Journals →  Tsvetnye Metally →  2015 →  #10 →  Back

RARE METALS, SEMICONDUCTORS
ArticleName The fine-crystalline luminophore Gd2O2S:Tb for image converter tube screens
DOI 10.17580/tsm.2015.10.13
ArticleAuthor Boev E. I., Glagoleva M. A.
ArticleAuthorData

LLC “Lyumpeks”, Pereslavl-Zalessky, Russia:

E. I. Boev, Technical Director, e-mail: ei.boev@yandex.ru

 

National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Moscow, Russia:
M. A. Glagoleva, Assistant Professor, e-mail: mag905@yandex.ru

Abstract

For the purpose of quality improvement and increasing of yield enhancement of image converter tubes, there was developed the synthesis technology of luminophore Gd2O2S:Tb (KFL-544 (КФЛ-544)) with average crystal size of 0.6–0.8 μm, and its output was organized for replacement of both luminophore KS-525 (КС-525) (ZnS:Cu, Al) (insufficiently stable with the temperature of 400 °С) and luminophore R-43 (Р-43) (Gd2O2S:Tb) (currently imported). In comparison with ZnS, the higher thermal resistance of Gd2O2S allows to increase the heat treatment temperature of screens with luminophore in vacuum to the range of 450–500 °С, which increases the yield enhancement of image converter tube screens. Tests of screens with luminophore KFL-544 and R-43 have shown that the screens with luminophore KFL-544 with close chromaticity coordinates are brighter than the screens with luminophore R-43. At the same time, luminophore KFL-544 allows to obtain a high-quality uniform coating without defects. Image converter tubes EPM 215G-00-11 (ЭПМ 215Г-00-11) with luminophores KFL-544 and R-43 were manufactured. Measurement results have shown that the light output of the screens with luminophores R-43 and KFL-544 is 3.5–4 and 6–6.5 cd/W; resolving limit of image converter tubes is 63.2–66.6 and 66.6–70.1 str/mm; resolving limit of screen centre is 150–180 and 170–190 str/mm respectively. There was offered the luminescent method of qualitative assessment of Eu impurity content in the Gd2O3 batch, meant for the Gd2O2S:Tb synthesis by comparison of self-activated zone and Eu zone intensities in the researched batch and check sample. Positive results with Gd2O2S:Tb synthesis may be obtained with use of Gd2O3 batches in case if Eu zone intensity is not more than 20% of self-activated zone intensity which should be not more than 80% in comparison with check sample.

keywords Synthesis, gadolinium oxysulphide, fine-crystalline luminophore, heat resistivity, image converter tube, luminous efficiency, resolving capacity, luminescent method
References

1. Kuklev S. V., Sokolov D. S., Zaydel I. N. Elektronno-opticheskie preobrazovateli (Image converter tubes). Moscow : Mashinostroenie, 2004. pp. 51–61.
2. TU 6-09-31-356–91. Lyuminofory KS-525-1 i KS-525-2 (Technical requirements 6-09-31-356-91. Luminophores KS-525-1 (КС-525-1) and KS-525-2 (КС-525-2)). Introduced : Janiary 01, 1992. (in Russian).
3. Royce M. R., Thomsen S. M., Yocom P. N. Process for preparing phosphor. Patent US, No. 3502590. Filed : 01.03.1967. Published : 24.03.1970.
4. Boev E. I., Glagoleva A. A., Triposhina N. A. Lyuminofory na osnove oksisulfidov redkozemelnykh elementov (Lumiophores based on rare-earth element oxisulphides). Proizvodstvo redkikh metallov i poluprovodnikovykh materialov : obzornaya informatsiya (Manufacturing of rare metals and semiconductor materials : review information). Moscow : TsNIItsvetmet ekonomiki i informatsii, 1992. Iss. 1.
5. Boev E. I., Kamarzin A. A., Yarembash E. I. et al. Sposob polucheniya svetosostava (Phosphor obtaining method). Certificate of Authority USSR, No. 434776. Applied : November 20, 1970. Published : March 07, 1974.
6. Mattis J. J., Tecotzky M. Silicon sensitized rare earth oxysulfide phosphors. Patent US, No. 3904546. Filed: 27.08.1973. Published : 09.09.1975.
7. Yamada H., Suzuki A., Yamamoto H., Kano T., Manabe T. Phosphor and process for preparation thereof. Patent GB, No. 2037800. Filed : 05.11.1979. Published : 16.08.1980.
8. Kanehisa O., Kano T., Nakano M., Yamamoto A., Yamada H., Manabe T., Matsubara H. Fluorescent substance synthesis method. Patent JPS, No. 60-59945. Filed : 21.09.1977. Published : 27.12.1985.
9. Nath D. K. Preparation of rare earth oxysulfide phosphors. Patent US, No. 3878119. Filed : 26.12.1972. Published : 15.04.1975.
10. Yamada H., Miura I., Doi M., Miyazaki O., Yoshida M. Phosphor and radiation detector and X-ray CT unit each equipped therewith. Patent US, No. 6340436. Filed : 08.08.1998. Published : 22.01.2002.
11. Yamada H. et al. A scintillator Gd2O2S:Pr, Ce, F for X-ray computed tomography. Journal of The Electrochemical Society. 1989. Vol. 136, No. 9. pp. 2713–2716.
12. Xing M. M., Cao W., Pang T. et al. Preparation and characterization of monodisperse spherical particles of X-ray nano-phosphors based on Gd2O2S:Tb. Chinese Science Bulletin. 2009. Vol. 54, No. 17. pp. 2982–2986.
13. Song Y., You H., Huang Y. et al. Highly uniform and monodisperse Gd2O2S:Ln + 3 (Ln = Eu, Tb) submicrospheres: solvothermal synthesis and luminescence properties. Inorganic Chemistry. 2010. Vol. 49, No. 24. pp. 11499–11504.
14. De Crom N., Devillers M. A new continuous two-step molecular precursor route to rare-earth oxysulfides Ln2O2S. Journal of Solid State Chemistry. 2012. Vol. 191. pp. 95–200.
15. Yang L., Wang J., Dong X. et al. Advancements in synthesis methods of micro- and nano-rare earth oxysulfides. Zhonggua Xitu Xuabao. 2011. Vol. 29, No. 6. pp. 643–654.
16. Hernández-Adame L., Medellín-Rodríguez F., Méndez-Blas A., Vega-Acosta R., Palestino G. Synthesis of Gd2O2S:Tb nanoparticles and optical characterization. Proceedings of SPIE — The international Society for Optical Engineering. 2013. Vol. 8626.
17. Gugel B. M. Lyuminofory dlya elektrovakuumnoy promyshlennosti (Luminophores for electrovacuum industry). Moscow : Energiya, 1967. 122 p.
18. Manashirov O. Ya., Novikova G. N., Panchenko A. I. et al. Termicheskaya ustoychivost oksisulfidov ittriya, gadoliniya i lyuminofory na ikh osnove (Heat resistivity of oxisulphides of yttrium, gadolinium and luminophores on their basis). Sbornik nauchnykh trudov Vsesoyuznogo Nauchno-Issledovatelskogo Instituta lyuminoforov. Seriya “Lyuminestsentnye materialy i osobo chistye veshchestva”. Vypusk 5 (Collection of scientific proceedings of All-Union Scientific-Research Institute of luminophores. Series “Luminescence materials and highly purified substances”. Issue 5). Stavropol, 1971. 42 p.

Language of full-text russian
Full content Buy
Back