Combustion synthesis and photoluminescence study of novel red phosphor (Y1−x−y, Gdx)BaB9O16:Eu3+y for display and lighting

• New red phosphors (Y1−x,Gdx)BaB9O16:0.03Eu3+y were prepared by combustion technique.
• Synthesized material were characterized by TG-DTA, powder XRD and FE-SEM and UV, VUV PL.
• Shifting of dominant emission with influence of Gd concentration has been demonstrated.
• The intermediate role of Gd3+ion for energy transfer and optimum concentration for color purity.
• CIE x,y co-ordinates of phosphor have good agreement with NTCL for flat panel, PDP display color.

An efficient and chromatic red emitting borate host phosphors (Y1−x−y,Gdx)BaB9O16:Eu3+y were prepared by a simple route of solution combustion technique for different composition of host (0 ⩽ x ⩽ 0.97, y = 0.03). The synthesis is based up on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate). The heat generated in reaction is utilized for auto combustion of ingredients. Crystal structure and phase formation of product was identified by powder XRD technique while particle morphology was studied by FE-SEM. The photoluminescence (PL) properties under 252 nm ultraviolet (UV) and 147 nm vacuum ultraviolet (VUV) excitation were investigated. It was found that for increasing concentration of Gd dominant emission shift towards longer wavelength and more chromatic side while for optimal doping concentration of Gd3+ ions an intermediate role for energy transfer mechanism from sensitizer to activator is highly efficient which increase transition probability of electric dipole of 5D0 → 7F2 of Eu3+ ion to emits pure and intense red line at 615 nm. This phosphor could be potential candidate for plasma display panel (PDPs) and mercury free lamps.

Shifting of dominant emission from orange–red to pure red in(Y1−x−y, Gdx)BaB9O16:Eu3+y. (x = 0.0, 0.97 and y = 0.03) under 147 nm of VUV excitation.Figure optionsDownload as PowerPoint slide