Opal glasses for light extraction

摘要

Opal glass compositions and devices incorporating opal glass compositions are described herein. The compositions solve problems associated with the use of opal glasses as light-scattering layers in electroluminescent devices, such as organic light-emitting diodes. In particular, embodiments solve the problem of high light absorption within the opal glass layer as well as the problem of an insufficiently high refractive index that results in poor light collection by the layer. Particular devices comprise light-emitting diodes incorporating light scattering layers formed of high-index opal glasses of high light scattering power that exhibit minimal light attenuation through light absorption within the matrix phases of the glasses.

主权项

1. An opal glass sheet of Li2O—TiO2—SiO2 or Li2O—TiO2—SiO2—P2O5 composition for use in an electroluminescent device comprising a vitreous or crystalline TiO2 light scattering phase and having a thickness not exceeding 500 μm, a refractive index of at least 1.6, and attenuation coefficient below 0.04 cm−1 at a light wavelength of 400 nm.