Brightly luminescent and color-tunable green-violet-emitting halide perovskite CH₃NH₃PbBr₃ colloidal quantum dots: An alternative to lighting and display technology

Organic-inorganic hybrid perovskite (CH₃NH₃PbX₃, X = Cl, Br, or I) quantum dots have become one of the most promising materials for optoelectronic applications. We controllably synthesized CH₃NH₃PbBr₃ quantum dots with a tunable spectrum with the emission peaks covering the range from green (523.6 nm), blue and eventually to deep violet (409.4 nm), which is wider than that of quantum dots obtained without changing the halide component. The mechanism of the blueshift was investigated. The purified quantum dots have allowed the fabrication of efficient electroluminescence devices having a simple glass/ITO/PEDOT:PSS/TFB/CH₃NH₃PbBr₃ quantum dot/TPBi/LiF/Al structure. CH₃NH₃PbBr₃ quantum dots with 5-30 μL n-octylamine showed an ideal color-saturated green emission with Commission Internationale de l'Eclairage color coordinates of (0.123, 0.744) and a narrow full width at half-maximum of 19-24 nm. The photoluminescence quantum yield was up to 90.2%. In addition, it is also worth noting that the chromaticity coordinates (x, y) of CH₃NH₃PbBr₃ quantum dots with 50-100 μL n-octylamine are (0.300, 0.344), (0.305, 0.314) and (0.323, 0.318) in the white region. All these properties indicate that these MAPbBr₃ quantum dots can provide effective data support for the application of white LEDs, and may potentially be used as single-component multicolor-emitting materials, which can be applied to lighting and display technology.