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Europium location in the AlN: Eu green phosphor prepared by a gas-reduction-nitridation route
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Image of FIG. 1.
FIG. 1.

(Color online) (a) The XRD patterns of undoped AlN, Eu doped AlN prepared at 1400 °C for 1–3 h (represented by AN1h, AN2h, and AN3h, respectively), and sample AN3h after post-annealing at 1900 °C and 2100 °C for 2 h in N2 atmosphere (represented by AN19 and AN21, respectively). (b) The magnified XRD regions between 30–40° of Fig. 1(a).

Image of FIG. 2.
FIG. 2.

(Color online) Photoluminescence spectra of AlN:Eu by CR and GRN.

Image of FIG. 3.
FIG. 3.

(Color online) Normalized Eu LIII-edge XANES of AN3h, AN19, and AN21 phosphors.

Image of FIG. 4.
FIG. 4.

(Color online) EDS maps showing the distribution of Al and Eu in AN21 phosphor.

Image of FIG. 5.
FIG. 5.

TEM image (a) and ED picture (b) of the AN21 phosphor. The reference TEM image (c) and ED picture (d) for the undoped AlN are also shown as a comparison.

Image of FIG. 6.
FIG. 6.

(Color online) The Fourier transform of the Eu-LIII-edge EXAFS spectrum. The experimental curve and the fitting are shown in black and red lines, respectively.

Image of FIG. 7.
FIG. 7.

(Color online) The structure of AlN (a) and AN21 (b).

Image of FIG. 8.
FIG. 8.

(Color online) The experimental excitation spectrum and theoretical absorption spectrum.

Image of FIG. 9.
FIG. 9.

(Color online) The total DOS (top panel) and atom-resolved PDOS in AlN:Eu.


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Table I.

Comparison of oxygen content and residual carbon in the powders synthesized by SSR, GRN, and CR respectively.

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Table II.

Analytical results of EXAFS from Eu-doped AlN.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Europium location in the AlN: Eu green phosphor prepared by a gas-reduction-nitridation route