Effect of the europium doping on the structural and luminescent properties of yttrium aluminum garnet

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 178; no. 4; pp. 248 - 253
• Main Authors: Muresan, L.E., Popovici, E.J., Perhaita, I., Indrea, E., Silipas, T.D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2013
• Subjects: Luminescence; Phosphor; Wet-chemical synthesis; Yttrium aluminum garnet; Yttrium aluminum garnet; Phosphor; Luminescence; Wet-chemical synthesis
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2012.11.018

► YAG phosphors were prepared by an original wet chemical synthesis route. ► Luminescent and structural characteristics of YAG depend on the Eu3+ concentration. ► PL measurements indicate that the europium ions tend to occupy high symmetry sites. ► The main phase (cubic-Y3Al5O12) contains monoclinic-Y4Al2O9 as impurity. ► YAG doped with 3% europium is the most heterogeneous powder.
Europium activated yttrium aluminate (YAG:Eu) phosphors were synthesized using urea by wet chemical synthesis route. The luminescent behavior and the microstructural changes are monitored, depending on the amount of europium. The luminescent spectra of YAG:Eu phosphors possess four major emission bands in the range of 570–700nm with maxima situated at 592nm 598nm, 611nm and 631nm. The intensity ratio between the 611nm band as red component (5D0→7F2) and 592nm band as orange component (5D0→7F1) is discussed, in order to obtain information about the chemical surroundings of the luminescent centers and their symmetry. X-ray diffraction showed that the main crystalline phase of the phosphors is yttrium aluminum garnet Y3Al5O12 with cubic structure. Monoclinic Y4Al2O9 phase was also found as impurity. The effect of the europium content on the microstructural parameters is revealed. The luminescent characteristics depend strongly on the structural purity, activator concentration and incorporation of europium ions in the host lattice. Additional investigations as FT-IR, BET, ICP-OES were performed for a better understanding of the luminescent and structural characteristics of YAG:Eu phosphor.