| 초록 |
Two indenopyrazine compounds for organic light emitting diodes were synthesized with phenanthrene or pyrene side groups that have high photoluminescence (PL) quantum efficiency (QE); 6,6,12,12-Tetraethyl-2,8-di-phenanthren-9-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine (PA-EIP) and 2-(10b,10c-Dihydro-pyren-1-yl)-6,6,12,12-tetraethyl-8-pyren-1-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine (PYEIP). The PL spectra of PA-EIP and PY-EIP in film state were 440 nm and 468nm in the blue region, respectively. When the synthesized compounds were used as emitting layers in non-doped OLED devices, PA-EIP and PY-EIP showed luminance efficiencies of 1.35 and 5.15 cd/A, power efficiencies of 0.69 and 2.81 lm/W, and CIEs of (0.17, 0.15) and (0.19, 0.30), respectively. This result shows that efficiency of final emitter increases with increasing efficiency of side group. |
