Patent ID: 9627586
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. An electroluminescent element comprising: a first transparent electrode; a second transparent electrode; a light emitting layer sandwiched between said first transparent electrode and said second transparent electrode; a first transparent member formed on a surface of said first transparent electrode opposite to said light emitting layer; and a second transparent member formed on a surface of said second transparent electrode opposite to said light emitting layer, wherein refractive indices of said first transparent electrode and said second transparent electrode are such that as seen from said light emitting layer, a reflectance of an interface between said light emitting layer and said first transparent electrode is higher than a reflectance of an interface between said light emitting layer and said second transparent electrode, a refractive index of said first transparent member is higher than a refractive index of said second transparent member, each of a thickness of said first transparent electrode and a thickness of said second transparent electrode is not greater than a wavelength of light in said light emitting layer emitted from said light emitting layer, a thickness of said first transparent member is not smaller than a wavelength of light in said first transparent member, and a thickness of said second transparent member is not smaller than a wavelength of light in said second transparent member.