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

N. PREDA1, L. MIHUT1, M. BAIBARAC1, M. HUSANU1,* , C. BUCUR1, I. BALTOG1

Affiliation

  1. National Institute of Materials Physics, Lab. of Optics and Spectroscopy, P. O. Box MG-7, RO-77125, Bucharest, Romania

Abstract

Intercalated PbI2 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 PbI2 powder. Depending of the nature of intercalated molecules (organic or inorganic) the basic semiconducting properties of PbI2 are dramatically modified. The main signature of iodine intercalated PbI2 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 PbI2 a new intense band at about 3.3 eV in the absorption spectrum is observed. The the PL spectra of pyridine intercalated PbI2 at 77 K change substantially when the excitation wavelength. The Raman spectra confirm the presence of pyridine between the PbI2 layers..

Keywords

Lead iodide, Pyridine, Iodine, Raman scattering, Photoluminescence.

Submitted at: Sept. 25, 2007
Accepted at: Feb. 18, 2008

Citation

N. PREDA, L. MIHUT, M. BAIBARAC, M. HUSANU, C. BUCUR, I. BALTOG, Raman and photoluminescence studies on intercalated lead iodide with pyridine and iodine, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 2, pp. 319-322 (2008)