Emulsion synthesis of size-tunable green emitting halide perovskite CH3NH3PbBr3 colloidal quantum dots

We controllably synthesized CH₃NH₃PbBr₃ quantum dots with a tunable spectrum with the emission peaks covering the range from green (523.6 nm), to blue and eventually to deep violet (432.9 nm), which is wider than that of quantum dots obtained without changing the halide component. The mechanism of photoluminescence spectral blueshift of CH₃NH₃PbBr₃ quantum dots was investigated. The CH₃NH₃PbBr₃ quantum dots with 5–30 μL n-octylamine showed an ideal color-saturated green emission and a narrow full width at a half-maximum of 19–24 nm. The photoluminescence quantum yielded up to 90.2%. All these properties indicate that these quantum dots can provide the effective data support for application to white LEDs, and may potentially be used as single-component multicolor-emitting materials, which can be applied to lighting and display technology.