Abstract
Novel α-SiAlON:Eu2+-based yellow oxynitride phosphors with the formula Sr0.375−x
Eu
x
2+Si12−m−n
Al
m+n
O
n
N16−n
(m = 0.75, n = x = 0.004–0.04) have been prepared by firing the powder mixture of SrSi2, α-Si3N4, AlN, and Eu2O3 at 2,000 °C for 2 h under 1 MPa nitrogen atmosphere. The luminescence properties, the dependence of the activator concentration
of Eu2+ and the thermal stability of Sr-α-SiAlON:Eu2+ phosphor have been investigated in comparison with Ca-α-SiAlON:Eu2+ phosphor. Similar to Ca-α-SiAlON:Eu2+ phosphor, Sr-α-SiAlON:Eu2+ phosphor has the excitation wavelength ranging from the ultraviolet region to 500 nm, and exhibit intense yellow light. The
strongest luminescence was achieved at about x = 0.02 with the emission peak at 578 nm, slightly shorter than that of Ca-α-SiAlON:Eu2+ phosphor at 581 nm. Temperature-dependent emission intensity of Sr-α-SiAlON:Eu2+ phosphor is comparable to that of Ca-α-SiAlON:Eu2+ phosphor. The results suggest that the different position of the emission peak for Sr- and Ca-α-SiAlON:Eu2+ depends on the composition and the Stokes shift, and the thermal stability is nearly independent of Sr and Ca or fixed by
the network of (Si, Al)–(O, N) in α-SiAlON at the same Eu2+ concentration.
Eu
x
2+Si12−m−n
Al
m+n
O
n
N16−n
(m = 0.75, n = x = 0.004–0.04) have been prepared by firing the powder mixture of SrSi2, α-Si3N4, AlN, and Eu2O3 at 2,000 °C for 2 h under 1 MPa nitrogen atmosphere. The luminescence properties, the dependence of the activator concentration
of Eu2+ and the thermal stability of Sr-α-SiAlON:Eu2+ phosphor have been investigated in comparison with Ca-α-SiAlON:Eu2+ phosphor. Similar to Ca-α-SiAlON:Eu2+ phosphor, Sr-α-SiAlON:Eu2+ phosphor has the excitation wavelength ranging from the ultraviolet region to 500 nm, and exhibit intense yellow light. The
strongest luminescence was achieved at about x = 0.02 with the emission peak at 578 nm, slightly shorter than that of Ca-α-SiAlON:Eu2+ phosphor at 581 nm. Temperature-dependent emission intensity of Sr-α-SiAlON:Eu2+ phosphor is comparable to that of Ca-α-SiAlON:Eu2+ phosphor. The results suggest that the different position of the emission peak for Sr- and Ca-α-SiAlON:Eu2+ depends on the composition and the Stokes shift, and the thermal stability is nearly independent of Sr and Ca or fixed by
the network of (Si, Al)–(O, N) in α-SiAlON at the same Eu2+ concentration.
- Content Type Journal Article
- DOI 10.1007/s10853-010-4327-5
- Authors
- Kousuke Shioi, SHOWA DENKO K.K. Midori Chiba 267-0056 Japan
- Naoto Hirosaki, National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan
- Rong-Jun Xie, National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan
- Takashi Takeda, National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan
- Yuan Qiang Li, National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan
- Journal Journal of Materials Science
- Online ISSN 1573-4803
- Print ISSN 0022-2461
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