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Optical and ESR studies of persistent phosphor Ce3+-doped CaYAl3O7
Mitsuo Yamaga 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.S1
Fluorescence from CaYAl3O7 (CYAM) melilite crystal doped with Ce3+ excited at 266 or 355 nm has a broad band with a peak at 430 nm. The decay time of the Ce3+ fluorescence is 45 ns below 300 K. Persistent phosphorescence, of which the line shape is the same as that of the Ce3+ fluorescence, has fairly long decay times distributed in the range from 1 to 1000 s. After irradiating CYAM:Ce with the UV light at 300 K, ESR spectra measured at 77 K consist of a single resonance line with a g value of 2.002 and two sets of the sextet-hyperfine lines with a g value of 2.012 due to the hyperfine coupling with Al nuclear spin (I = 5/2). The g values of these ESR lines indicate that an electron is trapped at an oxygen vacancy and a hole is selftrapped around a single Al3+ ion. We have proposed a mechanism responsible for the persistent phosphorescence in CYAM:Ce, taking into account the crystal structure and the ESR results.
Dynamics processes between Sm2+, Sm3+ and color centers in KY3F10 : Sm crystals
Mitsuo Yamaga,Shin-ichiro Tsuda,Jon-Paul R. Wells,Thomas P. J. Han 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.3
Three distinct Sm2+ impurity centers, a single Sm3+ impurity center, and a color center were identified in KY3F10 with 1 mol.% of Sm ion dopant by their emission and excitation spectra in the vacuum ultraviolet (VUV), ultraviolet (UV), and visible regions. The excited states of the Sm2+ centers consisted of the lower 5 DJ (J = 0,1,2,3) multiplets and the higher lying 4f5 5d excited states. VUV or UV excitation directly into the 4f6 → 4f5 5d transitions of Sm2+ produced cascade emission from the metastable 5 DJ (J = 3,2,1,0) multiplets to the lowest 7 FJ (J = 0,1,2,3,4) multiplets at low temperatures. Energy transfer from Sm2+ to Sm3+ ions was observed in the excitation spectra of the Sm3+ emission. Excitation at 532 nm for a sample temperature of 300 K produced a broad emission band with a peak at 660 nm and sharp emission lines at 680, 692 and 738 nm, being due to Sm2+. 532 nm irradiation for 30 minutes decreased the intensity of the broadband to one-quarter of the initial intensity and increased slightly the intensities of the sharp lines.
Tenoscopy for Acute Septic Digital Flexor Tenosynovitis Treatment in 13 Thoroughbred Horses
서종필,Fumiki kato,Tsukasa Suzuki,Takashi Yamaga,Masaaki Tagami 한국임상수의학회 2016 한국임상수의학회지 Vol.33 No.1
Septic tenosynovitis of the digital flexor tendon sheath (DFTS) is a potentially career-ending and lifethreatening problem in horses. This study aimed to describe the outcomes of tenoscopy for the treatment of acute septic digital flexor tenosynovitis in horses. Tenoscopy was performed on 13 Thoroughbred horses with acute septic tenosynovitis of the DFTS. Surgical time was 56-148 min (mean 85.6 min, median 84.0 min). In the synovial fluid analysis, mean white blood cell count, mean neutrophil proportion, and mean total protein were 42.9 × 103 cells/μl (range, 7.2-109.5 cells/μl), 89.5% (range, 68-97%), and 4.0 g/dl (range, 2.5-5.2 g/dl), respectively. Microbial growth in the synovial fluid culture was detected in 2 of 11 horses. All horses survived and returned to their intended use without complications. The present study demonstrated that the tenoscopy is useful for treating acute septic tenosynovitis of the DFTS in horses.