PLANAR LUMINOUS BODY

摘要

A composite thin film holding board for a planar luminous body which can improve light extracting efficiency of the planar luminous body used for various types of displays represented by organic electroluminescence element, display elements, and for backlight and lighting of liquid crystal is provided, and by using such board, a high luminous efficiency planar luminous body is provided. The composite thin film holding board for the planar luminous body is a transparent board, which is provided by forming a composite thin film, including fine particles and binder, on the surface of a transparent base material. The refraction factor of the composite thin film is higher than that of the transparent base material, and the difference between the refraction factor of the fine particles included in the composite thin film and that of the binder included in the composite thin film is 0.1 or more. A ratio of (fine particle solid mass)/(binder solid mass + fine particle solid mass) is 0.01-0.5 in the composite thin film. The planar luminous body is also provided by using such composite thin film holding board.