Characteristics of ZnGa2O4 phosphors synthesized by solution combustion method

Abstract

ZnGa 2 O 4 phosphors were synthesized by both SCM (solution combustion method) and SSRM (solid state reaction method). The characteristics of the both ZnGa 2 O 4 phosphors were investigated by TGA (Thermogravimetric analysis), SEM (scanning electron microscope), BET (Brunauer Emmett Teller), PL (photoluminescence) and XRD (X-ray diffraction). The particle size of SCM phosphor was about one-hundredth of SSRM phosphor. The PL intensity of SCM phosphor was about 1.5 fold higher than that of SSRM phosphor. The SCM phosphor was also tried to be doped with Mn +2 ions. The highest PL peak was observed with Mn +2 ions of 0.003 mole fraction. The peak was shifted from blue (470 nm) to green (513 nm) color. These results might be very useful for high efficiency phosphors for displays such as field emission displays and plasma display panels.

Luminescent Properties of Doped Zinc Aluminate and Zinc Gallate White Light Emitting Nanophosphors Prepared via Sonochemical Method

“…The emission spectra of bulk ZnGa 2 O 4 show a blue emission band around 470 nm in the range of 300 and 600 nm. It originates from the self-activation center of the octahedral GaO 6 group in the spinel lattices and the Ga 3+ ions combine with UV-generated free electrons produced in oxygen vacancies. − It has also been reported that the emission of ZnGa 2 O 4 is influenced by factors such as particle size, shape and crystallinity. − In the case of our ZnGa 2 O 4 nanoparticles, obtained after furnace heating at 475 °C for 4 h on exciting at 356 nm, the emission spectra (Figure ) show a broad emission band in the range of 400 and 600 nm and a maximum emission peak at 469 nm with a shoulder at 437 nm. Similar results have been recently reported for ZnGa 2 O 4 nanocrystals prepared by combining thermolysis of single molecular precursor with the sol−gel method in the presence of a capping agent .…”

“…It originates from the self-activation center of the octahedral GaO 6 group in the spinel lattices and the Ga 3+ ions combine with UV-generated free electrons produced in oxygen vacancies. [33][34][35][36][37][38][39][40][41][42] It has also been reported that the emission of ZnGa 2 O 4 is influenced by factors such as particle size, shape and crystallinity. [33][34][35][36] In the case of our ZnGa 2 O 4 nanoparticles, obtained after furnace heating at 475 °C for 4 h on exciting at 356 nm, the emission spectra (Figure 5) show a broad emission band in the range of 400 and 600 nm and a maximum emission peak at 469 nm with a shoulder at 437 nm.…”

Irregularly Shaped Zn0.6Mn2.4O4 Nanoparticles for Supercapacitors and Nitroaromatics Detection

“…Interstitial zinc defects produce the emission observed at 460 nm . Nanosized ZnCr 2 O 4 , ZnFe 2 O 4 , and ZnGa 2 O 4 also exhibited similar luminescence characteristics. − The presence of Ga in ZnGa 2 O 4 is responsible for the origin of the luminescence properties, but in the case of ZnCr 2 O 4 , ZnFe 2 O 4 , and the present material, the luminescence behavior is due to the presence of Zn.…”

Control of nanostructures by cooling rate in spinel-type manganese oxide ZnMnGaO4

“…ZnGa 2 O 4 phosphor has recently been studied as a potential candidate for field emission displays and plasma display panels. [31][32][33][34][35] In particular, as photocatalysts, ZnGa 2 O 4 nanoparticles have been found to present hydrolytic hydrogen generation activity, and their synthesis has been attempted by various methods, such precipitation and solution combination methods. 36,37) Therefore, the fabrication of nanomaterials containing ZnGa 2 O 4 and control of their dimensions will be of interest.…”