Luminescence of Mn-activated SrLa2S4

The Th3P4-structure ternary sulfide compound SrLa2S4:0.01Mn2+ is shown to be a photophosphor with a deep crimson emission peaking at 675 nm (1.84 eV) at 300 K. Measurement of the temperature dependence of emission and excitation spectra reveals a systematic shift in band position at 200 K which is interpreted as a second-order transition in the host structure.