Research On Optimization And Transparency Of Organic-inorganic Hybrid Perovskite Light-emitting Devices

Organic-inorganic hybrid perovskite has the advantages of both organic and inorganic semiconductor,showing a great application prospects in the field of electroluminescence.But most of the perovskite light-emitting diode(PeLED)devices' luminous efficiency still have a long way to go comparing with the in-depth research of organic light-emitting diodes(OLEDs)and quantum-dot light-emitting diodes(QD-LEDs).At present,the researchers mainly improve the performance of the device by optimizing the carrier injection and transport layers or optimizing the perovskite emission layers.In optoelectronic devices,the role of the electrode is very important,and the application of the new electrode in the perovskite electroluminescent devices is few.In this thesis,we mainly studied the effect of annealing process on CH3NH3PbBr3(MAPbBr3)films and PeLED devices.Moreover,the applications of new electrodes in PeLEDs have also been investigated.The results are as follows:1.The effects of annealing temperature and annealing time on perovskite films and their corresponding devices were investigated.The photoluminescence,crystallinity,morphology and properties of the films were affected by annealing temperature and annealing time.In this work,we found that the optimized annealing condition for the preparation of high performance PeLED devices was 80? annealing for 20 minutes.The maximum brightness of the optimized PeLED device is 13700 cd/m2,and the maximum current efficiency is 8.22 cd/A.2.A transparent PeLED with an organic-inorganic DMD electrode as the transparent top electrode has been proposed for the first time.The transmittance of transparent PeLED device can be adjusted by changing the structure of the top electrode of DMD.The average transmittance of the optimized device in the visible range is 47.21%.The maximum brightness of the light at the bottom and top were 6380(at 7.5V)and 3380 cd/m2(at 7.5V),respectively,and the maximum current efficiency of the bottom and top were 3.50 and 1.47 cd/A,respectively.3.In order to realize the flexible and transparent PeLED,we prepared a new kind of flexible transparent electrode.In the experiment,we introduced LaTiO3 into the DMD structure to prepare the LaTiO3/Ag/LaTiO3(LTALT)transparent conductive film.After optimization of LaTiO3(30 nm)/Ag(12 nm)/LaTiO3(30 nm)film in the visible range,the average transmittance reached to 83.6%in the range from 380 nm to 780 nm,close to 84.7%of ITO.But the LTALT film has a surface resistance of 9.1 ? sq-1,which is 39%lower than ITO.