Effect of Flux and Co-doping on Photoluminescence Properties of ZnSiO:Eu Red Phosphors for Blue LED Excitable White LED Applications.

Eu activated ZnSiO red phosphor synthesized by pyrolysis technique at 1000ºC for one hour is reported. Upon excitation by 394 nm and 464 nm, the phosphor displays a distinct red emission peaking around 614 nm, a characteristic of f-f electronic transitions involving Eu ions.Incorporating alkali metal ions such as Li, Na and K into ZnSiO:Eu phosphor led to a remarkable increase in photoluminescence (PL) intensity.

Intense Red Fluorescence From Surface Traps in BaSO:V, Eu and Its Applications.

BaSO:V synthesized at 1000°C in air exhibits an intense emission band peaking at 495 nm from surface traps assisted by atmospheric oxygen on excitation at 350 nm due to charge transfer from O to V in the (VO) tetrahedral complex. BaSO:Eu synthesized under similar conditions exhibits both Eu (375 nm) and Eu (619 nm) fluorescence. Vanadium codoping quenches the Eu fluorescence but enhances the Eu fluorescence in BaSO:V, Eu due to charge compensation.

Luminescence characteristics and X-ray-induced defects in BaFBr:Eu storage phosphor.

Three different approaches used to synthesize a sensitive BaFBr:Eu X-ray storage photostimulated luminescence (PSL) phosphor at 850°C for 1 h in a reducing atmosphere are reported. The effects of F/Br and Eu concentration on photoluminescence (PL) and PSL sensitivities synthesized by the three approaches were compared. In the first recipe, BaFBr:Eu prepared using a BaF , BaBr and EuF mixture using solid-state diffusion (Recipe I), even in a reducing atmosphere, yielded a low PL and PSL intensity due to oxygen contamination that acted as competing hole traps.

Zinc silicate phosphor: Insights of X-ray induced and temperature enabled luminescence.

The present investigation deals with the effect of calcination temperature on the structural and thermoluminescent (TL) properties of Zn SiO materials. For this study, Zn SiO was prepared via a simple hydrothermal route and calcinated at temperatures from 700°C to 1100°C in an air atmosphere. TL data of all Zn SiO samples showed two peaks at around 240°C and 330°C due to the formation of the luminescence centre during X-ray irradiation.

Development of Optical Biosensor for the Detection of Glutamine in Human Biofluids Using Merocyanine Dye.

Merocyanine dye based fluorescent organic compound has been synthesized for the detection of glutamine. The probe showed remarkable fluorescent intensity with glutamine through ICT (Intermolecular Charge Transfer Mechanism). Hence, it is tested for the detection of glutamine using colorimetric and fluorimetric techniques in physiological and neutral pH (7.