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

Abstract

Constructing non-equivalent or non-octahedral substitution is a crucial strategy to gain Mn4+-doped fluoride red phosphors with short fluorescence lifetime, whereas their structural defect impact on photoluminescence (PL) property remains unrevealed....

Stable Polyhedron-Cluster-Based Rigid Fluoride Framework toward Zero-Thermal-Quenching Near-Infrared Emission for Prolonged LED Applications

“…Notably, this large distance between the impurity state of Cr 3+ and the VBM of the host produces a huge obstacle for electrons to overcome via thermal ionization, where an outstanding luminescence thermal stability would be expected . Such mechanism is commonly found in Cr 3+ /Mn 4+ -doped oxide phosphors. , …”

“…43 Such mechanism is commonly found in Cr 3+ /Mn 4+ -doped oxide phosphors. 25,47 3.2. Photoluminescence Properties.…”

“…Acting as a sole building block, local structural Usually, thermal quenching of Cr 3+ emission occurs via three routes: (1) multi-phonon relaxation, (2) thermal photo-ionization, and (3) thermally activated crossover between the 4 T 2 excited state and the 4 A 2 ground state. 47 Accordingly, the temperature-dependent FWHM widening evaluated by the configuration coordinate model and Boltzmann distribution is the result from the EPC effect. It fits with the following equation: 54…”