Abstract
Novel α-SiAlON:Eu2+-based yellow oxynitride phosphors with the formula Sr0.375−x Eu 2+ x Si12−m−n Alm+nO 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.
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The authors gratefully acknowledge Ms. Kazuko Nakajima for the preparation of white-LEDs and the measurement of the optical properties.
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Shioi, K., Hirosaki, N., Xie, RJ. et al. Photoluminescence and thermal stability of yellow-emitting Sr-α-SiAlON:Eu2+ phosphor. J Mater Sci 45, 3198–3203 (2010). https://doi.org/10.1007/s10853-010-4327-5
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DOI: https://doi.org/10.1007/s10853-010-4327-5