Luminous terbium and samarium complexes with diacetylmethane and substituted 1,10-phenanthroline derivatives for display applications: Preparation and optoelectronic investigations

• Published in: Journal of luminescence Vol. 249; p. 119032
• Main Authors: Nehra, Kapeesha, Dalal, Anuj, Hooda, Anjli, Kumar, Pawan, Singh, Devender, Kumar, Sumit, Malik, Rajender Singh, Kumar, Parvin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2022
• Subjects: 1,10-Phenanthroline; Color purity; Luminescence; Sensitization effect; Ternary lanthanide complexes; 1,10-Phenanthroline; Sensitization effect; Ternary lanthanide complexes; Luminescence; Color purity
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2022.119032

Octacoordinated ternary heteroleptic lanthanide (Sm and Tb) complexes have been synthesized with diacetylmethane (DAM) and substituted 1,10-phenanthroline auxiliary units. The synthesized complexes were thoroughly characterized through electrochemical, thermal and spectroscopic studies. Photoluminescence emission spectral profiles have demonstrated green and orange-red emission due to the characteristic 5D4 → 7F5 and 4G5/2 → 6H9/2 transitions of Tb3+ and Sm3+ ions, respectively. Intensity ratio points out the asymmetric site around respective trivalent ion which leads to intense luminescence. The energy transfer mechanism has revealed the efficient sensitization of metal ions through organic ligand DAM. Photophysical and optical properties affirm the luminous and conducting behavior of synthesized complexes. These luminous lanthanide complexes could be utilized as emissive material in fabricating display devices.
[Display omitted]
•A series of bright emissive Tb(III) and Sm(III) complexes were prepared with diacetylmethane diketone and heteroaromatic auxiliary ligands.•Emission spectral profiles exhibit intense hypersensitive peaks attributed to 5D4 .→ 7F5 and 4G5/2 → 6H9/2 transitions of Tb3+ and Sm3+ ions, respectively.•Luminescent intensity and color parameters are superior in solid state.•The band gap and branching ratio measurements confirm their potential utility in laser diodes.