Synthesis and characterization of ZnxMg1 − xGa2O4:Co2+ fabricated by low-temperature burning method

✍ Scribed by Hailiang Lü; Jiyong Du; Yi Ma; Wenling Ma; Junqi Liu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 420 KB
• Volume: 203
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2010.06.001

✦ Synopsis

Burning method Zn

x Mg 1 -x Ga 2 O 4 :Co 2+ Nanocrystal A series of Zn x Mg 1 -x Ga 2 O 4 :Co 2+ spinels (x = 0, 0.25, 0.5, 0.75, and 1.0) was successfully produced through lowtemperature burning method by using Mg(NO 3 ) 2 •4H 2 O, Zn(NO 3 ) 2 •6H 2 O, Ga(NO 3 ) 3 •6H 2 O, CO(NH 2 ) 2 , NH 4 NO 3 , and Co(NO 3 ) 2 •6H 2 O as raw materials. The product was characterized by X-ray diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The product was not merely a simple mixture of MgGa 2 O 4 and ZnGa 2 O 4 ; rather, it formed a solid solution. The lattice constant of Zn x Mg 1 -x Ga 2 O 4 :Co 2+ (0≤ x ≤ 1.0) crystals has a good linear relationship with the doping density, x. The synthesized products have high crystallinities with neat arrays. Based on an analysis of the form and position of the emission spectrum, the strong emission peak around the visible region (670 nm) can be attributed to the energy level transition [ 4 T 1 ( 4 P) → 4 A 2 ( 4 F)] of Co 2+ in the tetrahedron. The weak emission peak in the near-infrared region can be attributed to the energy level transition [ 4 T 1 ( 4 P) → 4 T 2 ( 4 F)] of Co 2+ in the tetrahedron.