Study Of Organic Light-emitting Devices Based On Optimized White Organic Single Crystal

OLED has the advantages of self-luminous,surface-emitting,and can be prepared on flexible substrates.With the continuous progress of OLED materials and device fabrication processes,the cost of OLED is gradually decreasing,and OLED are also entering thousands of households in various product forms.However,due to the low carrier mobility and high impurity content of the organic semiconductor material film,the efficiency and stability of the OLED are greatly limited.Organic single crystals are different from amorphous organic thin films.Their molecular arrangement is orderly,so fewer impurities and defects make it have much higher carrier mobility and stability than amorphous organic thin films.It has broad application prospects in OLED,field effect transistor and photodetector.The research on organic single crystal OLED began in 1963.Pope et al.realized electroluminescence in anthracene single crystal for the first time.Since then,new organic single crystal materials and new fabrication strategy have been applied in organic single crystal OLED.The three primary colors of red,green and blue and white light emission of organic single crystals have been realized.However,organic single crystal OLED are still restricted by problems such as low light-emitting brightness,unsatisfactory light-emitting efficiency,and small light-emitting area,which limits the application of organic single crystal OLED.The main reasons for the analysis: First,it is difficult to grow organic single crystals in large areas;second,most organic single crystals are P-or N-type materials,and unbalanced carrier transport limits the performance of organic single crystal OLED;third,the thickness of organic single crystals is thicker than thin film materials,so the carrier's transmission distance is longer,causing energy loss.This paper aims to improve the performance of white-light organic single crystal OLED by optimizing the luminescence and transmission characteristics of white-light organic single crystal through doping strategy.The P-type BSB-Me and the N-type BTPB are used as the host material of the white light crystal,and tetracene and pentacene are doped in it to adjust the emission spectrum.The organic single crystal has a relatively balanced transport properties of electrons and holes while achieving white light emission.