Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Improved White Light Emitting Diode Characteristics by Coating GdAG:Ce Phosphor

  • Joshi, Charusheela (Department of Physics, Shri Ramdeobaba College of Engineering and Management) ;
  • Yadav, Pooja (Department of Physics, Shri Ramdeobaba College of Engineering and Management) ;
  • Moharil, S.V. (Department of Physics, R.T.M. Nagpur University)
  • Received : 2013.12.05
  • Accepted : 2014.02.27
  • Published : 2014.04.25
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Abstract

White LEDs, based on blue LED chips coated with a yellow emitting phosphor (YAG:Ce), have several disadvantages. In this paper, we report the improvement in CRI [Color Rendition Index] using $GdAl_5O_{12}:Ce$ (GdAG:Ce) and related phosphors for blue LEDs. A modified combustion synthesis route using mixed fuel was used for synthesis route. By using this procedure, we formed the desired compounds in a single step. LEDs were then fabricated by coating the blue LED chips (CREE 470 nm, 300 micron) with the GdAG:Ce phosphor dispersed in epoxy resin. The CRI typically between 65~70 for the YAG:Ce based LED was improved to 87 for LEDs fabricated from the Gd(Al,Ga)G phosphors.

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