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Efficient photoluminescent complexes of 400-1800 nm wavelength emitting lanthanides containing organic sensitizers for optoelectronic devices

机译:包含有机光敏剂的,发射波长为400-1800 nm的镧系元素的高效光致发光复合物,用于光电器件

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摘要

An in situ solution processed reaction of a bidentate O,O'-chelating anionic hexafluoroacetylacetone (Hhfaa) and a bidentate N,N'-chelating 2,2 '-bipyridine ligand with LnCl(3)center dot 6H(2)O in the presence of a base afforded the UV-sensitised 400-1800 nm wavelength emitting lanthanide complexes, [Pr(hfaa)(3)(bpy)(2)] and [Ln(hfaa)(3)(bpy)](Ln = Tb, Dy, Tm and Lu). The single-crystal analysis indicates that the Pr complex is ten-coordinate with a distorted bicapped square antiprism while the Dy complex is eight-coordinate with a distorted square antiprism geometry, and the bpy units, in the complexes, are involved in pi-pi stacking interactions and hydrogen bonding, respectively. The assembly of the hfaa(-) (a low vibrational frequency ligand) and bpy ligand makes an efficient protective coordination environment (PrO6N4 or DyO6N2) around the Pr (red emission), Tb (green emission), Dy (yellow emission) and Tm (blue emission) ions which leads to high quantum yields and longer emission lifetimes. The quantum efficiency of the complexes is enhanced in the solid state. Furthermore, these volatile and luminescent complexes were used as emitting layers to fabricate red-, green- and yellow-light emitting devices and their electroluminescence performances were investigated. The best devices with the structure ITO/CuPc (20 nm)/[Pr(hfaa)(3)(bpy)(2)] or [Tb(hfaa)(3)(bpy)] or [Dy(hfaa)(3)(bpy)] (80 nm)/BCP (25 nm)/AlQ (30 nm)/LiF (1 nm)/Al (200 nm) exhibit a maximum brightness of 183, 1765 and 532 cd m(-2) with a current efficiency of 0.58, 3.6 and 0.76 cd A(-1), respectively, which indicates an improved EL performance over the devices based on Pr, Tb and Dy complexes in the literature.
机译:原位O,O'-螯合阴离子六氟乙酰丙酮(Hhfaa)和双齿N,N'-螯合2,2'-联吡啶配体与LnCl(3)中心点6H(2)O的原位溶液处理反应碱的存在提供了紫外敏感的400-1800 nm波长发射镧系元素络合物,[Pr(hfaa)(3)(bpy)(2)]和[Ln(hfaa)(3)(bpy)](Ln = Tb ,Dy,Tm和Lu)。单晶分析表明,Pr配合物是十坐标的,具有扭曲的双峰方形反棱镜,而Dy配合物是八坐标的,具有扭曲的正方形反棱镜几何形状,并且配合物中的bpy单元参与pi-pi堆积相互作用和氢键。 hfaa(-)(低振动频率配体)和bpy配体的组装在Pr(红色发射),Tb(绿色发射),Dy(黄色发射)和Tm周围形成了有效的保护配位环境(PrO6N4或DyO6N2)。 (蓝色发射)离子,导致高量子产率和更长的发射寿命。在固态下,配合物的量子效率提高。此外,将这些挥发性和发光配合物用作发光层以制造红色,绿色和黄色发光器件,并研究了它们的电致发光性能。结构为ITO / CuPc(20 nm)/ [Pr(hfaa)(3)(bpy)(2)]或[Tb(hfaa)(3)(bpy)]或[Dy(hfaa)(3)的最佳器件)(bpy)](80 nm)/ BCP(25 nm)/ AlQ(30 nm)/ LiF(1 nm)/ Al(200 nm)的最大亮度为183、1765和532 cd m(-2),电流效率分别为0.58、3.6和0.76 cd A(-1),这表明与文献中基于Pr,Tb和Dy配合物的器件相比,EL性能有所提高。

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