Properties of SiAlON powder phosphors for white LEDs

Three kinds of Eu2+-doped oxynitride powder phosphors, including green β-SiAlON, yellow Ca-α-SiAlON and newly developed orange Ca-α-SiAlON were prepared by gas pressure sintering, which emit the fluorescent light with emission peak at 540nm, 585nm and 597nm, respectively. Emission intensity more tha...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-06, Vol.32 (7), p.1355-1358
Main Authors: Yamada, Suzuya, Emoto, Hideyuki, Ibukiyama, Masahiro, Hirosaki, Naoto
Format: Article
Language:English
Subjects:
Color
Colour
Emission analysis
Humidity
Light-emitting diodes
Optical property
Oxynitrides
Phosphor
Phosphors
Rendering
SiAlON
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Summary:Three kinds of Eu2+-doped oxynitride powder phosphors, including green β-SiAlON, yellow Ca-α-SiAlON and newly developed orange Ca-α-SiAlON were prepared by gas pressure sintering, which emit the fluorescent light with emission peak at 540nm, 585nm and 597nm, respectively. Emission intensity more than 90% can be kept in the range of temperature from 30°C to 200°C. Emission characteristics are stable after long-term exposure testing for 6000h at temperature of 85°C and in humidity of 85%. A white LED device composed of a blue LED chip, β-SiAlON and orange Ca-α-SiAlON phosphors exhibits a modest colour rendering index of 72.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.05.050