Photoelectric Performance Of Zn Metal Complexes And Phosphorescent Sensitization And Photoelectric Performance Of Ir Metal Complexes

Organic electroluminescence, as new research field, has been a hot subject in flat panel displays and attracted more and more people. The organic luminous materials are the basis and core of the organic electroluminescence. Now, the new and high efficient organic luminous materials and their mechanisms are required as a result of the higher and higher technology for information display. Organic electroluminescence is by itself a subject relate to chemistry, material, physics, electronics etc., and need people to investigate it from material design and synthesis, luminescence process and mechanism, etc. The main points for this thesis are to research the photoelectric performance and phosphorescent sensitization of metal complexes (Zn and Ir), and analyse the effect of experiment parameter on the photoelectric performance. Finally, the significant results are given in the dissertation.Firstly, we researched the luminescence performances of metal complexes FHQZn, BFHQZn, CzHQZn and MCzHQZn. The results showed that these metal complexes were yellow luminescence material with a certain hole-transporting characteristics. Base on above research, we finally fabricated the OLEDs with the four metal complexes materials. Among of them, the OLED with the structure of ITO/2T-NATA (22 nm)/CzHQZn (18 nm)/NPBX (5 nm)/ADN (27 nm)/BCP (8 nm)/Alq3(20 nm)/LiF (0.5 nm)/Al had the best luminescence performance with the CzHQZn material. The results showed the WOLED with a maximum luminous efficiency of 1.46 cd/A (at 10 V) and a maximum luminance of 6416 cd/m2 (at 13 V) was achieved. The CIE coordinates of device were from (0.30,0.31) for 10 V to (0.28,0.30) for 13 V, and they were stable on the voltages. In addition, we synthesized a new metal compoud of Zn(C19H12N4)2(C7H4O6S)H2O. The results showed the 3 d supramolecular structure was formed by hydrogen bonding by the unit cells, and theπ-πinteraction was strengthened the crystal structure.Secondly, we researched the phosphorescent sensitization of the metal complexes Ir(ppy)3. And we mainly discussed the effect of phosphorescent sensitization on the luminescence performance of the OLEDs. At the first, the phosphorescent sensitizer of Ir(ppy)3 sensitized rubrene, ADN and CzHQZn materials were researched. The results showed the phosphorescent sensitizer of Ir(ppy)3 could improved the luminous efficiency and luminance of the luminescence materials. The energy of Ir(ppy)3, which from the host, had been transferred to acceptor by the Forster mechanism. Then it would be excitated and radiation deactivation in order to emit the fluorescence. Thirdly, we researched the photoelectric performance of the metal complex Ir(piq)3. In the system, the carriers transport via Ir(piq)3 dopant molecules in the emitting layer with single host, while, via both dopant and host molecules when their energy levels were well aligned. Conditions for reduction of driving voltage and enhanced efficiency of red PHOLED were obtained with mixed host structure. In the end, we fabricated the OLEDs by the physical blending method. The device had a corresponding color change from blue through white change to yellow with the increase in the proportion of rubrene blend, and the brightness and current efficiency of the devices also showed regular changes with the voltage. The method can be simplified the preparation technology of the OLEDs.OLEDs have some disadvantages, such as complex production process, shorter life, lower rate, etc. We find that OLEDs based on the Zn metal complexes have good photoelectric performance by the experiments. And Zn metal complexes we used are not only the hole-transporting materials but also the luminescence materials. These multi-functional organic electroluminescent materials have been attracted more and more people. We also attempt to synthesis the Zn metal complex in the dissertation. In addition, we use the phosphorescent sensitization of the Ir metal complex and different methods, such as the mixed host method and physical blending method to further improve the photoelectric performance of the OLEDs. They are the significance of the dissertation.