Tanabe, Setsuhisa?Hanada, Teiichi?Watanabe, Masayuki?Hayashi, Tetsusuke?Soga, Naohiro
Dysprosium-doped glasses were prepared in the system of gallium-based sulfide, tellurite, zirconium-based and indium-based fluorides and their optical properties were studied. From the absorption cross sections of five f-f bands, three Judd-Ofelt parameters, Omega //t (t equals 2, 4, 6), of Dy**3** plus ion were determined. (more…)
Hiroki Fujimori, Hiroaki Fujita, and Masaharu Oguni*
The irreversible enthalpy-relaxation processes of a liquid were tracked by the temperature jump method, and simulated based on a double-well potential model. The processes were found to show remarkable nonexponentialities and a nonlinearity to the temperature jump. The nonlinearity (? ) was interpreted to originate primarily from the fragility (m ), namely the non-Arrhenius property of the relaxation times.
Tsuneo Fujii,* Yuichiro Hisakawa, Edmund J. Winder
The photoluminescence (PL) of CdS quantum dots prepared by the sol-gel method was investigated. The intensity ratio of the green PL to that of the red PL for a 600 °C-treated sample shows a reversible behavior against exposure to SO2 . (more…)
Glasses patent claims:
I claim:
1. A batch for a heat absorbing glass exhibiting very good transmittance in the visible portion of the radiation spectrum and having a strain point higher than 560.degree.C. consisting essentially, by weight on the oxide basis, of about 0.5-3% FeO, 0.5-3% R.sub.2 O, wherein R.sub.2 O consists of Li.sub.2 O, Na.sub.2 O, and/or K.sub.2 O, 12-16% Al.sub.2 O.sub.3, 10-30% SiO.sub.2, and 50-65% P.sub.2 O.sub.5, wherein NH.sub.4 H.sub.2 PO.sub.4 is utilized as a batch ingredient in an amount sufficient to provide about 1-9% P.sub.2 O.sub.5. (more…)
The purpose of this work is to clarify the relationship between some of the properties of MOS capacitors passivated by fluoride-containing zinc borosilicate glasses and the hydroxyl content of the glasses. Substitution of ZnF2 for ZnO progressively decreases the OH^- absorption coefficient and the C-V curve shift, ?(?-)VGVG” height=”17″ width=”29″> , in the MOS capacitors decreased. A good recovery without hysteresis was observed in the MOS capacitors passivated by glasses with a small concentration of OH^-ions. (more…)
The effect of a Na2O network modifier on the persistent spectral hole burning of Pr^3+ ions has been investigated in (GeO2)1 - x-(Na2O)x glasses for x=0-0.35. The homogeneous linewidth increased twice by adding 35 mol% Na2O. The hole burning efficiency was found to increase about 8 times by adding the same amount of Na2O. These observations are interpreted by considering coupling of the optical centers with the TLS introduced by Na2O doping. (more…)