Electroluminescent device and semiconductor nanoparticle

An electroluminescent device comprising a first electrode and a second electrode spaced apart from each other;

• and a light emitting layer disposed between the first electrode and the second electrode,
• wherein the light emitting layer comprises a semiconductor nanoparticle, wherein the semiconductor nanoparticle does not comprise cadmium,
• wherein the semiconductor nanoparticle comprises a polycyclic organic ligand, the polycyclic organic ligand comprises a C6-50 condensed aromatic group represented by A1-Cy-A2, and a functional group linked to the C6-50 condensed aromatic group, the functional group is configured to link to the semiconductor nanoparticle,
• wherein first aromatic ring A1 shares two carbon atoms with cyclic moiety Cy, and second aromatic ring A2 shares two carbon atoms with the cyclic moiety Cy,
• wherein A1 and A2 are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, or a combination thereof,
• Cy is a substituted or unsubstituted four membered ring, a substituted or unsubstituted five membered ring, or a substituted or unsubstituted six membered ring, wherein if Cy is a five membered ring then the bridge atom connecting A1 with A2 is nitrogen,
• wherein the semiconductor nanoparticle is configured to emit blue light and comprises a core comprising ZnSeTe, ZnSe, or a combination thereof, and a shell disposed on the core and comprising a zinc chalcogenide.

An electroluminescent device comprising a first electrode and a second electrode spaced apart from each other;

• and a light emitting layer disposed between the first electrode and the second electrode,
• wherein the light emitting layer comprises a semiconductor nanoparticle, wherein the semiconductor nanoparticle does not comprise cadmium,
• wherein the semiconductor nanoparticle comprises a polycyclic organic ligand, the polycyclic organic ligand comprises a C6-50 condensed aromatic group represented by A1-Cy-A2, and a functional group linked to the C6-50 condensed aromatic group, the functional group is configured to link to the semiconductor nanoparticle,
• wherein first aromatic ring A1 shares two carbon atoms with cyclic moiety Cy, and second aromatic ring A2 shares two carbon atoms with the cyclic moiety Cy,
• wherein A1 and A2 are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heteroaryl group, or a combination thereof,
• Cy is a substituted or unsubstituted four membered ring, a substituted or unsubstituted five membered ring, or a substituted or unsubstituted six membered ring, wherein if Cy is a five membered ring then the bridge atom connecting A1 with A2 is nitrogen,
• wherein the electroluminescent device is configured to emit green light and exhibits a T90 of greater than or equal to about 20 hours, the device operating at a luminance of 2800 nit, or
• wherein the electroluminescent device is configured to emit blue light and exhibits a T90 of greater than or equal to about 10 hours, the device operating at a luminance of 650 nit.