Heterogeneous Nucleation toward Polar‐Solvent‐Free, Fast, and One‐Pot Synthesis of Highly Uniform Perovskite Quantum Dots for Wider Color Gamut Display

Abstract Inorganic halide perovskite quantum dots (IPQDs) hold great potentials for wide color gamut displays due to their high quantum yield, narrow, and composition‐tunable emissions. However, they are facing a big challenge to narrower size distribution and upscalable synthesis procedure. Here, different from the usual spontaneous nucleation, a one‐pot strategy, simply aided by uniformly heterogeneous nucleation agents, achieving mass production (≈1.8 g) with high product yield within short reaction time for various IPQDs is demonstrated. This method not only avoids the use of polar solvents, but also averts desirable transfer or injection operations. The heterogeneous nucleation takes place at surface chemical inert materials, which provide additional spatial separation effect, inhibiting the aggregative regrowth of primary IPQDs and thus enabling homogeneous nucleation and growth for various IPQDs. As a result, highly uniform IPQDs, as well as higher color purity, are achieved. Impressively, CsPbBr 3 QD dispersion exhibits ultranarrow full width at half maximum of 15.5 nm. Overall, through the novel strategy, blue, green, and red light‐emitting diodes (LEDs) achieved with good optical properties contribute to a color gamut of 140% of the National Television System Committee standard, which is among the widest color gamut in the field of QLED and hence significant for the future high‐definition display.