Design,Synthesis And Properties Of Organic Light Emitting Materials Based On Triphenylamine And Carbazole

As one of future new generation display technology,organic light-emitting display is developing rapidly.Especially the printing display,flexible display and semiconductor lighting are becoming the trend in development of organic light-emitting display with great potential.Solution processing has great foreground by using cross-linkable materials.Blue emitter as weaknesses of emitting materials are always the focus of research.In this paper,two kinds of new cross-linkable hole transport materials have been developed.And the new cross-linking condition was also investigated,the efficiency of cross-linking reaction can be improved obviously by using the new cross-linking technique.Finally,two new blue fluorescence materials were synthesized and studied in detail.The paper consists of three parts:In the first section(Chapter 2),a kind of styrene-type cross-linkable hole transport material SDTF,which is composed of spirofluorene and triphenylamine groups,was designed and synthesized.The properties of the material were systematically studied.The material is stable and easy to be synthesized.The organic light-emitting devices(OLED)and quantum dot light-emitting devices(QLED)were prepared and compared with the commercial polymer material poly-TPD.SDTF showed excellent performance in various devices,which means SDTF is suitable for spin coating and inkjet printing processing in preparation of OLED and QLED.In the second section(Chapter 3),a styrene-type crosslinkable hole transport material,SDOTF,as the core skeleton of spirofluorene and N-phenylcarbazole groups,was designed and synthesized.The thermal stability and solvent resistance are excellent,but the material has a high cross-linking temperature.In order to reduce the cross-linking temperature,we developed a new cross-linking condition which is the interaction of heating and UV lighting.By selecting the appropriate wavelength and power of the UV lamp,under the synergistic effect of light and heating,the crosslinking temperature can be effectively reduced and the crosslinking time can be shortened which is beneficial to improve the production efficiency.In the third part(Chapter 4),two kinds of novel blue fluorescent materials based on oxazole TPA-PPO and CzPh-PPO were designed and synthesized.2-pyridoxazole was used as the core skeleton,and the introduction of different donor groups improves the fluorescence quantum yield of the molecules.Through the preparation of the device,we found that the electroluminescence of two materials are deep blue,while CzPh-PPO based device showed white light with an additional exciplex emission peak at 600 nm for EL spectra.