Luminescence Enhancement of Mn4+-Activated Fluorides via a Heterovalent Co-Doping Strategy for Monochromatic Multiplexing

• DOI: 10.1021/acsami.1c17135
• Publication Date: 2021-10-26T11:53:21Z
• Authors: Yuanjing Wang; Yayun Zhou; Hong Ming; Yifei Zhao; Enhai Song; Qinyuan Zhang
• Keywords: Monochromatic color

Mn4+ non-equivalent doped fluorides with high color purity red emission and relatively short decay time are crucial for wide gamut displays emerging applications, whereas the low quantum efficiency (QE) restrains their further applications. Herein, luminescence of fluoride K2NaAlF6:Mn4+ (KNAF:Mn4+) is significantly enhanced via a heterovalent co-doping strategy, where intensity obviously increased by ∼85%, but almost unchanged. The experimental characterization density functional theory (DFT) calculations provide an understanding enhancement mechanism co-doping, which enabled simultaneously improving stability reducing number quenching centers (defects impurities). Combining short-decay-time (τ = 4.03 ms) KNAF:Mn4+, Mg2+ long-decay-time 9.23 K2SiF6:Mn4+, novel monochromatic multiplexing mode in millisecond order presented, can be decoded not only high-efficiency digital camera also security. This work provides new optical information security applications inspires design Mn4+-activated luminescent materials.