With N-(5-phenyl-1,3,4-oxadiazol-2-yl)-benzamide (HL1) as the first ligand, three new luminescent europium complexes Eu2Na2(L1)6(OH)2·2C2H5OH·2CHCl3 (1), Eu(L1)3(phen) (phen = 1,10-phenanthroline) (2) and Eu2Na2(L1)6(L2)2(OH)2·8CHCl3 [L2 = 2,5-bis(2-pyridyl)-1,3,4-oxadiazole] (3) have been prepared and structurally characterized. Each ligand L1 coordinates with a Eu3+ ion through a carbonyl oxygen atom and oxadiazol nitrogen atom, the coordination geometry at europium is a distorted square antiprism. Complexes 1 and 3 have centrosymmetric dimeric structural features with OH− as the bridging ligand, while 2 is mononuclear with phen as the neutral ligand. All these complexes show efficient red emissions typical of Eu3+ ions at room temperature, the overall quantum yields of complexes 1, 2 and 3 were 0.15, 0.37 and 0.23, respectively. Using Eu(L1)3(phen) as the emitting material, an electroluminescent device with the structure ITO/TPD (30 nm)/Eu(L1)3(phen): TPD (1 : 3, 50 nm)/AlQ (30 nm)/Mg0.9Ag0.1/Ag was fabricated. The device emits sharp red light originating from europium complex, demonstrating that Eu(L1)3(phen) is a promising red emitter with good electron-transporting property.
以N-(5-苯基-1,3,4-恶二唑-2-基)-苯甲酰胺(HL1)为第一
配体,制备了3种新型发光
铕配合物Eu2Na2(L1)6(OH)2·2C2H5OH·2CHCl3(1 )、Eu(L1)3(phen)(phen = 1,10-
菲咯啉)(2) 和 Eu2Na2(L1)6(
L2)2(OH)2·8CHCl3 [
L2 = 2,5-双(2-
吡啶基) )-1,3,4-恶二唑](3)已被制备并进行了结构表征。每个
配体L1通过羰基氧原子和恶二唑氮原子与Eu3+离子配位,
铕的配位几何形状是扭曲的方形反棱镜。配合物1和3具有以OH−为桥联
配体的中心对称二聚体结构特征,而配合物2为单核,以phen为中性
配体。所有这些配合物在室温下均表现出Eu3+离子典型的高效红光发射,配合物1、2和3的总量子产率分别为0.15、0.37和0.23。以Eu(L1)3(phen)为
发光材料,制备了结构为ITO/
TPD (30 nm)/Eu(L1)3(phen):
TPD (1 : 3, 50 nm)/AlQ (30 nm)的电致发光器件。 nm)/Mg0.9Ag0.1/Ag 被制造。该器件发出源自
铕络合物的尖锐红光,表明Eu(L1)3(phen)是一种有前途的红光发射体,具有良好的电子传输性能。