dc.contributor.author |
Mahesh, SK |
|
dc.contributor.author |
Rao, PP |
|
dc.date.accessioned |
2021-05-14T06:43:50Z |
|
dc.date.available |
2021-05-14T06:43:50Z |
|
dc.date.issued |
2020-12 |
|
dc.identifier.citation |
Journal of Materials Science: Materials in Electronics;31(23):20847-20857 |
en_US |
dc.identifier.uri |
https://doi.org/10.1007/s10854-020-04598-8 |
|
dc.identifier.uri |
http://hdl.handle.net/123456789/3762 |
|
dc.description.abstract |
Dependence on charge transfer (CT) band and emission properties are investigated in Eu3+ doped quaternary pyrochlore-type oxides,Ca(RE)1−x(M)NbO7 (RE = Y, Gd; M = Ti, Sn) by varying the crystal chemistry of A- and B-cations. The CT band is shallow and extending to higher wavelength in highly covalent environment of Eu3+ in CaYTiNbO7 resulting in improved Eu3+ excitation levels. Contrary to this, the CT band is positioned at a lower wavelength and intense in highly polarizable environment of Eu3+ in CaGdSnNbO7 leading to poor energy transfer to Eu3+ excitation levels. Consequently, CaY0.85TiNbO7:0.15Eu3+ exhibited intense narrow red emission (fwhm3.4 nm) with high asymmetric ratio 8. Further, the phosphors CaY0.85TiNbO7:0.15Eu3+ prepared through citrate-gel route show high quantum efficiency (74%) and sharper red emission (fwhm3.2 nm) with intensity values 8 times better than the solid state one and comparable to the commercial Y2O3:Eu3+ red phosphor. Thus, these phosphors are potential candidates for pc-WLEDs applications. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Springer |
en_US |
dc.subject |
quaternary pyrochlore |
en_US |
dc.subject |
pc-WLEDs application |
en_US |
dc.title |
Dependence on Charge Transfer Band and Emission Properties by the Crystal Chemistry of A- and B-Site Cations in Eu3+-Doped Quaternary Pyrochlore-Type Red Phosphors Ca(RE)12x(M)NbO7 (RE = Y, Gd; M = Ti, Sn) |
en_US |
dc.type |
Article |
en_US |