Photo-stimulated luminescence materials have shown significant potential in the field of information storage, but they still face critical challenges in the regulation of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ fluorescent ceramics with abundant deep traps (1.24 eV) were reported via selective Mn 2+ co-doping. This material exhibits a homogeneous and dense crystalline structure, and its narrow-band emission at 514 nm is attributed to the energy transfer of Eu-Mn. Thermoluminescence curves, X-ray photoelectron spectroscopy and electron paramagnetic resonance spectra confirm that the trap levels primarily arise from oxygen vacancies and Reidinger defects, and Mn 2+ doping suppresses the formation of shallow traps through charge compensation mechanism. Significantly, information writing and reading in the ceramic medium were achieve using 254 nm UV light and 980 nm NIR light or thermal stimulation. The excellent photo-stimulated luminescence properties and high read-write stability of Ba 0.75 Al 11 O 17.25 :Eu 2+ , Mn 2+ are expected to accelerate the development of the next generation of optical storage technology.
Inorganic luminescent materials play a critical role in the fields of multimodal anti-counterfeiting. Although integrating multiple luminescence modes into a single matrix is considered a feasible strategy, it still faces significant challenges such as the regulation and identification of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ ,Yb 3+ ,Er 3+ phosphors integrating multiple luminescence modes, including afterglow, up-conversion luminescence (UCL), photo-stimulated luminescence (PSL), and thermoluminescence (TL) were developed. Importantly, the introduction of the Yb 3+ /Er 3+ ion pair not only suppresses the concentration of shallow traps but also induces the formation of numerous deep traps (1.62 eV), which are essential for multimodal luminescence and enhance the thermal stability of the luminescence. Furthermore, through comprehensive analysis of density functional theory (DFT) calculation, TL curves, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), it is confirmed that the trap levels primarily originate from oxygen vacancies and interstitial aluminum. Finally, a highly stable flexible film was fabricated, whose emission intensity and color can be controlled by external light/thermal stimuli, and its applications in anti-counterfeiting and information encryption are demonstrated. This work facilitates the research on advanced luminescent materials and traps regulation mechanisms.
The discovery of Eu 2+ -activated narrowband green phosphor is pivotal for wide gamut liquid crystal displays (LCDs) but facing a great challenge due to the broadband emitting nature of Eu 2+ ions. Alternatively, Mn 2+ ions can generate extremely narrow green emission band but suffering from their weak absorption. Herein, Eu 2+ ions with strong absorption are used to sensitize Mn 2+ ions in the Ba 0.75 Al 11 O 17.25 host. The Mn 2+ ions exhibit a green emission band peaked at 515 nm with an extremely narrow bandwidth of 27 nm. More importantly, the Eu 2+ ions show strong absorption at 340–380 nm and a blue emission band peaked at 450 nm with a relatively narrow bandwidth of 51 nm. Thus, the Ba 0.75 Al 11 O 17.25 : Eu 2+ , Mn 2+ phosphor can be used as a dual narrowband blue and green emitting phosphor with commercial ultraviolet diode chips excitation. Moreover, this phosphor exhibits impressive overall performance that fulfills the key standards of commercial phosphors, including high emission efficiency, excellent photoluminescence thermal stability, and outstanding chemical stability. The packaged light-emitting diode (LED) using 365 nm chips, Ba 0.75 Al 11 O 17.25 : Eu 2+ , Mn 2+ and K 2 TiF 6 :Mn 4+ phosphor generates a ultrawide color gamut of 121% National Television Systems Committee (NTSC) in Commission Internationale de l'Eclairage 1931 (CIE 1931).
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