OPTIK
·
2021
·
IF 2.443
Simin Cui,Yiran Jiao,Jiangyong Liu,Yuan Pu,Jie-Xin Wang,Dan Wang
Deep-ultraviolet (DUV) light devices are receiving widely attention due to their potential use in sterilization and water purification , in particularly, during the COVID-19 pandemic. Photoluminescence detectors that demonstrate the existence of DUV light invisible to our eyes are of importance. Herein, we propose a process intensified approach via high-gravity reactive precipitation combined with hydrothermal synthesis for production of Mn 2+ doped zinc orthogermanate (Zn 2 GeO 4 : Mn 2+ ) nanophosphors for deep-ultraviolet detecting. The rotating packed bed (RPB) was used as the reactor for process intensification of the reactive precipitation and the whole processing time was significantly reduced. The Zn 2 GeO 4 : Mn 2+ phosphors show green emission upon ultraviolet or near ultraviolet excitation. In optimized conditions, the products show a sub-microrod morphology with average size of about 200 nm. Under the excitation of 254 nm light, the Zn 2 GeO 4 : Mn 2+ nanophosphors exhibit bright green emission at peak wavelength of 535 nm.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 36
·期 9
·095203
·
IF 2.9
Xiaozong Huang,Wen Li,Linghang Kong,Xiaoyan Lu,Chengzhi Yang,Bingsuo Zou
Due to the easy transformation to the non-luminous yellow δ-CsPbI3 phase in air, α-CsPbI3 nanocrystalline materials with red light emission find limited applications. Lifting its structural stability is a challenge in its quantum dot (QD) lighting field. Here we studied the doping of Mn2+ ions (5.0%) and processing by a small amount (0.315 ml) of TOP molecules on the OA-capped CsPbI3 nanocrystals. It is found that after the successful introduction of Mn2+ into the CsPbI3 nanocrystal, the grain size reduces, which leads to a stronger quantum confinement effect than the undoped QDs, which leads to the blue shift of PL and absorption spectra. The incorporation of Mn2+ simultaneously reduced defects and lifted the luminescence efficiency and lifetimes of QDs, the cause for the above optical behavior is due to the formation of excitonic magnetic polaron (EMP) excitons near the bandedge. On the other hand, the treated TOP molecule on the OA-capped NCs did not significantly affect their room-temperature luminescence. However, it improved the low-temperature emission performances of QDs significantly. Moreover, the TOP-treated QDs fixed in the PMMA film can transform into rod-like shapes in acidic environments, giving strong stability for emission, especially for the Mn-doped CsPbI3 QDs. This work has been done to improve the stability and emission efficiency of related QDs through the EMP formation near band-edge and surface modification of CsPbI3 NCs, favoring their potential applications in display and low-temperature light-emitting devices.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Zihao Wang,Jiajun Yu,Fei Tang,Changcheng Zheng,Lizhen Zhang,Kangzhen Tian
A sol-gel process together with a low-temperature sintering technique was applied for preparing Mn 2+ activated Li 2 MgSiO 4 green phosphor. Phase structure information was derived from the Rietveld refinement on its powder X-ray diffraction pattern . The luminescence performance was evaluated by characterizing the photoluminescence (PL) spectral evolution with Mn 2+ concentration and in the temperature range of 300–500 K. The optimal Mn 2+ doping level was 4 at% and the main PL quenching mechanism was identified to be the electric dipolar-dipolar interaction. The temperature-dependent PL spectra showed broad asymmetric line-profiles, and the underlying phonon effect was revealed from both experimental and theoretical works. The predominant phonon energy was determined to be 25 meV, and the luminescence quenching at high temperatures was mainly attributed to the six-phonon coupling interaction with the Mn 2+ optical center, which was further confirmed from the simulation on PL spectral lineshape. These obtained results may provide us an unprecedented approach to study the phonon effect on the luminescence characteristic for the phosphors.
研究领域:
材料科学
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光学
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Shuangyuan Shen,Chunyan Li,Yuan Li,Yingjie Cao,Yufeng Zhang,Jia Lin
In recent years, the magneto-optical properties of zero-dimensional metal halides have attracted widespread interest. In this study, we employed a vacuum solid-state reaction method to synthesize zero-dimensional, lead-free, and all-inorganic Cs 3 InCl 6 single crystals (SCs). In addition to the blue emission of self-trapped excitons (STEs) inherent to pristine Cs 3 InCl 6 , the strategic doping with Mn 2+ ions not only facilitates multicolor emissions but also significantly boosts the photoluminescence quantum yield (PLQY) from a modest 1.21 % to an impressive 32.18 %. We carried out an exhaustive investigation into the fundamental mechanisms responsible for these multicolor emissions and the intricate compositional transitions that ensue. Furthermore, the pronounced correlation between temperature-dependent photoluminescence (PL) and magnetic characteristics unveiled the genesis of ferromagnetism within both the pristine and Cs 3 InCl 6 : xMn 2+ samples. The doping-induced modifications in magnetic behavior furnish a coherent explanation for the anomalous inverse temperature dependence emission wavelength shift. Our research highlights the adjustable PL and magnetic attributes of Mn 2+ doped Cs 3 InCl 6 , yielding invaluable insights that are poised to advance its application in the next wave of optoelectronic and magnetic technologies.
研究领域:
材料科学
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光学
·
磁学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 13
·2506-2512
·
IF 5.066
X. Y. Liu,H. Guo,Y. Liu,S. Ye,M. Y. Peng,Q. Y. Zhang
The design of white-light luminescent materials with excellent thermal stability is still a challenge in the field of white-light emitting diode (W-LED) application. In this paper, a pair of novel Bi3+/Mn2+ ions co-doped into white-emitting borosilicate glasses were successfully prepared using a melt-quenching method. Their luminescence properties were evaluated using transmission spectra, photoluminescence excitation and emission spectra in the temperature range of 300–573 K, and lifetime decay curves. Upon excitation with a ultraviolet (UV) light, the co-doped glasses exhibit intense tunable emitting color between the blue and the orange-red region due to efficient energy transfer from Bi3+ to Mn2+, and a perfect white light emission is realized by appropriately adjusting the Mn2+ concentrations. Furthermore, the Bi3+ singly doped glass presents good thermal stability, showing about 72.3% of the observed room temperature (300 K) emission intensity at 423 K, while the thermal stability becomes lowered after Mn2+ ions are incorporated into the singly doped sample, attributed to serious thermal quenching from Mn2+. This work may help to better understand the interactions between Bi3+ and transition metal ions, and it might also be helpful in the future design of organic resin-free W-LEDs.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Liling Fei,Lin Yang,Peng Li,Jiangang Ma
Mn 2+ doped CsPbCl 3 nanocrystals (Mn 2+ :CsPbCl 3 NCs) show immense promise in lighting and display technologies owing to their outstanding optical characteristics. Nonetheless, high defect density, inefficient Mn 2+ doping, and poor structural robustness pose considerable challenges in the synthesis of Mn 2+ :CsPbCl 3 NCs with high photoluminescence quantum yield (PLQY) and long-term stability. This study introduces an eco-friendly room-temperature post-treatment method utilizing MgCl 2 /oleylamine solution, boosting the total PLQY of the NCs from 65% to 98%, including a 30% increase for Mn 2+ emission. Additionally, the post-treatment significantly improves the NCs’ resilience against UV light, retaining 80% of their initial PL intensity after 120 hours of UV exposure. Comprehensive analyses including density functional theory simulation and temperature-dependent PL spectra suggested that the PLQY enhancement is due to the improved Mn 2+ doping efficiency and the effective passivation of native vacancy defects. The stability of the NCs is enhanced by replacing Pb 2+ with Mg 2+ and Mn 2+ , mitigating lattice distortions within the [PbCl 6 ] 4− octahedral framework. The color rendering index of white light-emitting diodes fabricated with the post-treated Mn 2+ :CsPbCl 3 NCs achieves an exceptional value of 98. This work offers novel insights into the fabrication of high-PLQY Mn 2+ :CsPbCl 3 NCs, advancing the practical deployment of perovskite nanomaterials in various industries.
研究领域:
材料科学
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光学工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Songchao Bai,Hao Liang,Chao Li,Cunduo Tang,Gang Yang,Xiumei Xu,Xingqiang Yang,Gencai Pan,Yongsheng Zhu
Lead-free perovskites are a new type of luminescent material with non-toxic, stability and excellent photoelectric properties, which have great application in the field of photoelectric detection, solar cells, bio-imaging, etc. Here, we reported a new kind of uniform spherical rare-earth based double perovskite Cs 2 NaYCl 6 nanocrystals (NCs) as versatile hosts to accommodate ionic dopants for improving photoelectric properties especially the luminescent properties. In contrast to the low quantum yield of only 5.62%, the luminescent intensity of Cs 2 NaYCl 6 NCs can be impressively enhanced via doping Sb 3+ and Mn 2+ ions in the rare earth-based double perovskite lattices. For the Sb 3+ -doping, the photoluminescence quantum yield (PLQY) increases from 5.62% to 22.48%. On this basis, the luminescence colors can be tuned from blue to white and red via Mn 2+ ions doping and the maximum PLQY can be further improved to 38.66%. Finally, the Sb 3+ , Sb 3+ /Mn 2+ ions doped Cs 2 NaYCl 6 NCs based blue, red and white LEDs were explored, which indicates that these are potential materials in multicolor LEDs applications.
研究领域:
材料科学
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光电技术
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纳米技术
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光子学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Wanrong Zou,Jiurong Li,Xiao Gong
This paper presents a straightforward synthesis strategy for N, S co-doped carbon nanodots (N, S-CDs), aiming to achieve CDs emitting ultra-wide redshifts while obtaining excellent metal ion detection performance. The N, S-CDs display excellent fluorescence (FL) emission independence regardless of the excitation wavelength or concentration. By introducing a single dopant thiourea, the FL emission of CDs was red-shifted from 445 to 575 nm (∼130 nm). The doped N and S elements are discovered to cause the introduction of defective energy levels and an elevation in oxidation on the surface of CDs, which could potentially be the crucial factor for the ultra-wide redshift of FL emission. Also, it is investigated that solvent engineering is essential for the redshift of the emission peak, which can also be an effective way to synthesize multicolor CDs. Furthermore, the N, S-CDs can be utilized for measuring the water content in methanol solvent based on their solvent effects. Additionally, N, S-CDs have the capability of detecting Mn 2+ with high selectivity and sensitivity. The interaction of CDs with Mn 2+ resulted in an obvious change in both the UV absorption spectrum and FL lifetime. To put it differently, the reaction mechanism between CDs and Mn 2+ probably includes mixed processes of dynamic and static quenching. Zeta potential tests additionally indicate that the FL quenching is strongly correlated with the surface condition of CDs. The outcomes and discoveries offer a fresh and viable method for achieving the simultaneous production of long-wavelength glowing CDs and their analysis and detection of metal ions as fluorescent probes.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yiying Zhu,Guoxun Sun,Yining Wang,Yixin Sun,Xiaole Xing,Mengmeng Shang
Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho3+-doped Cs2NaBiCl6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn2+, apart from the characteristic emissions from Ho3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn2+ and a sharp emission peak at 657 nm from Ho3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs2NaBiCl6 to Mn2+ and then from Mn2+ to Ho3+. The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn2+ overcomes the low absorption efficiency caused by f–f forbidden transitions of Ho3+. Finally, the diverse luminescent performance within the Cs2NaBiCl6:Ho3+, Mn2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.
研究领域:
材料科学
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光学工程
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Jun Chen,Yi Chen,Dzmitry Hrynsphan,Yu Mei,Hua Pan,Jiali Wu,Jianmeng Chen,Jiachao Yao
FeII(EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated FeII(EDTA)–NO restricts its wide application, suggesting that FeII(EDTA)–NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of FeII(EDTA)–NO reduction by Mn powder coupled with manganese ion (Mn2+) recovery. We initially studied the performance of FeII(EDTA)–NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial FeII(EDTA)–NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between FeII(EDTA)–NO solution and Mn powder, suggesting that the solid–liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol–1. The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn2+ recovery. Finally, according to Arrhenius and Eyring–Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn2+ recovery were calculated as 17.25 kJ mol–1, 14.55 kJ mol–1, and 252.07 J (k mol)−1, respectively.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xu Yang,Jiaju Wu,Ying Liu,Miao Yu,Yong Li,Liping Zhao,Cheng Li,Maohui Yuan
Yb 3+ -Mn 2+ dimer based upconversion nanocrystals (UCNCs) have great prospects in biological and photonic applications. In this work, the broadband upconversion luminescence (UCL) of Yb 3+ -Mn 2+ dimer in perovskite nanocrystals is systematically engineered under multi-wavelength excitations. Under the excitation of 980, 940 and 915 nm lasers, KCdF 3 :Yb 3+ /Mn 2+ UCNCs generate yellow broadband UCL from Yb 3+ -Mn 2+ dimer at room temperature and achieve maximum intensity as Mn 2+ concentration reaches 7.5 mol%. By introducing Er 3+ ions into the KCdF 3 host matrix, the UCL color can be further tuned to pure red with high spectral purity, and the red-to-green (R/G) UC intensity ratio is promoted dramatically. The bidirectional energy transfer (ET) processes between Yb 3+ -Mn 2+ dimer, Mn 2+ and Er 3+ ions facilitate color modulation, supported by power dependence and lifetime measurements. Especially, the ET efficiency is evaluated under the multi-wavelength excitations, confirming the high efficiency of ET processes from Yb 3+ -Mn 2+ dimer to Er 3+ ions. Moreover, the obtained KCdF 3 :Yb 3+ /Mn 2+ /Er 3+ UCNCs present a maximum magnetization intensity of 2.01 emu/g when Mn 2+ concentration reaches 98.5 mol%. Both the tunable UCL and excellent paramagnetism properties indicate that these KCdF 3 :Yb 3+ /Mn 2+ /Er 3+ UCNCs have the capability of bifunctional biomarkers of nanomaterials and can be a candidate for bio-related applications.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 36
·9281-9287
·
IF 5.256
Fei Li,Zhiguo Xia,Yue Gong,Lin Gu,Quanlin Liu
The emission colors of cesium lead halide perovskite nanocrystals (NCs) can be controlled by dynamic ion exchange and Mn2+ doping. Herein we report a novel strategy for the synthesis of Cs(PbxMn1−x)(ClyBr1−y)3 NCs via a post-synthetic cation–anion cosubstitution exchange reaction to tailor their optical properties in a wide range. Colloidal CsPbBr3 and CsPb1−xMnxCl3 NCs are firstly prepared, separately, and then mixed together in hexane solution. The Pb2+ and Br− ions in the CsPbBr3 NCs are simultaneously exchanged for the Mn2+ and Cl− ions in the CsPb1−xMnxCl3 NCs, resulting in homogeneous Cs(PbxMn1−x)(ClyBr1−y)3, with preservation of the shape and crystal structure of the initial NCs. This in situ ion exchange method avoids the degradation of photoluminescence originating from the additional purification process of the NCs, and in situ Mn2+ substitution also greatly enhances the emission intensity and quantum yield of the as-obtained NCs, which is found to be related to the bound exciton effect.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）