Photoluminescence and structural analysis of terbium doped porous silicon

Abstract

Porous silicon (PS) doped with terbium (Tb 3+ ) has been prepared by impregnation of PS layers with chloride solution of terbium. The dependency of photoluminescence (PL) intensity on the Tb 3+ concentration has been studied. Rutherford Back-scattering Spectrometry (RBS) spectra indicate clearly a total and uniform penetration of rare earth into the PS layers at all different percentages. PL spectra show an increase of the intensity of both Tb 3+ peaks and PS band when the concentration of TbCl 3 solution increases. The PL mechanism is discussed through time-resolved photoluminescence measurements, and in relation with thermal treatment effects. Transmission Electron Microscopy (TEM) technique has also been used to analyse the structure of this nanocomposite material.

Evidence for energy transfer between Eu3+ and Tb3+ in porous silicon matrix

“…1). The same result has been shown with Tb 3+ ions in PS [6,8] behavior of PL intensity of PS with rare earth ions is apparently due to an important excitation transfer for 4C concentration. The excitation transfer process is proved by comparing for the same sample, the PL signals of (Eu 3+ −Tb 3+ )/PS corresponding to 465.8 and 488 nm excitation lines (Fig.…”

“…Some of rare earth complexes have been incorporated into the PS matrix by different methods, and the resulting composites possess rather good thermal stability and mechanical properties [1,2]. When compared with other techniques, the impregnation method [3][4][5][6][7][8] presents some advantages such as the possibility of depositing complex shapes, an easy control of the doping level, rather inexpensive starting materials and simple equipment.…”

Structural, optical and electrical properties of SnO2:Sb:Tb3 /porous silicon devices

“…Then, it seems that Tb 3+ ions occupy some crystallographic sites in the cassiterites, which assure their activation whereas, the activation of Tb 3+ in PS is performed after annealing at 700 • C [18]. We have shown that PL of Tb 3+ in PS is not due to a mechanism of radiative excitation transfer [18,19]. For SnO 2 :Tb 3+ /PS nanocomposites, the mechanism of Tb 3+ emission cannot be also due to radiative excitation transfer since SnO 2 is a transparent material which does not present any emission.…”