Laser highlighting on a flat panel display coated with a double-layered anti-reflection film containing a europium(iii) complex

Abstract

We report a photosensitive, double-layered anti-reflection film, which is composed of a UV cured acrylate film containing a photoluminescent europium(III) complex as a high refractive index layer and a film of a colloidal nano-silica as a low refractive index layer. The refractive index of the high refractive index layer can be tuned from 1. 53 to 1.69 as the composition of the europium(III) complex increases. The reflectance of the anti-reflection film on the glass substrate is as low as 0.48% when the refractive indices and thicknesses of the two layers are controlled. The anti-reflection film is applied as the top layer of a liquid crystal display (LCD). Since the absorption and excitation spectra of the europium(III) complex barely overlap with the backlight spectrum of the LCD, the europium(III) complex in the anti-reflection film does not disturb the display images. The images are visible even under irradiation using an indoor fluorescent lamp. It is also possible to highlight a specific point on the display screen using laser light. When a 405 nm laser pointer is aimed at a specific area, the area appeared as a bright red spot.