Abstract
In lead-activated ZnS single crystals we found at 4.2 K a doublet absorption and excitation band (477 and 495 nm) generating a strong 650 nm emission band. These spectra are ascribed to the transition A1(1S0) ↔ T2(3P1) in Pb2+ on a zinc lattice site. The doublet structure of the excitation band and the temperature dependence of polarization are explained with the Jahn-Teller effect.
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