ChemInform Abstract: Electroluminescence Cells Based on the Lamellar Solid Hydrogen Uranyl Phosphate

ChemInform Abstract

, HUO₂PO₄·4 H₂O (HUP), are constructed and the intensity of the ac-induced electroluminescence (EL) is measured as a function of sample thickness, ac frequency, and applied voltage. EL from HUP as well as from its fully substituted derivatives NaUO₂PO₄·3 H₂O (NaUP), Mg(UO₂PO₄)₂·9 H₂O (MgUP) and PyUO2PO4 (pyHUP) can be achieved by a large ac electric field (1.5-3.0 kV, 0.2-4 kHz) in the presence of nitrogen gas. The HUP serves both as a phosphor being excited by the nitrogen plasma, and as an electrode. Impedance measurements show that both the dielectric constant and the ionic conductivity of the solids studied decrease in the order HUP > NaUP > MgUP > pyHUP. A model is presented that describes the dependence of the EL intensity on the cell parameters.