NDLI: Powder Reflection Spectroscopy in the Vacuum uv range

Content Provider	Springer Nature Link
Author	Enseling, D. Herden, B. Katelnikovas, A. Möller, S. Winkler, H. Petry, R. Meyer, H. J. Jüstela, T.
Copyright Year	2014
Abstract	The measurement of diffuse refl ectance spectra below 230 nm for ceramic luminescent materials is usually not performed although it is of tremendous interest, e.g., to determine their quantum effi ciency upon VUV excitation. In contrast, the recording of VUV excitation spectra is well established, e.g., to evaluate VUV phosphors. The lack of access to diffuse powder refl ection spectra in this range is caused by the absorption edge (optical band gap) of the most common refl ectance standards; for instance, BaSO$_{4}$ or CaCO$_{3}$–VUV photons with energies higher than the absorption edge are not refl ected but absorbed and thus not amenable to detection in a synchronous scan. The measurement technique presented in this paper allows monitoring refl ection properties of powder samples in the range from 120 to 300 nm (10.3 to 4.1 eV). To this end, all VUV photons refl ected by the sample are converted into visible photons, which are collected in an Ulbricht sphere and fi nally counted by a photomultiplier tube (PMT). This requires a custom-built integrating sphere, viz. one that is coated with a (V)UV to Vis converter, e.g., a phosphor such as BaMgAl$_{10}$O$_{17}$:Eu$^{2+}$ (BAM:Eu) showing a spectrally independent and high light output in the respective wavelength range. This paper sketches the technique and procedure for recording VUV refl ection spectra and shows the results for several standard phosphors. It also reveals the limits of this new technique.
Starting Page	341
Ending Page	346
Page Count	6
File Format	PDF
ISSN	00219037
Journal	Journal of Applied Spectroscopy
Volume Number	81
Issue Number	2
e-ISSN	15738647
Language	English
Publisher	Springer US
Publisher Date	2014-05-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	vacuum ultraviolet spectroscopy refl ection spectroscopy garnet luminescent material Atomic/Molecular Structure and Spectra Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Condensed Matter Physics

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