1989/05/15 by Tetsuhiko Tomiki, Fujito Fukudome, Minoru Kaminao +3 · 33 citations
Materials Science · Physics and Astronomy · #Atomic physics #Condensed matter physics #Emission spectrum #Excitation #Exciton #Ion #Luminescence Properties of Advanced Materials #Materials science #Molecular physics #Nuclear Physics and Applications #Optics #Optoelectronics #Phosphor #Photon #Photon energy #Physics #Radiation Detection and Scintillator Technologies #Spectral line #Ultraviolet #Vacuum ultraviolet
paper · doi:10.1143/jpsj.58.1801
published in Journal of the Physical Society of Japan 58(5), 1801-1810 (Physical Society of Japan)
openalex publication_date 1989/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Optical absorptions in the tail region and the reflectivity at room temperature in the VUV region up to ∼40 eV are measured for YAG single crystals. Various optical constants are derived therefrom as functions of photon energy by means of the Kramers-Kronig relation. The Urbach rule parameters are determined experimentally for the tails intrinsic to YAG single crystals. The exciton peak is inferred to lie near the photon energy of the convergence point (7.012 eV) of the Urbach tails, taking into account the peak position (∼7.0 eV) of the excitation spectrum of Ce 3+ -emission from YAG:Ce 3+ phosphors. A tentative interpretation of the spectral features found in the spectra of optical constants in terms of the energy levels of the constituent free ions is given.