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Microparticles for light diffusion agents

Microparticles for light diffusion agents

High refractive index (1.66) organic microparticles
melamine-formaldehyde condensate microparticles (EPOSTAR™)

What are micro-particles for light diffusion (EPOSTAR™)?

Among the EPOSTAR series, the SS, S, and S6 types, which are particles with submicron (less than 1 µm) size, are used as microparticles for light diffusion applications.

These products are microparticles made from melamine-formaldehyde condensates, characterized by being organic microparticles with a high refractive index (n=1.66). There are multiple products with different particle sizes available, allowing for type selection according to product design.

Physical properties of light diffusion particles (EPOSTAR)

type	Average particle diameter (μm)	form	Refractive index	true specific gravity	Type-specific chemical names
SS	0.1	powder	1.66	1.5	Melamine-formaldehyde condensate
S	0.2
S6	0.4

Image of diffusion control for light diffusion agent micro-particles (EPOSTAR™)

EPOSTAR, an organic microparticle with a high refractive index, has low optical loss, allowing a greater amount of light to pass through materials such as QD sheets, thereby expanding the light diffusion area. This expansion is expected to enhance the visibility of displays.

Comparison of Performance between Light Diffusing Agent Microparticles (EPOSTAR™) and Titanium Oxide

Compared to titanium dioxide, which is commonly used as an inorganic light diffuser, it shows a high reflectivity in the visible light range of 400 to 800 nm.

Features of light diffusion agent micro-particles (EPOSTAR™)

1. High dispersion

EPOSTAR, used as a light-diffusing agent, has a specific gravity of 1.5, which is smaller compared to that of typical titanium oxide (about 4). It is utilized as a fine particle with fewer sedimentation concerns and excellent dispersibility.