• Title/Summary/Keyword: LED (1ight Emitting Diode)

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Luminescence Characteristics of Sr3MgSi2O8:Eu Blue Phosphor for Light Emitting Diodes (LED용 Sr3MgSi2O8:Eu청색 형광체의 발광특성)

  • 최경재;박정규;김경남;김창해;김호건
    • Journal of the Korean Ceramic Society
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    • v.41 no.8
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    • pp.573-577
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    • 2004
  • We have synthesized a Eu$^{2+}$-activated Sr$_3$MgSi$_2$ $O_{8}$ blue phosphor and investigated an attempt to develop blue LEDs by combining it with a InGaN blue LED chip (Len=405 nm). The InGaN-based Sr$_3$MgSi$_2$ $O_{8}$:Eu LED Lamp shows two bands at 405 nm and 460 nm. The 405 nm emission band is due to a radiative recombination from a InGaN active layer. This 405 nm emission was used as an optical transition of the Sr$_3$MgSi$_2$ $O_{8}$:Eu phosphor. The 460 m emission band is ascribed to a radiative recombination of Eu$^{2+}$ impurity ions in the Sr$_3$MgSi$_2$ $O_{8}$ host matrix. As a consequence of a preparation of W blue LED Lamp using the Sr$_3$MgSi$_2$ $O_{8}$:Eu blue phosphor, the highest luminescence efficiency was obtained at the ration of epoxy/blue phosphor(1/0,202). At this time, the CIE chromaticity was x=0.1417 and y=0.0683.