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Fiber Optic Center, Inc. Introduces High Refractive Index Coating For Optoelectronics, LEDs, Emissive Displays, AL-2264

date : 2017/11/21 5:53:47

FOC introduces a new product, an optical polymer dissolved in an evaporative solvent that can be applied by simple methods, i.e. dip, spin coating, drawdown, printing, etc. Upon drying it creates a hard, durable, polymer coating with a refractive index of 1.64. This polymer contains no metals, and the product contains no nanoparticles. The standard concentration leaves behind an approximately 20u layer coating thickness (using a single dip coating process). Coating thickness is easily reduced by diluting the standard concentration with the compatible solvent. The solvent is easily removed by baking at 100°C for 15 minutes.

Optically clear, high refractive index coatings can be used to improve the performance of light gathering/dispersing devices. Many solid state optical devices, i.e. imaging/optical sensors, emissive displays, LEDs, are made of light emitting semiconductors with significantly higher refractive indices (>2) than air (1.0). Light is partially reflected when it encounters a sudden difference of refractive index. Light transmission at such boundaries is improved with a layer of an intermediate refractive index material, thus improving the optical efficiency of the device – effectively raising the numerical aperture (NA) of the optical system. For semiconductors and air, that desirable refractive index is in the >1.6 range. Additionally in this case, the ‘air’ side of the coating directly contacts the environment and must be protective: hardness and durability are required; chemical resistance is a plus.

For questions on specific applications for AL-2264, Randall Elgin, Technical Manager for Specialty Products at FOC can be reached 508-717-8376 or

Additional resources from the FOC team include:

  • FOC technical solution content:
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  • Q&A Resource: email technical questions to

About Fiber Optic Center, Inc.
Fiber Optic Center, Inc., (FOC), is an international leader in distributing fiber optic components, equipment and supplies and has been helping customers make the best cable assemblies in the world for over two decades. Several areas of specialization and expertise, in which they are the industry leader, make them the preferred choice for many of the world’s fiber professionals. In these key technology areas, FOC is “at least as technical as the manufacturer” about the products they sell. Striving to “make the business part easy,” they offer outstanding and personal customer service, low or no minimum purchase order values, and from-stock delivery on industry-leading products and technology. FOC is the industry connection to the most innovative optical products, technologies and technical experts who integrate their manufacturing knowledge and vast experience into customers’ worldwide operations. For more information, visit

SOURCE: Fiber Optic Center, Inc., (FOC)


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