Abstract
1D, 2D behaving systems of Guanidinium lead halides (Gu2PbX4, X = Br−,I−) were synthesized by simple solution technique. The structural and vibrational properties of the compounds are studied using powder X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy. Uv–Visible absorption studies revealed redshift of absorption edge on substituting bromide with iodide in Gu2PbX4. Photoluminescence (PL), PL excitation, Time resolved PL analysis indicates free exciton emission at 518 nm in Gu2PbI4 and self trapped exciton emission at 517 nm in Gu2PbBr4. The mechanism underlying this emission provides fruitful insights in realizing efficient phosphors for solid state lighting applications.
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