Research On Light Radiation Performance Of Insertion Layer Based On Multi-Component OLED

Organic Light-emitting Device(OLED),as the core of the third-generation display technology,has become one of the most cutting-edge scientific research fields due to its stable performance,energy saving,environmental protection,and simple manufacturing process.They have broad application prospects in flat panel displays and solid-state lighting,so they have attracted much attention.The thesis studied the intercalation of light-emitting diodes,designed a series of high-efficiency light-emitting OLED devices,and explored the internal light-emitting mechanism of the devices,and obtained a batch of high-brightness,high-efficiency,and adjustable emission spectrum OLED devices.The research includes the following aspects:(1)Research on solution-processed OLED devices based on blended host:The blending host-light-emitting system composed of TADF material 2Cz DPS,PVK,and TAPC replaces high-efficiency organic light-emitting materials to achieve high-efficiency light emission and demonstrate the potential of high-efficiency organic light-emitting diodes(OLED).At the same time,the solution method is adopted to simplify the manufacturing process,and this structure greatly improves the insertion injection and transmission efficiency.By dispersing 2Cz DPS and PVK,TAPC in a ratio of 6:3:1,a novel hybrid main structure can be applied to five luminescent materials:FIrpic,Ir(ppy)2acac,IR-DDP,4CZIPN,IR-LMN,and the current efficiency reaches28.06 cd A^-1,37.20 cd A^-1,35.2 cd A^-1,17.2 cd A^-1 and 16.1 cd A^-1,to achieve high-efficiency multi-color OLEDs such as blue,green,yellow-green,yellow and red.These results confirm that2Cz DPS,PVK,and TAPC as a blending host material have the potential in color OLEDs.(2)Research on the optical radiation characteristics of the device based on different intercalation layers:Three different electron transport layers are used to control the performance of TADF OLEDs.The light-emitting devices based on different insertion layers were explored,and BCP and TPBi,TCTA and TPBi,BCP and TmPyPB were combined in different thicknesses to further change the carrier mobility.By adjusting the thickness of BCP,TPBI,and TmPyPB,the electron transmission ability is changed,and then the exciton recombination area is changed,and the OLED light-emitting performance is improved.At the same time,different emission spectra of DMAC-TRZ are obtained.When the electron transport layer is TPBI,the emission peak covers the range from 500 nm to 520 nm,and the performance does not change much as the thickness increases.When the electron transport layer is BCP,the emission peak ranges from 500 nm to 516nm.But when BCP is used as the insertion layer,when the electron transport layer is TPBi,the emission peak is blue shifted to 504 nm;when the insertion layer is TmPyPB,the emission peak is508 nm.The combination of BCP and TmPyPB can make the emission peak 500 nm;when the insertion layer is For TCTA and electron transport layer TPBi,when the thickness of the double-layer structure is 5 nm and 40 nm,respectively,the charge recombination area can be further changed,and the emission peak can be blue-shifted to 484 nm.Further control of the charge recombination area can further blue shift the emission spectrum of the device.These results confirm that different insertion layers can change the charge recombination area,adjust the emission spectrum of the device,and then change the optical radiation performance of the device.(3)Based on the adjustment of the exciton blocking layer to the EL spectral characteristics of the device:explore the influence of different exciton blocking materials on the emission spectrum.Take AND,CBP as exciton blocking layer,and combine with four kinds of electron transport materials B3PYMPM,DPEPO,TPBi and TmPyPB to control the emission spectrum of the device.When AND is the exciton blocking layer,the emission peaks of the device combined with the electron transport materials B3PYMPM,TPBi,and TmPyPB are blue emission at 477,484,and 488nm,respectively;when CBP is the blocking layer,it is combined with the electron transport materials B3PYMPM,When DPEPO,TPBi and TmPyPB are combined,the emission peak is blue-shifted from 488 nm to 436 nm,achieving a wide range of 52 nm blue emission spectrum control.In addition,it is found that under different voltages,the charge transport ability can be affected,and the light emission spectrum of the device can be changed,and the emission spectrum can be shifted to different degrees.