Culeac Ion P, Verlan Victor I, Bordian Olga T, Zubareva Vera E, Iovu Mihail S, Bulhac Ion I, Siminel Nichita A, Siminel Anatolii V, Mihai Geanina, Enachescu Marius
Institute of Applied Physics, MD-2028 Chisinau, Moldova.
Institute of Chemistry, MD-2028 Chisinau, Moldova.
Nanomaterials (Basel). 2022 Aug 14;12(16):2788. doi: 10.3390/nano12162788.
A high-luminescent, blue-light excitable europium(III) coordination complex, [Eu(µ-OCH)(btfa)(NO)(phen)]phen () {btfa = benzoyl trifluoroacetone, phen = 1,10-phenantroline}, has been synthesized and investigated. The complex was characterized by infrared (IR) and (PL) spectroscopy. The PL emission spectra of powder samples registered in a range of 10.7-300 K exhibit characteristic metal-centered luminescence bands, assigned to internal radiative transitions of the Eu ion, D→F and D→F ( = 0-4). The high-resolution spectrum of the transition D→F shows that it consists of two narrow components, separated by 0.96 meV, which indicates the presence in the matrix of two different sites of the Eu ion. The splitting pattern of D→F ( = 0-4) transitions indicates that europium ions are located in a low-symmetry environment. The absolute quantum yield and the sensitization efficiency were determined to be 49.2% and 89.3%, respectively. The complex can be excited with low-cost lasers at around 405 nm and is attractive for potential applications in optoelectronics and biochemistry.
一种高发光、蓝光可激发的铕（III）配位络合物，[Eu(µ - OCH)(btfa)(NO)(phen)]phen（）{btfa = 苯甲酰三氟丙酮，phen = 1,10 - 菲咯啉}，已被合成并研究。该络合物通过红外（IR）和（PL）光谱进行了表征。在10.7 - 300 K范围内记录的粉末样品的PL发射光谱显示出特征性的以金属为中心的发光带，归因于Eu离子的内部辐射跃迁，D→F和D→F（ = 0 - 4）。D→F跃迁的高分辨率光谱表明它由两个窄组分组成，间隔为0.96 meV，这表明在基质中存在Eu离子的两个不同位点。D→F（ = 0 - 4）跃迁的分裂模式表明铕离子位于低对称环境中。绝对量子产率和敏化效率分别测定为49.2%和89.3%。该络合物可用约405 nm的低成本激光器激发，对光电子学和生物化学中的潜在应用具有吸引力。
