Blasse et al. in 1968 [17] and were intensively studied as phosphors
for color-tunable white light emitting diodes (LEDs). The
luminescence of divalent europium doped ortho-silicates is attributed
to the [Xe]4f6
5d1
–[Xe]4f7 transition and is strongly influenced
by the local coordination in the host lattice [18