New studies of non-photochemical holes of dyes and rare-earth ions in polymers. II. Laser-induced hole filling |
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| Affiliation: | 1. School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China;2. CQM-Centro de Quimica da Madeira, Universidade da Madeira, Campus da Penteada, 9000390 Funchal, Madeira, Portugal;3. Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China;4. College of Food and Drug, Luoyang Normal University, Henan, Luoyang 471934, PR China;1. Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China;2. Institute of Agricultural Quality Standards and Testing Technology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China;1. Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering, Ministry of Industry and Information Technology, Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photo-electronic/Electrophotonic Conversion Materials, Analytical and Testing Center, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, PR China;2. School of Medical Technology, Beijing Institute of Technology, Beijing, 100081, PR China;1. College of Science, Nanjing Forestry University, Nanjing, 210037, China;2. College of Forestry, Nanjing Forestry University, Nanjing, 210037, China;3. Institute of Material Physics & Chemistry, Nanjing Forestry University, Nanjing, 210037, China;4. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China |
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| Abstract: | The phenomenon of laser-induced hole filling (LIHF) is reported and discussed in detail for rhodamine 640, Nd3+, Pr3+ and the mixed system of rhodamine 560 and cresyl violet. Importantly, LIHF does not show any spectral diffusion (i.e. broadening). Possible mechanisms (thermal heating, site reversion and energy transfer) involved in LIHF are discussed and are argued to have insignificant contribution. A tentative model is developed to explain these results. The model basically invokes a connectivity between spatially removed extrinsic (impurity) two-level systems (TLS) via an ensemble of intrinsic (host) TLS (the glassy state). Additionally, a correlation between impurity excitation energies and absolute glassy state energies is imposed. |
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