Kaplyanskii et al., The Spectra of Divalent Rare Earth Ions in Crystals of Alkaline Earth Fluorides (II Europium and Ytterbium), Optics and Spectra 13, (1962), pp. 129-132. |
Blasse et al., Investigation of Some Ce.sup.3+ -Activated Phosphors, J. Chem. Phys. 47 (1967), pp. 5139-5145. |
Weber, Nonradiation Decay from 5d States of Rare Earth in Crystals Solid State Communications 12 (1973), pp. 741-744. |
Elias et al., Excitation of U.V. Fluorescence in LaF.sub.3 Doped with Trivalent Cerium and Praseodymium, Phys. Rev. B 8 (1973), pp. 4989-4995. |
Pisarenko et al., Luminescence of Ce.sup.3+ in NaF at Low Temperatures, Part 1, Optics and Spectroscopy 38 (1975), pp. 51-53. |
Pisarenko et al., Luminescence of Ce.sup.3+ in NaF at Low Temperatures, Part 2, Optics and Spectroscopy 39 (1975), pp. 522-524. |
Yang et al., VUV Fluorescence of Nd.sup.3+, Er.sup.3+, and Tm.sup.3+ -Doped Trifluorides and _Tunable Coherent Sources from 1650 to 2600 A.degree.., Appl. Phys. Lett. 29 (1976), pp. 499-501. |
Abbruscato, Optical and Electrical Properties of SrAl.sub.2 O.sub.4 : Eu.sup.2+., J. of Electrochemical Society 118 (1971), pp. 930-933. |