Department of Applied Physics, G H Raisoni Academy of Engineering & Technology, Nagpur, India.
Department of Applied Physics, Laxminarayan Institute of Technology, Nagpur, India.
Luminescence. 2021 Dec;36(8):1878-1884. doi: 10.1002/bio.3997. Epub 2020 Dec 29.
An attempt has been made to synthesize orange-red light-emitting rare earth-doped polymer matrices Eu Sm (TTA) tppo (Eu = europium, Sm = samarium, TTA = thenoyltrifluoroacetone, tppo = triphenylphosphine oxide) hybrid organic complex by solution technique. Blended thin films were made by molecularly doping the complex in polymethylmethacrylate (PMMA) and polystyrene (PS) polymers at different weight percentages (5%, 10%). These films were solvated in basic and acidic media to explore the effect of solvent on its luminescence properties. UV-visible absorption spectra of these solvated films portray two peaks corresponding to π→π* and n→π* optical transitions in the range 240-275 nm and 370-390 nm in basic medium. Energy band gap of these thin films in basic medium was found between 3.16 eV to 3.20 eV and 3.12 eV to 3.22 eV in acidic medium. Photoluminescence spectra of all films in dichloromethane showed an intense peak at 614 nm, whereas in formic acid, the same were found at 475 nm, which fell in the orange-red and blue region of the visible spectrum, respectively. CIE coordinates of these solvated films in various solvents and at different weight percentages revealed tunable orange-red to blue light emission with change in polarity of the solvent. Therefore the synthesized complexes blended in the polymers can be shaped into flexible films for fabrication of organic light-emitting diodes (OLEDs) with consistent results, proving their prospect as colour tunable light emissive materials for OLED devices, lasers, displays, and solid-state lighting.
已经尝试通过溶液技术合成橙红色发光稀土掺杂聚合物基质 Eu Sm（TTA）tppo（Eu = 铕，Sm = 钐，TTA = 三氟乙酰丙酮，tppo = 三苯基氧化膦）杂化有机配合物。通过将配合物以不同的重量百分比（5％，10％）分子掺杂到聚甲基丙烯酸甲酯（PMMA）和聚苯乙烯（PS）聚合物中，制备了混合薄膜。将这些薄膜溶解在碱性和酸性介质中，以研究溶剂对其发光性能的影响。这些溶剂化薄膜的紫外-可见吸收光谱在碱性介质中描绘了两个对应于π→π和 n→π光跃迁的峰，范围为 240-275nm 和 370-390nm。在碱性介质中，这些薄膜的能带隙在 3.16eV 到 3.20eV 之间，在酸性介质中在 3.12eV 到 3.22eV 之间。所有薄膜在二氯甲烷中的光致发光光谱在 614nm 处显示出一个强峰，而在甲酸中，在 475nm 处发现了相同的峰，分别落在可见光谱的橙红色和蓝色区域。在各种溶剂和不同重量百分比下这些溶剂化薄膜的 CIE 坐标表明，随着溶剂极性的变化，可以实现可调谐的橙红色到蓝色发光。因此，合成的配合物与聚合物混合可以形成柔性薄膜，用于制造具有一致结果的有机发光二极管（OLED），证明它们作为可调谐颜色发光材料在 OLED 器件、激光器、显示器和固态照明中的前景。
