A wavelength-tunable light-emitting source consisting of a multilayer asymmetric waveguide structure was designed, modeled, and fabricated on a silicon substrate. The structure has two layers: a silica cladding and a zirconia-Glymo (c-glycidoxypropyltrimetoxysilane) sol-gel-based waveguide layer. CdS and CdSe/ZnS colloidal nanoparticles (NPs) used as light-emission sources were incorporated into the waveguide layer. These NPs are however unstable in a low-pH environment. A zirconia-Glymo sol-gel film using acetylacetone as the zirconium chelating agent was developed, thus eliminating the often used acetic acid from the sol-gel synthesis and preserving the NPs in the waveguide formation process. The acetylacetone chelating agent allowed for a high degree of cross-linking between the Zr and the Glymo as indicated by the Zr-O-Si absorption observed by infrared spectroscopy. The incorporation of the photoemissive CdSe/ZnS core/shell nanoparticles within the zirconia gel asymmetric slab waveguide was demonstrated as a means to create miniature multispectral light sources.
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