Photoluminescence of mercurous halides
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Add time:08/19/2019 Source:sciencedirect.com
Mercurous halides show strong orange luminescence at 77°K when excited at energies above the fundamental absorption edge. At room temperature this luminescence is strong only in the chloride and bromide. Spectral features, including band maxima and half widths of both excitation and emission spectra are also temperature dependent. At 77°K a strong green luminescence was observed from the Hg2Cl2. Both Hg2F2 and Hg2I2 exhibited weak green emission, while no luminescence was observed from Hg2Br2 in this spectral region. The common orange luminescence is tentatively attributed to structural defects unique to mercurous salts, while the green emission is ascribed to an unspecified impurity center.
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