Optical and Structural Properties of Eu[sup 2+]-doped (Sr[sub 1−x]Ba[sub x])[sub 2]SiO[sub 4] phosphors

Europium -doped alkaline earth orthosilicates , are studied as a phosphor for color-tunable white-light-emitting diode. With an increase of Ba ions in , 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 . The emission-quenching temperature dependence of the lattice vibration frequency is investigated in terms of a well-known configurational coordinate diagram.