Effect Of Aggregation-Induced Emission Featured Material Doping On The Performance Of Organic Bifunctional Device With Electroluminescence And Detection Properties

Organic multifunctional device has drawn considerable interests for their simple fabrication process,light weighting,low cost,renewable,energy saving,and environmental friendly.Among them,the bifunctional device of organic light-emitting device?OLED?and organic photodetectors?OPD?has become the research hotpot due to its achievement of the luminescence and the detection in the same device.It is an urgent problem to improve the luminescence efficiency of OLED-OPD.For this OLED-OPD,the fluorescence aggregation-caused quenching?ACQ?is an important problem to limit the luminescence efficiency of the device.Therefore,this problem of the device is solved by using the material with aggregation-induced emission?AIE?property to improve the luminescence efficiency of the bifunctional device.In this work,a series of OLED-OPDs with active layers using a doping system composed of an AIE featured material of 1,1,2,2-Tetraphenylethene?TPE?as a host and several TADF featured materials of as a dopant are fabricated,then both EL and UV detective properties of OLED-OPDs with various doping concentrations are studied,the effect of aggregation-induced emission on fluorescence aggregation-caused quenching was analyzed.And the effect of different doping concentrations on the performance of bifunctional devices was discussed.The detailed content is as following:?1?A series of bifunctional devices with active layers using a doping system composed of utilizing four different TADF featured materials 2CzPN,4CzIPN,4CzTPN,and DMAC-DPS as the dopant and an AIE featured material of TPE as a host have been fabricated.Among them,the luminescence and detection performance of the bifunctional device with 4CzIPN as a dopant are relatively highest.When the4CzIPN doped into the host,the energy transfer from host to dopant materials is relatively efficient,and the exciton transfer is more balanced.?2?A series of bifunctional devices with active layers using a doping system composed of an AIE featured material of TPE as a host and a TADF featured material of 4Cz IPN as a dopant are fabricated,and then both EL and UV detective properties of bifunctional devices with various doping concentrations of 0 wt%,5 wt%,10 wt%,15 wt%,20 wt%,25 wt%are studied.When the doping concentration reaches 15wt%,an OLED-OPD with a maximum luminance of 2995 cd/m² warm white light and a detectivity of 2.8?10¹¹ Jones is realized,suggesting that the AIE featured of TPE in this concentration has the most effective for the fluorescence ACQ caused by singlet exciton aggregation in the active layer.And the exciton transfer is more balanced in the doping concentration of 15 wt%than in other devices.In summary,a series of bifunctional devices with active layers using a doping system composed of an AIE featured material as a host and several TADF featured materials as dopant are fabricated,then the effect of different several TADF featured materials and the different doped concentrations on the performance of the bifunctional devices are systematically,which paves a way for the fabrication of high performance bifunctional optoelectronic device.