| 초록 |
We synthesis two new blue emitting materials of m,o,p-TP-EPY (6,6,12,12-Tetraethyl-2,8-bis-[1,1';3',1'']terphenyl-4'-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine) and m,m,m-TP-EPY (6,6,12,12-Tetraethyl-2,8-bis-[1,1';3',1'']terphenyl-5'-yl-6,12-dihydro-diindeno[1,2-b;1',2'-e]pyrazine) were synthesized using two terphenyl units with different structures as bulky aromatic side group in the new core system of indenopyrazine (IPY). As a result of comparing the two synthesized materials, m,o,p-TP-EPY more effectively prevented intermolecular interactions compared to m,m,m-TP-EPY. Non-doped OLED device EL spectra produced using these two materials as EML also reflect such effects well. EL spectrum of m,o,p-TP-EPY (440 nm) was more blue shifted than that of m,m,m-TP-EPY (452 nm), and external quantum efficiency (E.Q.E) of m,o,p-TP-EPY (2.68 %) was also showed large improvement of about 60% compared to efficiency of m,m,m-TP-EPY (1.61 %). |
