Dalal Anuj, Nehra Kapeesha, Hooda Anjli, Singh Devender, Kumar Sumit, Malik Rajender Singh
Department of Chemistry, Maharshi Dayanand University, Rohtak, India.
Department of Chemistry, DCR University of Science & Technology, Murthal, Haryana, India.
Luminescence. 2022 Aug;37(8):1309-1320. doi: 10.1002/bio.4297. Epub 2022 Jun 9.
Solid ternary europium complexes consisting of fluorinated β-diketone (thenoyltrifluoroacetone, TTFA) and heteroaromatic bidentate auxiliary ligands were synthesized. The luminescence features of the complexes were estimated using various spectral measurements and clearly proved that the Eu ion is efficiently sensitized by ligands by an antenna effect. Photoluminescence excitation spectra have shown that Eu(III) complexes are excited effectively in the ultraviolet (UV) region and the corresponding emission spectra consist of characteristic peaks attributed to the D → F transitions of the europium ion with the strongest emission peak at 611 nm ( D → F ). From photoluminescence (PL) data, decay time, Judd-Ofelt parameters, transition rates, and quantum efficiency of the complexes were also determined. The Commission Internationale de l'éclairage (CIE) colour coordinates indicated the bright red emission of ternary europium complexes. Correlated colour temperature values indicated the utilization of these complexes in display devices. Judd-Ofelt and photophysical parameters were also estimated theoretically using LUMPAC software. Various frontier molecular orbitals and their respective energy were determined. These red emissive europium complexes could be utilized for fabricating solid-state lighting systems.
合成了由氟化β-二酮（噻吩甲酰三氟丙酮，TTFA）和杂芳族双齿辅助配体组成的固态三元铕配合物。通过各种光谱测量对配合物的发光特性进行了评估，结果清楚地证明了Eu离子通过天线效应被配体有效敏化。光致发光激发光谱表明，Eu(III)配合物在紫外（UV）区域能有效激发，相应的发射光谱由归因于铕离子D→F跃迁的特征峰组成，最强发射峰位于611 nm（D→F）。根据光致发光（PL）数据，还测定了配合物的衰减时间、贾德-奥费尔特参数、跃迁速率和量子效率。国际照明委员会（CIE）色坐标表明了三元铕配合物的亮红色发射。相关色温值表明了这些配合物在显示设备中的应用。还使用LUMPAC软件从理论上估算了贾德-奥费尔特和光物理参数。确定了各种前沿分子轨道及其各自的能量。这些红色发光铕配合物可用于制造固态照明系统。
