LIGHT EMITTING ELEMENT
First Claim
1. A light emitting element having a structure in which an emission layer is excited to emit light by an excitation source and the light is extracted from the emission layer to an outside,the light emitting element comprising a back surface member, which is provided on a side of the emission layer opposite to a light extraction side,wherein the back surface member comprises in order from the emission layer side:
- a dielectric layer which has a smaller effective refractive index than an effective refractive index of the emission layer; and
a metal fine patterned layer which interacts with light that is emitted from the emission layer to enter the metal fine patterned layer via the dielectric layer, to thereby change level of reflectance according to a wavelength of the light, andwherein, when a critical angle determined by conditions for total reflection at an interface between the emission layer and the dielectric layer is expressed by the following expression (1), a back surface member reflectance with respect to light with an incident angle larger than the critical angle is higher than a back surface member reflectance with respect to light with an incident angle smaller than the critical angle.
1 Assignment
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Accused Products
Abstract
Provided is a light emitting element capable of reducing external light reflectance while maintaining high light extraction efficiency, having a structure including a back surface member provided on a side of an emission layer opposite to a light extraction side, the back surface member including in order from the emission side: a dielectric layer having a smaller effective refractive index than that of the emission layer; and a metal fine patterned layer interacting with light entering a metal fine patterned layer to change level of reflectance, and back surface member reflectance with respect to light with an incident angle larger than the critical angle determined by conditions for total reflection at an interface between the emission and the dielectric layer is higher than back surface member reflectance with respect to light with an incident angle smaller than the critical angle.
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Citations
13 Claims
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1. A light emitting element having a structure in which an emission layer is excited to emit light by an excitation source and the light is extracted from the emission layer to an outside,
the light emitting element comprising a back surface member, which is provided on a side of the emission layer opposite to a light extraction side, wherein the back surface member comprises in order from the emission layer side: -
a dielectric layer which has a smaller effective refractive index than an effective refractive index of the emission layer; and a metal fine patterned layer which interacts with light that is emitted from the emission layer to enter the metal fine patterned layer via the dielectric layer, to thereby change level of reflectance according to a wavelength of the light, and wherein, when a critical angle determined by conditions for total reflection at an interface between the emission layer and the dielectric layer is expressed by the following expression (1), a back surface member reflectance with respect to light with an incident angle larger than the critical angle is higher than a back surface member reflectance with respect to light with an incident angle smaller than the critical angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification