Water- and Light-Stable Red-Emitting Perovskite Quantum Dots by Silane-Siloxane Dual Encapsulation for Full-Color...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Red-emitting perovskite quantum dots (Red-PQDs) are essential for full-color displays but suffer from poor stability due to ionic bonding and phase instability.
• Degradation issues hinder the practical application of Red-PQDs as reliable light emitters.

Purpose of the Study:

• To develop highly stable Red-PQDs for practical implementation in display technologies.
• To overcome the critical barrier of Red-PQD degradation in diverse environmental conditions.

Main Methods:

• A dual encapsulation strategy was employed, introducing silane-based ligands and a siloxane-based encapsulation matrix.
• Surface functionalization and passivation of cationic defects were achieved using silane ligands.
• Optical, chemical, and molecular-scale analyses were used to elucidate the stability mechanism.

Main Results:

• The developed Red-PQDs demonstrated long-term stability, preserving photoluminescence quantum yield (PLQY) for over 60 days in air, water, and under continuous blue light irradiation.
• Optimized silane ligand composition resulted in high PLQY and pure red emission.
• Color-converting films using these Red-PQDs maintained stability for over 60 days in water.

Conclusions:

• The dual encapsulation strategy effectively enhances the stability of Red-PQDs, addressing a key challenge for their use in displays.
• These stable Red-PQDs show significant potential for advanced color-converting layers in next-generation display technologies.