Europium-Substituted Yttrium Hydrazine Carboxylate Hydrate

33 Europium-Substituted Yttrium Hydrazine Carboxylate Hydrate 

Nowadays, there is a widespread use of compact fluorescent lamps (CFLs) for lighting purposes. CFL technology uses a combination of three phosphor materials red Y203 Eu (60%), green CeMgAlnOi9 Tb (30%), and 

CFL manufacturing. The synthesis of this phosphor by the pyrolysis of hydrazine carboxylate hydrate precursor is described here. 

The complex Yo.99Euo.oi(N2H3COO)3-3H20 decomposes in air at 600 °C to form the corresponding europium-doped yttrium oxide. The decomposition temperature can be reduced, however, by mixing the redox compound with a calculated amount of either ammonium nitrate (1 6) or ammonium perchlorate (1 2.4) and rapidly heating the mixture at 300 °C to obtain Eu -substituted Y2O3 - the red phosphor. 

Fluorescence spectra of Y203 Eu prepared from Y0.99Eu0.01 (N2Fl3C00)3 3H20 show an intense emission at 611 nm (excitation wavelength = 254 nm), which is attributed to the electric dipole transition Do - F2 of Eu +. 

---