JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Renping Cao,Wudi Wang,Jinlong Zhang,Shenhua Jiang,Zhiquan Chen,Wensheng Li,Xiaoguang Yu
Novel Li 2 SnO 3 :Mn 4+ red-emitting phosphor is synthesized by high-temperature solid-state reaction method in air. Emission band of Li 2 SnO 3 :Mn 4+ phosphor within the range 620–760 nm is attributed to the 2 E → 4 A 2 electron transition of Mn 4+ ion. Excitation bands peaking at 330, 395, and 480 nm are attributed to O 2- → Mn 4+ charge transfer and 4 A 2 → ( 4 T 1 , 2 T 1 , and 4 T 2 ) transitions of Mn 4+ ion, respectively. The optimal Mn 4+ concentration is ∼0.4 mol% and the corresponding quantum efficiency and lifetime are ∼42.3% and 16.3 μs. The influences of temperature and Mn 4+ concentration to emission intensity are discussed and analysized. Lifetime data and time resolved spectra confirm that there is only a single type of Mn 4+ ion luminescent center in Li 2 SnO 3 :Mn 4+ phosphor. The influences of the crystal field and the “Mn 4+ -ligand” bonding to luminescence properties of Mn 4+ ion are summaried and analysized. The luminous mechanism is explained via Tanabe-Sugano energy level diagram and the configuration coordinate diagram of Mn 4+ in the octahedron. The results indicate that Li 2 SnO 3 :Mn 4+ phosphor has a hope to be used as red phosphor candidate for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Peipei Dang,Guodong Zhang,Wei Yang,Hongzhou Lian,Guogang Li,Jun Lin
Combining rare-earth ions (RE3+) in halide perovskites is a hopeful strategy to produce interesting optical properties in visible and near-infrared (NIR) regions. Here, RE3+ (RE: Nd, Ho, Er, Tm) ions are successfully introduced into Cs4Cd1–wMnwBi2Cl12 (0 ≤ w ≤ 1) vacancy-ordered quadruple perovskites through a facile hydrothermal method. In addition to the strong orange-red Mn2+ emission, the as-prepared materials exhibit the effective characteristic emission of RE3+ in the red and NIR regions via constructing a Mn2+ energy bridge. With Mn2+ gradually replacing Cd2+ in Cs4Cd1–wMnwBi2Cl12:RE3+, the photoluminescence (PL) of RE3+ in the red and NIR ranges shows an increasing trend until it reaches the strongest value (w = 1). The energy transfer processes of [BiCl6]3– → Mn2+ → RE3+ are confirmed, and the corresponding mechanism is explored. According to the manipulation of the Mn2+/Cd2+ component, an evolution process from direct to indirect band gaps is verified via a combined experimental–theoretical approach. White light-emitting diodes (LEDs) are fabricated by employing Ho3+-doped Cs4MnBi2Cl12 on near-ultraviolet (n-UV) LED chips, achieving an improved color rendering index (CRI) from 83.3 to 93.0 compared to that of the parent compound. Codoping RE3+ (RE: Nd, Ho, Er, Tm) ions into Cs4MnBi2Cl12 results in an ultrawide emission covering both NIR I and NIR II regions, implying a great potential for NIR detection application.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Yueyue Wu,Lan Liu,Zifan Li,Jiayi Xie,Zixin Wang,Guo Fang,Keyan Li,Zhenhui Tao,Xin Li,Fei Xiu,Juqing Liu
Graphical With the synergy of Mn 2+ and ODA codecoration, CDs with ultrabroadband and efficient yellow fluorescence in the solid state were synthesized through a simple one-step solvothermal process. These synthetic phosphors exhibit a production yield of 80%, an FWHM of 98 nm, and a solid-state quantum yield up to 62.8%, allowing for high-CRI white LEDs in green and health lighting. Exploiting environment-friendly and efficient phosphors is crucial to constructing high-quality and sustainable white light-emitting devices. Here, we demonstrate a facile and high-yield approach to synthesize Mn 2+ /octadecylamine (ODA)-codecorated carbon dots (CDs) with ultrabroadband and efficient yellow fluorescence in the solid state. The dots are prepared from anhydrous citric acid (CA), 1-ODA, and manganese acetate through a simple one-step hydrothermal process, with a production yield of 80%, a full width at half maxima (FWHM) of 98 nm, and a solid-state quantum yield up to 62.8%. Utilizing the synthetic CDs powder as a phosphor to directly coat on a blue light-emitting chip, the device exhibits warm white emission, with a high color rendering index (CRI) of 88, correlated color temperature (CCT) of 4215 K, and Commission International de l'Éclairage (CIE) coordinates of (0.33, 0.31), endowing great potential applications in green and health lighting.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Huaiyong Li,Lulu Xing,Shifang Wang,Mingzheng Sun,Yangbo Wang,Xufeng Zhou,Shanshan Du,Wanying Geng,Jigong Hao,Wei Li
Oxyfluorides activated with Mn 4+ have great potential in phosphors converted LED. Phosphors with intensive zero phonon line (ZPL) emission are expected to improve the performance of the light sources. Microcrystalline powders of oxyfluoride K 2 WO 2 F 4 ·H 2 O activated with Mn 4+ were synthesized by using a coprecipitation method. The structural parameters and atomic coordinations of K 2 WO 2 F 4 ·H 2 O were determined by both refinement and calculation. K 2 WO 2 F 4 ·H 2 O crystallizes in the monoclinic crystal system with C2/m group space. The unit cell could be considered as a stack of KWO 2 F 4 slices with another K + ion and H 2 O molecule in the interstitial. The morphology and photoluminescence properties of K 2 WO 2 F 4 ·H 2 O: Mn 4+ were studied as a function of Mn 4+ concentration. It is revealed that the microcrystalline shows highly orientational preferred growth. Mn 4+ shows bright red emission upon the excitation of blue light. The emission is due to the 2 E g → 4 A 2g transition. Furthermore, the photoluminescence features intensive ZPL emission and short excitation state lifetime, which is ascribed to the highly distorted coordination environment. The effects of octahedron distortion and the second coordination sphere on the ZPL emission intensity are discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yuan Zhong,Yue Zhou,Cheng Zhou,Hongxi Chen,Zhi Zhou,M.G. Brik,Mao Xia
Greenhouse plant cultivation (GPC) has attracted great attention in recent years, and the search for novel high efficiency far-red emitting phosphor is a crucial task. With this aim in view, in the present paper Ca 14 Al 10 Zn 6 O 35 :Mn 4+ (CAZO:Mn 4+ ) was investigated as a prototype phosphor. By simply incorporating excessive amount of Al, CA 10.25 ZO:Mn 4+ can meet two criteria simultaneously: it has relatively high quantum efficiency (QE) and good thermal stability, which tackle the goal of “killing two birds with one stone”. The internal QE (IQE) could further enhance from 83.9% to 90.0% due to the increased occupancy capability of Mn 4+ in [AlO 6 ] octahedron, which is evidenced by solid-state 27 Al nuclear magnetic resonance (NMR) and energy dispersive spectra (EDS) measurements. In addition, the Mn 4+ concentration-dependent excitation and emission spectra also demonstrate that the optimal doping concentration of Mn 4+ in CA 10.25 ZO host increases from 0.15 to 0.17 mol. Moreover, compared with CA 9.85 ZO:0.15Mn 4+ , the thermal stability of CA 10.25 ZO:0.15Mn 4+ improves from 55% to 58% at 150 °C and 38%–45% at 200 °C, respectively. The as-fabricated plant growth LED devices shows better potential to be applied in GPC. This design strategy shown here provides an alternative pathway to further improve the luminescence properties of phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2025
·Vol. 23
·期 1
·1-18
·
IF 12.6
Wen E.,Tian Yu,Chen Yu,Wang Zhigang,Feng Yi,Liao Zhen
Despite the encouraging developments in tumor immunotherapy, the complex tumor microenvironment (TME) and abnormal energy metabolism persist as key factors facilitating immune escape. Recent research has emphasized the significant potential of the Manganese ions (Mn 2+ ) as a “immune ion reactors” have the potential to stimulate cGAS-STING signaling pathway in modulating tumor immunotherapy. However, their efficacy is limited by insufficient targeting and lack of tumor specificity. To address these challenges, we have developed a nano-drug named as LT@MnO@MON-HA (LMMH), which incorporates manganese oxide (MnO) nanoparticles as the core and organic mesoporous silica as the outer layer. The mitochondrial glycolysis inhibitor lonidamine (LT) is encapsulated within the mesopores of LMMH and subsequently coated with hyaluronic acid to achieve precise tumor-targeted drug delivery. After reaching the tumor site, LMMH can decompose in the reducing and acidic TME, releasing LT and Mn 2+ . Once internalized by cells, LT rapidly localizes to mitochondria via functional groups, disrupting mitochondrial metabolism and increasing intracellular reactive oxygen species levels. Mn 2+ catalyze the conversion of hydrogen peroxide (H₂O₂) into more cytotoxic hydroxyl radicals (·OH), thereby enhancing chemodynamic therapy (CDT). The mesoporous silica shell of LMMH is capable of depleting glutathione in the TME, enhancing CDT. Moreover, LMMH functions as an agonist of the cGAS-STING pathway, stimulating cytokine release and activating effector T cells, which in turn triggering systemic immune responses against primary and metastatic cancers. Collectively, these finding highlights the dual mechanisms by which LMMH enhances combination immunotherapy by regulating the TME and tumor metabolism. Graphical
研究领域:
肿瘤学
·
免疫学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Wei Jia,Jianxun Bao,Hebi Zhang,Min Wu,Jianbei Qiu,Hao Wu,Yingjie Zhang
Halide perovskite materials have received considerable attention for solar cells, LEDs, lasers etc. owing to their controllable physicochemical properties and structural advantages. However, little research has focused on energy storage and conversion applications, such as use as anodes in lithium-ion batteries. In this paper, all-inorganic lead-free halide perovskite Cs 3 Bi 2 Cl 9 powders were synthesized by the grinding method, and the lattice was successfully adjusted via introducing Mn 2+ . The characterization results show that Mn-ion substitution can cause local lattice distortion to restructure the lattice, which will cause a mixed arrangement of [BiCl 6 ] octahedra to improve the performance of the anode material. This new material can provide a feasible solution for solving the problem of low specific capacity anode materials caused by unstable crystal structures, and also indicates that such perovskites with unique crystal structures and lattice tunability have broad application prospects in lithium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 6
·2402515
·
IF 7.2
Ruichen Xu,Biao Zheng,Xiaochen Fang,Xiaolong Sun,Jinquan Hong,Hai Huang,Weiguo Wang,Jun Wang
Multifunctional optical materials with temperature sensing and anti-counterfeiting properties play an essential role in the commercial applications. Herein, Mn 2+ /Nd 3+ co-doped Cs 2 AgInCl 6 (CAIC) lead-free double perovskites (DPs) is synthesized through a hydrothermal method, which exhibits visible to near-infrared (NIR) luminescence and reversible photochromic properties from yellowish to dark purple. The mechanism investigations on the photoluminescence and photochromic phenomena reveal that the incorporation of Mn 2+ ions not only acts as an intermediary in the energy transfer process from the host exciton to Nd 3+ ions, but also plays a pivotal role in the reversible photochromic response. The temperature-dependent luminescence, attributed to the contrasting thermal responses of Mn 2+ and Nd 3+ ions, enables precise temperature sensing via the fluorescence intensity ratio method. In addition, the integration of visible red emission, NIR luminescence, and photochromic properties in a single CAIC: Mn 2+ /Nd 3+ DPs, offers a multilevel anti-counterfeiting strategy. The multifunctional CAIC: Mn 2+ /Nd 3+ DPs would open up new avenues for advanced optical applications, particularly in the realms of temperature sensing and security anti-counterfeiting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Renping Cao,Jijun Huang,Xiangfeng Ceng,Zhiyang Luo,Wen Ruan,Qianglin Hu
Novel LiGaTiO 4 :Mn 4+ and LiGaTiO 4 :Mn 4+ , R (R=Mg 2+ and Al 3+ ) phosphors are synthesized by solid-state reaction method in air. Emission spectra of LiGaTiO 4 :Mn 4+ phosphor with excitation 330, 395, and 470 nm contain three emission bands peaking at ~668, 680, and 696 nm in the range of 610–800 nm, and excitation spectrum monitored at 668 nm contains broad excitation band with three excitation peaks located at ~330, 395, and 480 nm within the range 250–600 nm, which indicate that LiGaTiO 4 :Mn 4+ phosphors can be effectively excited by ultraviolet, near ultraviolet, and blue light-emitting diode chips. The optimal Mn 4+ doping concentration is ~0.6 mol% in LiGaTiO 4 :Mn 4+ phosphor. Time resolved luminescence spectra and these lifetime data indicate that it is only a single type of Mn 4+ ion luminescent center in LiGaTiO 4 :Mn 4+ phosphor. Emission intensity of LiGaTiO 4 :Mn 4+ phosphor may be enhanced 1.3–2.2 times by co-doping Mg 2+ and Al 3+ ions. The luminous mechanism of Mn 4+ ion is analyzed by Tanabe-Sugano energy diagram and configurational coordinate diagram.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Renping Cao,Dedong Peng,Haidong Xu,Shenhua Jiang,Zhiyang Luo,Hui Ao,Pan Liu
Novel NaAl 11 O 17 :Mn 2+ green phosphor is synthesized by solid-state reaction method in air. The emission band peaking at ~508 nm is observed owing to the 4 T 1 → 6 A 1 ( 6 S) transition of Mn 2+ ion, and the chromaticity coordinates are (0.0725, 0.6468). The excitation band peaking at ~360, 382, 424, 450, and 490 nm are attributed to 6 A 1 ( 6 S)→ 4 E( 4 D), 4 T 2 ( 4 D), [ 4 A 1 ( 4 G), 4 E( 4 G)], 4 T 2 ( 4 G), and 4 T 1 ( 4 G) transitions of Mn 2+ ion, respectively, which indicate that NaAl 11 O 17 :Mn 2+ phosphor may be excited by (near) ultraviolet and blue LED chip. The luminous mechanism is explained by Tanabe–Sugano diagram of Mn 2+ ion. The optimal Mn 2+ doping concentration is ~3.5 mol%. The NaAl 11 O 17 :3.5%Mn 2+ phosphor shows high quantum efficiency of ~67.84% with excitation 424 nm. The lifetime decreases from 6.72 to 6.0 ms with increasing Mn 2+ concentration in the range of 0–4 mol%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 28
·3570-3577
·
IF 2.378
Baoya Zhu,Mingyu Tang,Liying Yu,Yaoyao Qu,Fang Chai,Lihua Chen,Hongbo Wu
In this paper, silicon nanoparticles (Si NPs) were synthesized by a simple one-step procedure by applying uric acid as reducing agent. The as-prepared Si NPs exhibited emission at 425 nm under excitation at 345 nm, allowing them to be developed as a fluorescent and colorimetric probe for detection of Cu2+ and Mn2+. As a probe, the fluorescence and color change of the Si NPs induced by Cu2+ and Mn2+ exhibited contrast. As a fluorescence probe, the Si NPs exhibited intense enhancement caused by Cu2+ and Mn2+ with detection limits of 0.562 μM (Cu2+) and 1.02 μM (Mn2+). More significantly, the Si NPs could be applied to effectively detect Cu2+ and Mn2+ in real samples. Interestingly, a Si NPs-based gel membrane was fabricated and established to be selective for visual recognition of Cu2+ and Mn2+. A cell imaging experiment revealed that the Si NPs possessed excellent biocompatibility and low cytotoxicity in living cells. Additionally, the powder form of the Si NPs can be easily prepared and used to visualize latent fingerprints (LFPs) with good performance.
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huabiao Tao,Yuyin Fang,Yuanpeng Zhang,Yuepin Zhang,Jianxu Hu
Optical temperature sensing based on luminescence intensity ratio shows significant potential in achieving accurate temperature detection. In this work, Sb 3+ /Mn 2+ co-doped Cs 2 NaYCl 6 double perovskites were synthesised via a hydrothermal method . Introducing Sb 3+ ions to the host significantly enhances the radiative recombination of self-trapped excitons (STEs), resulting in a broad blue emission. The co-doping of Mn 2+ ions to the composition leads to a tunable dual-emission in the spectra, originating from the energy transfer between the STEs and Mn 2+ ions. The dependence of the dual-emission on temperature is employed for optical temperature sensing. The maximum relative sensitivity, optimal thermal resolution, and optimal thermal repeatability are determined as 1.40 % K −1 , 0.002 K and 99.3% at 250 K, respectively. The results indicate that the synthesised Cs 2 NaYCl 6 : Sb 3+ /Mn 2+ double perovskites are promising candidates for high-sensitivity optical thermometers.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
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