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Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity

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Abstract

Ternary materials of europium complex with 2,2,6,6-tetramethyl-3,5-heptanedione (tmhd) ligand and aqua ligand as ancillary ligands have been prepared and characterized for various optoelectronic characteristics. Reactions of hydrated complex [Eu(tmhd)3(H2O)2] proceeded with triphenylphosphine oxide (TPPO) and pyridine-N-oxide (PNO) ancillary ligands were studied to develop novel complexes. The prepared complexes show good thermal stability. A comparative investigation of prepared materials [Eu(tmhd)3(H2O)2], [Eu(tmhd)3(TPPO)2] and [Eu(tmhd)3(PNO)2] was conducted for their luminescent behaviors in order to obtain the role of ancillary ligand in the enhancement of illumination amount generated from europium (Eu3+) ion. Color coordinates of prepared ternary complexes such as [Eu(tmhd)3(H2O)2] with (x = 0.54, y = 0.32), [Eu(tmhd)3(TPPO)2] with (x = 0.56, y = 0.32) and [Eu(tmhd)3(PNO)2] with (x = 0.57, y = 0.33) indicated that these materials exhibited bright red emission in visible region spectrum. The complexes show a proficient energy transport pathway from the ligands to the innermost Eu3+ by means of an ancillary ligand-sensitized luminescence process. Interaction between the metal and ligand results in a distinguished effect on quantum efficiency (η) as well as on Judd–Ofelt intensity factor (Ω2) of the prepared materials.

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Acknowledgement

This work was financially supported by the program from the SERB-DST, New Delhi (No. EMR/2016/006,135).

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Authors and Affiliations

  1. Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India

    Devender Singh, Shri Bhagwan, Anuj Dalal, Kapeesha Nehra, Raman Kumar Saini, Kapoor Singh & Ishwar Singh

  2. Centre de Fisica, Universidade of Minho, Braga, 4710057, Portugal

    Anura Priyajith Simantilleke

  3. Department of Chemistry, DCR University of Science and Technology, Murthal, 131039, India

    Sumit Kumar

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  1. Devender Singh
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Correspondence to Devender Singh.

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Singh, D., Bhagwan, S., Dalal, A. et al. Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity. Rare Met. 40, 2873–2881 (2021). https://doi.org/10.1007/s12598-020-01543-w

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  • DOI: https://doi.org/10.1007/s12598-020-01543-w

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