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Internal pressure effect on cathodoluminescence enhancement of ZnS:Mn2+ synthesized by a sealed vessel

Published online by Cambridge University Press:  31 January 2011

B.J. Park ,
W.B. Im ,
W.J. Chung ,
H.S. Seo ,
J.T. Ahn  and
D.Y. Jeon
B.J. Park
Affiliation:
Information Technology (IT) Convergence & Components Laboratory, Electronics and Telecommunications Research Institute, Yuseong, Daejeon 305-600, Republic of Korea; and Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, Republic of Korea
W.B. Im
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, Republic of Korea
W.J. Chung
Affiliation:
Department of Advance Materials Engineering, Kongju National University, Kongju-city, Chungnam 314-701, Republic of Korea
H.S. Seo
Affiliation:
IT Convergence & Components Laboratory, Electronics and Telecommunications Research Institute, Yuseong, Daejeon 305-600, Republic of Korea
J.T. Ahn
Affiliation:
IT Convergence & Components Laboratory, Electronics and Telecommunications Research Institute, Yuseong, Daejeon 305-600, Republic of Korea
D.Y. Jeon*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 305-701, Republic of Korea
*
a)Address all correspondence to this author. e-mail: dyj@kaist.ac.kr
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Abstract

ZnS:Mn2+ phosphors were synthesized by a modified solid-state reaction method. In the synthesis method, a sealed vessel is used, where heat and pressure are simultaneously utilized. The effects of various synthesis conditions such as temperature, Mn concentration, and pressure on the cathodoluminescence (CL) were investigated. Among them, pressure had an effect on CL property as much as others. It was observed that CL intensities of ZnS:Mn2+ phosphors increased with the increase of pressure and the best sample showed higher intensity than that of a commercial one by 180%. X-ray diffraction (XRD) and electron paramagnetic-resonance (EPR) were used to understand the enhancement. No change of XRD patterns was observed but the full width at half-maximum (FWHM) of the most intense cubic (111) peak of ZnS:Mn2+ decreased with the increase of pressure. EPR signal intensity of Mn2+ increased with the increase of pressure. The improved crystallinity and more substitution of Zn2+ with Mn metal were believed to be responsible for the enhancement.

Keywords

LuminescenceElectron spin resonanceMn
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2838 - 2844
Copyright
Copyright © Materials Research Society 2007

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