Color-Tunable Perovskite Nanomaterials with Intense Circularly Polarized Luminescence and Tailorable Compositions

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Designing perovskite nanocrystals (PNCs) with circularly polarized luminescence (CPL) is crucial for photonic technologies.
• Achieving full-color tunability, high CPL performance, and long-term stability in PNCs remains a significant challenge.

Purpose of the Study:

• To develop a robust strategy for creating CPL-active PNCs with full-color tunability, enhanced CPL, and improved stability.
• To utilize chiral nematic mesoporous silica (CNMS) as a host for in situ confined growth of achiral PNCs.

Main Methods:

• In situ confined growth of diverse achiral PNCs within a chiral nematic mesoporous silica (CNMS) host.
• Strategic engineering of photonic bandgap, PNC loading, and PNC cation/anion composition.
• Fabrication of circularly polarized light-emitting diode devices using the developed PNCs-CNMS composite.

Main Results:

• Achieved stable, full-color tunable CPL emissions from PNCs-CNMS with luminescent dissymmetric factors up to -0.17.
• Demonstrated exceptional resistance to humidity, photodegradation, and thermal stress (up to 95 °C) due to the silica host.
• Showcased reversible CPL switching capabilities by leveraging CNMS matrix responsiveness or PNC dynamic behavior.

Conclusions:

• The developed strategy provides a powerful platform for designing functional chiroptical materials.
• The PNCs-CNMS composite offers a promising route towards stable, tunable CPL emitters for advanced photonic devices and displays.