronics and Magnetism, IMEM-CNR, I-43124, Parma, Italy;6. Faculty of Intelligent Manufacturing, Wuyi University, 529020, Jiangmen, PR China;1. Department of Physics, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marques de São Vicente, 22451-900 Rio de Janeiro, Brazil;2. INL – International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal;3. Department of Chemistry, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marques de São Vicente, 22451-900 Rio de Janeiro, Brazil;4. Department of Informatics, Università di Verona, Strada le Grazie 15, I-37134 Verona, Italy;5. CBPF – Brazilian Center for Research in Physics, R. Dr. Xavier Sigaud, 150 – Urca, Rio de Janeiro, RJ 22290-180, Brazil;6. PostGraduate Program on Translacional Biomedicine, University of Grande Rio (UNIGRANRIO), Rio de Janeiro, Duque de Caxias, RJ 25071-202, Brazil;7. Division of Metrology of Materials, National Institute of Metrology, Standardization and Industrial Quality (INMETRO), Duque de Caxias, RJ 25250-020, Brazil |
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| Abstract: | The low-temperature luminescence spectrum of anthracene crystals is investigated by applying simultaneous time and frequency resolution. The complicated kinetics of the emission in the polariton bottleneck region reflects directly the evolution and relaxation of the polariton distribution in the crystal. Three distinct relaxation stages are distinguished: (1) the ultrafast decay of initial vibronic excitations, mediated by optical phonons and resulting in a broad distribution of polaritons near the band bottom; (2) the formation of a narrow distribution of polaritons with a characteristic time of 30 ps, which is caused by scattering on acoustic phonons; (3) relaxation through the bottleneck region on a subnanosecond time scale. It is suggested that the polaritons immediately below the resonance frequency are responsible for the observed excitonic energy transfer in anthracene crystals. |
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