Sarkar Uttam, Bhattacharya Sagarika
Department of Chemistry, National Institute of Technology Raipur, Chhattisgarh, 492010, India.
Small. 2025 Jul;21(29):e2503419. doi: 10.1002/smll.202503419. Epub 2025 May 7.
Construction of multicolor emissive PMMA composite films are reported using luminescent lanthanide Schiff-Base complexes and Terbium doped Graphene Quantum dots (GQD@Tb) for white light generation. Terbium-doped green emissive Graphene Quantum Dots are synthesized hydrothermally using ortho-phenyldiammine (OPDA), Triethylamine and Tb(NO).6HO and is thoroughly characterized by microscopic and spectroscopic techniques. Isostructural lanthanides (III) complexes [Dy (L)(NO)(dmf)] (1), and [Sm (L)(NO)(dmf)] (2) are isolated from an organic Schiff base ligand, HL, ligand is prepared by 1:1 condensation of salicylaldehyde and 2-(2-Aminoethoxy)ethanol, and are characterized. The photoluminescent data analysis reveals green emission of GQD@Tb, pure blue emissive DyL and red emission of SmL. Additionally, intensified ligand emission attests for the blue emitter-DyL complex while the "antenna effect" is witnessed for red fluorophore SmL. Co-doping of metal complexes and GQD@Tb into the Poly(methyl methylacrylate) [PMMA] polymer improves luminescence intensity due to inhibition of aggregation-induced quenching. By conscientious combination of red-SmL with green-GQD@Tb in a specified concentration, distinct white light is accomplished for the first time with Commission Internationale de I'Éclairage (CIE) values of 0.29, 0.32, very close to the ideal white emitter. The newly developed nano and molecular complex composite of GQD@Tb and SmL-PMMA films are transparent and highly desired materials in optoelectronics, microscopy, and sensing.
报道了使用发光镧系席夫碱配合物和铽掺杂的石墨烯量子点（GQD@Tb）构建多色发光聚甲基丙烯酸甲酯（PMMA）复合薄膜以产生白光。采用邻苯二胺（OPDA）、三乙胺和Tb(NO₃)₃·6H₂O通过水热法合成了铽掺杂的绿色发光石墨烯量子点，并通过显微镜和光谱技术对其进行了全面表征。从有机席夫碱配体HL中分离出同构的镧系（III）配合物[Dy(L)(NO₃)(dmf)]（1）和[Sm(L)(NO₃)(dmf)]（2），该配体由水杨醛和2-(2-氨基乙氧基)乙醇按1:1缩合制备，并对其进行了表征。光致发光数据分析揭示了GQD@Tb的绿色发射、纯蓝色发射的DyL和红色发射的SmL。此外，配体发射增强证明了蓝色发射体-DyL配合物，而红色荧光团SmL则出现了“天线效应”。将金属配合物和GQD@Tb共掺杂到聚（甲基丙烯酸甲酯）[PMMA]聚合物中，由于抑制了聚集诱导猝灭，提高了发光强度。通过将红色的SmL与绿色的GQD@Tb以特定浓度精心组合，首次实现了具有国际照明委员会（CIE）值为0.29、0.32的独特白光，非常接近理想的白色发射体。新开发的GQD@Tb和SmL-PMMA薄膜的纳米和分子复合体系是光电子学、显微镜和传感领域中透明且极具吸引力的材料。
