Enhanced Stabilities and Production Yields of MAPbBr₃ Quantum Dots and Their Applications as Stretchable and Self-Healable Color Filters

Abstract

Organic–inorganic hybrid CH3NH3PbBr3 (MAPbBr3) perovskite quantum dots (PQDs) are considered as promising and cost-effective building blocks for various optoelectronic devices. However, during centrifugation for the purification of these PQDs, commonly used polar protic and aprotic non-solvents (e.g., methanol and acetone) can destroy the nanocrystal structure of MAPbBr3 perovskites, which will significantly reduce the production yields and degrade the optical properties of the PQDs. This study demonstrates the use of methyl acetate (MeOAc) as an effective non-solvent for purifying as-synthesized MAPbBr3 PQDs without causing severe damage, which facilitates attainment of stable PQD solutions with high production yields. The MeOAc-washed MAPbBr3 PQDs maintain their high photoluminescence (PL) quantum yields and crystalline structures for long periods in solution states. MeOAc undergoes a hydrolysis reaction in the presence of the PQDs, and the resulting acetate anions partially replace the original surface ligands without damaging the PQD cores. Time-resolved PL analysis reveals that the MeOAc-washed PQDs show suppressed non-radiative recombination and a longer PL lifetime than acetone-washed and methanol-washed PQDs. Finally, it is demonstrated that a composite of the MAPbBr3 PQDs and a thermoplastic elastomer (polystyrene-block-polyisoprene-block-polystyrene) is feasible as a stretchable and self-healable green color filter for a white light-emitting diode device.

Efficient charge transfer from organometal lead halide perovskite nanocrystals to free base meso-tetraphenylporphyrins

“…2 . Before the quenching experiment, we noticed a blue shift in the emission peak of the PNC samples as compared to a previous report 47 due to the dilution effect.…”

Perovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives

“…Yang et al [119] compounded PQDs and thermoplastic elastomer into a stretchable and self-healing filter film. Furthermore, they fabricated and sequentially stacked green (MAPbBr 3 ) and red (CsPbBr 0.6 I 2.4 ) composite films, which can be excited by a blue LED to realize white light.…”

Water-Assisted Perovskite Quantum Dots with High Optical Properties

“…To investigate the effects of the water-assisted procedure on a perovskite crystal structure on the prepared MAPbBr 3 PeQDs, their XRD patterns were measured. From XRD patterns, the prepared samples with between 0 vol% and 0.16 vol% of assisting water obviously show the strong peaks attributed to the (100), ( 110), ( 200), ( 210), (220), and (300) diffraction planes (Figures 4 and S3), which indicated a cubic perovskite crystal structure [23,24]. The XRD patterns results showed that the optimal water-assisted content will not have a negative effect on the crystal structure.…”