Optoelectronic properties of the oxadiazole-functionalized iridium complex-doped polymer light-emitting devices （PLEDs） are demonstrated with two different polymeric host matrices at the dopant concentrations 1-8%. ...Optoelectronic properties of the oxadiazole-functionalized iridium complex-doped polymer light-emitting devices （PLEDs） are demonstrated with two different polymeric host matrices at the dopant concentrations 1-8%. The devices using a blend of poly（9,9-dioctylttuorene）（PFO） and 2-（4-biphenyl）-5-（4-tert-butylphenyl）-1,3,4-oxadiazole （PBD） as a host matrix exhibited a maximum luminance efficiency of 11.3 cd/A at 17. 6 mA/cm^2. In contrast, the devices using a blend of poly（N-vinylcarbazole） （PVK） and PBD as a host matrix reveal only a peak luminance efficiency of 6.Scd/A at 4.1 mA/cm^2. The significantly enhanced electrophosphorescent emissions are observed in the devices with the PFO-PBD blend as a host matrix. This indicates that choice of polymers in the host matrices is crucial to achieve highly efficient phosphorescent dye-doped PLEDs.展开更多
A type of oxadiazole-functionalized iridium complex is newly employed as red phosphor emitter in polymer lightemitting devices （PLEDs） using a blend of poly （9,9-dioctylfluorene）（PFO） and 2-tert-butylphenyl-5-bi...A type of oxadiazole-functionalized iridium complex is newly employed as red phosphor emitter in polymer lightemitting devices （PLEDs） using a blend of poly （9,9-dioctylfluorene）（PFO） and 2-tert-butylphenyl-5-biphenyl- 1,3,4-oxadiazole （PBD） as a host matrix. The devices show bright red electrophosphorescence with dominant peaks at about 593nm and shoulders at about 642nm. The highest luminance efficiency of 3.3 cd/A at 9.3 V and maximum luminance of 2912cd/m^2 at 14.0V are achieved in the devices. At current density of 100mA/cm^2, the devices still exhibit luminance efficiency of 2.2 cd/A and luminance of 2300 cd/m^2. This indicates that the oxadiazole-functionalized iridium complexes have improved optoelectronic properties in the devices at high current density.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 20272014 and 50473046, and the Science Foundation of the Ministry of Education of China under Grant No 204097, and the 0utstanding Youth Foundation of Hunan Province under Grant No 04J J1002, and the Science Foundation of the Department of Education of Hunan Province under Grant No 03A049.
文摘Optoelectronic properties of the oxadiazole-functionalized iridium complex-doped polymer light-emitting devices （PLEDs） are demonstrated with two different polymeric host matrices at the dopant concentrations 1-8%. The devices using a blend of poly（9,9-dioctylttuorene）（PFO） and 2-（4-biphenyl）-5-（4-tert-butylphenyl）-1,3,4-oxadiazole （PBD） as a host matrix exhibited a maximum luminance efficiency of 11.3 cd/A at 17. 6 mA/cm^2. In contrast, the devices using a blend of poly（N-vinylcarbazole） （PVK） and PBD as a host matrix reveal only a peak luminance efficiency of 6.Scd/A at 4.1 mA/cm^2. The significantly enhanced electrophosphorescent emissions are observed in the devices with the PFO-PBD blend as a host matrix. This indicates that choice of polymers in the host matrices is crucial to achieve highly efficient phosphorescent dye-doped PLEDs.
基金Supported by the National Natural Science Foundation of China under Grant No 20272014, and the Science Foundation of the Ministry of Education of China under Grant No 204097, and the 0utstanding Youth Foundation of Hunan Province under Grant No 04JJ1002, and the Science Foundation of the Department of Education of Hunan Province under Grant No 03A049.
文摘A type of oxadiazole-functionalized iridium complex is newly employed as red phosphor emitter in polymer lightemitting devices （PLEDs） using a blend of poly （9,9-dioctylfluorene）（PFO） and 2-tert-butylphenyl-5-biphenyl- 1,3,4-oxadiazole （PBD） as a host matrix. The devices show bright red electrophosphorescence with dominant peaks at about 593nm and shoulders at about 642nm. The highest luminance efficiency of 3.3 cd/A at 9.3 V and maximum luminance of 2912cd/m^2 at 14.0V are achieved in the devices. At current density of 100mA/cm^2, the devices still exhibit luminance efficiency of 2.2 cd/A and luminance of 2300 cd/m^2. This indicates that the oxadiazole-functionalized iridium complexes have improved optoelectronic properties in the devices at high current density.
