Light-emitting element, light-emitting device using the light-emitting element, and transparent substrate used in light-emitting elements

A structure configured to be attached to a light-emitting layer comprising:

• a transparent substrate;
• a transparent electrode;
• a particle layer and an adhesive layer provided between the transparent substrate and the transparent electrode;
• and
• a release film provided on a side of the adhesive layer that is opposite to a side on which the particle layer is provided,
• wherein the particle layer includes particles having a refraction index that is higher than a refraction index of the transparent electrode,
• wherein the adhesive layer has grooves formed in a surface on a side on which the release film is provided,
• wherein the particles constituting the particle layer are configured to cause light from the light-emitting layer to scatter and wherein the particle layer has an average thickness that is less than an average particle size of the particles to improve extraction of light from the light-emitting layer.

A light-emitting element, comprising:

• a light-emitting layer provided between a transparent electrode and an electrode;
• a transparent substrate provided on a side of the transparent electrode that is opposite to a side on which the electrode is provided;
• a particle layer provided between the transparent electrode and the transparent substrate;
• and
• an adhesive layer provided between the transparent electrode and the particle layer,
• wherein the particle layer includes particles having a refraction index that is higher than a refraction index of the transparent electrode,
• means for improving extraction of light from the light-emitting layer by configuring the particles constituting the particle layer to cause light from the light-emitting layer to scatter and to have an average particle size be larger than an average thickness of the particle payer.