Synthesis and photoluminescence properties of a new red emitting phosphor: Ca3(VO4)2:Eu3+; Mn2+

Vanadate Phosphors for Energy Efficient Lighting

“…Thus, the luminescence intensity increases with the fall of non-radiative recombination. In addition, after a certain critical size is achieved, high temperature is unfavorable for high luminescence intensity [62]. The optimum temperature achieved in our experiment for Ca 2.925 (VO 4 ) 2 :0.05Eu is 1050°C as shown in Figure 12.20(a).…”

“…In our case, initially the vanadate center absorbs the UV light by the vanadate groups inside the host is subsequently a non-radiative transfer to Eu 3+ . Finally it comes back to the ground state through a radiative transition and emits its characteristic radiation [62]. The emission spectra of the Ca 3-3x/2 (VO 4 ) 2 :xEu (0.01 ≤ x ≤ 0.09) phosphors with different Eu 3+ concentration are shown in Figure 12 to the spin-orbit states 7 F j ( j = 0, 1, 2, 3, 4) of Eu 3+ [62].…”

“…Finally it comes back to the ground state through a radiative transition and emits its characteristic radiation [62]. The emission spectra of the Ca 3-3x/2 (VO 4 ) 2 :xEu (0.01 ≤ x ≤ 0.09) phosphors with different Eu 3+ concentration are shown in Figure 12 to the spin-orbit states 7 F j ( j = 0, 1, 2, 3, 4) of Eu 3+ [62]. The most intense emission peak located at 613 nm is due to 5 D 0 → 7 F 2 electronic dipole-dipole transition, indicating a non-center-symmetrical environment for Eu 3+ ions.…”

“…86-0995) refl ections are detected.With the increase of the annealing temperature, the height of these refl ections increases. This means that the crystallinity enhances gradually[62]. The crystallite size (D) of…”

Synthesis and luminescence properties of red phosphor CaO: Eu3+

“…(2) High temperature is unfavorable for high luminescence intensity. Because too high temperature will lead to larger scale particles and conglomeration, even to netlike sintered body, which means smaller cross section for absorption of light and decreases the PL intensity [10,11] . Therefore, the annealing temperature for CaO: 1.0 mol% Eu 3+ is optimized at 1 100 ℃ in our experiment.…”