1
|
Khatri S, Khatri D, Lather V, Singh Y, Kumari P, Khatkar SP, Taxak VB, Kumar R. Exploration of Optical and Radiative Properties of Fluorinated β-keto Carboxylate Tb 3+ Complexes Emanating Cool Green Light. J Fluoresc 2023; 33:1861-1885. [PMID: 36867289 DOI: 10.1007/s10895-023-03177-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 02/11/2023] [Indexed: 03/04/2023]
Abstract
Tb3+ complexes with β-ketocarboxylic acid as main ligand and heterocyclic systems as auxiliary ligand were synthesized and analyzed to assess their prospective relevance as green light emitting material. The complexes were characterized via various spectroscopic techniques and were found to be stable up to ≈ 200 ℃. Photoluminescent (PL) investigation was performed to assess the emissive nature of complexes. Longest luminescence time of decay (1.34 ms) and highest intrinsic quantum efficiency (63.05%) were fetched for complex T5. Color purity of complexes was found to be in range 97.1 - 99.8% which demonstrated the aptness of these complexes in green color display devices. NIR Absorption spectra were employed to evaluate Judd-Ofelt parameters to appraise the luminous performance and environment encircling Tb3+ ions. The JO parameters were found to follow the order: Ω2 > Ω4 > Ω6 and suggested the higher covalence character in complexes. Theoretical branching ratio in the range 65.32 - 72.68%, large stimulated emission cross section and narrow FWHM for 5D4 → 7F5 transition unlocked the relevance of these complexes as a green color laser media. Band gap and Urbach analysis were consummated via enforcing nonlinear curve fit function on absorption data. Two band gaps with values in between 2.02 - 2.93 eV established the prospective use of complexes in photovoltaic devices. Energies of HOMO and LUMO were estimated employing geometrically optimized structures of complexes. Investigation of biological properties accomplished via antioxidant and antimicrobial assays which communicated their applicability in biomedical domain.
Collapse
Affiliation(s)
- Savita Khatri
- University Institute of Engineeering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Deepanita Khatri
- BPS Govt. Medical College for Women, Khanpur, Sonepat, 131305, India
| | - Vaishnavi Lather
- Shri Guru Ram Rai Institute of Medical And Health Sciences, Dehradun, Utterakhand, 248001, India
| | - Yudhvir Singh
- University Institute of Engineeering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Poonam Kumari
- University Institute of Engineeering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - S P Khatkar
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - V B Taxak
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Rajesh Kumar
- University Institute of Engineeering and Technology, Maharshi Dayanand University, Rohtak, 124001, India.
| |
Collapse
|
2
|
Ahlawat P, Bhayana S, Khatri S, Kumari P, Lather V, Hooda P, Taxak VB, Khatkar SP, Kumar R. Study of Judd-Ofelt, Urbach energy and photosensitization process in luminescent Sm(III) complexes with heterocyclic ligands. Photochem Photobiol Sci 2023; 22:395-418. [PMID: 36308631 DOI: 10.1007/s43630-022-00323-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 10/09/2022] [Indexed: 11/26/2022]
Abstract
Six samarium (III) complexes were synthesised by employing the β-ketocarboxylic acid as main ligand and five N-donor systems as ancillary ligands through the environmentally safe liquid-assisted grinding method. Various characterisation techniques were employed to determine the structure of the complexes i.e. NMR, IR, XRD and SEM. Photoluminescent studies were carried out in solid as well as in solution form. In solid and solution form emission spectra show maximum intensity peak at 604 and 602 nm, respectively, assigned to 4G5/2 → 6H7/2 transition which explains orange emission on UV excitation in complexes. CCT, CP, colorimetric parameters and quantum yield (relative and intrinsic) of the synthesized complexes were calculated. With the help of reflectance spectra, band gap and Urbach energy were determined. Lasing parameters were also calculated by employing FWHM values obtained from Gaussian fitting. Energy transfer study revealed the efficacious energy transfer from ligand to metal's emissive level. Further antimicrobial studies revealed higher activity in case of complexes in comparison to ligand.
Collapse
Affiliation(s)
- Pratibha Ahlawat
- University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Seema Bhayana
- University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Savita Khatri
- University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Poonam Kumari
- University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Vaishnavi Lather
- Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, Uttarakhand, 248001, India
| | - Pooja Hooda
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - V B Taxak
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - S P Khatkar
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Rajesh Kumar
- University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, 124001, India.
| |
Collapse
|
3
|
Synthesis and photo-physics of luminescent Sm(III) complexes derived from β-hydroxyketone and heterocyclic ancillary ligands. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
|
4
|
Kumari P, Lather V, Khatri S, Ahlawat P, Sehrawat H, Khatkar SP, Taxak VB, Kumar R. Computational analysis, Urbach energy and Judd-Ofelt parameter of warm Sm 3+ complexes having applications in photovoltaic and display devices. RSC Adv 2022; 12:35827-35848. [PMID: 36545065 PMCID: PMC9753104 DOI: 10.1039/d2ra05796d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 11/27/2022] [Indexed: 12/23/2022] Open
Abstract
In this work, six reddish orange Sm3+ complexes were synthesized using organic ligand (L) and secondary ligands having hetero atoms by a one-step significant liquid-assisted grinding method and were characterized by spectroscopic techniques. The Urbach energy and band gap energy of the complexes were inspected by a linear fit. Using a least square fitting method, the Judd-Ofelt parameter and radiative properties were also determined. Thermal analysis, colorimetric analysis, luminescence decay time and anti-microbial properties of complexes were studied. The luminescence emission spectra of binary and ternary complexes displayed three characteristic peaks at 565, 603 and 650 nm in the powder form and four peaks at 563, 605, 646 and 703 nm in a solution phase due to 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 transitions respectively. The most intense transition in the solid phase (4G5/2 → 6H7/2) is accountable for orange color, and in the solution form, the highly luminescent peak (4G5/2 → 6H9/2) is responsible for reddish orange color of Sm3+ complexes. PXRD and SEM analyses suggested that the complexes possess a nanoparticle grain size with crystalline nature. The decent optoelectrical properties of title complexes in the orangish-red visible domain indicated possible applications in the manufacturing of display and optoelectronic devices.
Collapse
Affiliation(s)
- Poonam Kumari
- University Institute of Engineering and Technology, Maharshi Dayanand University Rohtak 124001 India +91 9034070027
| | - Vaishnavi Lather
- Shri Guru Ram Rai Institute of Medical and Health Sciences Dehradun 248001 India
| | - Savita Khatri
- University Institute of Engineering and Technology, Maharshi Dayanand University Rohtak 124001 India +91 9034070027
| | - Pratibha Ahlawat
- University Institute of Engineering and Technology, Maharshi Dayanand University Rohtak 124001 India +91 9034070027
| | - Harkesh Sehrawat
- University Institute of Engineering and Technology, Maharshi Dayanand University Rohtak 124001 India +91 9034070027
| | - S P Khatkar
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - V B Taxak
- Department of Chemistry, Maharshi Dayanand University Rohtak 124001 India
| | - Rajesh Kumar
- University Institute of Engineering and Technology, Maharshi Dayanand University Rohtak 124001 India +91 9034070027
| |
Collapse
|
5
|
Exploration of photophysical and biological attributes of red light emitting europium (III) chelates with β-keto acid and nitrogen donor ancillary ligands. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04866-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
6
|
Augmentation of photophysical features and Judd-Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2022; 21:2011-2034. [PMID: 35932374 DOI: 10.1007/s43630-022-00275-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/18/2022] [Indexed: 10/15/2022]
Abstract
Six green glowing terbium (III) complexes were fabricated via grinding method utilizing a prime organic ligand (L) and nitrogen donor ancillary ligands. Characterization of synthesized complexes was accomplished through various spectroscopic techniques. The significant thermal stability was determined by thermogravimetric analysis while the energy bandgap and Urbach energy were investigated through diffused reflectance spectra of these complexes. The peak observed at 548 nm in emission spectra is responsible for the virescent color of these complexes. Color purity, decay time, quantum yield, and emission intensities of ternary complexes were significantly improved as compared to binary ones due to the synergistic effect of ancillary ligands. Judd-Ofelt parameters were determined by the NIR absorption spectrum, which claims the asymmetric environment around the terbium (III) ion. CCT values advocate the applicability of these complexes in green light-emitting materials as a cool light source. The biological assignments reveal the significance of these complexes as potent antioxidants and antimicrobial agents. The energy transfer process highlights the enhancement of luminescence in these complexes via the synergic effect of ligands. Our investigation portrays that these complexes can be employed in laser technology, display devices, semiconductors, biological fields, and optoelectronic devices.
Collapse
|