The invention discloses a lighting source. The lighting source comprises a scattering layer, a light guide plate arranged at one side of the scattering layer and an organic color conversion layer arranged at the other side of the scattering layer. At least one edge of the light guide plate is equipped with an excitation light source. According to the lighting source, through adoption of photoluminescence and a fluorochrome system with low cost, the cost is greatly reduced, moreover, a high color rendering plane lighting panel is obtained, the dark blue light radiation of the lighting source is effectively reduced, dark red light components are increased, a color rendering property is improved, and especially an R9 value is improved.