A time-resolved luminescence spectroscopy study of self-trapped excitons in KH2PO4 crystals |
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| Affiliation: | 1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, Jilin Province, PR China;2. State Key Laboratory of Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, Jilin Province, PR China;3. College of Information and Technology, Jilin Normal University, Siping 136000, Jilin Province, PR China;4. Institute of Translational Medicine, the First Hospital, Jilin University, Changchun 130061, Jilin Province, PR China |
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| Abstract: | A complex investigation of the dynamics of electronic excitations in potassium dihydrophosphate (KDP) crystals is performed by the low-temperature time-resolved vacuum ultraviolet optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP crystals, data on the kinetics of the photoluminescence (PL) decay, time-resolved PL spectra (2–), and time-resolved excitation PL spectra (4–) at were obtained for the first time. The intrinsic character of the PL of KDP in the vicinity of , which is caused by the radiative annihilation of self-trapped excitons (STEs), is ascertained; σ and π bands in the luminescence spectra of the STEs, which are due to singlet and triplet radiative transitions, are resolved; and the shift of the σ band with respect to the π band in the spectra of the STEs is explained. |
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