Sheet and light-emitting device

A light emitting device, comprising a light emitting body and a transparent protection layer provided on a light emitting surface of the light emitting body,

• wherein the transparent protection layer has a surface which adjoins the light emitting surface and a surface which is opposite to the adjoining surface, the opposite surface including a plurality of minute regions δ, a largest inscribed circle of the minute regions δ having a diameter from 0.2 μm to 1.5 μm, each of the minute regions δ being adjoined by and surrounded by two or more other ones of the plurality of minute regions δ,
• the plurality of minute regions δ include a plurality of minute regions δb which are randomly selected from the plurality of minute regions δ so as to constitute 40% to 98% of the minute regions δ and a plurality of minute regions δa which constitute the remaining portion of the minute regions δ,
• each minute region δa is provided with a first tiny element which has thickness d and effective refractive index na,
• each minute region δb is provided with a second tiny element which has thickness d and effective refractive index nb, nb being greater than na,
• the first tin element includes a hollow particle, and
• the second tiny element includes a solid particle.