A novel red phosphor Cs₂NaGaF₆:Mn⁴⁺ with ultra-strong zero-phonon lines and long wavelength phonon sidebands for high-quality WLEDs

Abstract

For high-efficiency lighting and wide color gamut backlight display, high-quality narrow-band red phosphor for WLEDs is still in urgent demand. Herein, a novel red-emitting fluoride phosphor Cs2NaGaF6:Mn4+ was successfully synthesized...

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

“…17 Ye et al discovered a new red-emitting fluoride phosphor, Cs 2 NaGaF 6 :Mn 4+ , with dual-site emission peaks, but a thorough analysis of the dual emission has not been performed yet. 18 Similarly, the phenomenon was also observed in the BaNbF 7 :Mn 4+ system, but the emission peaks of different lattice sites overlap with each other and are difficult to distinguish. 19 It is postulated that the spectral characteristics of Mn 4+ ions occupying two or more distinct lattice sites in a fluoride matrix will manifest as two or more sets of vibrational phonon sidebands.…”

Mn4+, Cr3+ Co‐doped K2LiGaF6 Phosphors with Bright Near‐Infrared Luminescence

“…The luminescence properties of Mn 4+ and Cr 3+ with 3 d 3 outer electron configurations are closely related to the crystal field environment. To determine the crystal field environment of the ions in the K 2 LiGaF 6 phosphor, the following formula was used to estimate the crystal field strength of the system: [ 35,36 ] $$$$\begin{equation}\frac{{Dq}}{B} = \frac{{15(\Delta E/Dq - 8)}}{{{{{(\Delta E/Dq)}}^2} - 10(\Delta E/Dq)}}\end{equation}$$$$ $$$$\begin{equation}\Delta E = E({}^4{{T}_{1{\mathrm{g}}}}) - E({}^4{{T}_{2{\mathrm{g}}}}) = E({}^4{{A}_{2g}} - {}^4{{T}_{1g}}) - E({}^4{{A}_{2g}} - {}^4{{T}_{2g}})\end{equation}$$$$ $$$$\begin{equation}10Dq = E({}^4{{T}_2})\end{equation}$$$$ $$$$\begin{equation}\frac{{E({}^2E)}}{B} = \frac{{3.05C}}{B} + 7.90 - \frac{{1.80B}}{{Dq}}\end{equation}$$$$…”

“…The luminescence properties of Mn 4+ and Cr 3+ with 3d 3 outer electron configurations are closely related to the crystal field environment. To determine the crystal field environment of the ions in the K 2 LiGaF 6 phosphor, the following formula was used to estimate the crystal field strength of the system: [35,36]…”

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†.…”