Red-Emitting Ga2O3:Eu3+ Powder Derived by Sol-Gel Processing

Ga2O3: Eu3+ Powder was synthesized by sol-gel method with inorganic salt raw materials, and the crystal structure and luminescent properties were investigated. The structures studied by X-ray diffractionmeter showed that single monoclinism could be obtained using this simple processing. Along with the rise of the calcining temperature, the crystallinity of Ga2O3:Eu3+ powder increased and the particle size grew larger. The excitation spectra of the powder showed a wide CTS band and typical excitation from Eu3+ ion, while the emission spectra had a strongest red emission peak at 613 nm. The excitation and emission intensities changed along with the calcining temperature from 650 to 1050 °C and had an optimal calcining temperature. The excitation and emission intensities also changed along with the doping concentration of Eu3+ ion from 0.25% to 4% (atom fraction) and achieve a maximum at a certain concentration which differed for direct Eu3+ excitation or CTS excitation. The electroluminescent spectra indicated the typical red emission from Eu3+ ion.