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Optical properties of low-dimensional PbI2 particles embedded in polyacrylamide matrix

N. PREDA1,* , L. MIHUT1, I. BALTOG1, T. VELULA1, V. TEODORESCU1

Affiliation

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

Abstract

Small particles of PbI2 embedded in transparent polymer matrix have been studied by Raman scattering, UV-VIS absorption spectroscopy, low temperature photoluminescence (PL) and Scanning Electron Microscopy (SEM). The PbI2 crystallites were prepared by two different methods: i) by cooling to the room temperature a boiling saturated aqueous PbI2 solution containing polyacrylamide and ii) by chemical reaction of KI and Pb(NO3)2 in aqueous polyacrylamide solution. In both cases, beside the hexagonal platelets of PbI2 were identified rods whose luminescence and Raman signature is quite different than of PbI2 platelets. Regardless the rods nature, as distinct KPbI3 particles or lead iodide low-dimensional particles embedded in the polymer matrix, their photoluminescence is featured by an intense green emission (550 nm) appearing at low temperature at excitation wavelengths less then 350 nm..

Keywords

Lead iodide crystallites, Polyacrylamide matrix, Raman scattering, Photoluminescence.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

N. PREDA, L. MIHUT, I. BALTOG, T. VELULA, V. TEODORESCU, Optical properties of low-dimensional PbI2 particles embedded in polyacrylamide matrix, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 909-913 (2006)