Green light emission of Zn_xCd_1-xSe nanocrystals synthesized by one-pot method

We present a facile one-pot synthesis to prepare ternary Zn _xCd_1-xSe (x = 0.2, 0.5, 0.8, and 1) nanocrystals (NCs) with high emission quantum yield (QY, 4589%). The effect of Zn content (x) of Zn_xCd_1-xSe NCs on their physical properties is investigated. The NCs have a particle size of 3.2 nm and face centered cubic structure. However, the actual compositions of the NCs are Zn _0.03Cd_0.97Se, Zn_0.11Cd_0.89Se, and Zn_0.38Cd_0.62Se when Zn content is 0.2, 0.5, and 0.8, respectively. In terms of the optical properties, the emission wavelength shifts from 512 to 545 nm with increasing Zn content from 0 to 0.8 while the QY changes from 89 to 45, respectively. Partial replacement of Cd by Zn is beneficial to improve the QY of Zn_0.2 and Zn_0.5 NCs. The optical properties of ternary NCs are affected by compositional effect rather than particle size effect.