ELECTROCHEMISTRY COMMUNICATIONS
·
2021
·
IF 4.724
Lin Tang,Jinliu Wei,Zhixiong Cai,Feiming Li,Maosheng Zhang,Xiaomei Chen,Xi Chen
The electrochemical behavior and consequent luminescence properties of Mn-doped CsPbCl 3 perovskite (Mn:CsPbCl 3 ) nanocrystals (NCs) were investigated by cyclic voltammetry (CV) and electrochemiluminescence (ECL) measurements. Mn:CsPbCl 3 NCs could be electrochemically injected with electrons or holes at different potentials to produce ECL through both annihilation and coreactant routes. Importantly, it has been found that the ECL involving the coreactant could originate from two pathways: energy recombination at the surface, and energy transfer from the excited CsPbCl 3 host to the dopant center, producing emission via Mn d - d transition, which is different from the photoluminescence (PL) of Mn:CsPbCl 3 NCs alone, which contains dual emissions from both the host and the dopant.
研究领域:
材料科学
·
光电化学
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DOI
高影响因子
RARE METALS
·
2026
·
IF 11
Chunshen Li,Yuexin Zhu,Wendong Nie,Haomiao Zhu,Peng Zhang
en Narrowband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) featuring low full-width at half maximum (FWHM) and high conversion efficiency are crucial for chemical content evaluation, light therapy, and bioimaging. Recently, Yb 3+ doped CsPbCl 3 nanocrystals (NCs) have emerged as promising phosphors for NIR pc-LEDs, delivering narrowband 980 nm emission with an FWHM below 50 nm and a photoluminescence quantum yield (PLQY) exceeding 100%. However, the practical employment of CsPbCl 3 : Yb 3+ NCs is limited by their poor thermal stability. In this work, we present a high-temperature stable, melt-grown CsPbCl 3 : Yb 3+ single crystal (SC) and narrowband NIR pc-LEDs fabricated from CsPbCl 3 : Yb 3+ powder and violet LED chips. Our pc-LEDs achieve a low FWHM of 46.81 nm and a high conversion efficiency of 2.44% at a drive current of 20 mA. More importantly, our pc-LEDs exhibit exceptional thermal stability, retaining 98.2% of their PL emission intensity at 360 K. Finally, these NIR pc-LEDs successfully demonstrate applications in night vision, vein imaging, non-destructive testing, and the detection of early fruit bruises. This work underscores the significant potential of narrowband 980 nm pc-LEDs based on CsPbCl 3 : Yb 3+ crystal for diverse applications. 摘要 zh 具有窄半峰全宽和高转换效率的窄带近红外荧光粉转换发光二极管在化学成分分析、光疗及生物成像等领域具有关键应用价值。近年来,Yb 3+ 掺杂CsPbCl 3 纳米晶已经成为近红外荧光粉转换发光二极管的潜在荧光材料,其可实现980 nm窄带发射,低于50 nm的半峰全宽和超过100%光致发光量子产率。然而,CsPbCl 3 : Yb 3+ 纳米晶的热稳定性较差,严重限制了其实际应用。本研究通过熔融生长法制备了高温稳定的CsPbCl 3 : Yb 3+ 单晶,并利用CsPbCl 3 : Yb 3+ 粉末与紫光发光二极管芯片制备了窄带近红外荧光粉转换发光二极管。在20 mA驱动电流下,该荧光粉转换发光二极管的半峰全宽低至46.81 nm,转换效率高达2.44%。更重要的是,其展现出优异的热稳定性,在360 K环境下仍能保持98.2%的光致发光强度。最后,该近红外荧光粉转换发光二极管在夜视成像、静脉探测、无损检测及水果早期损伤识别等场景中实现了成功应用。本研究证实,基于CsPbCl 3 : Yb 3+ 晶体的980 nm窄带近红外荧光粉转换发光二极管在相关领域具有广泛的应用前景。
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shuo Wang,Shimin Liu,Jingyi He,Jiangwei Liang,Tianlin Chen,Xuemei Fan,Shiqing Xu
Spectroscopic screening of Mn:CsPbX 3 (X = Cl, Br, I) nanocrystals embedded in a B–Si–Zn–Al glass matrix identifies CsPbCl 3 as a suitable sensitizing host for Mn 2+ emission because of its favorable energy-level alignment. However, achieving efficient Mn 2+ luminescence in CsPbCl 3 -based microcrystalline glass remains challenging due to the intrinsically weak spin-forbidden d–d excitation of Mn 2+ and the difficulty of precipitating CsPbCl 3 nanocrystals within a rigid glass network. In this work, Mn 2+ incorporation is proposed as an effective strategy to facilitate the local crystallization of CsPbCl 3 nanocrystals, as supported by HRTEM lattice-fringe observations, XPS analysis, and photoluminescence evolution. Combined with non-equilibrium kinetic control, rapid water quenching helps preserve a larger population of small and dispersed Mn:CsPbCl 3 luminescent units, thereby enhancing the macroscopic orange-red emission. The corresponding spectral behavior is consistent with host-mediated sensitization of Mn 2+ . Compared with thermodynamic annealing, which improves intrinsic radiative efficiency through structural relaxation and defect reduction, the water-quenched sample exhibits stronger steady-state photoluminescence despite a lower absolute quantum efficiency. This contrast indicates that the enhanced brightness mainly originates from the increased population of active sensitized Mn 2+ -emitting centers rather than from improved intrinsic efficiency of individual centers. These results suggest that coupling Mn 2+ -assisted local crystallization with non-equilibrium water-quenching control provides a feasible route for designing high-brightness orange-red luminescent microcrystalline glasses.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 10
·3037-3048
·
IF 6.641
Ju-Ping Ma,Ya-Meng Chen,Lu-Min Zhang,Shao-Qiang Guo,Jian-Dang Liu,Hong Li,Bang-Jiao Ye,Zhi-Yong Li,Yang Zhou,Bin-Bin Zhang,Osman M. Bakr,Jun-Ying Zhang,Hong-Tao Sun
Doping has been established as a powerful approach for endowing lead halide perovskite nanocrystals (NCs) with novel properties. However, our fundamental understanding of the local structure of dopants, doping efficiency and luminescence properties of these NCs is still very sparse. Here, we provide the first experimental evidence regarding the local structure of rare earth ions in CsPbCl3 NCs, based on the analysis of extended X-ray absorption fine structure spectroscopy. Our result suggests that Yb3+ occupies the Pb2+ crystallographic sites in CsPbCl3 NCs. We further demonstrate a strategy to examine the determinant of the doping efficiency in lanthanide-doped lead halide perovskite NCs, which enables us to uncover the important role of structural defects in affecting the doping efficiency. A broad range of experimental characterization techniques including steady-state and time-resolved luminescence spectra, X-ray absorption spectra, and positron annihilation lifetime spectra, coupled with first-principles calculations, help us identify that the doping efficiency is associated with structural defects in NCs and that the formation of a higher-concentration of defects favors incorporation of a higher-concentration of dopants into the lattice. Importantly, we demonstrate that the concept of defect-assisted doping is not limited to the model system of Yb3+-doped CsPbCl3 NCs, but can be used as a guideline to rationally tune the doping efficiency of lanthanide-doped halide perovskite NCs. We also show that lanthanide-doped CsPbCl3 NCs demonstrate anomalous decay of the band-edge emission, which we propose is due to the existence of shallow trapping states near the conduction band. Our results greatly deepen the understanding of the structural and photophysical properties of lanthanide-doped lead halide perovskite NCs, and highlight the possibility to use the chemistry of defects to tailor the doping efficiency of halide perovskite NCs.
研究领域:
材料科学
·
光物理学
·
无机化学
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DOI
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Fan Sui,Mingyue Pan,Zhengyan Wang,Ming Chen,Wenjie Li,Yan Shao,Weimin Li,Chunlei Yang
The emission and absorption properties of Mn doped CsPbCl 3 NC make it ideal candidates as luminescent down shifting layer material for solar cells, However, effective Mn doping and further quantum yield improvement remains challenging. We present our modified hot injection route to obtain Mn doped CsPbCl 3 nanocrystals with different morphologies and enhanced quantum yield. The samples presented were synthesized with precursor MnCl 2 and PbCl 2 with the ratio of 1:1, 1:2, 1:2.5 and 1:3. For samples with lower Mn doping level, the as prepared samples are uniform nanocubes with average size of 11 nm. When MnCl 2 amount is increased beyond 2.5, large piece of nanosheets were found by TEM and AFM with ultrathin thickness and strong quantum confinement effect. CsPbCl 3 nanocrystals with optimal Mn doping level show enhanced quantum yield of 69%. Luminescent down shifting layers prepared from Mn doped CsPbCl 3 nanocrystals successfully increased short-circuit current (6.67%) and PCE (1.67%) of Cu(In,Ga)Se 2 solar cell.
研究领域:
材料科学
·
能源技术
·
纳米科技
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yaheng Zhang,Chao Fan,Dongdong Ge,Qinggang Zhang,Shouqiang Huang,Guohua Zhang,Jiayu Su
For the detection of anions from wastewater, the perovskite materials synthesized should have suitable stability and be as hydrophilic as possible, and it’s not appropriate to introduce organic ligands. Mechanochemical reaction can avoid the use of organic solvents and provide improved stability for the perovskite materials due to their large particle size and compact structure, but their fluorescence is often too weak. To solve this problem, the Mn 2+ doping effect was introduced into the CsPbCl 3 crystals, and their synthesis doping strategies driven by mechanical grinding were systematic studied. The optimal Mn 2+ -doped CsPbCl 3 (CsPbCl 3 :Mn) product was obtained by optimizing the synthesis conditions of Mn 2+ source, grinding time on each reaction stage, Mn: Pb feeding ratio, and the sintering temperature . CsPbCl 3 :Mn had the same crystal structure as its undoped counterpart, while an obvious photoluminescence emission peak at 604 nm was obtained, which was originated from the doped Mn 2+ ions. CsPbCl 3 :Mn had good stability against the ethanol environment and there was no organic ligands to hinder the ion exchange between Cl - and Br - from wastewater. Through testing the color difference of the resultant powders, a linear relationship with high correlation coefficient above 0.99 was established between chroma and Br - concentrations, and the Br - concentration in wastewater was accurately determined, demonstrating a promising application prospect of CsPbCl 3 :Mn in the fast detection of Br - ions.
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 4
·2202321
·
IF 10.05
Chu-Yao Zhong,Ladi Li,Qing Chen,Kai-Zhe Jiang,Fa-tang Li,Zhao-Qing Liu,Yibo Chen
Doping cesium lead halide perovskite nanocrystals (NCs) with Mn 2+ brings attractive long-wavelength emission and flexible color tunability. However, due to multiple competing factors, the exciton-to-Mn 2+ energy transfer efficiency is low. In this work, a simple structure-optimization strategy is applied to enhance the exciton-to-Mn 2+ energy transfer by synthesizing Mn 2+ activated 3D/0D Cs–Pb–Cl perovskite composition composed of 3D CsPbCl 3 and 0D Cs 4 PbCl 6 NCs. The results reveal that the energy transfer efficiency and the photoluminescence quantum efficiency of the Cs–Pb–Cl composite are 65.3% and 77.3%, respectively, which are 1.4 and 3 times the corresponding values of the single-phase CsPbCl 3 :Mn 2+ NCs. Based on the detailed experimental and calculation results, the performance enhancement is demonstrated to stem from the optimized growth process of 3D CsPbCl 3 NCs when co-generating with 0D Cs 4 PbCl 6 NCs. The strong lattice rigidity of the optimized CsPbCl 3 NCs suppresses the nonradiative combination rate of the excitons, thus alleviating the main competing factor of the energy transfer process and improving the energy transfer efficiency. Fabrication of a white light-emitting diode prototype further illustrates the application potential of the orange-emitting Cs–Pb–Cl composite NCs for general lighting.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光子学
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DOI
高影响因子
Nanomaterials and Nanotechnology
·
2020
·
IF 2
Shuhong Xu,Guangguang Huang,Chunlei Wang,Haibao Shao,Yiping Cui
In this work, we improved the photocurrent of self-powered ultraviolet photodetector via doping manganese in CsPbCl3 perovskite nanocrystals light harvester. The doped manganese in nanocrystals has the following three features to assist electron transfer from CsPbCl3 nanocrystals to titanium dioxide: (i) the fast exciton-to-manganese energy transfer process benefits for competing electrons with perovskite exciton recombination, (ii) the charge carrier lifetime is very long for manganese d-states due to its spin and orbital forbidden transition, and (iii) the electrons can effectively transfer to the titanium dioxide layer from 4T1 of manganese d-states due to the smaller energy barrier. Based on the above, the self-powered photocurrent density of photodetectors has nearly twice enhancement from 0.08 mA·cm−2 to 0.14 mA·cm−2 and a high responsivity up to 7.3 mA·W−1 was achieved at 340 nm.
研究领域:
材料科学
·
纳米技术
·
光子学
·
电气工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Kun Bai,Ruosheng Zeng,Bao Ke,Sheng Cao,Xiaogang Xue,Rihui Tan,Bingsuo Zou
Doping has been established as a powerful approach for endowing novel properties to perovskite nanocrystals (NCs).However, the fast formation of perovskites makes the fundamental understanding of doping processes in these NCs very rare. In the present work, a mild temperature (<100 °C) approach to produce Mn 2+ doped CsPbCl 3 (Mn:CsPbCl 3 ) perovskite NCs in toluene is reported. The effects of the introduced Mn/Pb ratios in the raw materials as well as the temperature on the structure and photoluminescence (PL) properties of Mn:CsPbCl 3 NCs were investigated systematically. The as-synthesized Mn:CsPbCl 3 NCs shown a strong Mn 2+ emission at 594 nm with a PL quantum yield (QY) of 52%, and the doping concentrations can be easily tailored from 1.8 atom % to 13.3 atom % by changed the Mn/Pb feed ratios. The study revealed that the reaction temperature plays a key role in Mn:CsPbCl 3 NCs. Through elemental and microstructure characterization , it was surprisingly found that lattice ejection of Mn ions occurred at 100 °C. This result greatly enhances the understanding of the “basic process” of Mn 2+ doping in CsPbCl 3 NCs, which provides some insights into the preparation of metal ion doped perovskite NCs.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Advanced Science
·
2024
·Vol. 12
·期 4
·2408927
·
IF 14.3
Xiaochen Fang,Zhuo Chen,Mandy Hei Man Leung,Biao Zheng,Liwei Wang,Meng An,Yusuke Asakura,Yusuke Yamauchi,Zhanhui Yuan
Rare-earth-doped all-inorganic perovskite applications for near-infrared (NIR) emission are crucial for the construction of the next generation of intelligent lighting sources. However, the preparation of rare-earth-doped all-inorganic perovskite is complex, and difficult to control, and the issue of thermal quenching poses significant challenges to its practical application. Here, in order to address these issues, a convenient photo-induced synthesis method for CsPbCl 3 :Mn/Yb nanocrystals (NCs) is proposed by decomposing carbon tetrachloride with 365 nm light to provide chloride ions and regulate the formation of perovskite at room temperature. The negative thermal quenching in the NIR emission is achieved through the energy transfer between Mn and Yb. The emission intensity of Yb enhances 3.2 times when the temperature rises to ≈427 K. Furthermore, with the help of the orange emission from the Mn 2+ ions and the NIR emission from the Yb 3+ ions, visible to NIR light emitting diode (LED) devices are constructed and applied in orange light illumination and night vision imaging. This study enriches the preparation methods and chemical research on perovskite doping, which may open up new opportunities for the widespread application of perovskite-based materials or device engineering.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Xingyue Liu,Xingsheng Wang,Guojun Wen
The emerging wide-bandgap CsPbCl₃ perovskite has drawn tremendous attention in ultraviolet (UV) detection application. Nevertheless, the massive internal and surface defects in CsPbCl₃ polycrystalline films are harmful for the detector performance and stability. Hence, an organic triphenylphosphine oxide (TPPO) doping strategy for passivating CsPbCl 3 defects is developed for the first time, in which the TPPO doping is completed by vapor technique. The P = O group in TPPO can form strong P = O-Pb dative bonds with the uncoordinated Pb 2 + ions in CsPbCl 3 perovskite by donating lone electron pair on O atoms, thus passivating the Cl vacancy defects existing in the evaporated CsPbCl₃ films. After TPPO doping, the crystallization process, film morphology, optical absorption ability and carrier lifetime are ameliorated, while the trap state density of the CsPbCl 3 film are pronouncedly alleviated. This conduces to a more efficient carrier extraction as well as declined charge recombination and noise current, further boosting the overall UV detection parameters. The optimized 12 nm TPPO-doped CsPbCl 3 photodetector obtains a detectivity of 7.68 × 10 12 Jones, a current on/off ratio of 5.08 × 10⁵, and a response time of 2.16 μs at 0 V bias. Furthermore, TPPO-doped device achieves superior stability under long-term continuous or intermittent UV irradiation in ambient environment. This work proposes an efficient approach for defect passivation of hardly soluble CsPbCl 3 perovskite, boosting its commercial development in UV detection field.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 9
·1803-1811
·
IF 3.756
Kaiwen Hu,Yongfei Hu,Tan Li,Fen Qiao,Yunxia Chen,Jianjun Han,Lee Li,Ghafar Ali,Yi Xie
Doping Mn2+ ions into lead halide perovskite (LHP) nanocrystals (NCs) has attracted great attention in the optoelectronic fields due to the stability enhancement and unique dual-color emission characteristics arising from the energy transfer from the LHP host to the dopants (i.e., Mn2+ ions). Herein, we report a facile and scalable synthetic protocol for Mn2+-doped CsPbCl3 and CsPbBrxCl3−x nanoplates via a one-pot room-temperature (RT) procedure in the presence of hexamethyldisilazane (HMDS). It is noteworthy that both HMDS and Mn2+ ions play a critical role in triggering the crystallization of the Mn-doped LHP NCs under ambient conditions by functioning as a passivation agent with Lewis base groups that coordinate with Pb2+ ions. The optical properties including the emission wavelength and the relative PL intensity of the band-to-band emission and the Mn2+ emission are tuned by changing the amount of HMDS and the precursor ratios Mn : Pb and Br : Cl. It is interesting that the representative Mn-doped CsPbCl3 NCs displayed enhanced thermal stability, which was confirmed by the observation that the emission intensity of the sample annealed below 95 °C for 2 h increases compared with that of the fresh sample. Ion exchanges between not only Cl−, Br− and I− but also Mn2+ and Pb2+ are also investigated.
研究领域:
材料科学
·
光电子学
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）