desired emission characteristic of the present invention showing the fluorescent nanoparticles efficiently produced by the method and in this way relates to a reflection plate made of fluorescent nanoparticles can improve the optical characteristics by coating, the manufacturing method of the fluorescent nanoparticles which are monounsaturated fatty acid and a mixture of cadmium oxide in the mixed solution of the non-polar solvent solution, and the mixture was stirred 1 a first step of preparing the solution, the selenium solution and a non-polar solvent and a second step of injecting a second mixed solution was mixed with the first mixture, the first mixture and the second mixture is mixed with the third mixed solution and a third step of heating, and the fourth step of adding a trioctyl phosphine oxide and rapidly cooling the third mixture, tri heated with stirring after the addition of the stabilizer to the cadmium precursor octyl phosphine oxide mixture is added and a sixth step capped around the activator, nano-powders obtained through the fifth stage, and the fifth step of quenching. ; 展开▼