Technology

Anti-Reflective Coatings for Solar Applications

Brisbane Materials patented technology creates a porous film of graded refractive index silica from a liquid precursor at room temperature and pressure. The coating is chemically bonded to the glass surface for optimum durability and life. Brisbane Materials coatings have more than 2.5 years of testing in a high-suns accelerated environment (equivalent to >20 years in the field), and have met all the requirements for a solar AR coating including those embedded in IEC61215. Industry-leading solar customers have evaluated Brisbane Materials AR coatings and found them to be the highest performing and most cost effective solutions available today. Brisbane Materials also has an anti-soiling materials technology for super-hydrophilic, photo-catalytic coatings alone, or in combination with anti-reflective coatings.

Brisbane Materials competitive advantage derives from its ability to produce the highest performing AR coating – 3% efficiency improvement as confirmed by leading solar module companies – at the lowest cost in the industry. Brisbane Materials AR coatings also can be tailored to the substrate, or modified to produce the desired spectral performance for the application.

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Anti-Reflective Coatings on Polymers for LED Luminaires

Improving light efficiency is a constant goal for LED chip and luminaire manufacturers in order to drive down the total cost of LED lighting. However, extracting further improvements in light output from the LED chip design and the epitaxial layer growth process has become increasingly difficult and costly. As a result, any incremental improvements in light output that can be gained from other areas with minimal cost or disruption to the LED manufacturing flow can have a significant impact on reducing overall system cost.

EV Group (EVG) and Brisbane materials (BMT) have jointly developed a turnkey manufacturing solution for a novel inorganic anti-reflective coating (ARC) material which can be processed at room temperature and under normal atmospheric conditions. This innovative technology allows for the deposition of ARC onto glass and plastic luminaires increasing transmission by up to 8% at a low cost of ownership. Custom-tailored spray deposition equipment enables the process to be scaled to large areas – e.g. a square meter – enabling large arrays of luminaires to be processed simultaneously. Additionally, spray coating enables coating onto the non-planar surfaces that are typical for LED optics.

Representative transmission spectra of the nano-porous SiO2 thin-film coatings deposited on polycarbonate (PC) and acrylic (PMMA - Polymethyl Methacrylate) substrates illustrate the significant transmission improvement achieved.

Anti-Reflective Coatings on Polymers for LED Luminaires 1

Anti-Reflective Coatings on Polymers for LED Luminaires 2

 

Applications

The application space for polymer optics is significantly extended by the use of inorganic coatings. Our innovative coating solutions provide a proven performance benefit  with our anti-reflective coating and can potentially enable additional functionalities such as increasing the durability and scratch resistance of the polymers they are deposited upon.  As our coatings serve to modify the polymer surfaces, other potential benefits such as:  protection against mechanical, chemical or biological environmental influences and modifying the wetting properties of the polymer are also being explored.

 

Key Features/Benefits:

Improved Luminous Efficiency
  •  Up to +8% increased luminous efficiency

Low Cost of Ownership
  •  Low cost materials
  •  Scalability - can process large arrays of luminaires simultaneously

Wide Applicability
  •  Room temperature process – can coat glass or temperature sensitive substrates
     (e.g. plastics, TCO glass, chemically-toughened glass)
  •  Atmospheric pressure process – replaces expensive vacuum deposition processes

Flexibility
  •  Tuneable AR properties can be optimized for dedicated spectral ranges.

High Durability
  •  Covalent bonding of the AR coating to glass and polymer surfaces