Synthesis and photoluminescence properties of Mn²⁺ doped ZnCN₂ phosphors

Erwan Leysour de Rohello (1) , Francesco Bour (1) , Yan Suffren (2) , Odile Merdrignac-Conanec (1) , Olivier Guillou (2) , François Cheviré (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 INSA Rennes - Institut National des Sciences Appliquées - Rennes

Mn²⁺ doped ZnCN₂ phosphors were synthesized by a solid-state reaction from doped zinc oxalate and carbon nitride under NH₃ atmosphere at 600 °C in only 1 h. The samples were characterized by powder X-ray diffraction, scanning electron microscopy and their diffuse reflectance and luminescence properties were investigated. All pure and well-crystallized Mn²⁺ doped samples exhibit broad orange emission around 585 nm when excited at 270 nm at room temperature corresponding to the ⁴T_1g(⁴G) ⁶A_1g(⁶S) transition. Maximum emission is obtained for Mn²⁺ content of 2 mol% and the emission intensity decreases drastically on the order of 90% between 293 and 385 K. Additionally, the blue luminescence of as-prepared non-doped ZnCN₂ is discussed on the basis of the presence of crystal defects.

Keywords: zinc carbodiimide; carbon nitride; luminescence; phosphor; Mn2+ activator

Domains: Chemical Sciences; Material chemistry

Erwan Leysour de Rohello, Francesco Bour, Yan Suffren, Odile Merdrignac-Conanec, Olivier Guillou, et al.. Synthesis and photoluminescence properties of Mn²⁺ doped ZnCN₂ phosphors. Open Ceramics, 2021, pp.100157. ⟨10.1016/j.oceram.2021.100157⟩. ⟨hal-03276074⟩