Ce 3+ , Tb co-doped multicolour emission phosphors show highly efficient green by energy transfer from to .

We report efficient white upconversion luminescence in Yb(3+)-, Er(3+)- and Tm(3+)-doped monophasic and biphasic Y(2)BaZnO(5) phosphors under 977 nm near-infrared excitation and at low excitation power densities (down to ∼25 mW mm(-2)).

Gd4O2S:Yb:Tm rare-earth upconversion phosphors have been utilised to monitor the redox behaviour of flavin mononucleotide and report on the turnover of a flavo-protein, (pentaerythritol tetranitrate reductase). The presence of two bands separated by over 300 nm in the UCP emission spectra allows ratiometric signalling of these processes with high sensitivity.

169 ANALYTICAL STUDY OF PHOSPHORS FOR RADIATION DOSIMETRY Pankaj Pathak1,Manisha Singh2, Pankaj Kumar Mishra3 1,2,3Department of Applied Physics, Amity School of Engineering & Technology, Amity University, Gwalior (MP) Email:[email protected] Abstract The main aim of the study is to analyse the different luminescence properties of phosphors synthesised by Combustion Synthesis (CS) Techniq...

The legacy of phosphorescence from expensive organometallic compounds has inspired researchers to develop efficient metal-free organic phosphors. Although organic phosphors offer a cheaper alternative, the long-lived triplets of organic phosphors that are primarily consumed by vibrational dissipation need to be adequately suppressed, and this provides an opportunity to design new organic entiti...

Eu2+-doped alkaline-earth silicates are the second most studied group of persistent luminescent inorganic phosphors after aluminates, such as SrAl2O4. Silicates comparable with aluminates in terms chemical stability, high quantum efficiency and large band gap, but offer advantages including better water resistance lower calcination temperature. Their applications range from traditional uses tra...