Khatri Savita, Khatri Deepanita, Lather Vaishnavi, Singh Yudhvir, Kumari Poonam, Khatkar S P, Taxak V B, Kumar Rajesh
University Institute of Engineeering and Technology, Maharshi Dayanand University, Rohtak, 124001, India.
BPS Govt. Medical College for Women, Khanpur, Sonepat, 131305, India.
J Fluoresc. 2023 Sep;33(5):1861-1885. doi: 10.1007/s10895-023-03177-4. Epub 2023 Mar 3.
Tb 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 Tb ions. The JO parameters were found to follow the order: Ω > Ω > Ω 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 D → F 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.
合成并分析了以β - 酮羧酸为主要配体、杂环体系为辅助配体的Tb配合物，以评估其作为绿色发光材料的潜在相关性。通过各种光谱技术对这些配合物进行了表征，发现它们在高达约200℃时是稳定的。进行了光致发光（PL）研究以评估配合物的发光性质。配合物T5的最长发光衰减时间为1.34毫秒，最高本征量子效率为63.05%。发现配合物的色纯度在97.1 - 99.8%范围内，这表明这些配合物适用于绿色显示器件。利用近红外吸收光谱来评估Judd - Ofelt参数，以评价Tb离子周围的发光性能和环境。发现JO参数遵循Ω₂ > Ω₄ > Ω₆的顺序，并表明配合物中具有更高的共价性。理论分支比在65.32 - 72.68%范围内，D → F跃迁的大受激发射截面和窄半高宽表明这些配合物作为绿色激光介质的相关性。通过对吸收数据应用非线性曲线拟合函数完成了带隙和Urbach分析。两个带隙值在2.02 - 2.93 eV之间，这表明配合物在光电器件中的潜在应用。利用配合物的几何优化结构估计了HOMO和LUMO的能量。通过抗氧化和抗菌试验完成了生物学性质的研究，这表明它们在生物医学领域的适用性。
