Luminescence characterisation of alumina substrates using cathodoluminescence microscopy and spectroscopy |
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| Institution: | 1. Luminescence Dating and Dosimetry Laboratory, Department of Archaeology, Durham University, Durham DH1 3LE, UK;2. Department of Physics, Science Laboratories, Durham University, Durham DH1 3LE, UK;1. Nuclear Research Center Negev, Beersheva, Israel;2. Ben Gurion University of the Negev, Beersheva, Israel;3. Soreq Nuclear Research Center, Yavne 81800, Israel;4. Sami Shamoon College of Engineering, Beersheva 84100, Israel;1. Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;2. Tokuyama Corp, 1-1 Mikage-cho, Shunan-shi, Yamaguchi 745-8648, Japan;3. Kyusyu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka 808-0196, Japan;4. Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;1. Laboratório de Qumica do Estado Sólido, Departamento de Qumica Fundamental – CCEN, Universidade Federal de Pernambuco, BR 101 s/n, 50670-901, Recife, PE, Brazil;2. Programa de Pós-graduacão em Ciência de Materiais – PPGMTR, CCEN, Universidade Federal de Pernambuco, BR 101 s/n, 50670-901, Recife, PE, Brazil;1. Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel;2. Redwood Scientific Incorporated, Pacifica, CA 94044-4300, USA;3. Physics Department, McDaniel College, Westminster, MD 21157, USA;1. State Key Laboratory of NBC Protection for Civilian, P.O. Box 1044, Ext. 203, Beijing, 102205, PR China;2. Solid Dosimetric Detector and Method Laboratory, P.O. Box 1044, Ext. 203, Beijing, 102205, PR China |
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| Abstract: | Polycrystalline alumina (Al2O3) substrates, found in many electronic devices and proposed as dosemeters in emergency situations, were invstigated using a scanning electron microscope (SEM) equipped with cathodoluminescence (CL) and elemental analysis probes. The characteristics of the CL spectra, surface morphology, and impurity content of the Al2O3 substrates were examined and compared with those of single crystal dosimetry-grade Al2O3:C. Whereas the CL spectrum, measured from 250 to 800 nm, for the Al2O3:C, contained resolved bands located at ∼340 nm and at ∼410 nm, the spectrum measured with the Al2O3 substrate was significantly broader, extending from ∼250 to ∼450 nm, and also included a narrow band at 695 nm. While it is likely that the accepted model of recombination at F+ (∼340 nm) and F (∼410 nm) in Al2O3:C also applies to the substrate, it is suggested that the presence of impurities within the alumina give rise to additional recombination centres. The 695 nm emission has been assigned to a Cr3+ ion impurity in previous work on alumina and a band indicated at ∼300 nm may be associated with Mg2+ or Ca2+, the presence of which was confirmed by elemental mapping. Comparison of the spatial distribution of CL with the surface morphology and elemental composition of the samples indicates that the components of the emission spectrum can be qualitatively correlated with impurity content and morphological features of the samples. |
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| Keywords: | Aluminium oxide Cathodoluminescence Accident dosimetry |
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