Mn⁴⁺-activated oxyfluoride K₃TaOF₆ red phosphor with intense zero phonon line for warm white light-emitting diodes

Abstract

The Mn4+-doped K3TaOF6 red phosphor presents an obvious intense zero photon line emission and the color purity as high as 96.4% under 470 nm light irradiation.

Crystal Structure, Characterization, and Luminescence Properties of Mn4+‐Doped K3Nb2O4F5

“…[4] This similarity has been suggested to be due to the formation of [MnF 6 ] 2À octahedra as charge compensation in oxyfluoride hosts. [7] Some recent examples for oxyfluoride phosphors are Na 2 NbOF 5 : Mn 4 + , [8] Cs 2 NbOF 5 : Mn 4 + , [9] K 3 WO 2 F 5 • 2 H 2 O : Mn 4 + , [10] K 3 TaOF 6 : Mn 4 + , [11] Cs 3 V 2 O 2 F 7 : Mn 4 + , [12] Cs 30 (Nb 2 O 2 F 9 ) 9 (OH) 3 • H 2 O : Mn 4 + , [13] K 3 (NbOF 5 )(HF 2 ) : Mn 4 + , [14] K 2 SnOF 4 : Mn 4 + , [15] and CsMoO 2 F 3 : Mn 4 + . [16] In some cases, the luminescence spectra of Mn 4 + -doped oxyfluoride phosphors can be blue-shifted even further, with maximum emission wavelengths as low as 627 nm, as observed in K 3 WOF 7 : Mn 4 + and K 3 MoOF 7 : Mn 4 + .…”

A highly efficient Mn4+ activated Nb-based oxyfluoride red fluorescent material with excellent water stability: preparation and performance analysis

“…The lifetime of the samples prepared this time is about 3 to 4 ms. t is less than 5 ms, indicating that in the field of backlight display, this material can better realize rapid response display and effectively reduce image retention phenomena. 36 It can be seen that the lifetime of samples with different Mn 4+ doping concentrations shows obvious regularity. When the doping concentration of Mn 4+ increases from 2% to 7%, the fluorescence decay time of samples gradually decreases from 3.99 ms to 3.09 ms.…”