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Narrow-Band Red Emission in the Nitridolithoaluminate Sr4[LiAl11N14]:Eu2+

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journal contribution
posted on 26.12.2016, 00:00 by Dominik Wilhelm, Dominik Baumann, Markus Seibald, Klaus Wurst, Gunter Heymann, Hubert Huppertz
The new narrow-band red-emitting phosphor material Sr4[LiAl11N14]:Eu2+ was synthesized by solid-state reaction using a tungsten crucible with a cover plate in a tube furnace. When excited with blue light (460 nm), it exhibits red fluorescence with an emission maximum at 670 nm and a full width at half-maximum of 1880 cm–1 (∼85 nm). The crystal structure was solved and refined from single-crystal X-ray diffraction data. This new compound from the group of the nitridolithoaluminates crystallizes in the orthorhombic space group Pnnm (No. 58) with the following unit-cell parameters: a = 10.4291(7) Å, b = 10.4309(7) Å, and c = 3.2349(2) Å. Sr4[LiAl11N14]:Eu2+ shows a pronounced tetragonal pseudo-symmetry. It consists of a framework of disordered (Al/Li)­N4 and AlN4 tetrahedra that are connected to each other by common corners and edges. Along the [001] direction, the tetrahedral network creates empty four-membered-ring channels as well as five-membered-ring channels, in which the Sr2+ cations are located.

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