Large-Scale In Situ Formation Perovskite Quantum Dots/Elastomer Composite for High-Performance White Light-Emitting...

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Metal halide perovskite quantum dots (PQDs) show potential for light conversion applications.
• Challenges exist in integrating PQDs into polymer composites due to compatibility and scalability issues.

Purpose of the Study:

• To develop a scalable, solvent-free method for in situ synthesis of CsPbX3 (Br/Cl) QDs within halogenated butyl rubber (HIIR).
• To create stable and highly emissive PQD-polymer composites for advanced photonic applications.

Main Methods:

• A one-step, solvent-free mechanochemical strategy using open-mill shear for in situ QD synthesis.
• Characterization of CsPbBr3 QDs (2.6 nm) embedded in HIIR using spectroscopy and lifetime measurements.
• Evaluation of composite stability under ambient storage, water immersion, and blue-light irradiation.

Main Results:

• Achieved monodisperse CsPbBr3 QDs uniformly embedded in HIIR with narrow emission at 515 nm (FWHM 17 nm).
• Demonstrated high photoluminescence quantum yield (91%) and ultra-long lifetime (1189 ns).
• Composites exhibited excellent stability, retaining >90% intensity after 30-day ambient storage and 99.8% after water immersion.

Conclusions:

• The in situ generated HIIR chains form an allyl ester passivation layer, suppressing surface traps and blocking environmental degradation.
• Flexible white LEDs fabricated from the composite achieved standard white emission and a wide color gamut (132% NTSC).
• The scalable, cost-effective process offers a viable route for stretchable displays, X-ray scintillators, and wearable photonics.