Spectroscopic properties of cerium-doped aluminosilicate glasses

Abstract

The spectroscopic properties of cerium ions in various aluminosilicate glasses modified by Mg 2+ , Ca 2+ , Ba 2+ and Na + were investigated in order to optimize these for the potential utilization as Ce 3+ /Yb 3+ quantum cutting material. An increasing optical basicity of the glasses results in a shift in the peak position of the 5d-4f emission of Ce 3+ to longer wavelengths and in a decrease in the Ce 3+ fluorescence intensity due to decreasing Ce 3+ /Ce 4+ ratios. Argon-bubbling of the melt and supplying argon as melting atmosphere and/or using small amounts of metallic aluminum powder as raw material led to an almost complete reduction of Ce 4+ to Ce 3+ . This resulted in much higher intensities of the Ce 3+ fluorescence emission which runs parallel to a decreasing charge transfer absorption of Ce 4+ . From the absorption spectra of these samples extinction coefficients for Ce 4+ and Ce 3+ were calculated. For this purpose, an additional sample was prepared by using oxygen bubbling of the melt. An increasing cerium concentration shifts the Ce 3+ emission peak position to longer wavelengths, while up to 2·10 20 ions per cm 3 only a slight increase in the Ce 3+ emission intensity was observed. At higher dopant concentrations, a drastic decrease in the Ce 3+ fluorescence emission is observed which is most likely attributed to an increasing Ce 4+ concentration. High intensity Ce 3+ blue emission matching the spectroscopic requirements for potential quantum cutting in Ce 3+ /Yb 3+ codoped glasses could be achieved with a barium aluminosilicate glass.

Highly transparent cerium doped glasses with full‐band UV‐shielding capacity

“…The emission spectra ( λ ex = 367 nm) of G1‐4 samples are presented in Figure B. The blue broad emission centered at around 444 nm is attributed to the 5 d → 4 f allowed transition of Ce 3+ . The emission band of G4 can be deconvoluted into two Gaussian profiles centered at 440 and 490 nm with an energy difference of 2124 cm −1 , which is close to the theoretical difference between the 2 F 5/2 and 2 F 7/2 levels of Ce 3+ (~2000 cm −1 ) …”

“…A higher optical basicity of the glasses results in red-shift in the peak position of excitation and emission of Ce 3+ and a decrease in the Ce 3+ fluorescence intensity due to decreasing Ce 3+ /Ce 4+ ratios. 20,37 The luminescence of Ce 3+ will be suppressed and the absorption of Ce 3+ will be closer to the UVA range. The full-band UV-blocking capability, high transmittance in visible light region, and long-term stability are investigated in detail.…”

Optical and dosimeter properties of Li₂O–Al₂O₃–B₂O₃ based glasses

“…In addition, the color of asprepared glasses becomes yellowish gradually with the increasing concentration of Ce-dopant, which may be caused by Ce 4+ ions. 23) The XRD patterns of the as-prepared glasses are shown in Fig. 2.…”

Dust Detection via Voltage Power Spectroscopy on a CubeSat in Earth's Ionosphere

“…The MLI used for the empirical results in Collette et al (2014) had a top layer of indium tin-oxide-coated Teflon, which we estimate to have a density of MLI = 2,320 kg/m 3 . The solar panels tested by Collette et al (2014) had a cerium-doped glass top surface 150 μm thick, for which we estimate Solar = 3,000 kg/m 3 based on the typical ranges of cerium-doped glass (2,550-3,729 kg/m 3 ; Herrmann et al, 2015). Lastly, BeCu alloys are copper based and contain 0.5-3% beryllium; therefore assuming a 2% alloy we estimate BeCu = 8,820 kg/m 3 .…”