Luminescence of defect centres in Hg2Cl2

Bryknar, Z.; Peka, Pavel; Konṋáková, A.; Král, J.; Schulz, Hans-Joachim

doi:10.1080/10420159508227266

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Luminescence of defect centres in Hg₂Cl₂

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Peka, Pavel
Fritz Haber Institute, Max Planck Society;

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Schulz, Hans-Joachim
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Bryknar, Z., Peka, P., Konṋáková, A., Král, J., & Schulz, H.-J. (1995). Luminescence of defect centres in Hg₂Cl₂. Radiation Effects and Defects in Solids, 134(1-4), 447-451. doi:10.1080/10420159508227266.

Cite as: https://hdl.handle.net/21.11116/0000-0009-563E-2

Abstract

Luminescence in Hg₂Cl₂, crystals excited with UV light is investigated in the spectral region 0.8–2.25 eV. Measurements are performed on as-grown samples and on samples previously exposed to UV light at RT. Six emission bands are found which depend on the concentration of the photochemical entities produced by irradiation of the crystals at RT. It is concluded that infra-red (IR) luminescence of Hg₂Cl₂ originates from crystal defects. The observed emission bands are tentatively attributed to the emission of (HgCI_xBr_3−x)⁻ and (HgCl_xBr_4−x)²⁻ complexes formed with residual Br impurities. Centres responsible for IR Hg₂Cl₂ emissions are excited: (i) via excitons of Hg₂Cl₂, (ii) via excited states of isolated Hg₂Br₂ molecules, and (iii) resonantly through the excitation bands of defect centres.