Enhancing the luminescence performance of Ca2−xSrxBO3Cl:Eu2+,Dy3+ by substitution of Sr2+ for Ca2+

Cao, Junlong; Ding, Songsong; Zhou, Yunpeng; Ma, Xilin; Wang, Yuhua

doi:10.1039/d2tc02382b

Cited by 7 publications

(4 citation statements)

References 46 publications

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“…All of the elements in SrAl 2 O 4 : Eu 2+ , Dy 3+ , Gd 3+ were in the expected valence state, according to XPS. All of these elements' peaks were consistent with their respective standard central values [35,36].…”

Section: Elemental Analysissupporting

confidence: 72%

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Gao

Liu

et al. 2023

Nanomaterials

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A series of long-afterglow luminescent materials (SrAl2O4: Eu2+ (SAOE), SrAl2O4: Eu2+, Dy3+ (SAOED) and SrAl2O4: Eu2+, Dy3+, Gd3+ (SAOEDG)) was synthesized via the combustion method. Temperature and concentration control experiments were conducted on these materials to determine the optimal reaction temperature and ion doping concentration for each sample. The crystal structure and luminescent properties were analyzed via X-ray diffraction (XRD), photoluminescence (PL), and afterglow attenuation curves. The outcomes demonstrate that the kind of crystal structure and the location of the emission peak were unaffected by the addition of ions. The addition of Eu2+ to the matrix’s lattice caused a broad green emission with a central wavelength of 508 nm, which was attributed to the characteristic 4f65d1 to 4f7 electronic dipole, which allowed the transition of Eu2+ ions. While acting as sensitizers, Dy3+ and Gd3+ could produce holes to create a trap energy level, which served as an electron trap center to catch some of the electrons produced by the excitation of Eu2+ but did not itself emit light. After excitation ceased, this allowed them to gently transition to the ground state to produce long-afterglow luminescence. It was observed that with the addition of sensitizer ions, the luminous intensity of the sample increased, and the afterglow duration lengthened. The elemental structure and valence states of the doped ions were determined with an X-ray photoelectron spectrometer (XPS). Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) were used to characterize the samples. The results show that the sample was synthesized successfully, and the type and content of ions in the fluorescent powder could be determined. The fluorescence lifetime, quantum yield, bandgap value, afterglow decay time, and coordinate position in the coherent infrared energy (CIE) diagram of the three best sample groups were then analyzed and compared. Combining the prepared phosphor with ink provides a new idea and method for the field of anti-counterfeiting through screen printing.

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Section: Elemental Analysissupporting

confidence: 72%

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Gao

Liu

et al. 2023

Nanomaterials

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“…The variation in peak size and lack of symmetry arise from the anisotropy resulting from crystal field splitting upon Eu 2+ doping. [43] This also confirms that Eu 2+ is incorporated into the lattice of the material. Furthermore, after the sample was excited under a UV lamp for 30 min, another EPR measurement of the sample confirmed a gradual decrease in the resonance signal of Eu 2+ with increasing delay time.…”

Section: Pl Performancesupporting

confidence: 58%

Unveiling the Potential of Sunlight‐Driven Multifunctional Blue Long Persistent Luminescent Materials via Cutting‐Edge Trap Modulation Strategies

Cao,

Ding,

Zhou

et al. 2023

Advanced Optical Materials

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Numerous challenges persist in the field of long persistent luminescence (LPL) materials, including the unclear mechanism of persistent luminescence, low efficiency of sunlight excitation, and limited availability of commercial materials. To address these issues, a LPL material, SrAl2Si2O8:x% Eu2+,y% Dy3+, is synthesized for excitation by UV lamps or sunlight. Dy3+ doping remarkably extends the afterglow duration from 2 to 7 h under UV lamp excitation, exhibiting a remarkable enhancement of 350%. Notably, SrAl2Si2O8:4.0% Eu2+, 3.0% Dy3+ shows 2 h afterglow duration when exposed to sunlight, surpassing other LPL materials and expanding potential applications. XPS and XANES measurements confirm Eu2+ as the luminescent and persistent luminescent centers, while Dy3+ increases trap diversity. Through meticulous analysis of the EPR and XPS data, it is elucidated that the material encompasses two distinct types of traps, namely oxygen vacancies and may be traps. This provides a basis for subsequent trap analysis in LPL materials. Microstructural analysis examined ion coordination environment changes due to Eu2+ and Dy3+ doping. The mechanical luminescent properties are characterized, and a plausible afterglow mechanism is proposed based on the experimental results, offering insights for further research into LPL materials.

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“…Information security is of great significance in the development of enterprises, social stability, military security, and even personal daily life. − Over the past few decades, a wide variety of technologies, including markering, holograms, magnetism, plasmonic labels, and luminescence, have been investigated for use in anticounterfeiting and information encryption. Among these technologies, luminescence has demonstrated great potential because of its timeliness, simplicity, multiencoding dimensions, and low cost. − So far, diverse luminescent materials featuring photoluminescence (PL), thermoluminescence (TL), upconversion luminescence (UCL), downconversion luminescence (DCL), persistent luminescence (PersL), mechanoluminescence (ML), and photostimulated luminescence (PSL) have been widely developed for high-level encryption. − However, most PL-based anticounterfeiting labels are easily falsified by certain alternatives due to their static luminescence color and intensity, single-emission mode, or simple design . Therefore, dynamic optical materials with multimode luminescence characteristics are highly desired for advanced anticounterfeiting and information encryption applications. − …”

Section: Introductionmentioning

confidence: 99%

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption

Yi,

Liu,

2023

Inorg. Chem.

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Optical storage technology for information encryption is a popular means of safeguarding information. Herein, a Bi3+-activated ZnGa2O4 multimode dynamic photoluminescence (PL) material is developed. Upon being irradiated with an ultraviolet lamp at a fixed excitation wavelength of 254 nm, the ZnGa2O4: x% Bi3+ (x = 0.5–5.0) samples exhibit varying degrees of dynamic PL emission due to a distinct Bi3+ doping effect. The mechanism underlying the dynamic PL of ZnGa2O4: Bi3+ associated with Bi3+-activated trap concentration modulation is investigated using thermoluminescence spectra. Additionally, the ZnGa2O4: 5% Bi3+ sample shows a reversible thermally responsive dynamic PL with a color variation from blue to red upon heating from 283 to 393 K. Predesigned procedures based on single-wavelength-mediated photochromic and thermochromic dynamic PL emissions of ZnGa2O4: Bi3+ are designed for rewritable optical data storage and high-level information encryption. Also, an enhanced encryption scheme with a mask encoding technique applying a ZnGa2O4: Bi3+ hybridized polyvinylidene difluoride film is then proposed to increase the security level. Accordingly, this work provides a feasible way to rationally design dynamic PL material offering more creative designs for safeguarding information via encryption.

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Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Abstract: As a reusable material, Persistent luminescence (PersL) materials has a wide range of applications in emergency response, information encryption and other fields. However, there is still a lack of commercial...

Cited by 7 publications

References 46 publications

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Unveiling the Potential of Sunlight‐Driven Multifunctional Blue Long Persistent Luminescent Materials via Cutting‐Edge Trap Modulation Strategies

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption

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Enhancing the luminescence performance of Ca2−xSrxBO3Cl:Eu2+,Dy3+ by substitution of Sr2+ for Ca2+

Abstract: As a reusable material, Persistent luminescence (PersL) materials has a wide range of applications in emergency response, information encryption and other fields. However, there is still a lack of commercial...

Cited by 7 publications

References 46 publications

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Enhanced Fluorescence Characteristics of SrAl2O4: Eu2+, Dy3+ Phosphor by Co-Doping Gd3+ and Anti-Counterfeiting Application

Unveiling the Potential of Sunlight‐Driven Multifunctional Blue Long Persistent Luminescent Materials via Cutting‐Edge Trap Modulation Strategies

Multimode Dynamic Photoluminescence of Bi3+-Activated ZnGa2O4 for Optical Information Encryption

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Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption