dispostivo emissor de luz, fonte de luz de superfície, dispositivo de vídeo de cristal líquido e método para a fabricação de dispositivo emissor de luz

摘要

A light emitting device (10) includes: a substrate (21) having a main surface (22); a phosphor layer (31) provided on the main surface (22) and containing an LED element (26) that emits primary light and a fluorescent particle (36) that absorbs a part of the primary light and emits secondary light; and a transparent resin layer (41) having a refractive index n and covering the phosphor layer (31). The transparent resin layer (41) has an outer circumferential surface (42) that forms a boundary between the transparent resin layer (41) and the atmosphere. When a minimum circumference (101) that includes the overall phosphor layer (3 1) and is concentric with the outer circumferential surface (42) has a radius r in a cut surface where at least a part of the outer circumferential surface (42) takes a shape of an arc having a radius R, a relationship of R>r€¢n is satisfied. With such configuration, the light extraction efficiency is enhanced.