Defect-related luminescence behavior of a Mn4+ non-equivalently doped fluoroantimonate red phosphor

摘要

Non-equivalent or non-octahedral substitution is a crucial strategy to gain Mn 4-doped fluoride red phosphors with a short fluorescence lifetime, whereas the impact of their structural defects on the photo-luminescence (PL) properties remains unrevealed. Here, a non-equivalently doped RbSbF6:Mn4+ (RSFM) with a high quantum efficiency of 88% and a thermal stability of 121% at 425 K is newly reported to probe the defect-related PL behavior. Formation energy calculations imply that an interstitial defect lc was formed to balance the charge and stabilize the crystal structure. Concentration-dependent decay studies reveal that Mn4+ emission is quenched mainly by energy transfer to a neighboring defect K-i*. The large ionic radius of Sb5+ and defect K-i* leading to a premature optimal doping (0.11 mol%) is demonstrated by the refined contrast of the crystal structure and substitution mode among various Me4+-doped prototypes. A couple of medium T-4(2) state energies and the energy difference between the Mn4+ level with the valence band maximum enable its superior thermal stability. A higher defect concentration slightly aggravates this thermal quenching. Using the RSFM red phosphor in a white light-emitting diode offers a wide-color-gamut of 121% NTSC for backlight displays. This work would provide a new perspective to understand the defect effect on the PL behavior of special Mn4+ asymmetrically doped fluorides.

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