Preparation, Characterization And Luminescence Properties Of A Novel1,10-phenanthroline-functionalized Polyimide And Its Lanthanide(Ⅲ) Complexes

In recent years, lanthanide complexes have been considered asattractive luminescent materials in the fields of light-emitting diodes,lasers, and optical fbers because of their fairly long luminescent lifetimeand extremely narrow emission bands from the electronic transitionsbetween the4f energy levels. Moreover, for practical applications inoptical devices, some researchers have incorporated low-molecularlanthanide complexes into various matrixes, such as sol-gel glasses,inorganic-organic hybrid materials, polymers, and liquid crystals. Incomparison with other matrixes, polymers have many advantages of lowcost, processibility and desired mechanical fexibility. In general, polymermatrixes include poly(methylmethacrylate)(PMMA), polystyrene (PS), polyacrylic acid (PAA) and their copolymers. Very recently,developments of new polymer matrix materials, such as polyimide andpolyaryletherketone, which possess excellent thermal, mechanicalproperties, good processibility and high-temperature dimensional stability,are strongly desirable in luminescent material field. Polyimides (PIs) area class of high performance polymers due to their excellent thermal andmechanical properties, high-temperature dimensional stability, chemicalinertness, and good processibility. The main contents and conclusions ofthis paper were as follow:1.1,10-Phenanthroline-functionalized polyimide (CMPI-Phen),which has excellent thermal stability, was successfully obtained as anovel polymer matrix by the nucleophilic substitution reaction betweenchloromethylated polyimide (CMPI) and5-amino-1,10-phenanthroline(NH2-Phen).2. Then, two novel kinds of luminescent materials of1,10-phenanthroline-functionalized polyimide containing Eu(III)complexes, CMPI-Phen-Eu(III) and CMPI-Phen-Eu(TTA)3, which wereprepared through the coordination reaction between CMPI-Phen andEuCl36H2O, or Eu(TTA)32H2O, respectively. Their structures andproperties were characterized by FT-IR,1H NMR, elemental analysis,inductively coupled plasma (ICP), TGA, XRD, luminescencespectrometry, and luminescence decay analysis. Then, the luminescence properties of the two products were investigated and their differenceswere discussed in detail.3. Investigations revealed that both the CMPI-Phen-Eu(III) andCMPI-Phen-Eu(TTA)3display highly efcient red emissions, suggestingtheir potential application as luminescent materials. However, comparedwith CMPI-Phen-Eu(III), CMPI-Phen-Eu(TTA)3exhibits more excellentand stable fuorescence intensity and longer luminescence lifetime(134.30us).4. The Eu contents of CMPI-Phen-Eu(TTA)3and CMPI-Phen-Eu(III)were measured by ICP to be7.00%and5.92%, respectively. TGAdemonstrated that both CMPI-Phen-Eu(III) and CMPI-Phen-Eu(TTA)3have high thermal stability and their5%loss weight temperatures were310and280oC, respectively. Moreover, both CMPI-Phen-Eu(III) andCMPI-Phen-Eu(TTA)3were soluble in polar solvents such as DMF,DMAc, NMP, and DMSO under heating conditions, and could be easilycast into tough thin flms.5. Novel luminescent materials were prepared by couplinglanthanide2-thenoytrifuoroacetonato complexes (Ln=Sm, Tb) toCMPI-Phen. CMPI-Phen-Ln(TTA)3(Ln=Sm, Tb) exhibit high emissionintensity, as well as excellent thermal stability, making them promisingapplication in light-emitting device felds.