Study on Luminescent and Electron Transporting Properties of OLEDs Using Zn(phen)q and Zn(HPB)q

Recently, high luminance and efficiency were realized in organic light-emitting diodes (OLEDs) with multilayer structure. Alq3 is the most well known material and it has been used as electron transporting material in the OLEDs. We synthesized a novel materials, [(1,10-phenanthroline)(8-hydroxyquinoline)] (Zn(phen)q) and [(2-(2-hydroxyphenyl) benzoxazole)(8-hydoxyquinoline)] (Zn(HPB)q). We measured luminescent properties of Zn(phen)q and Zn(HPB)q using as emitting materials. We investigated that electron transporting properties of Zn(phen)q and Zn(HPB)q compared with those of Alq3 which is used as electron transporting materials. The LUMO level Zn(phen)q and Zn(HPB)q were measured 3.2 eV and 3.5 eV, respectively. As a result, electron transporting properties of Zn(phen)q and Zn(HPB)q were better than that of Alq3. Therefore, Zn(phen)q and Zn(HPB)q are useful as an electron transporting materials to enhance the performance of OLEDs.