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ACS Appl Mater Interfaces. 2011 Mar;3(3):811-6. doi: 10.1021/am101160e. Epub 2011 Mar 3.

Synthesis and photoluminescent properties of (La,Ca)₃Si₆N₁₁:Ce³+ fine powder phosphors for solid-state lighting.

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1
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. suehiro@tagen.tohoku.ac.jp

Abstract

We have developed a new Ce(3+)-activated nitride phosphor, (La,Ca)(3)Si(6)N(11):Ce(3+), using the gas-reduction-nitridation method. The synthesized (La,Ca)(3)Si(6)N(11):Ce(3+) possesses tunable yellow broadband emission with the dominant wavelength of 577-581 nm and the external quantum efficiency up to ∼42%, under an excitation of 450 nm. Precise steady-state and time-resolved photoluminescence analyses revealed that the only one type of Ce(3+) center is active under the blue-light excitation. By combining the synthesized (La,Ca)(3)Si(6)N(11):Ce(3+) phosphors with the 450-nm InGaN chip, a broad range of white light with the correlated color temperatures of ∼2600-3800 K can be created, demonstrating their promising applicability to the warm-white light-emitting diodes.

PMID:
21370831
DOI:
10.1021/am101160e
[Indexed for MEDLINE]
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