Materion has been granted a patent for a wavelength conversion device that includes a substrate, a reflective layer with titanium dioxide nanoparticles, and a wavelength conversion layer. The reflective layer has enhanced thermal stability and is made up of a binder and nanoparticles with a particle size of 200-500 nanometers. The device is thermally stable at temperatures up to 250°C. Methods of manufacturing the device are also disclosed. GlobalData’s report on Materion gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Materion, Ceramic composite laminates was a key innovation area identified from patents. Materion's grant share as of September 2023 was 57%. Grant share is based on the ratio of number of grants to total number of patents.

Wavelength conversion device with thermally stable reflective layer

Source: United States Patent and Trademark Office (USPTO). Credit: Materion Corp

A recently granted patent (Publication Number: US11762190B2) describes a wavelength conversion device and a method for making it. The device includes a substrate, a reflective layer, and a wavelength conversion layer. The reflective layer is thermally stable at operating temperatures up to 250°C.

The reflective layer is made up of a binder, which can be either an organic binder comprising a silicone or an inorganic binder comprising inorganic materials such as silicates, aluminates, phosphates, borates, or inorganic sol-gels. It also includes reflective titanium dioxide (TiO2) nanoparticles that are surface modified with an organic alcohol, a siloxane, aluminum oxide (Al2O3), zirconium dioxide (ZrO2), or silicon dioxide (SiO2). These nanoparticles have a particle size ranging from about 200 nanometers to about 500 nanometers.

The thickness of the reflective layer is about 0.05 mm to about 0.15 mm. It has a high reflectivity of at least 95% for light with a wavelength between about 420 nm to about 680 nm. The wavelength conversion layer, on top of the reflective layer, is a phosphor layer that contains phosphor particles dispersed in glass, crystal, or ceramic material.

The patent also describes a method for making the wavelength conversion device. The method involves applying a composition to a substrate to form the reflective layer. The composition includes the binder and the reflective titanium dioxide nanoparticles. The composition is then cured at a temperature of 85°C to 150°C. After curing, a wavelength conversion layer is formed on top of the reflective layer.

The method allows for multiple rounds of application of the composition, with each round followed by curing, to build up the reflective layer to a thickness of about 0.05 mm to about 0.15 mm. The weight ratio of the reflective titanium dioxide nanoparticles to the binder is from about 1:2.5 to about 1:0.8.

The patent also mentions the use of a motor for rotating the substrate and the possibility of using different types of substrates, including metals, non-metallic materials, or composite materials. The patent further claims a light projection system that includes the described wavelength conversion device.

Overall, this patent presents a novel wavelength conversion device and a method for its production, which could have applications in various fields such as lighting and display technologies.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.