Bismuth induced enhanced green emission from terbium ions and their complex in thin films

作者：Kaur Gagandeep; Kumar Brijesh; Verma R K; Rai S B^*

来源：Dalton Transactions, 2014, 43(28): 11014-11018.

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 Tb3+ 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 Tb3+ 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 Tb3+ ions complexed with Sal in the thin polymer films increased significantly as compared to the Tb3+ 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 D-5(3) and D-5(4) levels to different F-7(J) levels on 266 nm excitation. The luminescence enhancement has also been supported by lifetime measurements.

• 出版日期2014