Luminescent solar concentrator (LSC) comprising at least one disubstituted benzoselenadiazole compound having general formula (I): R1, R2, R3, R4 and R5, equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched C1-C20, preferably C1-C10, alkyl groups, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched C1-C20, preferably C1-C10, alkoxyl groups, optionally substituted; or R1 and R2, can be possibly bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, possibly containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; or R3 and R4, can be possibly bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, possibly containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; or R4 and R5, can be possibly bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, possibly containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium.(img file=DPA0000183055600000011.tif wi=970 he=408/).