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Light extraction from blue luminescent concentrator Ce:LYSO.

Bethan Ford, Lisa Lopez, Sophia Rose

|September 23, 2025

Summary

Researchers optimized light output from LED-pumped Cerium-doped Lutetium Yttrium Silicate (Ce:LYSO) luminescent concentrators. This advancement achieved a 14.1% optical-optical efficiency, significantly improving performance for high-power blue light sources.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Luminescent concentrators offer potential for efficient light conversion and delivery.
Previous LED-pumped Ce:LYSO systems faced limitations in optical-optical efficiency.

Purpose of the Study:

To optimize light emission and collection in LED-pumped Ce:LYSO luminescent concentrators.
To develop high-power broadband blue light sources with improved efficiency.

Main Methods:

Spectroscopic analysis of Ce:LYSO material.
Development of light collection and guiding strategies within the concentrator.
Utilizing UV LED panels (365 nm, 3405 W peak power) as pump sources.

Main Results:

Achieved a 14.1% optical-optical efficiency, a fourfold improvement over prior results.
Demonstrated high-power blue light output: up to 305 W in quasi-continuous mode and over 2 W in continuous mode.
Proposed various architectures for linear and circular broadband blue light sources via fiber coupling.

Conclusions:

Optimized Ce:LYSO luminescent concentrators provide a significant leap in performance for high-power blue light generation.
The developed technology is suitable for applications in medical imaging, optical metrology, and as a replacement for xenon flash lamps.