Abstract
Luminescence properties of hydrogen-bonded ferroelectrics PbHPO 4 (LHP) are studied in the temperature range of 10–320 K. Broad luminescence bands with a Gaussian line shape are observed at 2.8 and 3.9 eV at low temperatures. These luminescence bands are found to be stimulated efficiently at the exciton band region. These results strongly suggest that the luminescence bands are intrinsic in origin and due to the annihilation of self-trapped excitons. This is in agreement with the small value of the steepness parameter ( σ 0=0.78) of the Urbach tail. The decay–time measurement indicates that the 2.8-eV luminescence consists of fast ( τ f=6 ns) and slow ( τ s=70 ns) decay components. The effect of interaction of self-trapped excitons with the surrounding proton system below and above T C is discussed.
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