Multiphoton upconversion and non-resonant optical nonlinearity in perovskite quantum dot doped glasses

Area of Science:

• Materials Science
• Optics and Photonics
• Quantum Dot Technology

Background:

• Metal halide perovskite (MHP) quantum dots (QDs) exhibit unique optical properties.
• Integrating QDs into robust hosts like glass is crucial for practical applications.
• Understanding nonlinear optical phenomena in QD-in-glass composites is essential for device development.

Purpose of the Study:

• To investigate non-resonant optical nonlinearity and multiphoton upconversion in CsPbBr3 QD-in-glass composites.
• To evaluate the potential of these materials for strong light-matter interactions.
• To assess the stability and performance compared to colloid-processed MHP QDs.

Main Methods:

• Incorporation of CsPbBr3 QDs into a monolithic inorganic glass host.
• Excitation using infrared femtosecond pulses.
• Measurement of non-resonant optical nonlinearity, multiphoton upconversion photoluminescence, and optical limiting properties.

Main Results:

• Observed stable up to four-photon upconversion photoluminescence.
• Achieved low optical limiting thresholds.
• Demonstrated high nonlinear optical absorption coefficients comparable to colloid-processed MHP QDs.
• Exhibited high robustness against air and moisture.

Conclusions:

• The CsPbBr3 QD-in-glass composite exhibits significant nonlinear optical properties and multiphoton upconversion.
• The monolithic inorganic glass host offers enhanced stability compared to traditional MHP QD processing.
• This QD-in-glass platform is a promising candidate for exploiting strong light-matter interactions in photonic devices.