European Physical Journal-Special Topics
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2025
·
IF 2.3
Zhang Yu,Wen Yunli,Dai Yuxiang,Li Guishun,Yun Junqiang,Jing Chengbin
The susceptibility to optical instability of perovskite nanocrystals (NCs) under ambient conditions is a serious hindrance for practical applications. The conventional SiO 2 coating method for enhancing stability suffered from long reaction times and complicated preparation procedures. In this study, a facile and convenient room-temperature one-pot approach was developed to fabricate CsPbBr 3 /SiO 2 NCs, which involves the addition of tetramethoxysilane (TMOS) in advance. Owing to surface passivation, the PLQY of the CsPbBr 3 /SiO 2 NCs increased to 90% from 70% of the primitive CsPbBr 3 NCs. The SiO 2 layer formed by the TMOS hydrolysis and condensation reactions also protect the CsPbBr 3 NCs from external environment stimuli. Compared with the pristine CsPbBr 3 NCs, the air stability, structural stability, polar solvent resistance, thermal stability, and UV resistance stability of the CsPbBr 3 /SiO 2 NCs are markedly enhanced. Also, the CsPbBr 3 /SiO 2 NCs can be used as green phosphors for white light-emitting diode (WLED), which exhibits a luminous efficiency of 40 lm/W.
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高影响因子
MOLECULES
·
2025
·Vol. 31
·期 1
·127
·
IF 4.6
Wenjun Chen,Rui Zhang,Xiaobo Hu,Jingsheng Ma,Duna Su,Chuanli Wu,Yanqiao Xu,Xiuxun Han
The poor stability of CsPbBr 3 perovskite nanocrystals (PNCs) caused by weak and dynamic ligand coordination severely limits their commercial applications. Herein, a dual-ligand synergistic modification strategy based on bromocarboxylic acids (BCAs) and oleylamine (OAm) was developed to mediate the surface structures and luminescent dynamics of CsPbBr 3 PNCs. The results reveal that carboxylate groups of BCA ligands modulate crystal growth, while its terminal Br atom forms a strong coordination with exposed Pb 2+ on the PNCs surface, which can effectively passivate lead- and bromine-related defects. The synergistic protection of OAm ligands enhances the stability of PNCs via amino-halide electrostatic interactions and steric hindrance effects. Notably, based on the relatively dense surface coating of 4-bromobutyric acid (BBA) and OAm dual-ligands, the prepared CsPbBr 3 PNCs exhibit a high photoluminescence quantum yield (PLQY) of 85.2 ± 2.4% and remarkable storage stability, retaining 90.2 ± 1.7% of their initial PL intensity after being stored for 63 days under ambient conditions. Furthermore, a prototype white light-emitting diode (WLED) fabricated with these PNCs displays a wide color gamut covering 122.1% of the NTSC standard and a luminous efficacy of 64.6 lm/W. This work provides a facile and feasible ligand engineering strategy to obtain highly stable and emissive PNCs.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mingxing Li,Xiaoge Wang,Xiaofan Cao,Chunjun Liang,Jing Ju,Fangtian You
Lead-halide perovskite (LHP) nanoparticles (NPs), such as CsPbBr 3 , exhibit exceptional luminescent properties, making them promising candidates for optoelectronic applications. However, maintaining their stability on solid substrates is challenging due to light and heat-induced degradation, even without water and oxygen. Although various post-processing methods aim to enhance stability, achieving this without compromising luminescence is difficult yet critical for practical devices. This study investigates the stability of monolayer CsPbBr 3 NPs under simulated light and thermal stress, identifying accelerated post-growth processes as the main instability source. To address this, we evaluated surface ligand post-treatments, including ultraviolet-ozone, plasma, and electron beam (e-beam) irradiation. Among these, low-dose e-beam irradiation proved most effective, significantly enhancing both luminescence and structural stability. Using correlative cathodoluminescence electron microscopy (CCLEM) and transmission electron microscopy (TEM), we established a dose-dependent relationship where optimal e-beam doses suppress nanoparticle growth and boost luminescence, while excessive doses degrade luminescence. Mechanistically, e-beam treatment forms a stable carbonaceous encapsulation layer on nanoparticle surfaces, preventing inter-particle contact and passivating surface impurities without causing significant structural damage. These findings demonstrate that low-dose e-beam irradiation is a versatile tool for tuning CsPbBr 3 NPs properties, offering new pathways to optimize the stability and performance of perovskite-based materials in advanced optoelectronic applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiong Zhao,Jianwu Wei,Jing Li,Xianli Li,Anxiang Guan,Peican Chen,Liya Zhou,Jie Tian,Jiahong Pan,Binbin Luo,Qi Pang
Advanced photocatalytic architectures for sustainable CO 2 reduction encounter two significant challenges involving severe electron-hole recombination and limited active sites. Herein, we synthesize a Z-scheme heterojunction composing of Mn-doped CsPbBr 3 nanoplatelets (Mn-CPB) and zinc phthalocyanine (ZnPc) via self-assembly. Mn 2 + doping in CsPbBr 3 induces spin polarization, creating spin-polarized hot electrons. These electrons transfer via the Z-scheme interface to ZnPc’s Zn 2+ center, thereby enhancing photocarrier separation and mobility and promoting CO 2 adsorption-activation. The heterostructure achieves an exceptional CO evolution rate of 15.17 μmol g −1 h −1 with 78.31 % selectivity, surpassing the performance of individual components under visible light. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations confirm the formation of key intermediates (•CO 2- ) during CO 2 adsorption and reduction. This work presents a strategy integrating spin regulation with interfacial band alignment, advancing perovskite-derived photocatalysts for solar-to-chemical conversion.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Chang-Qing Lin,Jun-Peng Deng,Zhe-Hui Lu,Zhen-Hua Liang,Yu-Ru Ling,Jun-Xi Liu,Wang Han,Chun-Yang Pan
Cu 2+ doped CsPbBr 3 PQDs with a PLQY of 91 % were synthesized via a continuous microfluidic approach. The precise regulation of flow rate and reaction temperature enabled fine control over the crystal size and structure. Time-resolved photoluminescence (TRPL) and transient absorption (TA) spectroscopy revealed picosecond-scale carrier recombination dynamics and distinct band-edge bleaching behavior in CsPb 0.89 Cu 0.11 Br 3 PQDs, confirming the effective defect passivation induced by Cu 2+ incorporation. Furthermore, flexible CsPb 0.89 Cu 0.11 Br 3 /PCL composite films exhibited an exceptional light yield of 21340 photons MeV −1 and a low detection limit of 82.5 nGy s −1 under X-ray excitation.
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高影响因子
Heliyon
·
2023
·
IF 4
Kai Huang,Feng Jiao Zhao,Wen Qiang Song,Chang Yuan Xu,Hong Ming Yin
Er 3+ has received extensive attention due to its excellent optical properties, especially its emission at 1535 nm in atmospheric propagation window. Enhancement and regulation of 1535 nm emission of Er 3+ is of great significance to optical communication. In this work, growing of CsPbBr 3 QDs has been controlled through adjusting annealing time which would precisely regulate conduction band of CsPbBr 3 QDs to match energy levels of Er 3+ enabling energy transfer between Er 3+ and CsPbBr 3 QDs. By steady-state and transient PL emission and excitation spectroscopy, we reveal multiple energy transfer processes between Er 3+ and CsPbBr 3 QDs under different excitation wavelengths in Er 3+ doped CsPbBr 3 QDs glass: under higher energy excitation (∼378 nm), energy transfer from Er 3+ to CsPbBr 3 QDs and this extra energy within CsPbBr 3 QDs decay via a non-radiative pathway; under lower energy excitation (∼524 nm), energy transfer from conduction band of CsPbBr 3 QDs to 4 S 3/2 energy level of Er 3+ which significantly enhances PL emission of Er 3+ in near infrared region (∼1535 nm, 4 I 13/2 → 4 I 15/2 ). These results provide a facile approach to enhance and regulate PL emission of Er 3+ in near infrared region.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 16
·1706567
·
IF 13.325
Xiaomei Chen,Feng Zhang,Yong Ge,Lifu Shi,Sheng Huang,Jialun Tang,Zhao Lv,Li Zhang,Bingsuo Zou,Haizheng Zhong
An HBr-assisted slow cooling method is developed for the growth of centimeter-sized Cs 4 PbBr 6 crystals. The obtained crystals show strong green photoluminescence with absolute photoluminescence quantum yields up to 97%. More importantly, the evolution process and structural characterizations support that the nonstoichiometry of initial Cs 4 PbBr 6 crystals induce the formation of nanosized CsPbBr 3 nanocrystals in crystalline Cs 4 PbBr 6 matrices. Furthermore, high efficiency and wide color gamut prototype white light-emitting diode devices are also demonstrated by combining the highly luminescent Cs 4 PbBr 6 crystals as green emitters and commercial K 2 SiF 6 :Mn 4+ phosphor as red emitters with blue emitting GaN chips. The optimized devices generate high-quality white light with luminous efficiency of ≈151 lm W −1 and color gamut of 90.6% Rec. 2020 at 20 mA, which is much better than that based on conventional perovskite nanocrystals. The combination of improved efficiency and better stability with comparable color quality provides an alternative choice for liquid crystal display backlights.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Tiancheng Xu,Zhiheng Xu,Yong Chen,Dandan Yang,Zongyan Dong,Jinkai Yang,Xiaobin Tang
A water-triggered green synthesis strategy is developed for CsPbBr 3 nanocrystals. • Multidentate ligand anchoring induces Pb–O dominated surface coordination. • Surface coordination reconstruction effectively passivates undercoordinated Pb sites and suppresses defect states. • The resulting nanocrystals exhibit enhanced stability under aqueous and irradiation conditions. Surface instability originating from highly reactive undercoordinated Pb sites poses a critical bottleneck for the practical deployment of CsPbBr 3 nanocrystals (NCs), especially under aqueous exposure and high-dose irradiation environments. Herein, we demonstrate a facile water-triggered strategy to fabricate ultra-stable CsPbBr 3 NCs, which relies on the Cs 4 PbBr 6 precursor transformation mediated by multidentate ligand synergistic anchoring. Specifically, the cooperative coordination of 4,4′-azobis (4-cyanovaleric acid) and oleylamine regulates the dynamic equilibrium between CsBr detachment and water-induced interfacial interaction, thereby realizing the in-situ construction of a Pb–O-dominated surface passivation layer on CsPbBr 3 NCs. Such a reconstructed surface configuration efficiently passivates undercoordinated Pb defect sites, inhibits defect generation, and reinforces the structural robustness of the perovskite lattice. Impressively, the as-obtained CsPbBr 3 NCs exhibit remarkable harsh-environment tolerance: they preserve 91.53% of the initial radioluminescence intensity after 2080 Gy γ-ray irradiation, and even display a boosted emission intensity during long-term aqueous storage. These results elucidate the critical function of water-mediated surface coordination chemistry in tailoring defect states of perovskite NCs, and offer a universal and feasible route to enhance the stability of CsPbBr 3 NCs under harsh conditions. Download: Download high-res image (166KB) Download: Download full-size image
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123736
·
IF 7.5
Hao Wang,Huifeng Deng,Shenghong Lai,Jiahui Li,Menghong Xie,Jiazhen Wei,Guihua Ruan,Yipeng Huang
In recent years, lead ion (Pb 2+ ) pollution control technologies have continued to advance. Among them, the adsorption method has shown promising application prospects. However, existing adsorption methods focus solely on Pb 2+ removal while neglecting the subsequent transformation and functionalization of the recovered Pb 2+ . To address these issues, thiol-functionalized covalent organic frameworks (COFs) were synthesized for recovery of Pb 2+ and confined conversion of Pb 2+ to CsPbBr 3 nanocrystals (NCs), an optoelectronic material. The effects of morphologies and surface chemistry of COFs on the adsorption efficiency for Pb 2+ were studied. The morphology tuning of COFs from spherical shape to flower shape with a myriad of humps on the surface boosted the adsorption efficiency for Pb 2+ from 25% to 85%. After thiol modification by 1,2-ethanedithiol, the adsorption efficiency of COFs for Pb 2+ increased by nearly 10-fold. The maximum adsorption capacity of thiol-functionalized COFs for Pb 2+ was 54.3 mg·g −1 . The adsorption isotherm was best described by the Langmuir model. Utilizing the mesopore-confined effect of COFs, the enriched Pb 2+ were converted into CsPbBr 3 NCs. The CsPbBr 3 NCs confined in COFs exhibited excellent stability and could generate singlet oxygen ( 1 O 2 ) under the irradiation by xenon lamp, revealing their potential applications in photocatalysis, bacteriostasis, light emitting diode and sensing. This work provides a prototype for both the removal and recycling of polluted Pb 2+ .
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高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Xiaoxia Feng,Yanli Qi,Juandi Cheng,Bo Wang,Jiacheng Liu
BODIPY-derived primary amine salts (BDPBr-nC) are innovatively adopted as co-ligands to one-pot fabricate high-purity CsPbBr 3 perovskite nanowires. • Bromine-rich BDPBr-nC interacts electrostatically with surface uncoordinated Pb 2+ to regulate nanowire growth, purify crystal phase, and passivate surface defects; short-chain BDPBr-3C further reduces steric hindrance and boosts charge transfer efficiency. • The optimized CsPbBr 3 -BDPBr-3C achieves efficient photocatalytic radical-tandem cyclization benefiting from matched energy level alignment, providing a viable surface ligand engineering strategy for high-efficiency perovskite photocatalysts. Lead halide perovskite nanowires (NWs) demonstrate considerable potential in photocatalysis due to their strong visible light absorption, tunable bandgap, and high photoconductivity. However, traditional ligands often desorb from the perovskite NW surface, generating the impure phase and abundant surface defects that severely hinder the separation and utilization of photogenerated carriers, thereby limiting catalytic efficiency. Herein, a series of BODIPY-based primary amine salts with varying carbon chain lengths (denoted as BDPBr-nC (n = 3, 4, 5, 6)) as co-ligands were employed to one-pot synthesize pure phase CsPbBr 3 NWs (CsPbBr 3 -BDPBr-nC). The enriched Br environment in BDPBr-nC enables electrostatic interaction with uncoordinated Pb 2+ on the CsPbBr 3 surface, effectively promoting the NWs growth and driving a phase transition from mixed phase to pure phase. This structural improvement facilitates efficient separation of photo-generated carriers in CsPbBr 3 NWs. Moreover, the shorter carbon chain in BDPBr-3C provides more favorable steric effects and enhanced conductivity, leading to superior defect passivation and charge transfer capabilities. Therefore, with CsPbBr 3 -BDPBr-nC as a representative catalyst, we achieved efficient photocatalytic radical-tandem cyclization of N-phenylmaleimide and N-phenylglycine in 1, 2-dichloroethane. Favorable energy level alignment among BDPBr-nC, CsPbBr 3 NWs, and the reactants promotes efficient electron transfer, resulting in excellent photocatalytic efficiency. This work highlights the promising potential of surface ligand engineering in enhancing both the stability and photocatalytic performance of perovskite nanowires. Download: Download high-res image (295KB) Download: Download full-size image
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高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Shuya Ning,Chi Zhang,Naming Zhang,Jin Huang,Kunping Guo,Tao Lei,Fanghui Zhang
Development of efficient fluorescence resonance energy transfer (FRET) is essential for application in optoelectronic and sensing technologies. In this work, we synthesized silica-coated silver nanoparticles (Ag@SiO 2 core-shell NPs) with different shell thicknesses and investigated their effect on a FRET system composed of CsPbBr 3 nanocrystals (NCs) and red dye 4-(Dicyanomethylene)-2-tert-butyl-6-[1,1,7,7-tetramethyljulolidin-4-yl-vinyl]-4H-pyran (DCJTB). Compared to the nanoparticle-free system, doping the CsPbBr 3 : DCJTB system with Ag@SiO 2 core-shell NPs of optimal shell thickness enhanced the fluorescence emission intensity to 3.5 times that of the nanoparticle-free FRET system and improved the FRET efficiency from 28% to 75%. Moreover, the Ag@SiO 2 NPs with the optimal shell thickness can more effectively enhance FRET efficiency than the bare Ag NPs. It is attributed to the fact that the Ag@SiO 2 core-shell NPs can simultaneously avoid quenching effect and effectively enhance the FRET efficiency through the plasmonic properties. This study provides an effective approach for designing highly efficient FRET system and offers a pathway for further enhancing the performance of optoelectronic devices.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ke Xing,Weibin Chen,Yusheng Song,Yijie Wang,Lei Song,Sihang Ji,Jialong Zhao,Xi Yuan,Yu Zhang
Surface treatment with NaBF 4 effectively reduces surface defects of CsPbBr 3 nanocrystals. • Anions in NaBF 4 replace original carboxylate ligands via strong coordination with surface cations. • NaBF 4 -treated CsPbBr 3 nanocrystals achieve high PLQY of 93.71% and good stability. • NaBF 4 -treated PeLEDs show CIE coordinates of (0.10, 0.73), meeting Rec.2020 standard. Surface defect passivation is critical for improving the luminescence performance and stability of CsPbBr 3 perovskite nanocrystals (NCs) toward high-performance perovskite light-emitting diodes. Herein, a facile and efficient room-temperature surface treatment strategy using NaBF 4 is proposed to synergistically enhance the optical properties and environmental stability of CsPbBr 3 NCs prepared via a modified ligand-assisted reprecipitation method. Through the strong coordination interaction between F atoms in BF 4 − anions and surface Pb 2+ ions, the weakly bound carboxylate ligands are replaced, effectively passivating surface defects without altering the cubic perovskite crystal structure. Consequently, the photoluminescence quantum yield is remarkably improved from 72.44% to 93.71%. Moreover, the treated NCs exhibit significantly enhanced thermal stability with PL intensity retention of 65.55% at 350 K, ethanol tolerance with 89.51% retention after 360 min, and photostability under continuous UV irradiation. PeLED devices based on the treated NCs achieve a maximum brightness of 7536 cd/m 2 and an external quantum efficiency of 6.50%, with emission centered at 514 nm and CIE coordinates of (0.10, 0.73) satisfying the Rec. 2020 ultra-wide color gamut standard. This work demonstrates that NaBF 4 surface treatment provides a practical and viable pathway toward high-performance and long-lifetime PeLEDs. Download: Download high-res image (148KB) Download: Download full-size image
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高影响因子
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