Advanced Science
·
2020
·Vol. 7
·期 22
·2002210
·
IF 15.84
Wen Zhang,Jiaojiao Wei,Zhongliang Gong,Ping Huang,Jin Xu,Renfu Li,Shaohua Yu,Xingwen Cheng,Wei Zheng,Xueyuan Chen
Doping is an effective strategy for tailoring the optical properties of 0D Cs 4 PbX 6 (X = Cl, Br, and I) perovskite nanocrystals (NCs) and expanding their applications. Herein, a unique approach is reported for the controlled synthesis of pure-phase Mn 2+ -doped Cs 4 PbCl 6 perovskite NCs and the excited-state dynamics of Mn 2+ is unveiled through temperature-dependent steady-state and transient photoluminescence (PL) spectroscopy. Because of the spatially confined 0D structure of Cs 4 PbCl 6 perovskite, the NCs exhibit drastically different PL properties of Mn 2+ in comparison with their 3D CsPbCl 3 analogues, including significantly improved PL quantum yield in solid form (25.8%), unusually long PL lifetime (26.2 ms), large exciton binding energy, strong electron–phonon coupling strength, and an anomalous temperature evolution of Mn 2+ -PL decay from a dominant slow decay (in tens of ms scale) at 300 K to a fast decay (in 1 ms scale) at 10 K. These findings provide fundamental insights into the excited-state dynamics of Mn 2+ in 0D Cs 4 PbCl 6 NCs, thus laying a foundation for future design of 0D perovskite NCs through metal ion doping toward versatile applications.
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PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 6
·3869-3876
·
IF 1.774
Cao Renping,Jiao Yuming,Wang Xuantian,Ouyang Xun,Chen Ting,Wan Huijun,Fan Ting,Xie Shikun
In this work, CaTiSiO 5 :Ce 3+ and CaTiSiO 5 :Ce 3+ , Mn 2+ phosphors are prepared in air via the high-temperature solid-state reaction method. The crystal structure, phase purity, and luminescence properties of the samples are investigated. CaTiSiO 5 :Ce 3+ phosphor under excitation at 320 nm emits mazarine light with chromaticity coordinates (0.1693, 0.0053) and optimal Ce 3+ doping concentration of ∼ 6 mol.%. CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor with excitation at 320 nm shows a tunable color emission from yellow to red-orange with increasing Mn 2+ concentration from 1 mol.% to 8 mol.%, the corresponding chromaticity coordinates are changed from (0.4302, 0.4507) to (0.5475, 0.3916), and the corresponding lifetimes decrease from 34.22 ns to 16.33 ns. The energy transfer (ET) process between Ce 3+ and Mn 2+ ions is confirmed by the spectral properties and lifetimes of CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor, with ET efficiency reaching ∼ 52.28%. The luminescence mechanism is explained by the energy level diagrams of Ce 3+ and Mn 2+ ions. The experimental results are of benefit for research and improving the tunable emission of other phosphors.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 11
·3678-3687
·
IF 7.059
Xinxin Han,Enhai Song,Yayun Zhou,Tao Hu,Zhiguo Xia,Qinyuan Zhang
The development of a luminescent material with visualized afterglow plays a crucial role in information security. Herein, a long-lived phosphor, KCaF3:Yb3+,Mn2+, with a visualized photon upconversion (UC) afterglow is presented. The UC emission spectrum consists of a high color purity (∼99.33%) yellow emission band peaking at ∼570 nm, and the UC afterglow signal can be observed by the naked eye in both bright and dark fields even at a high temperature of 200 °C. Moreover, the demonstration background and pigments have little influence on the UC afterglow identification. The density functional theory (DFT) calculations and the up-/down-conversion luminescence characteristics suggest that the UC afterglow originates from the long-lived exchange coupled Yb3+–Mn2+ dimers formed in KCaF3:Yb3+,Mn2+, which is independent of the conventional “afterglow trap”. The random distribution characteristics of Mn2+, and the oxygen ion (O2−) introduced by Yb3+ non-equivalent doping are the key factors for forming the efficient UC emission center in this system. Using the photon UC afterglow phosphor in screen printing ink, a visualized information encoding/decoding prototype suitable for both human and machine fast identification is demonstrated.
研究领域:
材料科学
·
光学
·
信息安全
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Dongheng Zhao,Qian Ma,Ying Sun,Lingyu Li,Huayushuo Zhang,Bolong Li,Zhiqiang Liu,Xiaomei Jiang
Zero-dimensional organic zinc halides have garnered significant attention as efficient and eco-friendly photoluminescent materials. However, its luminance efficiency, which is typically attributed to self-trapped excitons formed within zinc halide tetrahedra, often encounters a serious thermal quenching problem. This issue significantly limits its application in the field of solid-state lighting. Intriguingly, the incorporation of tetra-coordinated Mn2+ ions into these organic zinc halides can effectively mitigate unnecessary electron interactions and nonradiative energy transfer between Mn–Mn, achieving significantly improved photoluminescence quantum yield (PLQY) in the alloyed materials. In this work, a series of zero-dimensional Mn2+-alloyed 4-benzylpiperidinum zinc chloride hybrids were designed and synthesized by a solvent evaporation method. It is noteworthy that the pure zinc chloride shows a negligible visible emission at 510 nm, whereas (C12H12N)2MnxZn1–xCl4 (x = 0.25, 0.5, 0.75, 1) emits visible light ranging from green to yellow at room temperature. Incorporating Mn has led to a remarkable enhancement in PLQY, increasing from a mere 4.02% in the organic zinc halide to an impressive 94.45% in the (C12H12N)2Mn0.75Zn0.25Cl4. The white LED was successfully fabricated by employing the optimal sample as a single-component yellow phosphor coated on 450 nm chip. The correlated color temperature was determined to be 4770 K with a color rendering index as high as 91. It was also demonstrated with good luminous stability under different working currents. This research provides a straightforward approach for developing eco-friendly, cost-effective, and high-performance single-component yellow phosphors for white LED applications.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Zehua Zhang,Lili Wang,Ruiliang Zuo,Zhenzhen Jiang,Guangyong Jin
Wide band emission has aroused widespread focus in various fields such as display, plant lighting, and solar cells due to its spectral continuity. Here, a series of Sb 3+ /Mn 2+ doped Cs 2 NaLuCl 6 double perovskites with wide blue and red emissions were synthesized through a precipitation method. Enhanced self-trapped exciton (STE) emission and red emission of Mn 2+ ion are achieved by doping Sb 3+ ion to construct energy transfer channels. The temperature dependent fluorescence spectra exhibit that the emission intensity at 418 K remains 66.4% of that at 298 K in Cs 2 NaLuCl 6 : 1% Sb 3+ , 10% Mn 2+ microcrystal. Importantly, the full-width at half-maximum (FWHM) of STE and Mn 2+ ion emissions show obvious broadening as the temperature increases, which is attributed to the enhanced electron-phonon interaction. The optical temperature sensing method based on FWHM of STE and Mn 2+ emissions is designed, the corresponding maximum relative sensitivity ( S r ) values are 0.14% at 298 K and 0.61% at 448 K, respectively. Furthermore, due to the fluorescence intensity ratio (FIR) between STE and Mn 2+ ion is highly temperature-dependent, the temperature sensing based on FIR technique is investigated. The maximum S r values reach 1.31% K −1 at 448 K under 317 nm excitation. The minimum temperature resolution ( δT ) is calculated as 0.26 K at 448 K. The dual-mode temperature measurement methods based on FWHM and FIR can achieve more accurate remote temperature measurement. These results indicate the microcrystal has potential application in the fields of optical temperature thermometry.
研究领域:
光学材料
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发光传感器
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固体物理
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光子学
·
测温技术
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·
IF 7
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Yingping Huang,Zihao Wang,Maochun Hong
Weak blue light absorption severely limits the application of Mn2+-activated narrowband green phosphors. Herein, a strategy to improve the absorption of Mn2+-activated phosphors is proposed by selecting a suitable host to achieve a high doping concentration of Mn2+. Specifically, a magnetoplumbite-type compound La0.827Al11.9O19.09 with a unique layered structure is selected as the host to accommodate Mn2+ (La0.827Al11.9−xMnxO19.09,LAO:xMn2+) and a high doping concentration of x = 0.30 is obtained. Upon 450 nm excitation, the prepared phosphor LAO:0.30Mn2+ displays an intense narrowband green emission peaking at 517 nm with a full width at half-maximum (FWHM) of 28 nm, a color purity of 88% and an internal/external quantum yield of 90%/16%. Furthermore, it exhibits a low thermal quenching (6% at 423 K) and negligible color drifting (3.29‰ at 423 K). The LED device fabricated from the green phosphor LAO:0.30Mn2+, the commercial red phosphor K2TiF6:Mn4+ and a blue InGaN chip can emit bright white light with a corresponding correlated color temperature (CCT) of 5464 K and a color gamut value of 124% of the National Television Commission (NTSC) standard. These results indicate that the LAO:0.30Mn2+ phosphor has great potential for usage as a green component in wide-color gamut LCD backlight applications.
研究领域:
材料科学
·
光学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chenxi Guo,Weikang Peng,Dongxin Shi,Fengfeng Li,Mingxi Zhang,Junrong Chen,Jindi Feng
The research focus in the field of anti-counterfeiting has shifted toward the secure luminescent label technology, which has gained prominence. The exceptional luminescence properties of persistent luminescence materials are important in the achievement of effective anti-counterfeiting measures. It is in this context that Sr 3 Y 2 Ge 3 O 12 can serve as an excellent matrix material . In this study, it is found that Sr 3 Y 2 Ge 3 O 12 : 4.00% Mn 2+ exhibits a luminescence intensity, persistence time, and stability that meet the practical requirements for applications. It is shown that the fabricated persistent luminescence film can be used in anti-counterfeiting applications, thereby, demonstrating the possibility to broaden the application scope of persistent luminescence materials. An emission band centered at 634 nm and a high-energy inflection point at 578 nm are observed in the samples excited at 260 nm. Fluorescence emission at 634 nm is also achieved through X-ray excitation. Through thermoluminescence , photoluminescence , and phosphorescence spectroscopy, a comprehensive investigation of the trap characteristics and inherent mechanisms of the long persistent phosphorescence has been conducted. The novel orange-red Sr 3 Y 2 Ge 3 O 12 : Mn 2+ phosphor is extensively examined.
研究领域:
材料科学
·
光学材料
·
发光与荧光粉
·
安全技术
·
固态化学
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高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Renping Cao,Wudi Wang,Jinlong Zhang,Yujiao Ye,Ting Chen,Siling Guo,Fen Xiao,Zhiyang Luo
Sr 2 Mg 3 P 4 O 15 :R (R = Bi 3+ , Mn 2+ , and Bi 3+ /Mn 2+ ) phosphors are synthesized by a solid-state reaction method in air. Sr 2 Mg 3 P 4 O 15 :Bi 3+ phosphor with excitation 380 nm shows blue light and its emission band peaking at ∼445 nm is observed. Under excitation at 355 and 416 nm, Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor shows red emission with a single broad emission band peaking at ∼630 nm in the range of 500–800 nm owing to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. The optimal Mn 2+ ion content in Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor is ∼0.05 and the lifetime of Sr 2 Mg 2.95 P 4 O 15 :0.05Mn 2+ phosphor is ∼6.17 ms. After Bi 3+ ion is co-doped, emission intensity of Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor can be enhanced obviously due to energy transfer (ET) from Bi 3+ to Mn 2+ , which is confirmed by the luminescence properties and lifetimes of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor. Luminous mechanism and ET process of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor are explained by the simple energy level diagram of Bi 3+ and Mn 2+ ions.
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高影响因子
Science China-Materials
·
2024
·
IF 6.8
Zha Xinlin,Zuo Mengjuan,You Haining,Yan Zhong,Xiong Yi,Liu Ying,Liu Liu,Wu Yi,Liu Ke,Li Mufang,Zhao Tao,Wang Dong
Chiral conjugated polymers with controlled mesoscopic helicity are gaining attention for enantioseparation and asymmetric catalysis. However, achieving on-demand chirality and processability remain challenging. Herein, we exploit supramolecular coordination polymers formed by Mn 2+ and chiral phenylglycine derivatives (L-/D-16PhgCOOH) as templates, using m -phenylenediamine as the monomer to synthesize chiral poly( m -phenylenediamine) (PMPD). In the Mn 2+ -templated system, the PMPD’s handedness is opposite to the molecular chirality of L-/D-16PhgCOOH, while in the Mn 2+ -free system, the PMPD handedness aligns with that of the template molecule. This method allows for helicity switching of chiral polymers within a single chirality template system. The introduction of Mn 2+ is demonstrated to disrupt and reconstitute the supramolecular interactions in the co-assembly, influencing subsequent supramolecular stacking patterns. Carbonizing the resulting PMPDs directly produces chiroptical active nitrogen-doped carbonaceous nanomaterials that inherit the original helicity. Moreover, incorporating F-127 into the polymerization system enhances the aspect ratio of PMPDs, facilitating their delicate processing into chiral self-supporting two-dimensional films and three-dimensional foams. With abundant Lewis basic sites, these chiral polymers offer versatile platforms for novel chiral host-guest interactions.
研究领域:
高分子化学
·
超分子化学
·
材料科学
·
不对称催化
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xueyun Liu,Cuimei Cheng,Na Zeng,Xiaoman Li,Qing Jiao,Changgui Lin,Shixun Dai
In comparison to narrow-band upconversion (UC) luminescence from lanthanide-doped systems, broadband UC emission enables a broad and tailorable emissive color, which is desirable for tunable lasers and multicolor display applications. Herein, dual continuous broadband UC emission covering the visible spectral region at 480–720 nm has been achieved for the first time in Yb 3+ /Mn 2+ co-doped glass ceramics (GCs) functionalized with the precipitation of dual-phase γ -Ga 2 O 3 / β -YF 3 nanocrystals . A tunable UC emissive color from yellowish to orange could be obtained under 980 nm excitation by varying the Mn 2+ doping content and heat treatment temperature of GCs. We ascribe this phenomenon to the typical transition of exchange-coupled Yb 3+ -Mn 2+ dimers in tetrahedral and octahedral ligand environments. The Stokes and power-dependent UC luminescence properties, fluorescence lifetimes, site occupation and the involved UC mechanism are discussed in detail. This research contributes to a better understanding of the UC process between Yb 3+ and Mn 2+ in transparent hosts and provides a novel perspective for designing broadband-emitting UC materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Science China-Materials
·
2026
·
IF 7.7
Shao Yuhe,Liu Hongzhen,Song Zhen,Liu Quanlin
Broadband near-infrared phosphors with longer wavelengths are urgently needed for applications such as deep-tissue biomedical imaging. However, the detailed mechanism of Mn 2+ -activated NIR emission remains elusive. Guided by the theory of the nephelauxetic effect, sulfide phosphors with strong covalent bonding have become among the most promising alternatives for obtaining Mn 2+ long-wavelength luminescence. On this basis, the synergistic strategy of combining stronger crystal field effects can make the red-shift emission of isolated Mn 2+ more reliable. In this work, we studied a series of M(Ga, In) 2 S 4 :Mn 2+ (M = Ca, Sr, Ba) phosphors featuring strong crystal field environments, and reported for the first time the luminescence behaviors of Mn 2+ -doped MIn 2 S 4 :Mn 2+ (M = Sr, Ba). The preferential occupation behavior of different sites results in significant differences between MGa 2 S 4 :Mn 2+ (M = Ca, Sr) and MIn 2 S 4 :Mn 2+ (M = Sr, Ba) with the same crystal structure. The severe distortion of the polyhedra further enhances their performance in ultrawideband deep red to near-infrared luminescence (600–850 nm, FWHM ≈ 123–257 nm), which is far superior to that of similar materials. Furthermore, the fabricated PC-LED devices have excellent vascular imaging and plant illumination capabilities. This study provides a new perspective for understanding the near-infrared luminescence of Mn 2+ .
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高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Xinli Wu,Weichao Qi,Hong Zhu,Yuhui Dong,Aocheng Jiang,Huanyang Chen,Hongtan Huang,Lu Han,Yousheng Zou
CsPbX 3 (X = Cl, Br, I) perovskites have been recognized as ideal candidates for light-emitting device applications due to their excellent optoelectronic properties, but the toxicity of lead has raised significant environmental concerns. Mn doping in lead-based perovskite nanocrystals (NCs) has been conducted to mitigate lead toxicity risks while enhancing photoluminescent performance. While high Mn concentrations can increase Mn–Mn defect states, complicating the balance between high photoluminescence quantum yield (PLQY) and low lead. In this study, a PLQY of 85.8% was achieved by precisely controlling the Mn/Pb feed ratio at a concentration of 11.37%. The enhancement in PLQY is attributed to reduced Cl vacancies, which lower defect states and non-radiative recombination rates. Stability was also improved through doping, and white light emitting diode (WLED) utilizing these materials exhibited color coordinates (0.3379, 0.3479) that closely approximate standard white light emission. This work provides a solution for achieving high-quality Mn 2+ doped perovskite NCs, and highlights its potential in solid-state lighting solutions while addressing lead toxicity concerns.
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高影响因子
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