LIGHT EMITTING APPARATUS

摘要

An illuminator includes a light-emitting element and a light extraction sheet which transmits light occurring from the light-emitting element. The light-emitting element includes a first electrode having a light transmitting property, a second electrode, and an emission layer between the first and second electrodes. The light extraction sheet includes a light-transmitting substrate having a first face and a second face, a first light extraction structure on the first face side of the light-transmitting substrate, and a second light extraction structure on the second face side of the light-transmitting substrate. The first light extraction structure includes a low-refractive index layer and a high-refractive index layer having a higher refractive index than the low-refractive index layer. The second light extraction structure is arranged so that light which is transmitted through the light-transmitting substrate and arrives at an incident angle of 60 to 80 degrees has an average transmittance of 20% or more.

主权项

1. An illuminator comprising:
a light-emitting element for emitting light of an average wavelength λ; and a light extraction sheet which transmits light occurring from the light-emitting element, the light-emitting element including
a first electrode having a light transmitting property,a second electrode, andan emission layer between the first and second electrodes, and the light extraction sheet including:
a light-transmitting substrate having a first face on the light-emitting element side and a second face on an opposite side from the light-emitting element;a first light extraction structure on the first face side of the light-transmitting substrate, the first light extraction structure including a low-refractive index layer and a high-refractive index layer having a higher refractive index than does the low-refractive index layer, the low-refractive index layer being between the light-transmitting substrate and the high-refractive index layer, and an interface between the high-refractive index layer and the low-refractive index layer having bump-dent features; anda second light extraction structure on the second face side of the light-transmitting substrate, the second light extraction structure being arranged so that light which is transmitted through the light-transmitting substrate and arrives at an incident angle of 60 degrees to 80 degrees has an average transmittance of 20% or more.