Abstract
Abstract Photoelectric properties of all-inorganic perovskite quantum dots (IPQDs) highly depend on their synthetic route. However, current synthetic processes of IPQDs are widely facing potential unsustainable issues of containing nonreusable and high-cost auxiliary materials. In this work, full-visible-spectrum IPQDs were successfully synthesized by an environmentally friendly ion-exchange approach with a renewable and low-cost anion exchange resin. Introducing anion exchange resin brings the improvement of both optical performance and surface morphology of the prepared IPQDs. The emission wavelength of IPQDs can be precisely controlled without changing their inherent crystal phase, and those IPQD’s single crystals with poor morphology and unstable structure are selectively removed. The photoluminescence quantum yield (PLQY) and the fluorescence lifetime of the three-primary-color IPQDs can be dramatically improved to 93.69, 89.99, and 65.03% and 71.3 ns, 22.2 ns, and 13.2 ns, respectively. Notably, the red-emitting PQDs at 622 nm exhibit a record high PLQY. By using the prepared IPQDs for photoluminescent color conversion, the three-primary-color light-emitting diodes (LEDs) provided high brightness and wide color gamut simultaneously. This study provides new ideas for the environmentally friendly and sustainable synthesis route of IPQDs, and it is expected to show great ambitions in the display field.
Highlights
Perovskite quantum dots (PQDs) is currently becoming one of the most promising photoelectric materials due to their advantages of high absorption capability, narrow full width at half maximum (FWHM), high photoluminescence quantum yield (PLQY), controllable composition, and size adjustable emission spectrum, etc. [1,2,3,4,5,6,7]
2.1 CsPbBr3 PQDs based on anion exchange matrix
The temperature during thermal injection was strictly controlled at 180 °C ± 2 °C in order to obtain cubic perovskite crystals
Summary
Perovskite quantum dots (PQDs) is currently becoming one of the most promising photoelectric materials due to their advantages of high absorption capability, narrow full width at half maximum (FWHM), high photoluminescence quantum yield (PLQY), controllable composition, and size adjustable emission spectrum, etc. [1,2,3,4,5,6,7]. C. Wang et al.: Full-visible-spectrum perovskite quantum dots of lead-halide compounds through hot-injection method or by using organic ligands containing different halogens through ligand exchange reaction [28, 29]. The anion exchange resin is a kind of insoluble polymer material, neither soluble in water nor in organic solvents This means that the ion exchange resin after reaction can be recycled and reused for the next-round synthesis of PQDs, so as to save resources and reduce costs. The three-primary-color PQDs were separately mixed with polydimethylsiloxane (PDMS), and packaged on ultraviolet (UV) light-emitting diode (LED) chips as the color conversion layer These LEDs exhibiting good performance demonstrate the feasibility of this unique synthesis method and the potential application prospects in lighting or display field
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