WAVELENGTH CONVERSION SUBSTRATE, LIGHT-EMITTING DEVICE AND DISPLAY DEVICE COMPRISING THE SAME, LIGHTING DEVICE, AND ELECTRONIC APPARATUS

PROBLEM TO BE SOLVED: To provide a wavelength conversion substrate, a light-emitting device and a display device comprising this, a lighting device, and an electronic apparatus that prevent light extraction efficiency of light emitted at the front side of the light-emitting device from being reduced due to part of emitted light being emitted to an excitation light source side in a wavelength conversion layer included in the light-emitting device adopting a blue light color conversion method.SOLUTION: A wavelength conversion substrate 20 includes a transparent substrate, and a wavelength conversion layer 18 provided on one surface of the transparent substrate. The wavelength conversion layer 18 includes a wavelength conversion material (A) and a polymer (B). The wavelength conversion layer 18 includes at least two regions where the concentration of the wavelength conversion material (A) is different along the thickness direction.SELECTED DRAWING: Figure 1 【課題】青色光色変換方式の発光装置を構成する波長変換層において、発光した光の一部が励起光源側に出射し、発光装置の前面側に出射する光の光取り出し効率が減少することを防止する波長変換基板、発光装置並びにこれを備えた表示装置、照明装置および電子機器を提供する。【解決手段】透明基板と、該透明基板の一方の面に設けられた波長変換層１８と、を有し、波長変換層１８は、波長変換物質（Ａ）および高分子（Ｂ）を含み、波長変換層１８は、厚さ方向に沿って、波長変換物質（Ａ）の濃度が異なる少なくとも２つの領域を有する波長変換基板２０。【選択図】図１