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

Abstract

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-SrCN 2 and β-SrCN 2 in a reproducible and effective manner via the substitution of barium and calcium for strontium. Structural characterizations and optical properties of Eu 2+ doped SrCN 2 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 Eu 2+ 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.

Synthesis and photoluminescence properties of Mn2+ doped Ca1-xSrxCN2 phosphors prepared by a carbon nitride based route

“…Powder samples with general formula Ca1-xMnxCN2 (x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05 and 0.1) were synthesized through solid-state reaction from (doped) calcium carbonate and carbon nitride (C3N4) according to the chemical route described in Ref. [13]. 3 g of undoped or doped calcium carbonate precursors Ca1-xMnxCO3 (x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05 and 0.1) were prepared by co-precipitation method using CaCl2•6H2O (Aldrich, 98%), MnCl2•4H2O (Alfa Aesar, 99%) and Na2CO3 (Acros Organics, 99.95%) as raw materials.…”

“…Hence, the development of a low-cost synthetic route allowing the obtention of highly crystallized doped carbodiimide materials in a reproducible and effective manner with the targeted amount of dopant within the structure is highly desirable. Recently, we reported a simple synthetic route for the preparation of highly crystallized Eu 2+ doped SrCN2 materials in only one hour at 800°C under NH3 atmosphere using directly doped strontium carbonate and carbon nitride as precursors [13]. Therefore, the aim of the present work is to prepare a series of Mn 2+ doped Ca1-xSrxCN2 using the synthetic route developed in our previous study.…”

Synthesis, Luminescence and Energy Transfer Properties of Ce3+/Mn2+ Co-Doped Calcium Carbodiimide Phosphors

“…Over the last decade, inorganic carbodiimide materials with the general formula M x (NCN) y (M = alkali, alkaline-earth, rare-earth or transition metals) have emerged as potential materials for lighting due to their remarkably high thermal and chemical properties [11][12][13][14][15][16][17][18][19][20]. More particularly, the emission properties of rare earth elements involving 5d-4f electronic transitions, i.e., Eu 2+ and Ce 3+ , were recently investigated in various carbodiimides hosts such as SrCN 2 :Eu 2+ (orange red) [14][15][16], BaCN 2 :Eu 2+ (red) [17] or Gd 2 (CN 2 ) 3 :Ce 3+ (yellow) [11] with activation capabilities in the near-UV-blue range. Since the involved 5d orbitals are external, the position of these energy levels and, consequently, the wavelengths of excitation and emission bands strongly depend on the host lattices.…”

“…In order to improve its activation behavior using the energy transfer approach and allow excitation at lower energy, this study focuses on the effect of Ce/Mn co-doping on its excitation and emission properties. To achieve this, CaCN 2 :Ce 3+ is first synthesized using the previously reported carbon nitride route [16] and its luminescence properties are discussed. Then, the impact of various Ce/Mn doping rates on the excitation and emission properties is investigated.…”

Tunable Luminescence and Energy Transfer of Sr3B2O6:Ce3+, Sm3+ Phosphors with Potential Anti-Counterfeiting Applications

“…Lanthanide-activated luminescence materials with stimuli-responsive emission outputs have attracted increasing attention due to their potential applications in optical anti-counterfeiting and information security fields [ 1 , 2 , 3 , 4 , 5 , 6 ]. To pursue the superior performances of feasibility and reliability for applications, there is a necessity for the constant exploration of novel phosphors with an easy trigger and an abundant color evolution.…”