Enhancing photoluminescence with Li-doped CaTiO3:Eu3+ red phosphors prepared by solid state synthesis

Synthesis of (Ca, Zn)TiO3:Eu3+ red phosphors via the sol–gel method and their luminescence properties

“…The electric dipole transition of 5 D 0 → 7 F 2 is a hypersensitive transition particularly sensitive to the chemical environment surrounding Eu 3+ ions. The 5 D 0 → 7 F 1 transition, however, is magnetic dipole allowed and nearly independent of the local environments [24,30] . The asymmetry ratio R=I( 5 D 0 → 7 F 2 )/I( 5 D 0 Fig.…”

“…Secondly, as the radius of Ti 4+ and Zn 2+ are different, the symmetry of the local environment of Eu 3+ decreases when Zn 2+ replaces part of Ti 4+ , which strengthens the transition from energy level 5 D 0 to energy level 7 F 2 , and thus leads to stronger red emission and higher color purity. Thirdly, ZnO may act as the role of solid flux in the process of formation of ZT, and stimulate the host lattice formation and grain growth, leading to higher oscillator strengths for the optical transitions, thus the PL intensity is improved [24] .…”

“…Among them, CaTiO 3 have attracted great attention in recent years due to their easy-synthesis and low-cost properties and chemical and thermal stabilities over a wide range of temperatures [21,22] . Therefore, Eu 3+ -doped CaTiO 3 can be used as potential white LEDs phosphors, which have attracted growing scientific and A c c e p t e d M a n u s c r i p t 5 technological interest and some related research work has been conducted [23][24][25] . Nevertheless, the extent of investigation on CaTiO 3 :Eu 3+ can still be improved and the properties of this class of material still cannot meet the need for commercial applications, especially the luminous intensity for photo electronics.…”

“…Nevertheless, the extent of investigation on CaTiO 3 :Eu 3+ can still be improved and the properties of this class of material still cannot meet the need for commercial applications, especially the luminous intensity for photo electronics. In order to enhance the luminous properties, much attention has been paid to modifying their composition [26,27] , microstructure [28,29] and the synthesis methods [30] , doping the charge compensators [12,24] , adding to the flux reagents [31] and so forth. To the best of our knowledge, there have been few investigations on Zn 2+ doped CaTiO 3 :Eu 3+ phosphors [32][33][34] , and there is no report about the detailed photoluminescence (PL) properties likely due to energy transfer from Zn 2+ to Eu 3+ in the CaTiO 3 host, or something similar.…”

Luminescence Properties of CaAl2O4:Eu3+, Gd3+ Phosphors Synthesized by Combustion Synthesis Method

“…There are various methods to prepare these rare earth doped compounds like solid state reaction, combustion reaction, hydrothermal method, precipitation method, micro emulsion method, microwave method, sol gel synthesis method [25][26][27][28][29][30][31].…”