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

The nitridomagnesosilicates Li2Ca2[Mg2Si2N6]:Eu2+ and Li-2(Ca1.88Sr0.12)[Mg2Si2N6]:Eu2+ show narrow-band red emission at 638 and 634 nm, respectively, with an emission bandwidth of 62 nm (similar to 1513 cm(-1)) after excitation in the blue spectral region. Ce3+-doped samples show luminescence in the green spectral range (lambda(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(Ca1.88Sr0.12)[Mg2Si2N6] crystallizes isomorphic to Li2Ca2[Mg2Si2N6]: C2/m [Z = 2, a = 5.5744(2), b = 9.8439(3), c = 6.0170(2) angstrom, beta = 97.2520(10)degrees, 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.