Generated White Light Having Adaptable Chromaticity and Emission, Using Spectrally Reconfigurable Microcavities

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Metal-free, luminescent, carbogenic nanomaterials (LCNMs) offer eco-friendly optical properties.
• Existing LCNMs exhibit strong blue/cyan but weak yellow/red emission, limiting applications.
• This spectral limitation hinders their use in advanced light-emitting and bio-imaging technologies.

Purpose of the Study:

• To engineer the emission spectra of LCNMs for enhanced yellow/red light output.
• To achieve tunable white-light emission (WLE) from single-component LCNMs.
• To develop a practical method for creating color-adaptable WLE devices.

Main Methods:

• Integrating single-component LCNMs into photonic microcavities.
• Spectroscopically engineering the coupling between photonic modes and optical transitions.
• Utilizing resonant photon confinement for selective re-excitation and recycling of phosphors.

Main Results:

• Achieved significantly enhanced yellow/red emissions from LCNMs.
• Demonstrated white-light emission (WLE) by combining blue/cyan and enhanced yellow/red emissions.
• Successfully generated color-adaptable WLE (cool, pure, warm) following the Planckian locus.

Conclusions:

• Photonic microcavities can reconfigure LCNM emission spectra without chemical modification.
• The approach provides a low-cost, practical method for chromaticity-adjustable WLE.
• This work paves the way for practical WLE devices using single-component luminescent materials.