UV-Curable Nanoimprint Resin with High Refractive Index
"HILUCIS"

• High refractive index (nd 1.9)
• High transparency
  light transmittance on glass : ≥ 90%
  Iow haze : ≤ 0.1%

— Contributes to Enhanced Reliability of Optical Devices

• Maintains transparency with minimal yellowing after exposure to UV radiation.
• Ensures vivid, long-lasting optical performance.

HILUCIS	Conventional high refractive index resin (Reference model)
>

< Test Conditions*
Metal halide lamp at 25mWcm2 for IS hors of exposure

 

—Contributes to Enhanced Performance and Yield of Optical Devices

• Accurately replicates intricate patterns, even with significant density variations where areas of high and Iow
  density coexist on a single substrate.
• Produces thin, uniform residual films, enhancing optical system design flexibility.

Accurately replicates intricate patterns. Produces thin, uniform residual films ( ≤ 50nm)

Imprinted with RubiQ	Imprinted with RubiQ
Imprinted with RubiQ	Imprinted with RubiQ

Background of Development

Nanoimprint technology enables the precise transfer of nanoscale patterns onto resin substrates, playing a vital role in manufacturing optical devices such as displays, smartphone cameras, AR/VR glasses, facial recognition systems, and autonomous driving sensors. These devices require advanced optical components—like waveguides and diffraction gratings—for light propagation, focusing, and diffraction.

Both glass and resin are commonly used materials for these optical components. Among them, UV-curable resins with high refractive indices have gained attention for their ability to expand viewing angles and improve light control performance while offering greater design flexibility and production efficiency. Common fillers used in high-refractive-index resins include titanium oxide and zirconium oxide. Titanium oxide, while exhibiting high optical activity, can cause photodegradation due to its photocatalytic properties under UV light, potentially compromising the resin’s durability. On the other hand, zirconium oxide has a lower refractive index compared to titanium oxide, making it challenging to achieve a refractive index above 1.8 while maintaining sufficient light resistance.

We have developed UV-curing resin with a high level of transparency, exceptional light resistance, and superior nanoimprint compatibility, successfully balancing these properties with a high refractive index.

Technical Breakthrough

HILUCIS addresses these challenges by incorporating a proprietary inorganic filler with low optical activity, minimizing yellowing in the near-UV to visible light spectrum. Leveraging Sanyo Chemical’s extensive expertise in designing UV-curable resins for display applications, the resin matrix has been carefully optimized, and HILUCIS achieves a high level of transparency, exceptional light resistance, and superior nanoimprint compatibility, successfully balancing these properties with a high refractive index.

		Refractive index
		~ 1.7	1.8	1.9~
Light resistance	Good	Zr02 type
	↑	HILUCIS
	Bad	Ti02 type