New carbazole derivatives including coumarin moiety, 7-(3-Carbazol-9-yl-phenyl)-chromen-2-one (C-PCa), 7-(9-Phenyl-9H-carbazol-3-yl)-chromen-2-one (PCa-C), 7-[9-(3-Carbazol-9-yl-phenyl)-9H-carbazol-3-yl]-chromen-2-one (PDCa-C) were synthesized by Suzuki reaction. In film state, maximum UV-Vis absorption of three synthesized compounds appeared in the range 331 to 345 nm. PL spectrum of C-PCa, PCa-C and PDCa-C showed miximum emission wavelength of 449, 467 and 467 nm, respectively. C-PCa showed white emission of current efficiency of 1.16 cd/A, power efficiency of 0.59 lm/W and C.I.E of (0.26, 0.33). PCa-C showed current efficiency of 1.13 cd/A, power efficiency of 0.62 lm/W and C.I.E of (0.19, 0.27). PDCa-C showed the highest current efficiency of 1.34 cd/A, power efficiency of 0.62 lm/W and C.I.E of (0.18, 0.23).

Carbazole과 diketopyrrolopyrrole를 기본 골격으로 한 2,5-bis-(2-butyl-octyl)-3,6-bis-[5-(4-carbazol-9-ylphenyl)-thiophen-2-yl] -2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione (PCTDPP12)을 스즈키 커플링 반응을 이용하여 합성하였다. UV-Visible 분광법으로 확인 한 결과 PCTDPP의 용액과 필름의 최대 흡수 피크는 각각 643 nm와 671 nm이며, PCTDPP12의 광학적 밴드갭은 각각 1.84 eV이다. 열처리에 의해 PCTDPP12의 UV-visible 흡광도 및 최대 흡수 파장이 변화된는 것을 관찰 하였다. 그리고 순환 전압 전류법에 의해 조사한 PCTDPP12의 HOMO 및 LUMO 에너지 준위는 –5.34 eV와 -3.54 eV 이다.