Light emitting device having a monotone decreasing function

摘要

The present invention provides a light emitting device. The light emitting device has a light distribution in which a light distribution I (θ, φ) obtained when light emitted from a chip of the light emitting device is directly measured is not dependent on a direction φ and is substantially represented by I (θ, φ)=I (θ). I (θ, φ) represents a light intensity distribution in a direction (θ, φ), θ represents an angle from a direction of a normal to a light extraction surface of the light emitting device (0≦θ≦90°), φ represents a rotation angle around the normal (0≦φ≦360°), and I (θ) represents a monotone decreasing function with which 0 is approached when θ=90° is satisfied. In the light emitting device, of a structural body constructing the chip of the light emitting device, with regard to a size of a portion of the structural body which is transparent to light emitted from a light emitting layer, a ratio (an aspect ratio) between the size in a lateral direction and the size in a thickness direction is not less than 5 and a structure having a light scattering function is provided on a surface of the light emitting device chip or in an interior of the transparent portion of the structural body.