Optical and structural properties of Eu2+-doped (Sr1-xBax)(2)SiO4 phosphors

Europium (Eu2+)-doped alkaline earth orthosilicates (Sr1-xBax)(2)SiO4:Eu2+, are studied as a phosphor for color-tunable white-light-emitting diode. With an increase of Ba ions in (Sr1-xBax)(2)SiO4:Eu2+, the lattice constants increase, and the emission bands shift to higher energy in a systematic way. This blueshift behavior can be clarified by crystal field strength. Also, the lattice vibration energies from Raman spectra decrease with an increase of Ba ions in (Sr1-xBax)(2)SiO4:Eu2+. The emission-quenching temperature dependence of the lattice vibration frequency is investigated in terms of a well-known configurational coordinate diagram. (c) 2005 The Electrochemical Society.