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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。
The organic electroluminescent phosphors (OLEDs) used in this paper are Ir (C6) 2 (acac), a new metal iridium compound, which is composed of the ligands coumarin C6 and acac with metal Iridium formed. Ir (C6) 2 (acac) can be used as electron transport material and luminescent dopant. Comparing the photoluminescence spectra of the coumarin C6 and Ir (C6) 2 (acac) solid materials, it can be seen that the Ir (C6) 2 (acac) significantly inhibits the luminescence quenching effect between the molecules and the molecules of the organic electroluminescent material. The ITO / TPD (N, N’-diphenyl-N, N’-bis (3-methyl- phenyl) -1,1’biphenyl-4,4’diamine) / Ir (C6) 2 (acac) / BAlq CIE (Commission Interationaled ’) can be obtained by reacting Alq3aluminum / Liq (8-hydroxyquinoline lithium) / Al with bis (2-methyl-8-quinolinolato-N1, O8) Eclairage) values of x = 0.43; y = 0.40 orange red light emitting device, the maximum brightness of up to 3 390 cd / m2, the maximum current efficiency of 1.3 cd / A. The same device structure was used to doping Alq3 host with Ir (C6) 2 (acac) to obtain a green light-emitting device with CIE coordinates of x = 0.29; y = 0.58 and a maximum brightness of 8 832 cd / Efficiency is 5.6 cd / A. The mechanism of the luminescence of the device shows that Ir (C6) 2 (acac) non-doped device emits Ir (C6) 2 (acac) triplet phosphorescent light and the device emits orange light. In the single-doped device of Alq3 The fluorescence of Alq3 and Ir (C6) 2 (acac) is dominant, while the presence of a small proportion of Ir (C6) 2 (acac) triplet phosphorescent phosphors exists and the overall luminescence of the device is green.