Electroluminescent materials and devices

An electroluminescent device comprising:

• (i) a first electrode;
• (ii) a second electrode;
• and
• (iii) a layer of an electroluminescent material and a fluorescent or phosphorescent dopant positioned between said first and second electrodes, wherein said electroluminescent material is a compound selected from the group of compounds whose formulae are indicated below:

An electroluminescent composition comprising

• (a) a compound of formula (I) below;
• wherein M is lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, copper, silver, gold, zinc, boron, aluminum, gallium, indium, germanium, tin, antimony, lead, manganese, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, cadmium or chromium;
• n is the valence of M;
• and R1, R2 and R3 can be the same or different, and are selected from hydrogen, a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aromatic, heterocyclic or polycyclic ring structure, a fluorocarbon, a halogen or a nitrile group;
• and
• (b) a fluorescent or phosphorescent dopant.