Synthesis of novel europium complexes and their photoluminescence properties

• Published in: Journal of rare earths 2012, Vol.30 (1), p.17-20
• Main Author: 史林芳 李艳伟 曹华茹 关莹 马永纯
• Format: Article
• Language: English
• Subjects: Absorption spectra; Band spectra; Bands; complex; earths; Emission; Emission analysis; Eu(III) complex; Europium; Eu（III）; ligand; luminescent; luminescent property; Photoluminescence; property; rare; Rare earth metals; rare earths; second; second ligand
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60630-8

Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2（NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato） were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at ~610 nm,a characteristic Eu3＋ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu（III） ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2（0.03） was two times higher than that of 1（0.01） which should be at-tributed to the effect of the ethyl substituting in ENIP.