BaP₆ N₁₀ NH:Eu²⁺ as a Case Study-An Imidonitridophosphate Showing Luminescence

Barium imidonitridophosphate BaP₆ N₁₀ NH was synthesized at 5 GPa and 1000 °C with a high-pressure high-temperature approach using the multianvil technique. Ba(N₃ )₂ , P₃ N₅ and NH₄ Cl were used as starting materials, applying a combination of azide and mineralizer routes. The structure elucidation of BaP₆ N₁₀ NH (P6₃ , a=7.5633(11), c=8.512(2) Å, Z=2) was performed by a combination of transmission electron microscopy and single-crystal diffraction with microfocused synchrotron radiation. Phase purity was verified by Rietveld refinement. ¹ H and ³¹ P solid-state NMR and FTIR spectroscopy are consistent with the structure model. The chemical composition was confirmed by energy-dispersive X-ray spectroscopy and CHNS analyses. Eu²⁺ -doped samples of BaP₆ N₁₀ NH show blue emission upon excitation with UV to blue light (λ_em =460 nm, fwhm=2423 cm^-1 ) representing unprecedented Eu²⁺ -luminescence of an imidonitride.