A novel white emitting organic diode has been simply realized by inserting a doped hole-blocking layer between the hole transporting layer(HTL)and the electron transporting layer(ETL).The structure of this device is I...A novel white emitting organic diode has been simply realized by inserting a doped hole-blocking layer between the hole transporting layer(HTL)and the electron transporting layer(ETL).The structure of this device is ITO/CuPc/NPB/blocking layer:rubrene/Alq/MgAg.Copper phthalocyanine(CuPc)was used as a buffer layer,N,N'-bis-(1-naphthy1)-N,N'-DIPHENYL-1'-biphenyl-4,4'-diamine(NPB)as te HTL,and trimer of complex(Alq) as ETL.Indium tin oxide and MgAg were the anode and cathode,respectively.The emission spectrum of this device covers a wide range of visible region and can be sensitively adjusted by the concentration of rebrene.The white emission with the CIE(Commission International de l'Eclairage)color coordinates x=0.31,y=0.32,a maximum luminance of 8635 cd/m2,and the luminous efficiency 1.39lm/W at the luminance of 100 cd/m2 were obtained in the device with 1.5% rebrene concentration in TPBi.展开更多
Copper phthalocyanine(CuPc)thin film layer was inserted between the anode indium tin oxide and the hole transport layer TPD of an organic thin film electroluminescent device with a double-layered structure.It is found...Copper phthalocyanine(CuPc)thin film layer was inserted between the anode indium tin oxide and the hole transport layer TPD of an organic thin film electroluminescent device with a double-layered structure.It is found that the CuPc layer greatly improves the device stability.The durability of the device with CuPc layer increases about 8 times.The fact that at a constant current density the driving voltage remains unchanged with operation time for the device with CuPc layer means that the barriers of the carriers injection are stable due to the inserted CuPc layer.展开更多
A new method to increase the luminance and quantum efficiency of polymer light emitting diodes with a lower threshold voltage has been reported.The threshold voltagef luminajice and quantum efficiency have been signif...A new method to increase the luminance and quantum efficiency of polymer light emitting diodes with a lower threshold voltage has been reported.The threshold voltagef luminajice and quantum efficiency have been significantly improved by doping certain dopants with a lower highest occupied molecular orbital(HOMO)level into the hole transporting layer.A high performance device has been achieved by addition of the perylene and tri ph enylamin e as a dopant into poly(N-vinylcarbazole).The luminance and quantum efficiency increase by 2-3 times in comparison with the undoped device,reaching 10000cd/m^(2) in luminance and 0.58%in quantum efficiency,while threshold voltage is reduced to one half va/ue.The energy diagram has been obtained by measuring the HOMO levels and band gap values.Based on this,the carriers injection and balance between electrons and holes as well as the action of dopant are discussed.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.59790050 and 69687002,and Shanghai Education Committee.
文摘A novel white emitting organic diode has been simply realized by inserting a doped hole-blocking layer between the hole transporting layer(HTL)and the electron transporting layer(ETL).The structure of this device is ITO/CuPc/NPB/blocking layer:rubrene/Alq/MgAg.Copper phthalocyanine(CuPc)was used as a buffer layer,N,N'-bis-(1-naphthy1)-N,N'-DIPHENYL-1'-biphenyl-4,4'-diamine(NPB)as te HTL,and trimer of complex(Alq) as ETL.Indium tin oxide and MgAg were the anode and cathode,respectively.The emission spectrum of this device covers a wide range of visible region and can be sensitively adjusted by the concentration of rebrene.The white emission with the CIE(Commission International de l'Eclairage)color coordinates x=0.31,y=0.32,a maximum luminance of 8635 cd/m2,and the luminous efficiency 1.39lm/W at the luminance of 100 cd/m2 were obtained in the device with 1.5% rebrene concentration in TPBi.
基金Supported by the National Natural Science Foundation of China under Grant No.19334033.
文摘Copper phthalocyanine(CuPc)thin film layer was inserted between the anode indium tin oxide and the hole transport layer TPD of an organic thin film electroluminescent device with a double-layered structure.It is found that the CuPc layer greatly improves the device stability.The durability of the device with CuPc layer increases about 8 times.The fact that at a constant current density the driving voltage remains unchanged with operation time for the device with CuPc layer means that the barriers of the carriers injection are stable due to the inserted CuPc layer.
基金Supported by the National Natural Science Foundation of China.
文摘A new method to increase the luminance and quantum efficiency of polymer light emitting diodes with a lower threshold voltage has been reported.The threshold voltagef luminajice and quantum efficiency have been significantly improved by doping certain dopants with a lower highest occupied molecular orbital(HOMO)level into the hole transporting layer.A high performance device has been achieved by addition of the perylene and tri ph enylamin e as a dopant into poly(N-vinylcarbazole).The luminance and quantum efficiency increase by 2-3 times in comparison with the undoped device,reaching 10000cd/m^(2) in luminance and 0.58%in quantum efficiency,while threshold voltage is reduced to one half va/ue.The energy diagram has been obtained by measuring the HOMO levels and band gap values.Based on this,the carriers injection and balance between electrons and holes as well as the action of dopant are discussed.
