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Improvement in Electro-Optical Characteristics of CaS:Eu Electroluminescent Devices

  • M. Ando
  • Y. A. Ono
  • K. Onisawa
  • H. Kawakami
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 38)

Abstract

Electro-optical characteristics of rare-earth doped alkaline-earth-sulfide electroluminescent(EL) devices were studied. Measurement of luminance and transferred charge responses in CaS:Eu. CaS:Ce, SrS:Eu, and SrS:Ce EL devices revealed that rare-earth luminescent centers played a decisive role in controlling electro-optical characteristics. Especially, Eu was found to be the cause of the slow electro-optical response and a sharp decrease of luminance and transferred charge with a decrease of frequency in CaS:Eu. These characteristics were improved by co-doping a small amount of Ce to CaS:Eu. Especially, by doping 0.05mol% Ce to CaS:Eu(0.2mol%), the transferred charge response time decreased one-and-a-half orders of magnitudes and became almost the same as that of ZnS:Mn.

Keywords

Voltage Dependence Luminescent Center Phosphor Layer Half Order Threshold Electric Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • M. Ando
    • 1
  • Y. A. Ono
    • 1
  • K. Onisawa
    • 1
  • H. Kawakami
    • 2
  1. 1.Hitachi Research LaboratoryHitachi Ltd.Hitachi-shi, Ibaraki-kenJapan
  2. 2.Mobara WorksHitachi Ltd.Mobara-shi, Chiba-ken 297Japan

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