Effect of cationic substitutions on the photoluminescence properties of Eu²⁺ doped SrCN₂ prepared by a facile C₃N₄ based synthetic approach

Erwan Leysour de Rohello (1) , Yan Suffren (1) , Odile Merdrignac-Conanec (1) , Olivier Guillou (1) , François Cheviré (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

An alternative general approach to synthesize carbodiimide materials using carbon nitride as precursor is proposed. This new facile synthetic route was illustrated by the preparation of single-phases α-SrCN₂ and β-SrCN₂ in a reproducible and effective manner via the substitution of barium and calcium for strontium. Structural characterizations and optical properties of Eu²⁺ doped SrCN₂ polymorphs were investigated on the bases of high-resolution X-ray powder diffraction and photoluminescence analyses to evaluate the potential of such systems as red phosphors. All Eu²⁺ doped samples exhibit intense red emission in the 620-630 nm range when excited at 440 nm at 77 K with little impact of the crystal lattice on emission wavelength. However, calcium and barium substitutions for strontium strongly impact the emission intensity and the emission width respectively and all doped samples have their emission intensity reduced by 50 % around 80-90 K and totally quenched at RT.

Mots clés: carbodiimide; alkaline-earth; luminescence; phosphor; carbon nitride; Alkaline-earth; Carbodiimide; Carbon nitride; Luminescence; Phosphor

Domaines: Chimie; Matériaux

Erwan Leysour de Rohello, Yan Suffren, Odile Merdrignac-Conanec, Olivier Guillou, François Cheviré. Effect of cationic substitutions on the photoluminescence properties of Eu²⁺ doped SrCN₂ prepared by a facile C₃N₄ based synthetic approach. Journal of the European Ceramic Society, 2020, 40 (16), pp.2316-2321. ⟨10.1016/j.jeurceramsoc.2019.12.002⟩. ⟨hal-02394684v2⟩