| 초록 |
Three new blue emitting compounds of 5P-VA, 5P-VTPA and 5P-DVTPA for OLED based on hexaphenyl benzene moiety were demonstrated. Physical properties by the change of the substitution groups of the synthesized materials were systematically examined. Photoluminescence (PL) spectrum of the synthesized materials showed maximum emitting wavelengths of about 400~447 nm in solution state and 451~461 nm in film state, indicating deep blue emission color.Device structure was ITO/2-TNATA 60nm/ NPB 15nm/ EML 35nm/ TPBi 20nm/ LiF 1nm/ Al 200nm. External quantum efficiencies and CIE values of 5P-VA, 5P-VTPA and 5P-DVTPA were 1.89, 3.59, 3.34 % and (0.154, 0.196), (0.150, 0.076), (0.148, 0.120), respectively. 5P-VTPA and 5P-DVTPA exhibited superior highly blue quality and thermal property such as high Td of 448 oC and 449 oC. |
