Spectroscopic properties of K4SrSi3O9 doped with Sm3+

Orange light‐emitting Ca3Mg3(PO4)4:Sm3+ phosphors

“…The optimum intensity was registered for the peak centered at 405 nm and hence, blue LED can be well considered as an excitation source for this phosphor. [11] Here, the electric dipole transition is weak and the peak at 599 nm forms the most intense one, thus making a strong statement that the Sm 3+ ions are occupying the sites with inversion symmetry in the Ca 3 Mg 3 (PO 4 ) 4 host lattice. 4 :0.02Sm 3+ phosphor FIGURE 3 Photoluminescence excitation spectrum of rhe Ca 3 Mg 3 (PO 4 ) 4 :Sm 3+ phosphor monitored at 599 nm FIGURE 4 Photoluminescence emission spectra of the Ca 3 Mg 3 (PO 4 ) 4 : Sm 3+ phosphors under 405 nm excitation corresponding to 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , 4 G 5/2 → 6 H 9/2 and 4 G 5/2 → 6 H 11/2 respectively.…”

“…The spectrum consists of a series of sharp excitation peaks located at 364 nm, 376 nm, 405 nm, 420 nm, 441 nm, and 478 nm, which are ascribed to the transitions from 4 F 9/2 , 4 D 5/2 , 4 K 11/2 , 6 P 5/2 , 4 G 9/2 , and 4 I 11/2 respectively. [11] The occupation of Sm 3+ ions at the sites with inversion symmetry led to a prominent luminescence intensity of the magnetic dipole transition whereas the electric dipole transition became the prominent one when Sm 3+ ions occupy the sites without inversion symmetry in the host lattice. Another excitation peak with comparable intensity was recorded at 478 nm.…”

“…The parity of the orbitals was not strictly definite at the sites without inversion symmetry and this caused a partial release of the Laporte selection rule, thereby resulting in a more intense electric dipole transition as compared to magnetic dipole transition. [11] Here, the electric dipole transition is weak and the peak at 599 nm forms the most intense one, thus making a strong statement that the Sm 3+ ions are occupying the sites with inversion symmetry in the Ca 3 Mg 3 (PO 4 ) 4 host lattice.…”

“…Conversely, the magnetic dipole transitions are less sensitive to the symmetry of the local environment. [11] The occupation of Sm 3+ ions at the sites with inversion symmetry led to a prominent luminescence intensity of the magnetic dipole transition whereas the electric dipole transition became the prominent one when Sm 3+ ions occupy the sites without inversion symmetry in the host lattice. The parity of the orbitals was not strictly definite at the sites without inversion symmetry and this caused a partial release of the Laporte selection rule, thereby resulting in a more intense electric dipole transition as compared to magnetic dipole transition.…”

High Efficiency Emission of Eu2+ Located in Channel and Mg‐Site of Mg2Al4Si5O18 Cordierite and Its Potential as a Bi‐Functional Phosphor toward Optical Thermometer and White LED Application

“…Silicates and aluminosilicates have been widely investigated in recent years as luminescent materials due to their high chemical and thermal stability. [1][2][3][4][5][6] Researchers paid special attention to materials that were doped with Eu 2+ ions because of their promising applicability in the light-emitting diode (LED) system. As a result of the parity-allowed 4f-5d transition of Eu 2+ , the broad emission band with short decay time of about a few µs is generated.…”