Monoclinic La1-xCexOHSO4 compounds (0 less than or equal tox less than or e
qual to1) were hydrothermally synthesized from mixed rare earth nitrates an
d thiourea at moderate temperature. The crystals grown are all flake-like i
n morphology and display room temperature ultraviolet luminescence. The mea
n dimension of the crystals turns smaller, and the luminescent intensity tu
rns stronger following the increase of cerium content in the phosphor compo
unds. (C) 2001 Elsevier Science B.V. All rights reserved.