A diaryloxybenzoxadiazole compound having the general formula (Ia) and disubstituted with a
thiophene group, wherein: -Z represents a
sulfur atom, an
oxygen atom, or a
selenium atom; or an NR5 group, wherein R5 is selected from straight-chain or branched C1-C groups. 20 Preferably C1-C8
alkyl, or selected from optionally substituted
aryl groups; -R1, R2, and R3, which may be the same or different from each other, representing
hydrogen atoms; or selected from straight-chain or branched C1-C groups optionally containing heteroatoms. 20 Preferably C1-C8
alkyl, optionally substituted cycloalkyl, optionally substituted
aryl, optionally substituted straight-chain or branched C1-C 20 Preferably, it contains C1-C8 alkoxy groups and -COOR6 groups, wherein R6 is selected from straight-chain or branched C1-C6 groups. 20 The preferred
alkyl group is C1-C8, or cyano; R1 and R2 may optionally be combined to form a saturated, unsaturated, or aromatic cyclic or polycyclic
system containing 3 to 14 carbon atoms, preferably 4 to 6 carbon atoms, together with the carbon atoms to which they are bonded, which optionally contains one or more heteroatoms, such as, for example,
oxygen,
sulfur,
nitrogen,
silicon,
phosphorus,
selenium; R4 may be the same as or different from each other, selected from optionally substituted
aryl groups. The diaryloxybenzoxadiazole compound having the general formula (Ia) and disubstituted with a thienophene group can be advantageously used as a spectral converter in a light-emitting
solar concentrator (LSC), which in turn can improve the performance of a photovoltaic device (or solar device) on a rigid or flexible support, for example, a selection between photovoltaic cells (or solar cells) and photovoltaic modules (or solar modules). More specifically, the photovoltaic device (or solar device) can be advantageously used to construct a
greenhouse.