We report on the preparation and optical characterization of a two-dimensional multicolor emission arrangement obtained by embedding high refractive-index Er3+doped CaTiO3 nanoparticles into a Nd3+doped LiNbO3 crystal substrate prepatterned with an array of microvoids. By controlling the spatial location of the rare earth ions at the micrometer scale, we show the possibility of simultaneous spatial and spectral control of the spontaneous emission in a two-dimensional rare earth optically activated array. The results can be useful for the development of microcomposite rare earth based photonic devices, such as multicolor emission displays or pixelated color structures.
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The authors acknowledge Spanish MICINN under Contract No. MAT2007-64686 and UAM-CM under Contract No. CCG07-UAM/MAT-1861.