CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yongmin Duan,Shugang Li,Keyi Gu,Zhaojing Kuang,Juan Du,Junjie Zhang
Scalable and passive surface passivation strategies are essential for improving the durability and performance of perovskite quantum dot (PQD) glass materials , making them suitable for real-world optoelectronic technologies. In this study, we report a spontaneous, water-assisted surface evolution process in CsPbBr 3 PQD glass, where ambient moisture induces the gradual formation of PbBr(OH) nano-phases on the glass surface over a period of four years. This self-grown passivation layer effectively enhances the material's photoluminescence performance, boosting the photoluminescence quantum yield from 20 % to 93 % without any external treatment. Detailed structural, optical, and spectroscopic analyses confirm that the PbBr(OH) phase mitigates surface defects and suppresses non-radiative recombination. Density functional theory calculations suggest that the wide bandgap of PbBr(OH) nano-phases helps confine charge carriers within the CsPbBr 3 PQDs, further enhancing luminescence efficiency. The resulting PQD glass demonstrates remarkable stability against air, thermal, and UV exposure, making it ideal for long-term applications in solid-state lighting and other optoelectronic systems. This work offers a cost-effective, passive, and potentially scalable method for improving the performance of perovskite-based materials, with significant implications for their integration into durable and high-performance devices.
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Advanced Optical Materials
·
2026
·
IF 7.2
Ou Hai,Keke Guan,Hang Li,Peng Li,Zhanying Bai,Jiaxin Qin,Yuanting Wu,Xin An,Weikang Dong
All-inorganic perovskite quantum dots (PQD) have become the most promising next-generation luminescent material due to their excellent luminescent properties. However, as an ionic crystal, their stability is the biggest problem for their large-scale application. Especially, it is a huge challenge to use them in water or at high temperatures. This study proposes a strategy for the simultaneous synthesis of CsPbBr 3 quantum dots and silica aerogels (SiO 2 AG). During the formation of the aerogel network, the quantum dot precursor solution is confined within nanoscale silica aerogel “microcapsules”; upon heating, the quantum dots undergo nucleation and growth within these “capsules”, simultaneously completing the synthesis and protection of the quantum dots. The experimental results show that the photoluminescence properties of CsPbBr 3 quantum dots and SiO 2 aerogel （CsPbBr 3 @SiO 2 AG) Composites material prepared by this method remain unchanged after heat treatment at 400°C for 8 h, and the photoluminescence quantum yield (PLQY) can reach 99.1%. Even after direct immersion in water and natural evaporation, the luminescent properties remain above 39%, and the precipitation of Pb 2+ is effectively inhibited. This material provides strong support for the large-scale application of perovskite quantum dots, especially in various emerging fields under extreme conditions.
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TALANTA
·
2023
·
IF 6.1
Yan Wang,Jin Shen,Ruilong Song,Qin Xu,Xiaoya Hu,Yun Shu
Rapid and highly sensitive detection of tumor marker (TM) is critical for the early diagnosis and treatment of cancers. Herein, utilizing highly bright and water-stable CsPbBr 3 perovskite nanocrystals (NCs) capped with amphiphilic polymer ligand of octylamine-modified polyacrylic acid (OPA) and gold nanoparticles (AuNPs) as reporters, a lateral flow immunoassay (LFIA) strip is developed for fluorescence and colorimetric dual-mode detection of carcinoembryonic antigen (CEA). The prepared CsPbBr 3 NCs capped by an amphiphilic polymeric of OPA ligand showed high stability and bright fluorescence. Moreover, the AuNPs immunoprobes were captured with CEA antigen and quench the green fluorescence of CsPbBr 3 /OPA NCs on the T line due to the inner filter effect (IFE). Therefore, CEA could be quantitative analyzed by the dual-readout of fluorescence and colorimetric signal. The detection limits of CEA can reach as low as 0.023 ng/mL and 0.027 ng/mL for the fluorescence and colorimetric mode, respectively. Good specificity and reproducibility were also demonstrated for this method. Finally, the CsPbBr3/OPA NCs-based LFIA showed good accuracy in detection of CEA level from clinical serum samples. This work firstly enables the application of CsPbBr 3 perovskite NCs in a LFIA, displaying great potential in point-of-care clinical diagnosis.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Tianyu Zhao,Deyang Li,Yiyan Zhang,Guanying Chen
Lead halide perovskites are promising for photocatalysis due to their excellent optoelectronic properties, high extinction coefficients, and long electron-hole diffusion lengths. However, severe recombination of photogenerated carriers limits their photocatalytic activity. Herein, we describe a perovskite-based step-scheme (S-scheme) heterojunction by interfacing CsPbBr 3 perovskite nanocrystals with sulfur (S) doped graphitic carbon nitride (g-C 3 N 4 ) ultrathin nanosheet. The formation of S-scheme heterojunction was substantiated by in-situ x-ray photoelectron spectra, showing a negative shift for Cs 1s, Pb 4f, and Br 3d binding energy in CsPbBr 3 , while a positive shift for C 1s, N 1s, and S 2p in S-doped g-C 3 N 4 upon light irradiation. Moreover, alignment of Fermi levels in both semiconductors results in constructing a built-in electric field in the heterojunction, which enhances S-scheme electron transfer from g-C 3 N 4 to CsPbBr 3 , favorable for electron (CsPbBr 3 ) and hole (g-C 3 N 4 ) separation for enhanced carbon dioxide (CO 2 ) photoreduction. Indeed, compared with CsPbBr 3 , the developed CsPbBr 3 /S doped g-C 3 N 4 composite showed a ∼16-fold improvement in the photocatalytic CO 2 reduction rate (∼83.6 μmol h −1 g −1 ), thus holding great potential for photocatalysis applications in environmental and energy fields.
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PubMed
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Hong Zhu,Zhichao Liu,Chenbo Xu,Caiqi Chen,Jinxuan Wen,Keqin Yang,Suqin Chen,Yuexiao Pan
With unique electronic and optical properties , the size and luminescence color of metal halide perovskite nanocrystals CsPbBr 3 (CPB) are crucial for the potential applications including solid-state lighting, photovoltaics , and thermoelectrics . In this work, we have developed a viable design strategy toward cubic CPB nanoplatelet (NPs) with blue emission at 450–467 nm and a large red shift to the green region at 500–512 nm occurs through a cooperative effect of the ligands 4 -bromo-butyric acid (BBA) and oleylamine (OLA). The influence of the molecular ratio of BBA/OLA, reaction time and temperature on the transformation from blue to green has been investigated systematically. The red shift in the PL of CPB NPs is ascribed to the growth of the crystals with decreased quantum confinement. The photoluminescence quantum yields (PLQYs) of the blue and green luminescence of the obtained CPB NPs reach 94.4 % and 84.4 %, respectively. This proposed strategy not only experimentally fabricates size-adjustable CPB NPs but also helps to reveal in depth the mechanisms of the large variation of quantum confinement in pure cubic CPB NPs.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Shuaichen Si,Jinbo Yu,Sunqi Lou,Bang Lan,Jinhui Zhang,Xuejie Zhang,Man-Rong Li,Lin Huang,Jing Wang
The in-situ growth of CsPbBr 3 perovskite quantum dots (QDs) inside glass has been regarded as an alternative approach to improve their stability. Alkaline-earth metal oxides has multiple effects on the structure of the glass network. Herein, four types of alkaline-earth metal oxides are introduced into borosilicate glasses to modulate glass network structure, which has quite different effects on the crystallization behavior of CsPbBr 3 QDs. The reason can be ascribed to the different impacts of alkaline-earth metal on phase separation, nucleation, and growth procedure. Moreover, CsPbBr 3 QDs embedded in glass (CsPbBr 3 QD@glass) exhibit superior thermostability and photostability compared with CsPbBr 3 QDs powder. Finally, a white light-emitting diode achieving 124% of National Television System Committee (NTSC) gamut is fabricated using the CsPbBr 3 QD@glass, K 2 SiF 6 :Mn 4+ phosphor film, and blue chip-on-board. This work provides a reference for modulating the glass network modifiers to regulate the crystallization behavior of perovskite QDs.
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JOURNAL OF LUMINESCENCE
·
2021
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IF 3.599
Cen Zhang,Xiaonan Zhu,Fei Gao,Liu Yang,Weizhen Liu
The development of wavelength adjustable electrically driven panchromatic display light-emitting devices (LEDs), a future direction for lighting sources, still seems necessary because of great development prospects and practical significance. Herein, perovskite quantum dots (QDs) of CsPbBr 3 and CsPbI 3 with multi-color luminescence feature were employed into n-ZnO/p-GaN nano-heterojunction LEDs. A thin polystyrene cover layer was intentionally inserted between CsPbBr 3 and CsPbI 3 to prevent the undesired halogen anion-exchange reaction. A color-tunable electroluminescence (EL) could be achieved by changing the molar ratio of these two types of perovskite QDs. By further optimizing the molar ratio between CsPbBr 3 and CsPbI 3 , that is, the evolution of the share of red, green and blue-violet luminescence in EL spectra, a stable white light emission was obtained. The current research not only achieves multi-color EL emissions in a three-dimensional nano-architecture, but also proposes an effective and clever strategy for preparing and developing single-chip white LEDs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jialong Duan,Chenlong Zhang,Yueji Liu,Qiaoyu Zhang,Jie Dou,Qiyao Guo,Xiya Yang,Qunwei Tang
Electron cloud density around the functional group of Lewis-base molecule (passivator) highly determines the interaction strength with undercoordinated Pb 2+ in perovskite film. With the aim to maximize this scenario, herein, we fabricate a thermally-activated delayed fluorescence molecule (3,4,5,6-tetrakis(3,6-diphenylcarbazol-9-yl)-1,2-dicyanobenzene, 4CzPN-Ph) bound CsPbBr 3 nanocrystal (NC) to heal the defective perovskite surface. Because of the suitable energy alignment, there is a Förster or Dexter triplet energy transfer process from CsPbBr 3 NC donor to 4CzPN-Ph acceptor under light irradiation, leading to the increased electron density within 4CzPN-Ph molecule and thus the enhanced passivation ability. Together with the formation of compositional gradient layer owing to the halide exchange reaction with CsPbBr 3 NCs, the stable perovskite film with reduced defect is obtained, consequently promoting the efficiency up to 11.60 % for CsPbIBr 2 and 14.44 % for CsPbI 2 Br carbon-based devices, with excellent durability under harsh conditions.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 3
·2308341
·
IF 19
Mingyang Li,Jindi Wang,Jisong Yao,Shalong Wang,Leimeng Xu,Jizhong Song
Although significant progress has been made in improving the external quantum efficiencies (EQEs) of perovskite quantum dot (QD) light-emitting diodes (QLEDs), understanding the degradation mechanism and enhancing stability remain a challenge. Herein, increasing the content of Br-based passivation ligands is shown to enhance the EQE up to 16.1% by reducing the defects of CsPbBr 3 QDs in a Br-rich environment. However, the operational lifetimes of perovskite QLEDs gradually decrease with the increase of halide content, owing to the intensified ion migration under continuous electric field confirmed by the current behavior of QLEDs and time-of-flight secondary-ion mass spectrometry. Furthermore, a thorough analysis of the relationship between electricity and luminance of QLEDs suggests that a small amount of residue oleic acid ligands could weaken ion migration. Accordingly, a halide- and acid-hybrid (HAH) co-passivation strategy is proposed to optimize the content of Br- and acid-based ligands, and achieve a maximum EQE of 18.6% and an operational lifetime ( T 50 , extrapolated) of 213 h for CsPbBr 3 QLEDs. This approach for passivating QDs combines the high efficiency of Br-based ligands with the improved stability of acid-based ligands. The study elucidates the correlation between ligands and device performance, highlighting the significance of two or even multiple ligands for efficient and stable perovskite QLEDs.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jidong Deng,Jiao Xun,Wei Shen,Ming Li,Rongxing He
Inorganic metal halide perovskites are generally considered as highly attractive materials for optoelectronic application devices. Unfortunately, Pb-based perovskite nanocrystals (NCs) are unstable because of their sensitivity to water, oxygen, light, and thermal treatment, which seriously limits their practical application. Herein, the dual-phase CsPb2Br5/CsPbBr3 NCs were synthesized first, and then the dual-phase M2+-doped CsPb2Br5/CsPbBr3 NCs (M = Ca2+, Sr2+, and Ba2+) with low toxicity were simply and rapidly prepared at room temperature based on the CsPb2Br5/CsPbBr3 NCs. The Sr2+-doped samples show outstanding stability and photoluminescence quantum yield due to the elimination of structural distortion and lattice contraction caused by the almost equal radii of Sr2+ (1.18 Å) and Pb2+ (1.19 Å). Interestingly, with the increase in M2+ concentration, the dual-phase quasi-2D tetragonal CsPb2Br5/CsPbBr3 NCs gradually transformed into single-phase 3D cubic Cs(Pb/M)Br3. These high-performance perovskite luminescent materials are expected to be used in light-emitting devices and other optoelectronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ziyao He,Xiaojuan Liang,Weidong Xiang
All-inorganic halide perovskite nanocrystals (NCs) have become the most promising next generation luminescent materials due to their excellent properties. However, there are many nonradiative recombination defects in colloidal perovskite NCs, which reduce their luminescent efficiency and stability. In this work, we incorporated the alkaline-earth (AE) metal ion Ca 2+ into NCs to further improve the photoluminescence quantum yield (PLQY) of CsPbBr 3 and CsPbBr 1 I 2 NCs. The PLQY of green-emitting CsPbBr 3 and red-emitting CsPbBr 1 I 2 NCs can be boosted to 72.3% and 78.7%, respectively by doping the optimum amount of Ca 2+ . At the same time, we adopted a simple and low-cost one-pot method to integrate Ca 2+ -CsPbX 3 (X 3 = Br 3 , Br 1 I 2 ) NCs and superhydrophobic silica aerogels (AG), not only retaining the high PLQY of NCs, but also greatly improving the water, heat and light stability. Finally, the green-emitting Ca 2+ -CsPbBr 3 @AG, red-emitting Ca 2+ -CsPbBr 1 I 2 @AG composites and the blue chip as the light sources show a wide color gamut that accounts for 129% of the NTCS 1953 value and nearly 100% of the Rec.2020 value. Additionally, we fabricated white light-emitting diode (WLED) devices by coupling Ca 2+ -CsPbBr 1 I 2 @AG composites with commercial YAG:Ce 3+ phosphors on blue chips, obtaining bright white light with a color rendering index (CRI) up to 92.2.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xingyu Liu,Jinwei Gao,Qianming Wang
The low resistance to moisture will be the main obstacle for the perovskites used in device package and solar cell application. Most of literatures refer to the route that the quantum dots should be incorporated into a wide variety of stabilized hosts. However, the generation of protecting layers requires complicated treatments and decreases solubility or dispersity. Moreover, morphological control of perovskite nanocrystals with the assistance of covering substrate is a big challenge. Self-assembly of colloidal nanocrystals into ordered architectures has caused considerable interests and enabled new ways to manipulate the physicochemical properties for targeted applications. Herein, we describe how inorganic halide perovskites (CsPbBr 3 ) with five different shapes (cubic, dot, sheet, ring and complex-coated) are formed by adjusting the sequence of PbBr 2 , 2-mercapto-3-methyl-4-thiazoleacetic acid (MMTA) and water. Realization of long-term stability and high efficiency requires innovative designs in both internal chemical structure and external interface engineering. PbBr 2 improves the ionic nature of CsPbBr 3 due to its cation supplement strategy. MMTA plays an important role in cross-linking process and the hydrogen bond/coordination interactions can passivate the interfacial surface for optimizing the microstructure. Water is not always detrimental in producing irreversible degradation. The shape evolution from the individual particles into much extended structure leads to the formation of complex-coated- CsPbBr 3 (CC- CsPbBr 3 ). It can retain 40% of its original emission intensity in water for 36 h, whereas the typical cubic CsPbBr 3 exhibits poor performance during water tolerance experiments and has been completely quenched within 12 h. A wide color gamut system with 153% of National Television System Committee (NTSC) space is developed for CC- CsPbBr 3 .
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