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Cooperative emission of photons by weakly coupled chromium ions in YAG and LaAlO3 |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, China;2. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China;1. Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, CA 93106, USA;2. Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA;3. Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, USA;4. Mitsubishi Chemical Group Science and Technology Research Center, Yokohama, Kanagawa 227-8502, Japan;5. Materials Department, University of California, Santa Barbara, CA 93106, USA |
| Abstract: | In YAG:Cr3+ and LaAlO3:Cr3+ we have found cooperative emissions of one photon by two excited Cr3+ ions analogous to those recently observed by us in Al2O3:Cr3+. The vibronic sideband of this fluorescence confirms our earlier identification of the photons involved with the polar longitudinal optical modes of the host lattice. Fluorescence decay measurements again indicate radiationless decay processes of the doubly excited pair states leading to non-equilibrium R2 emission. A fluorescence 2A1→4A2 of chromium ions in YAG has been detected for the first time. |
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