A novel Mn⁴⁺-activated fluoride red phosphor Cs₃₀(Nb₂O₂F₉)₉(OH)₃·H₂O:Mn⁴⁺ with good waterproof stability for WLEDs

Abstract

Red-light emitting materials, as one of the pivotal components for warm white light emitting diodes (WLEDs), have drawn increasing public focus. Among which, Mn4+ doped red-light emitting fluorides have drawn...

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

“…When handling K 3 Nb 2 O 4 F 5 : Mn 4+ in the laboratory, we noticed an unusually high resistance to hydrolysis, allowing for prolonged storage of samples under ambient conditions. Nb 5+ has previously been reported to play a significant role in the moisture resistance of oxyfluoride phosphors by suppressing the hydrolysis of [MnF 6 ] 2− groups [9,13] …”

“…Nb 5 + has previously been reported to play a significant role in the moisture resistance of oxyfluoride phosphors by suppressing the hydrolysis of [MnF 6 ] 2À groups. [9,13]…”

“…[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 multi-centre activated single-phase white light phosphor with high efficiency for near-UV based WLEDs

“…Fig. 9d exhibits the thermal activation energy calculation of GSBO:0.03Ce 3+ ,0.18Tb 3+ ,0.05Sm 3+ sample with the Arrhenius equation: 38,39 …”

K2LiScF6:Cr3+/Mn4+fluoride phosphor with enhanced broadband emission for NIR pc-LEDs

“…In this case, V = 548.13 Å 3 , x c = 0.10, N = 4, and then R c was calculated to be 13.78 Å, which is much larger than the critical distance (5 Å) required for exchange interactions. Therefore, the energy transfer mechanism may be attributed to electric multipolar interactions, which can be determined using the following equation: 28 …”