Advanced Optical Materials
·
2024
·
IF 8
Xinran Wang,Heng Dai,Baozhu Li,Xuhui Xu,Jian Zhang,Daiyuan Liu,Yichun Liu,Zhichao Liu
Optical materials have attracted much attention in anti-counterfeiting applications due to their visualization and multi-emission modes. However, the unit occupancy predestines the material to only monochromatic emission, inhibiting the application of optical materials in advanced information encryption. Here, a green to yellow to deep-red phosphor is reported in a Mn 2+ -activated garnet compound Ca 2 YMgScSi 3 O 12 : Mn 2+ (CYMSS: Mn 2+ ), originating from the abundant lattice sites occupying within the crystal structure by Mn 2+ ions. Three different photoluminescence (PL) emission bands peaked at 517, 576, and 720 nm from 4 T 1 (G) → 6 A 1 (S) are observed, which are attributed to the substitution of [Sc/MgO 6 ] octahedron and [Ca/YO 8 ] dodecahedron sites by Mn 2+ ions, respectively. Hence, tunable emissions from green to deep-red are realized in single Mn 2+ doping by switching the excitation source of ultraviolet (UV)/blue and X-ray, which can be further regulated by varying the Mn 2+ concentration. Multi-position occupying, color-tunable light-emitting materials offer the possibility of more advanced optical information encryption.
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JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Zhuwei Gu,Ke Xing,Sheng Cao,Bingsuo Zou,Jialong Zhao
ABSTRACT Mn 2+ doped CsPbCl 3 (Mn 2+ :CsPbCl 3 ) nanocrystals (NCs) have attracted considerable attention due to their unique strong and broad orange-red emission band, presenting promising applications in the field of photoelectric devices. However, pristine Mn 2+ :CsPbCl 3 NCs commonly suffer from low photoluminescence quantum yield (PL QY) and stability issues. Herein, we introduced europium ions (Eu 3+ ) into Mn 2+ :CsPbCl 3 NCs via the thermal injection synthesis method to obtain high performance Eu 3+ and Mn 2+ codoped CsPbCl 3 (Eu 3+ /Mn 2+ :CsPbCl 3 ) NCs. The maximum PL QY of the resulting Eu 3+ /Mn 2+ :CsPbCl 3 NCs reaches up to 90.92%. It is found that the doping of Eu 3+ ions significantly reduces the non-radiative recombination caused by high defect states, and improves the energy transfer efficiency from exciton to Mn 2+ , thereby boosting the PL performance. Moreover, doping Eu 3+ ions notably improves the UV-light and water stability of Mn 2+ :CsPbCl 3 NCs. We further demonstrate the application versatility of Eu 3+ /Mn 2+ :CsPbCl 3 NCs in white light emitting diodes (WLEDs) and optical anti-counterfeiting applications. This work provides a valuable perspective for the attainment of high performance Mn 2+ :CsPbCl 3 NCs and lays a foundation for the codoping of other lanthanide ions to adjust the luminescence properties of Mn 2+ :CsPbCl 3 NCs.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Siyi Yu,Xinyu Gong,Dongxin Shi,Mengchao Xue,Yuanyuan Zhang,Keke Han,Na Li,Guiqin Hou,Fengfeng Li
Traditional anti-counterfeiting materials have the characteristics of static display of anti-counterfeiting patterns and are easy to be disturbed by background patterns. Consequently, the development of novel luminous materials represents an imperative objective. As a novel class of matrix material, Sr 3 Y 2 Ge 3 O 12 has demonstrated considerable potential for application in the field of anti-counterfeiting. In this study, strontium yttrium germanate doped manganese ion long afterglow material was prepared by the high temperature solid phase method, and its afterglow performance and dynamic anti-counterfeiting application were studied. The experimental results show that the sample exhibits excellent luminescence characteristics. It is observed that the sample excited at 260 nm shows an emission band centred at 634 nm and a high-energy turning point at 578 nm. Using screen printing technology, design a variety of anti-counterfeiting labels. The prepared samples after ultraviolet excitation can maintain the pattern for a long time, and with the passage of time, the pattern shows dynamic attenuation, which is important in enhancing the anti-counterfeiting effect and improving product safety.
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Materials Today Chemistry
·
2025
·
IF 6.7
Chenbo Xu,Jianing Zhang,Yuexiao Pan,Yangyang Liu,Xiaoyun Yang,Hongping Xiao,Jun Zou
The quest for advanced luminescent materials with high quantum yields and excellent stability is essential for the development of light-emitting diodes (LEDs). In this context, we present a novel zero-dimensional (0D) organic-inorganic hybrid metal halides (OIHMHs), (4-BTP) 2 ZnBr 4 :Mn 2+ , which exhibits dual emission characteristics. The material achieves a photoluminescence quantum yield (PLQY) of 87.6 % under 365 nm excitation, indicating its high radiative efficiency. Furthermore, it demonstrates remarkable water resistance, maintaining its photoluminescence (PL) performance after two months of immersion in water, and excellent thermal stability up to 325 °C. Importantly, the successful incorporation of Mn 2+ ions into the (4-BTP) 2 ZnBr 4 matrix allows for tunable emission from blue-violet to green, depending on the excitation wavelength and Mn 2+ concentration. A stable white light emission in LED with a color rendering index (CRI) of 88 and correlated color temperature (CCT) of 6757 K has been obtained with the phosphor (4-BTP) 2 ZnBr 4 :Mn 2+ . This work contributes to the fundamental understanding of energy transfer mechanisms in hybrid materials.
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Advanced Optical Materials
·
2024
·Vol. 12
·期 21
·2400514
·
IF 8
Guoxiang Xing,Xiaowei Sun,Xiaorui Yang,Feilong Wen,Tianyong Zhang,Bin Li,Shuang Jiang
Recently, the potential circularly polarized luminescence (CPL) property of chiral 2D organic–inorganic hybrid perovskites has garnered attention due to their strong stability. However, the photoluminescence (PL) intensity of chiral 2D perovskite is generally low, which undoubtedly limits its development. Therefore, improving the PL and CPL intensity of chiral 2D perovskite has become an important focal point. To overcome this problem, a series of Mn 2+ -doped R/S-(MPEA) 2 PbBr 4 thin films is successfully synthesized. The Mn 2+ -doped films can produce strong orange emission under UV excitation with the highest photoluminescence quantum yield (PLQY) of 37.37%, a high value among reported chiral 2D perovskites. Moreover, all Mn: (R/S-MPEA) 2 PbBr 4 films show symmetric CPL signals. The flexible regulation of CPL is meaningful for applications, which is generally lacking in current studies. Here, it is found that the strength of CPL can be effectively regulated by doping guanidine (Gua), and the maximum g lum value of 1.4 × 10 −2 and PLQY of 51.31% is achieved, which are the highest among reported chiral 2D perovskites. This work provides a new idea for the development of CPL-active materials and lays the foundation for spin devices based on chiral hybrid 2D perovskite.
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Nanomaterials
·
2025
·Vol. 15
·期 10
·713
·
IF 4.3
Yue Fan,Yingyun Wang,Yunlong Bai,Bingsuo Zou,Ruosheng Zeng
Mn2+doping in metal halide perovskites enables host-to-dopant energy transfer, creating new emission pathways for optoelectronic applications. However, achieving high-efficiency luminescence in 2D systems remains challenging. We synthesized Mn2+-doped 2D PEA2CdCl4via the hydrothermal method, characterizing its properties through PL spectroscopy, quantum yield measurements, and DFT calculations. Flexible films were fabricated using PDMS and PMMA matrices. The 15% Mn2+-doped crystal showed orange–red emission with 90.85% PLQY, attributed to efficient host-to-Mn2+energy transfer and4T1→6A1transition. Prototype LEDs exhibited stable emission, while PDMS films demonstrated flexibility and PMMA films showed excellent X-ray imaging capability. This work demonstrates Mn2+doping as an effective strategy to enhance luminescence in 2D perovskites, with potential applications in flexible optoelectronics and X-ray scintillators.
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CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Fengqiong Tao,Cécile Genevois,Fengqi Lu,Xiaojun Kuang,Florence Porcher,Liangju Li,Tao Yang,Wenbo Li,Di Zhou,Mathieu Allix
Formation of hexagonal perovskite with mixed cubic and hexagonal stacking of AO3 layers becomes more and more difficult when the number of layers in the stacking repeating unit increases. So far, the highest number of layers reported for twinned hexagonal perovskite is 12, with alternative 5 consecutive cubic layers and one hexagonal layer in the (ccccch)2 sequence. Here, we present the unexpected formation of a 14-layer twinned hexagonal perovskite with a stacking sequence (cccccch)2 for the BaO3 layers on the Ba14Mn1.75Ta10.5O42 (Ba8MnTa6O24) composition, the first example of twinned hexagonal perovskite with a periodicity exceeding 12-layers. The B-cation and vacancy distributions are characterized by multiple efficient and complementary techniques including neutron and synchrotron powder diffraction, scanning transmission electron microscopy-high angle annular dark field (STEM-HAADF) imaging, and electron energy loss spectroscopy (EELS) and X-ray energy dispersive spectroscopy (EDS) elemental mapping. Atomic-resolution STEM-HAADF imaging and EELS/EDS elemental mapping enables direct observation of high-spin d5 Mn2+ cation ordering in the d0 Ta5+ host, thus demonstrating the great potential of this technique for probing cation ordering and performing structure determination. Moreover, atomic mapping allows for the observation of local defect structure variants, which can be a powerful tool for future new material design. The large high-spin Mn2+ cation and Ta-vacancy pair formation in face-sharing octahedral sites play key roles on both the stabilization of this 14-layer twinned hexagonal perovskite structure and the Mn2+ ordering in the central corner-sharing octahedral (CSO) positions within the five-consecutive CSO layers. Compared with the 8-layer twinned Ba8ZnTa6O24 material, the low quality factor in microwave frequency and enhanced ultraviolet and visible light absorption of Ba14Mn1.75Ta10.5O42 as well as the photocatalytic activity on water splitting are discussed in terms of the presence of high-spin Mn2+ cations in the structure.
研究领域:
材料科学
·
结构化学
·
电子显微学
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yan Zhang,Lei Zhou,Dan Li,Hui Li,Lei Zhang,Wei Shen,Ming Li,Rongxing He
Hitherto, three-dimensional (3D) perovskite single crystals with a low exciton binding energy generally possess inferior photoluminescence (PL) performance due to the spatially unconfined nature of excitons. In this work, 3D CsCdCl3 single crystals with multiple emissions from self-trapped excitons (STEs) have been developed, which unsurprisingly exhibit a discouraging PL quantum yield (PLQY) of ∼4.8%. To improve the luminescence efficiency, Mn2+ and Sn2+ are introduced into the lattice as dopants, respectively. By embedding Mn2+ ion into CsCdCl3, the long Mn–Mn distance enables the resultant material to produce an intense orange emission (∼100% PLQY) from the d–d orbital transition (4T1–6A1) of Mn2+. Intriguingly, the embedded Sn2+ triggers the formation of Jahn–Teller-like STEs that induces a subsequent deep red emission with a PLQY of ∼28.22%, which is quite high for 3D bulk perovskites. Such a remarkable PL efficiency is attributed to the distinctive bonding mode of CsCdCl3 that encourages the expression of the Sn 5s2 lone pair. Furthermore, a white-light-emitting diode (WLED) is also fabricated with Mn2+-doped CsCdCl3 to show its potential in lighting application. This work paves a new avenue to improve the luminescence performance of bulk 3D perovskite materials.
研究领域:
材料科学
·
光电
·
光子学
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高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Zishuo Yi,Weiling Huang,Yan Xu
Dual-emitting ratiometric optical thermometers with the advantages of excellent self-calibration and high-sensitivity have become a research hot spot. Herein, a dual-emissive 4-methylumbelliferone encapsulated ZIF-8 (ZIF-8⊃4-MU) modified Zn 2 GeO 4 :Mn 2+ nanocomposite was simply prepared by adding Zn 2 GeO 4 :Mn 2+ nanorods into a methanol solution containing 4-methylumbelliferone (4-MU), zinc (II) nitrate hexahydrate, and 2-methylimidazole. Accompanying with the self-assembly of ZIF-8⊃4-MU, the binding affinity of Zn 2+ ions to the surface of Zn 2 GeO 4 :Mn 2+ nanorods enables the formation of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ nanocomposite. The photoluminescence violet-blue (420 nm) and green emissions (531 nm) of the nanocomposite can be ascribed to the two independent luminescent centers of 4-MU dyes confined in ZIF-8 and the characteristic transition of 4 T 1 - 6 A 1 for Mn 2+ ions doped in Zn 2 GeO 4 , respectively. The fluorescent intensity ratios (FIRs) of 4-MU to Mn 2+ (I 420 nm /I 531 nm ) showed excellent self-calibrating temperature monitoring functions with a maximum relative sensitivity (S r ) of 1.82%· o C −1 and stable reusability in the temperature range of 20–100 °C. Also, the ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ hybridized polyvinyl alcohol (PVA) transparent film showed a similar multi-emitting behavior, as well as good processability and tensile properties . Benefiting from the excitation-dependent emitting property of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ , a multiple optical encryption of digital information was successfully realized based on a two-dimensional code, achieving an enhanced security level for preventing counterfeiting. This proof-of-concept study offers a feasible assembled way in fabricating multi-mode luminescent nanocomposites for ratiometric temperature sensing and information encryption .
研究领域:
材料科学
·
光学
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chao Zou,Yun Huang,Ling Zhao,Wenhao Ren,Zhixing Zhao,Jiapin Liu,Xing Li,Mingshan Wang,Bingshu Guo,Yuanhua Lin
The electrode deterioration and capacity decay caused by the dissolution of transition metal ions have been criticized for a long time. The branched polyethyleneimine (PEI) was employed as a functional binder for spinel lithium manganese oxide (LiMn2O4, LMO) and layer structure lithium cobalt oxide (LiCoO2, LCO) to resolve the problem. Due to the chelation reaction of amine groups, PEI polymer binder can effectively absorb soluble transition metal ions, which is beneficial to reduce the loss of active materials. For PEI-based cathode, the uniform distribution of key components is achieved by the rapid curing process of water, which endow PEI-based cathode with a higher Li+ diffusion coefficient and improved electrochemical reaction kinetics. In addition, the fixed binder coating is favorable to protecting the active materials from parasitic reaction with the lithium hexafluorophosphate (LiPF6)-based electrolyte. Therefore, the PEI-based cell shows superior rate capability and long-term cycle performance. Functional binders of this study provide a simple and effective strategy to achieve higher capacity and longer cycle stability for transition metal oxide electrodes.
研究领域:
材料科学
·
电化学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·77536-77552
·
IF 5.19
Xue Yun,Cheng Wanting,Cao Meng,Gao Jianzhang,Chen Jiaqi,Gui Yunyang,Zhu Wenmin,Ma Fuqiu
In this paper, nitric acid-modified activated carbon was used as an electrode in the electrosorption process for the removal of Co 2+ , Mn 2+ , and Ni 2+ from wastewater. The effects of applied voltage, initial pH, and coexisting ions on removal efficiency were investigated. The adsorption process was evaluated by adsorption isotherm models. The results indicated that the electrosorption process was consistent with the Langmuir model, proving that the electrosorption process was a monolayer adsorption process. The maximum adsorption capacities of Co 2+ , Mn 2+ , and Ni 2+ were 131.58 mg/g, 102.04 mg/g, and 103.09 mg/g. Electrochemical tests revealed that the specific capacitance of AC-HNO 3 was 54.11 F/g when the scanning rate was 5 mV/s, while the specific capacitance of AC was 36.51 F/g. The Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) confirmed that the content of oxygen groups on the surface of activated carbon increased after modification, which provided more adsorption sites for electrosorption. When the selected concentration of HCl was used as the eluent, the elution efficiency of Co 2+ , Mn 2+ , and Ni 2+ could reach 94.23%, 93.65%, and 90.61%. The removal efficiency could reach more than 95% after three cycles. The results of the study can be used as a reference significance for the removal of cobalt, manganese, and nickel ions from heavy metal wastewater by electrosorption.
研究领域:
环境科学
·
材料科学
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoling Zhou,Zhuodong Li,Ou Xu,Shengji Yuan,Tao Huang,Bingsuo Zou
Lead-free metal halide perovskites have attracted considerable interest due to their excellent optical properties and environmental friendliness. However, their practical application is often hindered by a low photoluminescence quantum yield (PLQY). Herein, we report a novel Cd2+/Mn2+ codoped CsCaCl3 perovskite crystal that achieves a record-breaking PLQY of 93%, which is realized through a novel energy transfer pathway. By varying the Mn2+ doping concentration in CsCaCl3:4%Cd2+, the crystal’s emission color can be tuned from cyan to yellow across the 400–700 nm wavelength range. Interestingly, the material also exhibits a distinct hydrochromic behavior. Upon humid air exposure, it undergoes a structural transformation from CsCaCl3:Cd2+/Mn2+ to Cs2CaCl4·2H2O:Cd2+/Mn2+, accompanied by a dramatic emission color shift from yellow to orange. This process exhibits excellent reversibility over multiple wetting–drying cycles. The combination of ultrahigh PLQY, tunable luminescence, and stimuli-responsive hydrochromism makes this material highly promising for advanced applications in dynamic information encryption and anticounterfeiting. Moreover, the CsCaCl3:4%Cd2+/3%Mn2+ crystal exhibits tunable energy-transfer emission under different temperatures, achieving a high relative thermal sensitivity of 5.48%·K–1, demonstrating its potential for optical thermometry.
研究领域:
材料科学
·
光电子学
·
发光材料
·
刺激响应材料
·
信息安全
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高影响因子
危险品化学品经营许可证（带存储）