7 documents found, page 1 of 1
Exploring the potential of Eu3+ and Mn4+ activated LaAlO3 phosphors as red and ...
Jakka, S. K.; Silva, M. M. P.; Soares, M. J.; Pavani, K.The development of efficient red and far-red emitters, for efficient plant absorption in the Photosynthetically Active Radiation (PAR) region, holds significance in contemporary plant growth control. This study focuses on the synthesis and characterization of LaAlO3 as a host material, doped with Eu3+ and Mn4+ ions, using a solid-state reaction method. The investigation encompasses the creation and analysis of ...
White Light Emitting Upconversion Nanomaterials
Pavani, K.; Kagola, Upendra Kumar; Jakka, Suresh KumarWhite light (WL) generation in nanoparticles (NPs) using upconversion (UC) is a rapidly growing field in the field of nanophotonics. In UC, multiple low-energy photons are absorbed and combined into one high-energy photon through a nonlinear optical process. NPs exhibit high efficiency in UC due to their small size and large surface area relative to volume. UC nanoparticles (UCNPs) potential uses in WL generati...
Phenomenology of Emission Color Tunability in Upconversion Nanoparticles
Jakka, Suresh Kumar; Kagola, Upendra Kumar; Pavani, K.Upconversion nanoparticles have gained significant attention for their potential in modern technology due to their ability to exhibit wide and continuous tuning of excitation and emission wavelengths. However, challenges such as low-energy photon absorption, dependence on bias for color variation, high manufacturing costs, and lack of long-term stability of emitters limit the potential of these materials. To ov...
BiLaWO6: Er3+/Tm3+/Yb3+ phosphor: study of multiple fluorescence intensity rati...
Pavani, K.; Neves, A. J.; Pinto, Ricardo J. B.; Freire, Carmen S. R.; Soares, M. J.; Graça, M. P. F.; Kumar, K. Upendra; Jakka, S.K.
Analogy of different optical temperature sensing techniques in LaNbO4:Er3+/Yb3+...
Pavani, K.; do Nascimento, J.P.C.; Jakka, S.K.; do Carmo, F.F.; Sales, A.J.M.; Soares, M.J.; Graça, M.P.F.; de Aquino, F.J.A.; Gouveia, D.X.Three of the possible approaches to optical temperature sensing of a thermographic phosphor were formally compared in upconversion (UC) of Er3+ and Yb3+ doped lanthanum orthoniobate (LNO) phosphor. The three approaches used in the study were namely fluorescence intensity ratio (FIR) of thermally coupled levels (TCL), Valley to Peak ratio (VPR) and the ratio of non-thermally coupled levels (NTCL), respectively. ...
Sharp photoluminescence of Pr3+ ions in yttrium oxyfluoride nanospheres: thermo...
Suresh Kumar, J.; Pavani, K.; Graça, M.P.F.; Soares, M.J.YOF:Pr nanoparticles prepared by Pechni sol-gel method were investigated for temperature sensing in this work. Structural investigation such as XRD, Raman, SEM and EDS were done. Photoluminescence experiments at ambient temperature for three different concentrations and with variation in temperature were performed for application in fluorescence intensity ratio (FIR) technique. The FIR of the thermally coupled ...
Photoluminescence and energy transfer studies of YAl3(BO3)(4):Sm3+/Tb3+ phospho...
Reddy, G. V. Lokeswara; Moorthy, L. Rama; Pavani, K.; Jamalaiah, B. C.Trivalent samarium (Sm3+)/terbium (Tb3+) co-doped YAl3(BO3)(4) (YAB) phosphors were prepared by solid-state reaction method. The phase, structure, optical and energy transfer studies were systematically characterized through X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence (PL) and decay measurements, respectively. Upon 406 nm excitation, both Sm3+ single- and Sm3+/Tb3+ co-doped YAB...