Red emission from Mn2+ on a tetrahedral site in MgSiN2

Photoluminescence properties and energy-transfer of thermal-stable Ce3+, Mn2+-codoped barium strontium lithium silicate red phosphors

“…As a consequence, the crystal field strength becomes stronger for Mn 2+ when Ba 2+ is replaced by Sr 2+ in BSLS host lattice, which results in the decrease of energy separation between the 4 T 1 ( 4 G) states and the 6 A 1 ( 6 S) ground state, and the longer wavelength emission band of Mn 2+ in BSLS host lattice. Similar emission redshift and explanation can be found in Mn 2+ -activated M 2 Si 5 N 8 (M = Ca, Sr, Ba) [40] and MSiN 2 (M = Mg, Zn) [41]. Fig.…”

The structure and luminescence properties of long afterglow phosphor Y3−xMnxAl5−xSixO12

“…It is well known that the emitting color can vary from green to deep red. Tetrahedrally coordinated Mn 2 + (weak crystal field) usually gives a green emission, whereas octahedrally coordinated Mn 2 + (strong crystal field) gives an orange to deep red emission [23][24][25]. All the Mn 2 + and Si 4 + co-doped samples show yellow-orange emission.…”

“…This indicates that effective luminescent centers in the phosphors are mainly the Mn 2 + that locates in the center of octahedron or distorted dodecahedron. According to the Tanabe-Sugano diagram of 3d 5 configuration and some related literatures [24][25][26], several sharp lines at 492, 467, 450, 419 and 409 nm can be assigned to the transition of Mn 2 + from the ground state 6 A 1 ( 6 S) to the excited states 4 T 1 ( 4 G), 4 T 2 ( 4 G), 4 A 1 ( 4 G), 4 T 2 ( 4 D) and 4 E( 4 D), respectively. Fig.…”

Luminescence and energy transfer of Mn2+ and Tb3+ in Y3Al5O12 phosphors

“…wavelength(nm) eratures [24][25][26], observed broad band emission can be ascribed to the transition of Mn 2+ from 4 T 1 ( 4 G) to 6 A 1 ( 6 S), and several absorption bands at 492, 467, 450, 419 and 409 nm can be assigned to the transition of Mn 2+ from the ground state 6 A 1 ( 6 S) to the excited states 4 T 2 ( 4 G), 4 A 1 ( 4 G), 4 T 2 ( 4 D), 4 E ( 4 D) and 2 A 1 ( 4 D), respectively. This indicates that the sample can be excited efficiently by UV light and visible light in violet-blue region.…”