LIGHT-EMITTING DEVICE, LIGHT-EMITTING APPARATUS, ELECTRONIC APPLIANCE, DISPLAY DEVICE, ILLUMINATION DEVICE

To provide a novel light-emitting device, light-emitting apparatus, electronic appliance, display device, and illumination device with excellent convenience, usefulness, or reliability.SOLUTION: A light-emitting device includes a first electrode, a second electrode, a first layer, and a second layer. The second electrode includes a region overlapping with the first electrode. The first layer includes a region held between the first electrode and the second electrode. The first layer includes a light-emitting material. The light-emitting material has a function of emitting photoluminescence light in a solution. The photoluminescence light has a first spectrum. The first spectrum has a maximum peak at a wavelength λ1 and the wavelength λ1 is in the range of 440 nm or more and 470 nm or less. The second layer includes a region held between the first layer and the second electrode. The second layer includes a first organic compound. The first organic compound has a first refractive index n1 with respect to the light including the wavelength λ1. The first refractive index n1 is 1.4 or more and 1.75 or less.SELECTED DRAWING: Figure 1 【課題】利便性、有用性または信頼性に優れた新規な発光デバイス、発光装置、電子機器、表示装置、照明装置を提供する。【解決手段】第１の電極と、第２の電極と、第１の層と、第２の層と、を有する発光デバイスであって、第２の電極は第１の電極と重なる領域を備え、第１の層は第１の電極および第２の電極の間に挟まれる領域を備え、第１の層は発光性の材料を含み、発光性の材料は溶液中でフォトルミネッセンス光を発する機能を有し、フォトルミネッセンス光は第１のスペクトルを備え、第１のスペクトルは波長λ１に最大ピークを備え、波長λ１は４４０ｎｍ以上４７０ｎｍ以下の範囲にある。第２の層は第１の層および第２の電極の間に挟まれる領域を備え、第２の層は第１の有機化合物を含み、第１の有機化合物は、波長λ１を備える光に対して、第１の屈折率ｎ１を備え、第１の屈折率ｎ１は１．４以上１．７５以下である。【選択図】図１