NOVELTY - Luminescent compounds (I) are new.    USE - (I) are useful as photoactive layer in an electronic device (claimed) including LED, LED display, lighting device, luminaire, diode laser, photodetector, photoconductive cell, photoresistor, photoswitch, phototransistor, phototubes, IR detector, biosensor, photovoltaic device or solar cell, transistor and diode.    ADVANTAGE - (I) provide the electronic device exhibiting excellent luminescence.    DETAILED DESCRIPTION - Luminescent compounds (I) of formulae (I-1)-(I-15) are new.    R1, R1a, R2, R2a, R2b = H, deuterium, F, CN, alkyl, fluoroalkyl, aryl, heteroaryl, silyl, deuterated alkyl, deuterated partially-fluorinated alkyl, deuterated aryl, deuterated heteroaryl, deuterated silyl, alkoxy, aryloxy, fluoroalkoxy, siloxane, siloxy, deuteroalkoxy, deuteroaryloxy, deuterofluoroalkoxy, deuterosiloxane or deuterosiloxy; either    R3, R3a, R4, R4a, R5, R6 = deuterium, F, CN, alkyl, fluoroalkyl, aryl, heteroaryl, silyl, deuterated alkyl, deuterated partially-fluorinated alkyl, deuterated aryl, deuterated heteroaryl, deuterated silyl, alkoxy, aryloxy, fluoroalkoxy, siloxane, siloxy, deuteroalkoxy, deuteroaryloxy, deuterofluoroalkoxy, deuterosiloxane or deuterosiloxy; or    adjacent R3, R3a, R4 and R4a together = fused ring; either    R7 = alkyl, aryl or their deuterated analogs; or    two R7 alkyl = cycloalkyl spiro ring; or    two R7 phenyl = spiro fluorene; either    R10 = deuterium, F, CN, alkyl, fluoroalkyl, aryl, heteroaryl, silyl, deuterated alkyl, deuterated partially-fluorinated alkyl, deuterated aryl, deuterated heteroaryl, deuterated silyl, alkoxy, aryloxy, fluoroalkoxy, siloxane, siloxy, deuteroalkoxy, deuteroaryloxy, deuterofluoroalkoxy, deuterosiloxane or deuterosiloxy; or    adjacent R10 groups = fused ring;    a, b = 0 or 1;    w1, x = 0-3;    x1, y = 0-4;    y1, z = 0-5; and    z1 = 0-6.    Provided that: at least one of R1 and R1a is heteroaryl or deuterated heteroaryl; a+b = greater than or equal to 1; when a is 1 then w1 is 0-2; when a is 1 then x1 is 0-3; when b is 1 then y1 is 0-4; and when b is 1 then z1 is 0-5. An INDEPENDENT CLAIM is also included for an electronic device (100) comprising at least one photoactive layer (140), where the photoactive layer comprises (I).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic illustration of organic light-emitting device.    Organic light-emitting device (100)    Anode layer (110)    Injection layer (120)    Photoactive layer (140)    Cathode layer (160)