TRANSPARENT DIFFUSIVE OLED SUBSTRATE AND METHOD FOR PRODUCING SUCH A SUBSTRATE

摘要

The invention is drawn to a method for preparing a laminate substrate for a light emitting device, comprising (a) providing a glass substrate (1) having a refraction index of between 1.45 and 1.65, (b) coating a metal oxide layer (2) onto one side of the glass substrate, (e) coating a glass frit (3) having a refractive index of at least 1.7 onto said metal oxide layer (2), said glass frit comprising at least 30 weight % of Bi2O3, (c) firing the thus coated glass substrate at a temperature comprised between 530 °C and 620 °C thereby making react the metal oxide with the melting glass frit and forming a high index enamel layer (4) with a plurality of spherical voids (5) embedded in the lower section of the enamel layer near the interface with the glass substrate.