A cyclometalated greenish-yellow emitter 2,3-diphenylimidazo[1,2-a]pyridine iridium（Ill） complex is successfully synthesized and used to fabricate phosphorescent organic light-emitting diodes. The optimized device e...A cyclometalated greenish-yellow emitter 2,3-diphenylimidazo[1,2-a]pyridine iridium（Ill） complex is successfully synthesized and used to fabricate phosphorescent organic light-emitting diodes. The optimized device exhibits a greenish-yellow emission with the peak at 523nm and a strong shoulder at 557nm, corresponding to Commission Internationale de l＇Eclairage coordinates of （0.38, 0.68）. The full width at half maximum of the device is 93 nm, which is broader than the fac-tris（2-phenylpyridine）iridium [Ir（ppy）3] based reference device of 78 nm. Meanwhile, a maximum current efficiency of 62.6 cd/A （47.51m/W） is obtained. This result is higher than a maximum current efficiency of 54.8 cd/A （431m/W） of the Ir（ppy）a based device. The results indicate that this new iridium complex may have potential applications in fabricating high color rendering index white organic light emitting diodes.展开更多
White organic light-emitting devices(WOLEDs) were fabricated by using a highly blue fluorescent dye of 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl(DPVBi) and a red fluorescent dye of 5H-benzo[ij] quinolizi...White organic light-emitting devices(WOLEDs) were fabricated by using a highly blue fluorescent dye of 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl(DPVBi) and a red fluorescent dye of 5H-benzo[ij] quinolizin-9-yl) ethenyl]-4H-pyran-4-ylidene] propane-dinitrile(DCM2), together with a green fluorescent dye of 10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1 H,5 H,11 H-(1)-benzopyroyran-o(6,7-8-i,j) quinolizin-11-one(C545 T).The multilayer WOLEDs does not involve the doping process.The structure of the device is indium tin oxide(ITO)/4,4',4''-tris{N,-(3-methylphenyl)-N-phenylamin}triphenylamine(m-MTDATA)(55 nm)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biph-enyl-4,4'-diamine(NPB)(10 nm)/DPVBi(8 nm)/C545 T(x nm)/DPVBi(5 nm)/DCM2(y nm)/tris-(8-hydroxyquinoline) aluminum(Alq3)(60 nm)/LiF(1 nm)/Al, where the DPVBi is introduced as a spacer.By changing the thicknesses of dual ultrathin layers of C545 T and DCM2, the WOLED is obtained.When x=y=0.05, the Commission Internationale de 1'Eclairage(CIE) coordinates of the device change from(0.262 6, 0.351 4) at 4 V to(0.214 7, 0.269 3) at 12 V that are well in the white region.Its maximum luminance is 41400 cd/m^2 at 13 V, and the maximum current efficiency and the maximum power efficiency are 7.95 cd/A at 6 V and 5.37 lm/W at 5 V, respectively.展开更多
基金Project supported by the National Natural Science Foundation of China(60877027)the Knowledge Innovation Project of Chinese Academy of Sciences(KJCX2-YW-M11)~~
文摘A cyclometalated greenish-yellow emitter 2,3-diphenylimidazo[1,2-a]pyridine iridium（Ill） complex is successfully synthesized and used to fabricate phosphorescent organic light-emitting diodes. The optimized device exhibits a greenish-yellow emission with the peak at 523nm and a strong shoulder at 557nm, corresponding to Commission Internationale de l＇Eclairage coordinates of （0.38, 0.68）. The full width at half maximum of the device is 93 nm, which is broader than the fac-tris（2-phenylpyridine）iridium [Ir（ppy）3] based reference device of 78 nm. Meanwhile, a maximum current efficiency of 62.6 cd/A （47.51m/W） is obtained. This result is higher than a maximum current efficiency of 54.8 cd/A （431m/W） of the Ir（ppy）a based device. The results indicate that this new iridium complex may have potential applications in fabricating high color rendering index white organic light emitting diodes.
基金supported by the Major Project of Science and Technology Office of Fujian Province of China(No.2014H0042)the Natural Science Foundation of Fujian Province of China(No.2015J01664)
文摘White organic light-emitting devices(WOLEDs) were fabricated by using a highly blue fluorescent dye of 4,4'-bis(2,2'-diphenyl vinyl)-1,1'-biphenyl(DPVBi) and a red fluorescent dye of 5H-benzo[ij] quinolizin-9-yl) ethenyl]-4H-pyran-4-ylidene] propane-dinitrile(DCM2), together with a green fluorescent dye of 10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1 H,5 H,11 H-(1)-benzopyroyran-o(6,7-8-i,j) quinolizin-11-one(C545 T).The multilayer WOLEDs does not involve the doping process.The structure of the device is indium tin oxide(ITO)/4,4',4''-tris{N,-(3-methylphenyl)-N-phenylamin}triphenylamine(m-MTDATA)(55 nm)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biph-enyl-4,4'-diamine(NPB)(10 nm)/DPVBi(8 nm)/C545 T(x nm)/DPVBi(5 nm)/DCM2(y nm)/tris-(8-hydroxyquinoline) aluminum(Alq3)(60 nm)/LiF(1 nm)/Al, where the DPVBi is introduced as a spacer.By changing the thicknesses of dual ultrathin layers of C545 T and DCM2, the WOLED is obtained.When x=y=0.05, the Commission Internationale de 1'Eclairage(CIE) coordinates of the device change from(0.262 6, 0.351 4) at 4 V to(0.214 7, 0.269 3) at 12 V that are well in the white region.Its maximum luminance is 41400 cd/m^2 at 13 V, and the maximum current efficiency and the maximum power efficiency are 7.95 cd/A at 6 V and 5.37 lm/W at 5 V, respectively.
