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Photoluminescence and electroluminescence of deep red iridium(III) complexes with 2,3-diphenylquinoxaline derivatives and 1,3,4-oxadiazole derivatives ligands

机译:深红色铱(III)与2,3-二苯基喹喔啉衍生物和1,3,4-恶二唑衍生物配体的配合物的光致发光和电致发光

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Four iridium(III) complexes (Ir1 to Ir4) containing 2,3-diphenylquinoxaline derivatives with or without fluoro-substituted on different positions (L1: 2,3-diphenylquinoxaline; L2: 6,7-difluoro-2,3-diphenylquinoxaline; L3: 2,3-bis(4-fluorophenyl)quinoxaline; L4: 6,7-difluoro-2,3-bis(4-fluorophenyl)quinoxaline) as main ligands and 2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenol (HPOP) as ancillary ligand were synthesized and investigated. All the complexes emit deep red photoluminescence (PL) (Ir1: λmax: 645 nm; Ir2: λmax: 650 nm; Ir3: λmax: 634 nm; Ir4: λmax: 639 nm). Moreover, the electron mobility of the complexes Ir3 and Ir4 is higher than that of the electron transport material Alq3 (tris-(8-hydroxyquinoline)aluminium), which is beneficial for their performances in organic light-emitting diodes (OLEDs). The OLEDs with single- or double-emitting layers (EML) were fabricated using Ir3 or Ir4 as the emitter. The double-EML device using Ir4 with the structure of ITO (indium-tin-oxide)/MoO3 (molybdenum oxide, 5 nm)/TAPC (di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane, 30 nm)/TcTa (4,4′,4′′-tris(carbazol-9-yl) triphenylamine): Ir4 (2 wt%, 10 nm)/26DCzPPy (2,6-bis(3-(carbazol-9-yl)phenyl)pyridine): Ir4 (2 wt%, 10 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 40 nm)/LiF (1 nm)/Al (100 nm) displays good electroluminescence (EL) performances with maximum luminance, current efficiency, power efficiency and external quantum efficiency of up to 20?676 cd m?2, 14.0 cd A?1, 12.0 lm W?1 and 17.8%, respectively, and the efficiency roll-off ratio is mild. The results suggest that the number and position of fluoro-substituents can affect photophysical, electrochemical and electroluminescent properties of the Ir(III) complexes, which are potential deep red phosphorescent materials for specific OLED applications.
机译:四个包含(2,3-二苯基喹喔啉)衍生物的铱( III )配合物(Ir1至Ir4),在不同位置上有或没有被氟取代(L1:2,3-二苯基喹喔啉; L2:6,7-二氟-2,3-二苯基喹喔啉; L3:2,3-双(4-氟苯基)喹喔啉; L4:6,7-二氟-2,3-双(4-氟苯基)喹喔啉)和2-(5-合成并研究了苯基-1,3,4-恶二唑-2-基)苯酚(HPOP)作为辅助配体。所有复合物均发出深红色光致发光(PL)(Ir1:λ max :645 nm; Ir2:λ max :650 nm; Ir3:λ max :634 nm; Ir4: λ max :639 nm)。而且,配合物Ir3和Ir4的电子迁移率高于电子传输材料Alq 3 (三-(8-羟基喹啉)铝)的电子迁移率。在有机发光二极管(OLED)中的性能。使用Ir3或Ir4作为发射极制造具有单或双发射层(EML)的OLED。使用Ir4的双EMC器件,结构为ITO(氧化铟锡)/ MoO 3 (氧化钼,5 nm)/ TAPC(di-​​ [4 -( N N -二糖基-氨基)-苯基]环己烷,30 nm)/ TcTa(4,4',4''-tris(咔唑-9- yl)三苯胺):Ir4(2 wt%,10 nm)/ 26DCzPPy(2,6-双(3-(咔唑-9-基)苯基)吡啶):Ir4(2 wt%,10 nm)/ TmPyPB(1 ,3,5-三( m -吡啶-3-基-苯基)苯,40 nm)/ LiF(1 nm)/ Al(100 nm)具有良好的电致发光(EL)性能,最大亮度,电流效率,功率效率和外部量子效率高达20?676 cd m ?2 ,14.0 cd A ?1 ,12.0 lm W ?1 和17.8%,效率降落率适中。结果表明,氟取代基的数量和位置会影响Ir( III )配合物的光物理,电化学和电致发光性能,这些配合物是用于特定OLED应用的潜在深红色磷光材料。

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