Ultralow Threshold Lasing from Carbon Dot-Ormosil Gel Hybrid-Based Planar Microcavity.

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Carbon dots (CDs) lack ideal solid matrices for harsh conditions and high optical transmittance.
• This limitation hinders the practical application of CDs in various fields.

Purpose of the Study:

• To develop a stable solid matrix for carbon dots using organically modified silicate (ormosil) gel hybrids.
• To investigate the optical properties and lasing capabilities of these CD-ormosil gel hybrids.

Main Methods:

• Incorporating carbon dots into ormosil gel to form hybrid solid matrices.
• Characterizing the photoluminescence quantum yield (PLQY) and optical gain.
• Demonstrating lasing performance in a planar microcavity setup.

Main Results:

• Achieved a stable, rigid solid matrix for carbon dots.
• Obtained a high photoluminescence quantum yield (PLQY) of 63% at 583 nm emission.
• Demonstrated peak optical gain of 67 cm⁻¹ and ultralow threshold lasing (~70 W/cm²).

Conclusions:

• CD-ormosil gel hybrids offer a promising solid matrix for advanced optical applications.
• The developed material overcomes previous limitations, enabling efficient photoluminescence and lasing.
• This advancement paves the way for new CD-based optoelectronic devices.