Requested by no1uno
Luminescent Properties of Sodium Salicylate Films Prepared by the Sol?Gel Method
Ramaos,G;delMonte,F;Zurro,B;McCarthy,K;Baciero,A;Levy,D
Langmuir
2002,Vol.18(4), pp.984-986
DOI: 10.1021/la011375g
Abstract
The preparation of sodium salicylate doped sol?gel films and their application as phosphor screens have been studied. The sol?gel process opens the possibility of homogeneously tailoring the overall thickness and chemical composition of such films. The adhesion of the sol?gel processed film to the substrate is noteworthy and, together with the rad-hard characteristics of the silica matrix, contributes to the durability of these films. With regard to the characteristics of the sodium salicylate doped sol?gel films as phosphor screens, the measured relative fluorescence efficiency is found to be among the highest ever reported without adverse affects on the fast response time (4 ns).
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A study of a high-pressure thermal argon plasma as a high-radiance standard
Goldbach,Claudine;Nollez,Gerard;Peyturaux,Roger
J. Quant. Spect. & Rad. Tran.
1972, Vol.12(7), pp.1089-1104
DOI: 10.1016/0022-4073(72)90012-X
Abstract
This work represents a first step in the realization of a plasma source emitting blackbody radiation. A theoretical evaluation of the conditions to be fulfilled in order to obtain strictly planckian radiation from a pure argon plasma has been made. The plasma generator is a wall-stabilized arc 49 mm in length, burning stably under pressure as high as 50 atm. Spectroscopic diagnostics of the plasma have been performed by using various methods and using the hypothesis that L.T.E. obtains. For a constant value of the electrical intensity (150 A), the electronic temperature decreases from about 14,000°K at atmospheric pressure to about 11,500°K at 50 atm. The continuous radiation has been measured between 1 and 50 atm; the values of the monochromatic brightness temperature were deduced from it and compared with the value of the electronic temperature. For the maximum values of pressure, length, and temperature, the emitted radiation is not Planckian but the brightness temperature TL of the continuum remains constant in a wide spectral range (3500 less-than-or-equals, slant ?[A] less-than-or-equals, slant 6500). In addition, discrepancies also appear between the theoretical forecasts and the experimental values. However, the arc which has been realized can constitute a useful reference source of high radiance in the visible and near u.v. range, because of its time stability and of the reproducibility of the emitted light intensities.
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Excitation of the fluorescence of tungstates in the region of the fundamental absorption using synchrotron radiation
Gurvich,A;Meleshkin,B;Mikhailin,V Khundzhua,A
J. App. Spec.
2002, Vol.20(4), pp.488-490
DOI: 10.1007/BF00941439
Abstract
Fluorescent tungstates of metals of group II of the periodic system, used, in particular, as x-ray luminophors, belong to the class of self-activated crystallophosphors based on salts of oxygen containing acids, which, as a rule, are derivatives of d-transition metals - tungsten, molybdenum, niobium, tantalum, zirconium. It is suggested that the centers of fluorescence are anionic complexes, formed by these elements.
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Synthesis, characterisation and photoluminescence of nanocrystalline calcium tungstate
Phuruangrat,Anukorn,Thongtem,Titipun,Thongtem,Somchai
J. Exp. Nano Sci.
2010, Vol.5(3), pp.263-270
DOI: 10.1080/17458080903513276
Abstract
Calcium tungstate nanocrystalline was successfully synthesised via a microwave irradiation method using Ca(NO3)2 and Na2WO4 in ethylene glycol, without the requirement of any calcination. The product was analysed by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and photoluminescence spectrometry. XRD, SAED and TEM revealed that the product was body-centred tetragonal CaWO4 with an average particle size of 12 nm. Different oscillation modes were detected by Raman spectroscopy and FTIR. They showed the strong W-O stretching in [WO4]2- tetrahedrons at 711-933 cm-1. Photoluminescence (PL) of CaWO4 nanocrystalline showed the maximum emission peak at 422 nm.
NB These are important if we are going to work out a decent source of UV Radiation, Calcium tungstate fluoresces, emitting a continuum source from 200-500nm when excited with either X-rays or Extreme UV, as Argon Excimer lamps emit over 50nm - ~100-150nm, they may well be sufficient to excite these simple phosphors. If they do that, then a simple dielectric microdischarge, or an array thereof, using fuck all power (high kV/low mA) and two diodes (warm white & blue white) we will have a continuum spectrum all the way to ~800, then we only need to look at the FWHM of the NIR Diodes in order to get the simplest, most cost effective and longest lasting light source possible. It may even be possible to coat the cover of the housing with a couple of phosphors (like the one on white-blue leds), to give us a good visible range as well as the UV-A/B/C, in one tiny package. That will reduce the power consumption of a spectrometer, simplify the shit out of the lighting and make the whole thing seriously cheaper (UV Lights are fucking expensive)