Nanomaterials
·
2023
·Vol. 13
·期 9
·1540
·
IF 5.3
Jia-Xin Wang,Chang Liu,Hao Huang,Rui He,Shengyong Geng,Xue-Feng Yu
The superior optical properties of lead-halide perovskites (LHPs) inspired significant research in cell imaging applications; many encapsulating processes have improved perovskite stabilities with comparable biosafety. Herein, facile solvent evaporation encapsulation based on an oil-in-fluorine emulsion for aqueous-stable and extremely nontoxic LHP microcapsules is described. Perfluorooctane dispersed the emulsifier fluorocarbon surfactant to form a continuous fluorine phase, while LHPs and polymethylmethacrylate (PMMA) were dispersed in 1,2-dichloroethane, then emulsified in the fluorine phase to form an oil-in-fluorine emulsion. CsPbBr3microcapsules with a dense PMMA shell that protect fragile CsPbBr3from the external environment and inhibit lead ion release were obtained after solvent evaporation. The CsPbBr3microcapsules not only retained 91% of fluorescence intensity after exposure to water for 30 d but also possess extremely low cytotoxicity for MCF-7 cells. After exposure to 2 mg/mL of CsPbBr3microcapsules for 48 h, the cell viability remained >90%. The intracellular uptake of CsPbBr3microcapsules indicates its potential use in cell imaging.Keywords:lead-halide perovskites;microencapsulation;oil-in-fluorine emulsion;cell imaging
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 9
·期 2
·2200918
·
IF 7.633
Xingjie Lv,Guoliang Yuan,Tom Wu,Zhibo Yan,Ben Xu,Guanghua Liu,Jun-Ming Liu
Recently lead halide perovskite based solar cells have rapidly advanced and their power conversion efficiency (PCE) increased to 25.7%. The progress has been attributed to the super-long carriers’ lifetime (τ) and long diffusion length ( L D ) of the photocarriers, however it has been a challenge to precisely characterize and understand the super-long τ and L D of photocarriers. Here, a MAPbI 3 single crystal exhibits four different τ which increase with L D extending from nm scale to mm scale. The prior two lifetimes estimated by transient photoluminescence (TPL) spectra are in the range of ns which comes from the recombination of photocarriers in the tens of nm thick surface layer. In contrast, the third lifetime estimated by transient open-circuit voltage is hundreds of µs, which is a result of the excess photocarriers diffusing hundreds of µm to electrodes. Finally, the fourth lifetime estimated from the transient photoconductance is as long as sub-second since the low-density photocarriers under an electric field drift across the mm-scale high-quality single crystal. This study not only clarifies the physical mechanisms of four different lifetimes of photocarriers but also facilitates the design of novel electronics with the halide perovskite semiconductors.
研究领域:
材料科学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Chunhua Luo,Sihui Huang,Ting Zhang,Chunli Jiang,Ruijuan Qi,Mengqin Liu,Hechun Lin,Jadranka Travas-Sejdic,Hui Peng
Lead halide perovskites (LHPs) are very promising for new optoelectronic devices due to their excellent optical and electronic properties. However, the poor stability against water, heat and UV light greatly restricts their practical applications. In this work, a CH 3 NH 3 PbBr 3 /silicon oil/PDMS-urea composite is prepared by encapsulating CH 3 NH 3 PbBr 3 nanocrystals and silicon oil into the PDMS-urea polymer matrix . This composite shows characteristics of water-enhanced photoluminescence (PL) and water-driven PL recovery. After immersed in water, the photoluminescence quantum yield of the composite increases from initial 26.0%–52.2%, which is ascribed to the passivation of surface defects by the capping of polymer chains, H 3 O + and OH − . The composite possesses superior stability against UV light illumination in water. Furthermore, the composite film exhibits a capability of water-driven PL recovery after UV light irradiation. By applying alternate water/UV treatments, the PL can be reversibly switched “on and off”. The “on/off” ratio value of the PL intensity reached more than 4. These advantages make this composite highly promising in applications utilising luminescent switching and for under water lighting.
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
Fundamental Research
·
2022
·
IF 0
Weinan Xue,Xin Zhang,Wei Zhu,Xue Zhang,Wei Wang,Linwei Peng,Xiang Ma,Yan Li
Colloidal lead halide perovskite nanocrystals (LHP NCs) are promising semiconductor materials for optoelectronic devices, but the high ionicity of LHP NCs makes their crystallization control and post-treatment difficult. Here, phosphonic acids (PAs) are employed as ligands to design a solid-liquid heterogeneous reaction system to regulate the LHP NC crystallization and achieve the desired focusing growth. During the heterogeneous synthesis, the precursors in the liquid phase are responsible for the burst nucleation and initial growth of NCs. Afterwards, the focusing growth of NCs is supported by the precursors released from the solid phase. In addition, the strong binding ability of PAs enables effective passivation of LHP NCs. Without post-treatment, gram-scale monodisperse CsPbBr 3 NCs having photoluminescence with a full width at half-maximum of 18 nm and a quantum yield of near-unity are obtained. The CsPbBr 3 NCs covered by a compact ligand layer keep initial quantum yield even after 18 cycles of purification , exhibiting excellent stability against polar solvents , ultraviolet irradiation and heat treatment. As scintillators , the prepared CsPbBr 3 NCs show strong radioluminescence emission and high-resolution X-ray imaging.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
CRYSTENGCOMM
·
2022
·Vol. 24
·期 38
·6777-6785
·
IF 3.756
Ling Li,Hao Dong,Yongfei Hu,Tao Zeng,Yunxia Chen,Kwadwo Mensah-Darkwa,Emmanuel Tsiwah Acheampong,Ghafar Ali,Yi Xie
Although lead halide perovskite (LHP) nanocrystals (NCs) are considered propitious materials due to their extraordinary optoelectronic properties, the scalability of synthesis and poor ambient stability hinder their commercial applications. Herein, we develop a facile and universal room-temperature (RT) protocol for the synthesis of red-emitting all-inorganic CsPbBr3−xIx perovskite NCs by the mediation of capping ligands. The emission wavelength can be tuned in the range of 598–651 nm by tailoring the PbBr2 : PbI2 precursor ratios and the amounts of ligands. Interestingly, the introduction of ligands such as 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA) heavily improves the stability of the as-synthesized NCs against water, heat stress and UV irradiation, which is due to surface passivation. This work offers a reliable and scalable reference for tuning red-emissive perovskite NCs with improved environmental stability, which will accelerate their commercial application process in optoelectronic fields.
研究领域:
材料科学
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纳米技术
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光电学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Jiang Yilin,Xi Ruonan,Yin Jinlin,Sun Chen,Li Yukong,Wu Chao,Zhang Chi,Fei Honghan
Three-dimensional lead halide hybrids exhibit excellent photophysical properties but suffer from inherent instability. In contrast, two-dimensional layered lead halides offer enhanced environmental stability, yet their strongly bound excitons restrict efficient charge transport. Here we present a covalent intercalation strategy involving the benchmark photosensitizer [Ru(bpy) 3 ] 2+ into a layered lead halide framework, featuring cationic [Pb 23 X 42 ] 4+ (X − = Cl − or Br − ) layers pillared by [Ru(bpy) 3 ] 2+ ligands via Pb 2+ -carboxylate coordination. This hybrid material achieves nearly full visible-light absorption and efficient photoinduced charge transfer from [Ru(bpy) 3 ] 2+ to the lead halide layers. This affords efficient CO 2 -to-CO photoreduction with an apparent quantum efficiency of ~3.0% at 500 nm, exceeding the performance of all previously reported organolead halide photocatalysts. Mechanistic studies indicate that the [Ru(bpy) 3 ] 2+ ligands enhance charge transport to Pb 2+ sites, facilitating CO 2 activation and reducing the reaction barrier for the *COOH intermediate. This work establishes a paradigm for intercalation chemistry in robust layered lead halide hybrids.
研究领域:
无机化学
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材料科学
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光催化
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环境科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
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2020
·
IF 6.71
Ziren Zhou,Shuang Yang,Kaixuan Xu,Hong Wei Qiao,Jin Xie,Zeqing Lin,Bing Ge,Jingjing He,Mengjiong Chen,Jun Zhang,Yu Hou,Hua Gui Yang
The insertion of organic spacers into halide perovskite slabs has offered a trade-off between the efficiency and stability of perovskite solar cells (PSCs). The layered structure of diammonium-intercalated cesium lead halide perovskites is virtually unexplored, in contrast to several works on the monoammonium system. In this report, we find that perovskite with 1,4-butanediammonium (BDA) and cesium cations can only form n = 1 and n = 2 layered isologues defined by the chemical formula of (BDA)Csn–1Pbn(I0.7Br0.3)3n+1, while the n = 3–4 ones will self-construct into unique heterostructures comprising separated quantum wells (QWs; n = 1–2) and 3D (n = ∞) perovskites. We highlight that the 2D/3D heterostructures show a structural resemblance to that of bulk heterojunction in organics, thus improving the charge separation and transport more than surface passivation. Solar cells based on the (BDA)Cs3Pb4I9.1Br3.9 (n = 4) absorbing layer delivered a power conversion efficiency (PCE) reaching 9.49% with ideal light and thermal stability.
研究领域:
材料科学
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光伏技术
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纳米技术
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固体物理
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化学合成
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Zhaoyan Yang,Jingkun Xu,Shenfei Zong,Shuhong Xu,Dan Zhu,Yizhi Zhang,Chen Chen,Chunlei Wang,Zhuyuan Wang,Yiping Cui
Lead halide perovskite nanocrystals (NCs) are promising optical materials in many fields. However, their poor moisture stability, significant toxicity, and difficulty to be further functionalized greatly hinder their applications in bioimaging. Here, a universal strategy is demonstrated by simply encapsulating CsPbX3 (X = Cl, Br, I) NCs into phospholipids to achieve CsPbX3–phospholipid micelles (CsPbX3@phospholipid) as probes for multiplex encoding cellular imaging or tumor-targeted imaging. The layer of phospholipids endows CsPbX3 NCs with superior water-resistant characteristics, the ability to be further biofunctionalized, and greatly improved biocompatibility. The CsPbX3@phospholipid micelles exhibited strong luminescence with narrow fwhm in water for more than four months. Specifically, even after being modified with folic acid, the bright fluorescence of the micelles was well retained, which were employed for the targeting of Hela cells. Finally, the greatly reduced toxicity of the CsPbX3@phospholipid micelles was verified using HeLa cells and zebrafish as in vitro and in vivo models, respectively.
研究领域:
材料科学
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纳米技术
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生物医学工程
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生物成像
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癌症研究
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Zhang Yiyan,Zhao Tianyu,Deng Yuming,Liu Xinyue,Zhang Xiaorong,Zhu Tong,Ågren Hans,Chen Guanying
Lead halide perovskites serve as an important class of photoelectrical materials in modern technological applications, such as light emitting diodes, photodetectors, and solar cells. However, the inability to respond to near infrared light poses a tight constraint on their performances. This study reports a class of broadband near infrared-responsive inorganic lead halide perovskite nanocrystals, which emit a palette of tunable upconversion luminescence via organic dye-lanthanide tandem sensitization. The coordination of dyes (IR783) to the surface of ytterbium-doped cesium lead halide nanocrystals entails an intense and broad spectral response range of near infrared light (600-860 nm). Sub-10 Wcm −2 light irradiance at 804 nm induced ultrabright exciton luminescence (tunable from 520 to 625 nm), about 27,500 folds brighter than the one without dye sensitization, with upconversion brightness reaching 3.22 M −1 cm −1 . Transient absorption spectra revealed an ultrafast triplet energy transfer process (9.28 × 10 8 s −1 ) from dyes to ytterbium dopants with near-unity efficiency (98.4%), followed by cooperative sensitization that excites delocalized excitons. These broadband near infrared-responsive inorganic perovskite nanocrystals have implications for applications ranging from solar cells to near infrared imaging and sensing.
研究领域:
材料科学
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光电子学
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纳米技术
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光子学
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能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2021
·
IF 6.475
Li Liu,Keliang Pan,Ke Xu,Xitian Peng,Jin Z. Zhang
Mn2+-doped amino lead halide molecular clusters (MCs) are synthesized using amine (e.g., n-octylamine, or butylamine) as passivating ligand and MnX2 (X = Cl or Br) as the Mn2+ doping source at room temperature. Their optical properties are investigated with UV–visible absorption, photoluminescence (PL), and PL excitation spectroscopy. The Mn2+ precursor plays a vital role in the synthesis of Mn2+-doped MCs. MnCl2 seems to facilitate the incorporation of Mn. The MnCl2 doping causes electronic absorption blue shift and leads to a spin-forbidden 4T1 → 6A1 Mn d-electron emission. With the help of time-resolved PL, Fourier transform infrared, and electron paramagnetic resonance results, a model is proposed to explain the formation mechanism. We suggest that Mn2+ doping replaces Pb2+ is assisted by Cl– ions that replace Br– ions. This study demonstrates the possibility of doping MCs and has important implications in gaining new fundamental insight into the growth mechanisms of perovskite nanostructures.
研究领域:
材料科学
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无机化学
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光学光谱学
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纳米技术
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凝聚态物理
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yifan Li,Xinmin Zhao,Ni Meng,Shuo Dong,Shan Yan,Man Yang,Changjiu Sun,Zhiqiang Li,Shaopeng Yang,Mingjian Yuan,Tingwei He
Mixed-halogen wide-bandgap (WBG) perovskite materials are employed in tandem solar cells (TSCs) due to their continuous tunability of bandgap. However, inhomogeneous halogen phases are often observed in bromine-rich perovskite films, which restricts the performance of WBG perovskite solar cells (PSCs) and TSCs. Here, homogeneous halogen-phase perovskite is proposed to form film by a synchronous halogen-phase transformation strategy. 1,3-Dimethyl-2-imidazolidinone (DMI) is introduced into the perovskite precursor solution, due to its stronger binding energy with lead halide (PbX 2 ). The homogeneous DMI-PbX 2 adducted intermediate phase is stable in precursor solution and at spin-coating stage. And it then synchronously transforms into a homogeneous halide-phase perovskite film at the annealing stage. Benefited from efficient carrier extraction and suppressed carrier recombination, the resulting 1.76 eV-bandgap PSC achieves a record power conversion efficiency (PCE) of 21.42% (certified 21.18%) among devices with a bandgap wider than 1.74 eV. Based on the high transmittance of semitransparent-WBG PSC, a 4-terminal all-perovskite TSC achieves a PCE of 29.66%.
研究领域:
材料科学
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光伏技术
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纳米技术
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能量转换
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薄膜技术
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太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）