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We present L-cysteine capped CdO_XTe_1−X and CdTe_XSe_1−X nanoparticles (NPs) prepared in one pot. The as-prepared CdO_XTe_1−X NPs were found to have a hexagonal crystal structure of CdTe with a cubic phase of CdO. There was, however, change in phase to cubic type when 2 mM of Se was introduced into the CdTe at 60 min of reaction time. The average crystallite sizes obtained from X-ray diffraction analysis for CdO_XTe_1−X and CdTe_XSe_1−X NPs were in the range of 10–36 nm. The diffraction peaks shifted to higher diffraction angle with longer growth time. Scanning electron microscope images display change in shape and size as reaction progress. Photoluminescence (PL) emission was observed to shift from 510–566 nm and 620–653 nm for CdO_XTe_1−X and CdTe_XSe_1−X NPs respectively followed by variation in the peak intensities. The emission spectra displayed a good symmetry and a narrow …