Bright Yellow Glow

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Science  25 Jan 2008:
Vol. 319, Issue 5862, pp. 387
DOI: 10.1126/science.319.5862.387c

One approach for creating white-light sources is to integrate a yellow phosphor with a blue light-emitting source. Yellow phosphors usually comprise rare earth (Ce or Eu) ions in an inorganic host matrix. Recently, it was shown that large-channel Zn-Ga phosphates could exhibit yellow-to-white luminescence. Yang and Wang now report that an organic-inorganic microporous analog is a highly efficient yellow phosphor with photoluminescent quantum efficiencies that can exceed 40%. These materials contain hexameric Ga clusters, Ga6(OH)4O26, that are connected in a two-dimensional network through bridging phosphate and oxalic acid groups. This anionic framework is charge-balanced by organic dications. The authors suggest that the intrinsic disordered nature of the lattice creates defect sites at pairs of Ga atoms in the largest pore that act as activator sites for emission. — PDS

J. Am. Chem. Soc. 130, 10.1021/ja7101423 (2008).

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