Exploring dual-emission properties in Mn⁴⁺ distinctively activated BaTaF₇ red emitting phosphor

Abstract

Mn4+-activated fluoride phosphors, which exhibit narrow-band red light emission, have been extensively employed in white LED applications. However, the majority of existing research has predominantly focused on single-site emission phenomena...

Non-equivalent Mn4+ doping in mixed-anion host of K3Na(MoO2F4)2·H2O achieving short fluorescence lifetime and intense zero phonon line

“…For K 3 Na(MoO 2 F 4 ) 2 Á H 2 O:3%Mn 4+ , the intensity ratio of ZPL/v 6 (Stokes) is 65.7% at 300 K. Under 470 nm excitation, the luminescence decay curves, as shown in Fig. 4c, can be fitted well with a biexponential function, shown by eqn (7):…”

“…The equivalently doped A 2 XF 6 :Mn 4+ systems, for example, trigonal Na 2 GeF 6 :Mn 4+ , generally show a lifetime >5 ms at room temperature; 6 Mn 4+ -doped fluorides with lifetime shorter than 4 ms are difficult to achieve in equivalently doped systems but have been achieved in several non-equivalent doping cases. 7,8 As the selection rule for an electric dipole transition becomes relaxed, an intense ZPL will commonly appear as an accompanying feature. As the ZPL is of higher energy and blue-shifted when compared with Stokes phonon sideband emissions, the human visual sensitivity can be improved by 10%, when ZPL dominates the luminescence spectrum, 9 as in Na 2 WO 2 F 4 :Mn 4+ , which helps improve the luminous efficiency.…”

Optical enhancement of highly efficient organic–inorganic oxyfluoride red phosphors via the cation co-doping strategy

“…The results indicate that the new [N(CH 3 ) 4 ] 3 MoO 3 F 3 matrix can meet the high requirements of the crystal field environment for Mn 4+ doping. 23–37 For details of the calculation process, see Fig. S2 and Table S2†.…”