The Study Of Physical Properties Of Organic Metal Chelates As Organic Electroluminescent Materials

Organic electroluminescent device (OLED) is a study hotspot in flat panel display and illuminance fields. In this technology, the design and synthesis of materials are core, studies on their physical properties in relation to organic electroluminescence are keys. In this paper, five species of organic metal chelates as organic electroluminescent materials were synthesized. Their physical properties in relation to organic electroluminescence were investigated in detail. The developments were obtained in the designs of novel materials and device structures and the studies of material structure/optical and electrical properties relationships.(1) In this paper, the optimum synthesis method of (8-hydroxyquinoline) lithium was probed. The synthesized product was confirmed to be Liq·Hq, which was an aggregate of Liq and Hq. Liq had high hygroscopic nature, thereby was unstable. The LUMO, HOMO, and band gap of Liq were confirmed to be -3.24eV, -6.25eV, 3.01eV, respectively. At driving voltage, the device ITO/CuPc/NPD/Liq/A1 could emit blue-green light, not form Liq, but probably from the exciplexes in the interface of NPD/Liq or excimers of Liq. PL spectra of Liq film was located at 470.0nm with FWHM (a full width at half-maximum) of 91.1 nm. The PL spectra of Liq·Hq was located at 453.5nm with FWHM of 69.4nm. Liq·Hq had purer blue fluorescence than Liq. Liq·Hq can be dispersed in PVK and then form nano-scale thin film by spin coat so that more ideal blue electroluminescence should be obtained.(2)A novel complex with two ligands and quadravalent center metal ions, bis(8-hydroxyquinoline)-bis(phenol)zirconium(Zr(OPh)₂q₂) was designed and...