Luminescence of the Narrow-Band Red Emitting Nitridomagnesosilicate Li2(Ca1–xSrx)2[Mg2Si2N6]:Eu2+ (x = 0–0.06)

The nitridomagnesosilicates Li 2 Ca 2 [Mg 2 Si 2 N 6 ]:Eu 2+ and Li 2 (Ca 1.88 Sr 0.12 )[Mg 2 Si 2 N 6 ]:Eu 2+ show narrow-band red emission at 638 and 634 nm, respectively, with an emission bandwidth of 62 nm (∼1513 cm –1 ) after excitation in the blue spectral region. Ce 3+ -doped samples show luminescence in the green spectral range (λ em = 540 nm). The compounds were synthesized via solid-state metathesis reaction in Li melts. Refinement of single-crystal X-ray diffraction data revealed that Li 2 (Ca 1.88 Sr 0.12 )[Mg 2 Si 2 N 6 ] crystallizes isomorphic to Li 2 Ca 2 [Mg 2 Si 2 N 6 ]: C 2/ m [ Z = 2, a = 5.5744(2), b = 9.8439(3), c = 6.0170(2) Å, β = 97.2520(10)°, R 1 = 0.021, wR 2 = 0.047]. Crystal composition was checked by EDS and ICP-OES measurements and luminescence properties are compared to state of the art narrow-band red emitting luminophors. On the basis of its narrow-band emission, application of the novel red luminophor in high CRI white pcLEDs is promising.