Abstract
Luminescence properties of hydrogen-bonded ferroelectrics PbHPO 4 (LHP) have been studied in the temperature range of 10 to 320 v K. A broad luminescence band with a large Stokes shift is observed at 2.8 v eV, stimulated efficiently at the first exciton band region. This result strongly suggests that the luminescence band is intrinsic in origin and it is due to annihilation of self-trapped excitons. This is in agreement with the small value of the steepness parameter ( 0 =0.78) of the Urbach tail. The time-resolved photoluminescence measurement indicates that the 2.8 v eV luminescence consists of composite bands which decay with lifetimes of 6 v ns, 600 v ns and 60 v µs.
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