Low-temperature time-resolved vacuum UV spectroscopy of NH4H2PO4 crystals |
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| Authors: | I. N. Ogorodnikov V. A. Pustovarov M. Kirm V. S. Cheremnykh |
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| Affiliation: | 1.Ural State Technical University,Yekaterinburg,Russia;2.Institut für Experimentalphysik der Universit?t Hamburg,Hamburg,Germany |
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| Abstract: | A complex investigation of the dynamics of electronic excitations in nonlinear optical crystals of ammonium dihydrophosphate NH4H2PO4 was performed using low-temperature vacuum UV luminescence spectroscopy with time resolution upon selective photoexcitation by synchrotron radiation. Data on the photoluminescence decay kinetics, time-resolved photoluminescence spectra (2–6.2 eV), and time-resolved photoluminescence excitation spectra (4–24 eV) were obtained for the first time for NH4H2PO4 crystals at 8 K. It is ascertained that the photoluminescence of NH4H2PO4 crystals in the vicinity of 4.7 eV has intrinsic character due to the radiative annihilation of self-trapped excitons. Possible channels of generation and decay of relaxed and unrelaxed electronic excitations in NH4H2PO4 crystals are discussed. |
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