| abstract |
A red fluorescent material includes a compound of the formula: wherein: R1, and R2 are individually alkyl of from 1 to 20 carbon atoms, aryl, carbocyclic and other heterocyclic systems; and R3, and R4 are individually alkyl of from 1 to 10 carbon atoms, and a branched or unbranched 5 or 6 member substituent ring connecting with R1, R2 respectively; and R5 is alkyl of from 2-20 carbon atoms; sterically hindered aryl and heteroaryl; and R6 is alkyl of from 1 to 10 carbon atoms, and a 5 or 6-member carbocyclic ring connecting with R5. |