2가 유로피움으로 활성화된 NaCaPO4의 합성과 광 특성

김동진; 박인용; 이종원; 김규진; 김병규; Dongjin Kim; In Yong Park; Jongwon Lee; Kyu-Jin Kim; Byoung-gyu Kim

Korean Journal of Materials Research, Vol.16, No.10, 624-628, October, 2006

DOI10.3740/MRSK.2006.16.10.624 Export Citation

2가 유로피움으로 활성화된 NaCaPO4의 합성과 광 특성

Preparation and Photoluminescent Properties of NaCaPO4 Activated by Divalent Europium

김동진, 박인용^{1, †}, 이종원, 김규진¹, 김병규²

한밭대학교 재료공학과
¹휴먼일렉스(주)
²한국지질자원연구원

Dongjin Kim, In Yong Park^{1, †}, Jongwon Lee, Kyu-Jin Kim¹, and Byoung-gyu Kim²

Department of Materials Engineering, Hanbat National University, Daejeon 305-719, Korea
¹Humanelecs CO., LTd., Moonpung-dong, Daedeok-Gu, Daejeon 306-220, Korea
²KIGAM, 30 Kajung-dong, Yusung-ku, Daejeon 305-350, Korea

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In this study, divalent europium-activated green phosphor powders were prepared by the chemical synthetic method followed by heat treatment in reduced atmosphere, and the crystal structures, morphologies and photoluminescent properties of the powders were investigated by x-ray powder diffraction, scanning electron microscope and spectrometer for the first time. The effects of Ca/P and Na/Ca mole ratios on the final products were also investigated. The influences of input amount change of europium as the activator on the light emission intensity were studied, and the resulting concentration quenching phenomenon was observed. The optimized synthesis conditions obtained in this study were Ca/P mole ratio 1.2, Na/Ca mole ratio 3.0 and 4 mole%Eu. The peak wavelength was 505 nm for all the samples. The result of excitation spectrum measurement indicated that the excitation efficiency was high for the long-wavelength UV region. It was thus concluded that the samples prepared in this study can be successfully applied for the light-emitting devices such as LED excited with long-wavelength UV light sources.

Keywords:NaCaPO4 : Eu2+ Phosphor;Photoluminescence;Concentration Quenching

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[1] Palilla FC, O'Reilly BE, J. Electrochem. Soc., 115(10), 1076 (1968)

[2] Sohn JR, Kang YC, Park HD, Yoon SG, Korean J. Mater. Res., 12(7), 555 (2002)

[3] Kamiya S, Mizuno H, Phospbor Handbook, ed. by Shionoya S, Yen WM, CRC Press, Boca Raton, 1999, Ch. 5, p. 391 (1999)

[4] Lee JH, Kang YC, Park SB, Park HD, Jpn. J. Appl. Phys., Pt. 1, 40(5A), 3222 (2001)

[5] Wen FS, Zhao X, Ding H, Huo H, Chen JS, J. Mater. Chem., 12, 3761 (2002)

[6] Bril A, Klasen HA, Philips Res. Rept., 7, 421 (1952)

[7] Bril A, Klasen HA, Zalm P, Philips Res. Rept., 8, 393 (1953)

[8] Wanmaker WL, Spier HL, J. Electrochem. Soc.: Solid-State Sci. Eng., 109, 109 (1962)

[9] Waite MS, J. Electrochem. Soc.: Solid-State Sci. Eng., 121(8), 1122 (1974)

[10] Ben Amara M, Parent C, Vlasse M, Le Flem G, J. Less Common Vetals, 93, 425 (1983)

[11] Pierron L, Kahn-Harari A, Viana B, Dorenbos P, Van Eijkn CWE, J. Phys. Chem. Solids, 64(9-10), 1743 (2003)

[12] Roth RS, Dennis JR, McMurdic HF, Phase Diagrams for Ceramists, Ed. by Smith G, Columbus, 1981, vol. IV, p.175 (Fig. 5324) (1981)

[13] JCPDS Card No. 29-1193

[14] JCPDS Card No. 03-0751

[15] Berger G, Gildenhaar R, Ploska U, Biomater, 16(16), 1241 (1995)

[16] Jinlong N, Zhenxi Z, Dazong J, Mater. Chem. Phys., 78(2), 308 (2003)

[17] Ryu H, Park JK, Park HD, J. Kor. Ceram. Soc, 35(8), 801 (1998)

[18] Nakazawa E, Phosphor Handbook, ed. by Shionoya S, Yen WM, CRC Press, Boca Raton, 1999, Ch. 2, pp. 108-109 (1999)

[19] Kottaisamy M, Jagannathan R, Jeyagopal P, Rao RP, Narayanan R, J. Phys. D: Appl. Phys., 27(10), 2210 (1994)

[20] Zhou Y, Shu R, Zhang X, Shi J, Han Z, Mater. Sci. Eng. B, 68(1), 48 (1999)

[21] Jagannathan R, Rao RP, Narayanan RL, Srinivasan LK, Solid State Commun., 74(8), 825 (1990)