Synthesis and electroluminescence property of new type emitting materials including diazocine for OLEDs

Four emitting compounds, namely, 2,8-Bis-(10-phenanthren-9-yl-anthracen-9-yl)-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-4), 2,8-Bis-(10-pyren-1-yl-anthracen-9-yl)-6H,12H-5, 11-methano-dibenzo[b,f][1,5]diazocine(AK-5), 2-[10-(9,9-Dimethyl-9,9a-dihydro-4aH-fluoren-2-yl)-anthracen-9-yl]-8-[10-(9,9-dimethyl-9H-fluoren-2-yl)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-6) and 2,8-Bis-[10-(spiro-fluroene)-anthracen-9-yl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK-7) were synthesized through Suzuki-coupling reaction. Physical properties such as optical, electroluminescent properties were investigated. UV-Visible spectrum of AK-4, AK-5, AK-6 and AK-7 in film state showed maximum 372, 374, 372 and 373 nm. PL spectrum of AK-4, AK-5, AK-6 and AK-7 showed maximum emission wavelength of 437, 451, 445 and 493 nm. Four compounds were used as EML in OLED device: ITO/2-TNATA(60 nm)/NPB(15 nm)/EML(35 nm)/Alq₃(20 nm)/LiF(1 nm)/Al(200 nm). AK-6 OLED device showed C.I.E. value of (0.16, 0.20) and luminance efficiency of 2.67 cd/A.