Spectroscopic properties of Sm3+ and CdS co-doped in sol-gel silica glass

157-163Sm3+- doped silica glass co-doped with CdS nanoparticles have been prepared by sol-gel method. FTIR spectra of the samples at different annealing temperatures show the gradual removal of hydroxyl group. XRD pattern shows crystalline nature of the silica host along with CdS peak. The optical absorption and fluorescence properties have been investigated using Judd-Ofelt theory. The Judd-Ofelt intensity parameters have been obtained from the absorption spectrum following the trend Ω2 > Ω4 > Ω6 and the large value of Ω2 indicates covalency of the rare earth bonding. Under excitation with 370 nm, photoluminescence peaks have been observed in the green, yellow, orange and red region as a result of radiative relaxation from the 4G5/2 state

Structural and Spectroscopic Properties of Eu3+ions in Alumino-Silicate Glass

The structural, and optical properties of the Eu3+ ion in alumino-silicate 35Al(NO3)3: (65-x) SiO2 glass (x = 0.75, 2.0, and 4.0 mol%) were investigated. X-ray diffraction proved that the present glasses are amorphous. FTIR spectral analysis was used to determine which functional groups were present at specific annealing temperatures. The PL spectra with different Eu3+ concentrations are recorded with excitation wavelength 370 nm have been recorded at room temperature (RT). The PL spectra showed the (5D0→7FJ; J = 0...., 4) transitions of Eu3+ in the prepared glasses. The rise in Eu3+ ions in the host matrix was the explanation for the concentration quenching behaviour that was also seen. To ensure the dominant emission of the present glasses, the PL spectra were characterized using the CIE 1931 chromaticity diagram, and the results were discussed and reported in detail

Structural and Spectroscopic Properties of Eu3+ions in Alumino-Silicate Glass

182-189The structural, and optical properties of the Eu3+ ion in alumino-silicate 35Al(NO3)3: (65-x) SiO2 glass (x = 0.75, 2.0 and 4.0 mol%) were investigated. X-ray diffraction proved that the present glasses are amorphous. FTIR spectral analysis was used to determine which functional groups were present at specific annealing temperatures. The PL spectra with different Eu3+ concentrations are recorded with excitation wavelength 370 nmhave been recorded atroom temperature (RT). The PL spectra showed the (5D0→7FJ; J = 0...., 4) transitions of Eu3+ in the prepared glasses. The rise in Eu3+ ions in the host matrix was the explanation for the concentration quenching behaviour that was also seen. To ensure the dominant emission of the present glasses, the PL spectra were characterized using the CIE 1931 chromaticity diagram, and the results were discussed and reported in detail

First record of a wilt disease of banana plants associated with phytoplasmas in Solomon Islands

Phytoplasmas were detected by nested and real time PCR from wilted cooking banana plants in Solomon Islands close to the border with Papua New Guinea (PNG). These phytoplasmas and two similar phytoplasmas found adjacent in PNG formed a group from the Solomon Island archipelago indistinguishable from each other by sequence analysis. These and similar phytoplasmas from the island of New Guinea were most closely related to phytoplasmas in the16SrXXII-A group