Synthesis And Properties Characterization Of Small Molecular Blue-light Emitting Anthracene Derivatives Suitable For Solution Process

We designed and synthesized a series of blue-light emitting anthracene derivatives, in which five compounds have enough high solubility for fabricating OLEDs by solution process. The photophysical properties, thermal properties, electrochemical properties of all compounds and electroluminescence properties of some compounds were investigated detailedly.The main contents of the thesis are summarized as follows:(1) A new soluble small molecular anthracene derivative TBPPA was synthesized, which has high fluorescence quantum efficiency, high thermal stability and reversible oxidation potential. By spin-coating process, we fabricated OLEDs successfully using TBPPA as blue-light emitting or blue host material. The devices maximum brightness and efficiency are 1690cd/m2 and 0.54 cd/A respectively.(2) A series of small molecular anthracene derivatives TBMFA, TBPFA and TBBFA were synthesized, in which TBPFA and TBBFA were investigated in parallel because of their high solubilities in organic solvents. Theoretical calculations on the three-dimensional structures of TBPFA and TBBFA showed that the two compounds both have stable trans and cis two conformations. The alkyl groups have little effect on photophysical properties and oxidation potentials, but have biggish effect to thermal properties. By spin-coating process, we fabricated blue-light emitting OLEDs successfully using TBPFA as emission layer. (3) A series of small molecular anthracene derivatives TBMFPA, TBPFPA and TBBFPA were synthesized, in which TBPFPA and TBBFPA were investigated in parallel for their high solubilities in organic solvents. The single crystal X-ray diffraction of TBPFPA shows the intermolecular interactions are very weak. TBPFPA and TBBFPA both have high fluorescence quantum efficiencies, high thermal stabilities and reversible oxidation potentials. TBPFPA can form high quality amorphous film by spin-coating process. Using TBPFPA as blue-light emitting or blue host materials, the blue-light emitting devices were fabricated by spin-coating process in combination with vacuum deposition process. The devices maximum brightness and efficiency are 4220cd/m2 and 1.05cd/A respectively.(4) A new small molecular anthracene derivative TBDNPA was synthesized and the properties of TBDNPA, TBMFA and TBMFPA were studied in detail. The three compounds all have high fluorescence quantum efficiencies and thermal stabilities. They have approximate HOMO and LUMO energy levels, which can be used as blue-light emitting and blue host materials in OLEDs for their large bandgaps.