Intense Visible Photoluminescence from C₄₆H₂₂N₈O₄KM (M = Co, Fe, Pb) Derivatives Thin Films

María Elena Sánchez, Juan Carlos Alonso, Jerry Nathan Reider

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DOI: 10.4236/ampc.2011.13010                

Abstract

Strong visible photoluminescence (PL) at room temperature is obtained from thermal-evaporated thin solid films of Metallophthalocyanine (M = Co, Fe, Pb) and double potassium salt from 1,8 dihydroxyan-thraquinone. The PL of all the investigated samples is observed with the naked eye in a bright background. The deconvolution of the normalized PL spectra shows that each PL spectrum is composed of four emission bands which peak at approximately the same energies of 2.1, 2.2 and 2.4 eV and whose intensities and widths depend upon the structure of the complexes. FTIR and ellipsometry are employed to investigate the structural differences among the films. The optical absorption of the films is also investigated to evaluate the changes in the electronic structure of these metal organic compounds, with respect to other metalphtalocya-nines thin films. Our results suggest that the visible PL comes from radiative transitions between energy lev-els associated to the double potassium salt coordination to the metallic ion in the phthalocyanine.

Keywords

Thin Films, Optical Properties, Photoluminescence

Conflicts of Interest

The authors declare no conflicts of interest.

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