Selectively Modulation Of Optoelectronic Properties And Device Applications Of Phosphine-based Materials

Organic photoelectric functional materials have been widely applied into organoelectronics including organic light-emitting diodes?OLEDs?,organic field effect transistors?OFETs?,organic photovoltaic cells?OPVs?,organic-inorganic hybrid perovskite solar cells,organic lasers,organic biochemical sensor,organic storage and organic anti-counterfeiting and encryption due to their diversifications of structural composition and designability of property modulation.Introducing heteroatoms into the organic?-conjugated systems to optimize and adjust the molecular configuration and condensed structure is one of the effective methods to improve the photoelectric performance of the materials.The incorporation of phosphorus atoms into organic?-conjugation moiety can construct high-performance optoelectronic materials,which not only show selectively modulated optoelectrical properties,but also render new molecular structure and functions including dynamic self-adaptive resonance structure and dual emission complex materials,etc;Moreover,the electronic effects and spatial effects consisting of molecular polarity,excited-state energy levels,electron cloud distribution,intermolecular interactions of the phosphine-based organic functional materials can also be selectively tuned,suggesting the great potential in designing and developing advanced organic semiconductors.This thesis focuses on the design,synthesis and devices application of phosphine-based organic optoelectronic functional materials.The detail researches are as follows:Firstly,a series of aryl phosphine sulfur host materials were constructed.The relationship between its structure and photoelectric performance were evaluated,demonstrate that aryl phosphine sulfur molecules can selectively modulate the electronical performance.The designed four aryl phosphine sulfur host materials achieved a selectively enhanced carrier injection/transport capability and maintains a high triplet energy level?>3.0 e V?and good thermal stability and achieve excellent device performance.The maximum external quantum efficiency,current efficiency and power efficiency of 14.1%,27.8cd A^-1 and 21.4 lm W^-1,respectively.Secondly,the self-adaptivity for dynamic tuning properties of the host material containing multiple N-P=O resonance structures was explored.Due to the existence of multiple resonance mutual transformation structures,dynamic self-regulation of electrical properties can be achieved at a high triplet energy level?2.97 e V?.Benefit from the functional effect of the multiple resonance structures on the balanced charge carrier transmission,when used as the host material for blue and warm white thermally activated delayed fluorescent devices?TADF-OLEDs?with maximum external quantum efficiency of 14.7%and 20.1%,current efficiency of 29.2and 63.7 cd A^-1,and power efficiency of 29.4 and 67.8 lm W^-1,respectively.Finally,based on the unique advantage of the self-adaptive properties of the resonance structure in achieving the modulate of the ground state,excited state energy level and transition composition of the materials,the design of the synergistic resonance afterglow molecule with more resonance channels.The synergistic resonance afterglow molecule achieve the improvement of molecular lifetime or efficiency,its lifetime has reached 443 ms,quantum efficiency has reached 3.05%.