Novel synthesis of highly phenyl-substituted spirobifluorene and carbazole derivatives through Diels-Alder reaction for light-emitting diodes

Abstract

We synthesized and characterized novel highly phenyl-substituted spirobifluorene and carbazole derivatives such as 3,6-bis[(2,3,4,5-tetraphenyl)phenyl]-9-ethylcarbazole (BTPEC); 3,6-bis(7,10-diphenyl-fluoranthene)-9-ethylcarbazole (BDFEC); 2,7-Bis[(2,3, 4,5-tetraphenyl)phenyl]-9,9'-spirobifluorene (BTPSF); and 3,6-bis(7,10-diphenyl-fluoran-thene)-9,9'-spirobifluorene (BDFSF), through Diels-Alder reaction. BDFEC showed sky blue PL spectrum at 481 nm and BTPSF showed ultra-violet PL spectrum at 374 nm in chloroform solution. Also BTPEC and BDFSF exhibited PL spectrum at around the UV region, 390 and 467 nm.