Photoemission spectroscopy using synchrotron radiation was used to determine the energy level structure of Mn doped Li2B4O7 crystals. Photoemission studies provided evidence of Mn in the bulk crystal at 47.2 eV. Valence band analysis provided the presence of surface states but no acceptor sites. Cathodoluminescence studies were also made on undoped and Mn doped Li2B4O7 using various beam energies from 5 to 10 KeV at room temperature. Self trapped exciton emission states are evident in the undoped and Mn doped Li2B4O7 sample ranging in energies from 3.1 to 4.1 eV.
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Dugan, C.L., Hengehold, R.L., McHale, S.R. et al. Photoemission and Cathodoluminescence of Doped Lithium Tetraborate Crystals Being Developed for Neutron Detection. MRS Online Proceedings Library 1341, 710 (2011). https://doi.org/10.1557/opl.2011.1109