II-VI colloidal semiconductor nanoplatelets (NPLs) are a kind of two-dimensional nanomaterial with uniform thickness at the atomic scale, thus leading to the characteristics of tunable emission wavelength and narrow bandwidth. Here, we report wide color gamut white light-emitting diodes (WLEDs) based on high-performance CdSe-based heterostructure NPLs. The narrow-band CdSe/CdS core/crown and CdSe/ZnCdS core/shell NPLs are chosen as green (∼521 nm) and red (∼653 nm) luminescent materials, respectively. They represent excellent PL properties, such as narrow linewidth, high quantum yields, and high photostability. Importantly, the further fabricated NPL-WLEDs exhibits an ultrawide color gamut covering up ∼141.7% of the NTSC standard in the CIE 1931 color space and excellent stability towards driving currents. These outstanding device performances indicate that the colloidal semiconductor NPLs possess huge potentiality to achieve higher color saturation and wide color gamut for applications in new-generation lightings and displays.
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