Raman and photoluminescence studies on intercalated lead iodide with pyridine and iodine

Intercalated Pb12 compounds were prepared by exposing crystalline films and crystalline powders of lead iodide to pyridine or iodine vapor at room temperature. Correlated studies of optical absorption, Raman scattering and low temperature photoluminescence (PL) reveal different properties in compari...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2008-02, Vol.10 (2), p.319-322
Main Authors: Preda, N, Mihut, L, Baibarac, M, Husanu, M, Bucur, C, Baltog, I
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Intercalated Pb12 compounds were prepared by exposing crystalline films and crystalline powders of lead iodide to pyridine or iodine vapor at room temperature. Correlated studies of optical absorption, Raman scattering and low temperature photoluminescence (PL) reveal different properties in comparison with those of pure crystalline Pb12 powder. Depending of the nature of intercalated molecules (organic or inorganic) the basic semiconducting properties of Pb12 are dramatically modified. The main signature of iodine intercalated Pb12 consists in a luminescence band peaking at 2.24 eV appearing at 77 K under 350 nm excitation light. In the case of pyridine intercalated Pb12 a new intense band at about 3.3 eV in the absorption spectrum is observed. The the PL spectra of pyridine intercalated Pb12 at 77 K change substantially when the excitation wavelength. The Raman spectra confirm the presence of pyridine between the Pb12 layers.
ISSN:1454-4164