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Low-energy Cathodoluminescence for OxyNitride Phosphors

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Phosphor-based white LED by various glassy particles: control over luminous efficiency.

Hurriyet Yuce, Tugrul Guner, Sinan Balci

|February 1, 2019

Summary

This study introduces novel glassy scatterers to improve white light generation efficiency in remote phosphor designs by minimizing light backscattering. These scatterers enhance luminous efficiency for better lighting applications.

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Area of Science:

Materials Science
Optics
Solid State Physics

Background:

Remote phosphor white light generation faces efficiency losses from light backscattering.
This backscattering reduces the overall luminous efficiency of the generated white light.

Purpose of the Study:

To investigate the use of various glassy scatterers to mitigate phosphor conversion efficiency loss.
To enhance the luminous efficiency of white light produced by remote phosphor systems.

Main Methods:

Incorporation of different glassy scatterers (glass bubbles, beads, silica nanoparticles) into a yellow phosphor (YAG:Ce3+) and poly(dimethylsiloxane) (PDMS) matrix.
Utilizing rigorous multiple scattering simulations to analyze light behavior within the system.

Main Results:

Glassy scatterers, particularly glass bubbles, were effective in reducing light backscattering.
Simulations confirmed that refractive index mismatch and internal reflections contribute to enhanced light scattering.
Improved phosphor conversion efficiency and luminous efficiency were observed with the optimized scatterer designs.

Conclusions:

Employing carefully selected glassy scatterers is a viable strategy to overcome efficiency losses in remote phosphor white light generation.
The findings offer a pathway to more efficient and luminous solid-state lighting solutions.