Oxidation suppression of Cu in alkaline aluminophosphate glass and the effects for radiation-induced luminescence characteristics

Abstract

A glass phosphor is an attractive material for applications in radiation detections because of its high workability and availability with a wide range of chemical compositions. Recently, X-ray-induced luminescence of glasses containing various luminescent activators are actively investigated worldwide. In applications as phosphor, tailoring valence state of activators, which can take multiple valence states in glass, is very important. In this research, we studied effects of glass melting atmosphere on the valence state of copper-activator ion in alkaline aluminophosphate glasses and the radiation-induced luminescence characteristics. Optical absorption and X-ray absorption near edge structure spectra of Cu-doped glasses showed that the glass fused in Ar atmosphere contains higher concentration of Cu+ than those prepared in air. In addition, the presence of Cu+ enhances the photoluminescence (PL) quantum yield and PL kinetic constant. Furthermore, the increase of Cu+ concentration resulted an improvement of the X-ray-induced scintillation and thermally-stimulated luminescence intensity.

Optical and Optically Stimulated Luminescence Properties of Ce-doped CsCl–CaCl2–ZnCl2 Glasses

“…(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31) In our previous studies, we investigated Eu-or Ce-doped 20CsCl-20BaCl 2 -60ZnCl 2 (CBZ) glasses and clarified that Ce-doped samples showed high PL quantum yields (QYs) of 75.7%. (32,33) However, most previous studies on the dosimetric properties of glasses have examined the TSL and OSL properties of oxide glasses, (34)(35)(36)(37)(38) and there have been no studies evaluating the OSL characteristics of ZnCl 2 -based glasses. In this study, we evaluated the OSL properties of Ce-doped 20CsCl-20CaCl 2 -60ZnCl 2 (CCZ) glasses for the first time, and the effects of doping on optical and OSL characteristics were also investigated.…”

Catalytic removal of soot particles over potassium glasses – the effect of doping with aliovalent redox metals

“…58) and/or the 2E g -2T g transition of Cu 2+ localized in a distorted octahedral field. 57 Anyway, the authors in a paper 57 suggested that such a result can be obtained for the glass doped with Cu + ions at low concentration of the coexisting Cu 2+ .…”

“…The strong band centered at around 248 nm can be assigned to the 3d 10 -3d 9 4s 1 transition of Cu + (ref. 57) or to LMCT Cu 2+ ← O 2− . 45,57 The second broad band centered at 806 nm can be attributed to the d-d transition in hydroxylated Cu 2+ (ref.…”

“…57) or to LMCT Cu 2+ ← O 2− . 45,57 The second broad band centered at 806 nm can be attributed to the d-d transition in hydroxylated Cu 2+ (ref. 58) and/or the 2E g -2T g transition of Cu 2+ localized in a distorted octahedral field.…”

Mimicking Stained Glass: A Hands-On Activity for the Preparation and Characterization of Silica Films Colored with Noble Metal Ions and Nanoparticles

“…3 For what concerns copper stained-glass plates (Figure 4c), the Cu(II) spectrum shows a main absorption in the red region (around 650−700 nm), which gives rise to a blue-green color that can be attributed to d−d transitions of Cu 2+ in distorted octahedral field surrounded by oxygens. 36 On the other hand, Cu(I) species mainly absorb in the ultraviolet region, 37 while the bands at 320−370 and 400−440 nm can be attributed to charge transfer bands of O−Cu−O and Cu−O−Cu complexes, 36 thus resulting in a greenish color. No bands in the 565−570 nm region can be appreciated; this is the characteristic region of the plasmon resonance of Cu nanoparticles.…”