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The invention is related to the synthesis method by means of microwave, of GdBO3, YBO3 and Ba3(BO3)2 orthoborate compounds and the doping of these compounds with rare earth element ions such as Ce3+, Dy+3, Tb3+, Sm3+, Eu3+, Eu2+ in order to be used in the LED (Light Emitting Diode) industry.