Persistent luminescence induced by the introduction of multi-valent Mn ions in K2LiBF6 (B = Al, Ga and In) fluoride phosphors

Luminescence Enhancement of Mn4+-Activated Fluorides via a Heterovalent Co-Doping Strategy for Monochromatic Multiplexing

“…The broad-band blue excitation peak at 460 nm belongs to the 4 A 2g ⃗ 4 T 2g spin-allowed transition, and the sharp-line emission peaks (the strongest peak is at 631.5 nm, and the ZPL peak is at 623 nm) come from the spin- and parity-forbidden 2 E g ⃗ 4 A 2g transition. The change of ZPL intensity may be attributed to the change of the actual doping concentration and local environment of Mn 4+ . , The luminescence decay curve of 6 mol % Mn 4+ -doped KNAF sample is shown in Figure c. The average PL decay time value is 3.80 ms, which is lower than that of Mn 4+ -doped KSF phosphor.…”

“…The change of ZPL intensity may be attributed to the change of the actual doping concentration and local environment of Mn 4+ . 27,28 The luminescence decay curve of 6 mol % Mn 4+doped KNAF sample is shown in Figure 2c. The average PL decay time value is 3.80 ms, which is lower than that of Mn 4+doped KSF phosphor.…”

Large Spectral Shift of Mn2+ Emission Due to the Shrinkage of the Crystalline Host Lattice of the Hexagonal CsCdCl3 Crystals and Phase Transition

“…Mn 2+ ions with 3d 5 multiplet have been recognized as one of the most effective activators in various solid-state luminescence structures including perovskites due to the efficient energy transfer from the host lattice to Mn 2+ . − The broad band emission of Mn 2+ ions varies from green to red, which is largely dependent on the coordination geometry and crystal field of the sites occupied by Mn 2+ . Most Mn 2+ ion-doped all-inorganic halide perovskite crystals are QDs in nanoscale physical sizes dispersed in a solution with ligands.…”

Enhancement in the water resistance and thermal stability of Na3HTiF8:Mn4+ by co-doping with organic amine cations

“…Θ D,i is inversely proportional to the U iso value, indicating that the latter has higher structural rigidity, and this is the main reason for the good water resistance of the samples. 22,36,37…”

“…Θ D,i is inversely proportional to the U iso value, indicating that the latter has higher structural rigidity, and this is the main reason for the good water resistance of the samples. 22,36,37 Previously, the Han group reported that K 2 (H)TiF 6 :Mn 4+ was synthesized by adding protons to improve the general rigidity of the structure and it had good water resistance. 22 The luminescence intensity of the K 2 (H)TiF 6 :Mn 4+ phosphor was 92% of the initial value after being soaked in water for 180 min.…”