Synthesis, structure, and luminescence properties of a novel double-perovskite Sr 2 LaNbO 6 :Mn 4+ phosphor

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO4:Mn4+

“…On the other hand, as the severe thermal quenching (studied afterward), thermal phonon induced nonradiative process is also possible. We use the following formula to characterize the decay process:…”

“…Fluorescence decays are in a double exponential manner. The average lifetime can be calculated by …”

Crystallization‐induced valence state change of Mn2+ → Mn4+ in LiNaGe4O9 glass‐ceramics

“…The excitation spectra for GC (LiNaGe 4 O 9 : Mn) monitored at 663 nm reveal several excitation bands from 250 nm to 500 nm. Based on a Gaussian function, this band is decomposed into four sections peaking at 463, 366, 342, and 300 nm that can be associated with the transitions from 2 A 2g ground state to 4 T 2g , 2 T 2g , and 4 T 1g excited state of Mn 4+ and the Mn‐O charge transfer band, respectively, which is in good agreement with the absorption spectra (Figure B). Therefore, based on the emission and excitation spectra of G and GC, we can safely conclude that the oxidation state of Mn ion changes from Mn 2+ in glass to Mn 4+ in GC after heat treatment at around T c ( 550 and 560°C).…”

Mn4+-activated BaLaMgSbO6 double-perovskite phosphor: a novel high-efficiency far-red-emitting luminescent material for indoor plant growth lighting

“…34,35 The perovskite-type compounds are potential hosts for luminescent materials due to their excellent optical properties and diversity of their structure and composition. [36][37][38][39][40][41][42][43][44] Therefore, double perovskite BaLaMgSbO 6 (BLMS), which contains many [SbO 6 ] octahedrons, would be a novel good host for doping Mn 4+ ions.…”