Research On The Application Of Photoelectric Properties Of TDMs And LSPR In Perovskite LEDs

As a new and potential semiconductor material,Organic-inorganic hybrid Perovskite has been widely used in the field of optoelectronic devices recently.Many researchers are trying to improve the performance indicators of Pe LEDs.In this paper,the LSPR effect of Au NPs and two-dimensional material GO to enhance the hole transport ability is studied,the research work of this paper is divided into the following parts:(1)The optimization effect of Pe LEDs modified by GO is studied.The two-dimensional material GO is mixed with PEDOT:PSS as a new hole transport layer,four different sets of volume concentrations are mixed.The structure of the device is ITO/PEDOT:PSS:+GO/CH₃NH₃Pb Br₃/TPBi/Li F/Al,when the volume ratio of PEDOT:PSS and GO is 1:0.2,the performance of the device is optimally optimized,compared with the device without GO doping,the maximum brightness,maximum EQE,and maximum CE is increased by 58.2%,60.4%,and 54.2%.This result proves that the performance of Pe LEDs has been effectively improved by GO.The addition of GO can reduce the energy barrier to improve the hole injection ability,so that the performance of Pe LEDs can be effectively improved.(2)The optimization effect of Pe LEDs modified by Au NPs is studied.Au NPs with different concentration gradient is prepared and spin onto the ITO.The structure of the device is ITO/Au NPs/PEDOT:PSS/CH₃NH₃Pb Br₃/TPBi/Li F/Al,the influence of concentration gradient of Au NPs on the performance of the device is tested and analyzed.It is found that when the concentration of Au NPS is 10%,the performance of the device reaches the optimal state and the maximum brightness of the device reaches 4065cd/m²,compared with the device without Au NPs,the maximum brightness,maximum EQE and maximum CE increased by 50.7%,52.5%and 48.4%.The results show that the LSPR effect of metal nanoparticles can enhance the spontaneous emission of excitons and optimize the device performance.(3)On the basis of the previous work,the optimization effect of Pe LEDs modified by both Au NPs and GO is studied,the structure of the device is ITO/Au NPs/PEDOT:PSS:+GO/CH₃NH₃Pb Br₃/TPBi/Li F/Al,the concentration gradients of different concentration gradients of Au NPs and different volume ratios of PEDOT:PSS mixed GO were set respectively.Compared with the device without Au NPs and GO,the maximum luminance,the maximum EQE,the maximum CE increases by 65.6%,67.2%and 63.3%,respectively.Firstly,the addition of GO improves the hole injection capability of the device;Secondly,the LSPR effect of Au NPs can effectively improve the light extraction efficiency of the device and optimize the device performance.