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作 者:王秀如[1] 吴有智[1] 陈昊瑜[1] 朱文清[1] 蒋雪茵[1] 张志林[1] 孙润光[1] 丁国华[2] 田禾[2]
机构地区:[1]上海大学材料科学与工程学院,上海201800 [2]华东理工大学先进材料与精细化工研究所,上海200237
出 处:《发光学报》2006年第5期695-699,共5页Chinese Journal of Luminescence
摘 要:所研究的有机电致磷光发光器件(OLED)选用了一种新型金属铱的化合物Ir(C6)2(acac),这种金属化合物由配位体香豆素C6和乙酰丙酮(acac)与金属铱化合形成。Ir(C6)2(acac)可同时作为电子传输材料和发光掺杂剂。比较香豆素C6和Ir(C6)2(acac)固体材料的光致发光谱,可见Ir(C6)2(acac)明显抑制了有机电致发光材料分子与分子之间的发光猝灭效应。采用ITO/TPD (N,N′-diphenyl- N,N′-bis (3-methyl-phenyl)-1,1′biphenyl-4,4′diamine)/Ir(C6)2(acac)/BAlq(bis(2-methyl-8-quinolinolato-N1,O8)-(1,1′-biphenyl-4-olato) aluminum)/Alq3aluminum/Liq(8-hydroxyquinoline lithium)/Al结构,可得到CIE (Commission Interationaled′Eclairage)值为x=0.43;y=0.40的橙红色发光器件,最高亮度可达3 390 cd/m2,最大电流效率为1.3 cd/A。采用同样的器件结构以Ir(C6)2(acac)掺杂Alq3主体得到绿色发光器件,发光色的CIE坐标值为x=0.29;y=0.58,最高亮度可达8 832 cd/m2,最大电流效率为5.6 cd/A。器件的发光机理研究表明Ir(C6)2(acac)的非掺杂器件发光以Ir(C6)2(acac)的三线态磷光为主,器件发光为橙色;在Alq3中的单掺杂器件以Alq3和Ir(C6)2(acac)的荧光为主,同时有小比例Ir(C6)2(acac)的三线态磷光成分存在,器件总体发光为绿色。Organic light emitting diodes (OLED) employing an Ir complex with coumarin(C6) and acetylacetone(acac) ligands Ir(C6)2 (acac) are studied. This novel Ir complex can be used both as electron transporting material and light emitting dopant. Comparing the photoluminescence spectra of solid C6 and Ir (C6)2- ( acac), the self-quenching effect of molecules was found to be suppressed obviously. To a device structure of ITO ( indium tin oxide)/TPD ( N, N'-diphenyl- N, N'-bis ( 3-methyl-phenyl ) -1,1' biphenyl-4, 4' diamine) / Ir (C6) 2 ( acac )/BAlq ( bis ( 2-methyl-8-quinolinolato-N1, 08 )- ( 1, 1 '-biphenyl-4-olato ) aluminum )/Alq3 ( tris- (8-hydroxy-quinoline) aluminum) / Liq ( 8-hydroxyquinoline lithium)/Al, an orange color ( Commission Interationale d'Eclairage (CIE) coordinates x = 0.43; y = 0.40) with a max luminance of 3 390 cd/m^2 and an efficiency of 1.3 cd/A (quantum efficiency 1.3% ) are achieved. Using Ir( C6)2 (acac) as dopant and Alq3 as electron transporting host with the same structure, a green color ( CIE coordinates x = 0.29 ; y = 0.58) and a max luminance of 8 832 cd/m^2 and an efficiency of 5. 6 cd/A (quantum efficiency 1. 5%) are obtained. Mechanism of luminescence shows that the orange color luminescence of the device using Ir(C6)2 (acac) as light-emitting layer origins from the triplet emission of It(C6) 2 (acac) dominantly; the green color luminescence of the other device brigins from the fluorescence of Alq3, Ir(C6) 2 (acac), and a little phosphorescence of Ir(C6) 2 (acac).
关 键 词:有机电致磷光 有机电致发光二极管(OLED)
分 类 号:TN383.1[电子电信—物理电子学] TN873.1
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