Preparation of balanced trichromatic white phosphors for solid-state white lighting

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Lighting

Background:

• High-quality white light generation in LEDs and laser diodes (LDs) relies on multi-component phosphor mixtures.
• Typical phosphor mixes contain two to four distinct components to achieve a high color rendering index (CRI).

Purpose of the Study:

• To develop a systematic experimental technique for determining phosphor proportions to achieve specific chromaticity.
• To provide a method applicable to both LED- and LD-pumped white light sources.

Main Methods:

• Determining the radiometric power of down-converted luminescence for individual phosphors.
• Estimating the CIE chromaticity coordinate of light generated from mixed phosphors.
• Investigating the impact of light scattering particles on spectral characteristics.

Main Results:

• A reliable method for creating blended phosphors with desired chromatic properties was established.
• The technique allows for precise control over the chromaticity of white light generated by LEDs and LDs.
• The study examined the influence of light scattering particles on spectral modification.

Conclusions:

• The developed method offers a systematic approach to designing phosphor mixtures for tailored white light emission.
• This technique is crucial for producing high-efficiency, phosphor-converted single-color LEDs with wide spectral width.
• The findings contribute to advancements in solid-state lighting and display technologies.