Highly luminescent CdSe/ZnS nanocrystals were obtained by adapting non-TOP-based synthesis and a subsequent two-phase ZnS shelling procedure: the core CdSe nanocrystals were synthesized in sole solvent paraffin liquid with cadmium oxide, elemental sele-nium, and oleic acid; the deposition of the ZnS shell was conducted by using zinc stearate in toluene and sodium sulfide in deionized water. The green and low-cost route was proved to be more efficient to constrain the size of core nanocrystals while tuning the growth of shell particles, which results in high quantum yields of CdSe/ZnS nanocrystals. The present route is accessible to laborato-ries with limited synthetic expertise to create CdSe/ZnS nanocrystals and easily scaled up to industrial applications.