Kaur Gagandeep, Kumar Brijesh, Verma R K, Rai S B
Laser and Spectroscopy Laboratory, Physics Department, Banaras Hindu University, Varanasi 221005, India.
Dalton Trans. 2014 Jul 28;43(28):11014-8. doi: 10.1039/c4dt00880d.
Bismuth nanoparticles (NPs) have been prepared by the pulsed laser ablation technique using the third harmonics of a Nd-YAG laser. UV-absorption and TEM micrographs show Bi NPs of spherical shape with the average particle size ranging from 15 to 20 nm. These NPs were dispersed with Tb(3+) ions and their complex with salicylic acid (Sal) in polyvinyl alcohol to obtain thin films. The influence of Bi NPs on the emissive properties of Tb(3+) ions and the [Tb(Sal)3(phen)] complex has been studied by luminescence spectroscopy using 266 nm and 355 nm as excitation wavelengths. The luminescence intensity of Tb(3+) ions complexed with Sal in the thin polymer films increased significantly as compared to the Tb(3+) ions in the presence of Bi NPs on excitation at 355 nm. However, terbium ions in the case of the [Tb(Sal)3(phen)] complex together with NPs show an intense and extended emission spectrum in the 375-700 nm range for transitions arising from (5)D3 and (5)D4 levels to different (7)F(J) levels on 266 nm excitation. The luminescence enhancement has also been supported by lifetime measurements.
采用钕钇铝石榴石（Nd-YAG）激光的三次谐波，通过脉冲激光烧蚀技术制备了铋纳米颗粒（NPs）。紫外吸收和透射电子显微镜图像显示，铋纳米颗粒呈球形，平均粒径在15至20纳米之间。将这些纳米颗粒与Tb(3+)离子及其与水杨酸（Sal）的配合物分散在聚乙烯醇中，以获得薄膜。利用266纳米和355纳米作为激发波长，通过发光光谱研究了铋纳米颗粒对Tb(3+)离子和[Tb(Sal)3(phen)]配合物发光性能的影响。在355纳米激发下，与存在铋纳米颗粒时的Tb(3+)离子相比，在聚合物薄膜中与Sal络合的Tb(3+)离子的发光强度显著增加。然而，在[Tb(Sal)3(phen)]配合物与纳米颗粒的情况下，铽离子在266纳米激发下，从(5)D3和(5)D4能级到不同(7)F(J)能级的跃迁在375 - 700纳米范围内显示出强烈且扩展的发射光谱。寿命测量也证实了发光增强。
