Red-Enhanced White-Light-Emitting Diode Using a New Red Phosphor

Authors fabricated a high-color-rendering, red-enhanced white-light-emitting diode (LED) using a new red phosphor and a short-wavelength YAG phosphor. When the new white-LED was operated at a forward-bias current of 20 mA at RT, color temperature (Tcp), the general color rendering index (Ra) and lum...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2003-01, Vol.42 (Part 2, No.1A/B), p.L20-L23
Main Authors: Yamada, Motokazu, Naitou, Takahiro, Izuno, Kunihiro, Tamaki, Hiroto, Murazaki, Yoshinori, Kameshima, Masatoshi, Mukai, Takashi
Format: Article
Language:English
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Summary:Authors fabricated a high-color-rendering, red-enhanced white-light-emitting diode (LED) using a new red phosphor and a short-wavelength YAG phosphor. When the new white-LED was operated at a forward-bias current of 20 mA at RT, color temperature (Tcp), the general color rendering index (Ra) and luminous efficiency were 4670 K, 87.7 and 25.5 lm/W, resp. Most of the color-rendering indexes (CRIs) of the new white-LED were larger than those of current white-LEDs, in which only YAG is used. In particular, the CRI-No.9 value, which shows the color reproduction in the red region, is improved from -2.5 to 62.6. 13 refs.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.42.L20