The invention relates to purely organic molecules according to formula A without metal center and their use as emitters in organic light-emitting diodes (OLEDs) and in other optoelectronic devices with Y is independently selected from the group consisting of C, PR, S, and S(═O); W is independently selected from the group consisting of C(CN)2, NR, O, and S; X is selected from the group consisting of CR2, C═C(CN)2, NR, O, and S; Ar is a substituted aryl or heteroaryl group with 5 to 40 aromatic ring atoms, which is substituted with m same or different radicals R* and with n same or different donor groups D with electron-donating properties, wherein m+n equals the number of substitutable ring atoms and wherein D comprises a structure of formula I: wherein A and B are independently selected from the group consisting of CRR′, CR, NR, and N, wherein there is a single of a double bond between A and B and a single or a double bond between B and Z; Z is a direct bond or a divalent organic bridge group selected from the group consisting of a substituted or unsubstituted C1-C9-alkylene group, C2-C8-alkenylene group, C2-C8-alkynylene or arylene group or a combination of these, —CRR′, —C═CRR′, —C═NR, —NR—, —O—, —SiRR′—, —S—, —S(O)—, —S(O)2—, O-interrupted substituted or unsubstituted C1-C9-alkylene, C2-C8-alkenylene, C2-C8-alkynylene or arylene groups, and phenyl or substituted phenyl units; wherein the waved line indicates the position over which D is bound to Ar.