Advanced Optical Materials
·
2022
·Vol. 10
·期 10
·2102200
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IF 10.05
Chong Zhao,Yingkui Li,Wanggui Ye,Xiaofei Shen,Zicheng Wen,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
Colloidal all-inorganic lead halide perovskite nanocrystals (LHP NCs) feature with tunable high-efficiency photoluminescence from blue to red for optoelectronic applications but suffer from instability under water moisture, UV light illumination, high-temperature shock, as well as oxygen erosion. Previous work to improve LHP NCs stability was mainly focused on either glass bulk sealed LHP quantum dots (QDs) with low quantum efficiency, or mesoporous silica matrixes confined LHP QDs with organic ligands still existing. Here, a facile, noncolloidal, ligand-free LHP QDs growth with physical confinement is proposed by integrating the growth of perovskite QDs with the fabrication process of hydrophobic silica-aerogel powders (SAPs). As a result, the as-synthesized mono- and mixed-cesium-lead-halide QDs @ SAPs composites show tunable photoluminescence from purple to deep red. Besides, the Pr 3+ ions doped CsPbBr 3 QDs @ SAPs composites exhibit moderate quantum efficiency, excellent stability under UV illumination, water moisture as well as temperature variation. Furthermore, performances of white LED device encapsulated Pr 3+ doped composite with blue GaN chip and commercial red (Sr, Ca)AlSiN 3 :Eu 2+ phosphor are evaluated. This work demonstrates a facile and general strategy for synthesizing high-stable all-inorganic cesium-lead-halide QDs for applications in white LED and display devices.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chong-Yang Cui,Cai-Xia Li,Wen-Wu Liu,Yu-Cheng Liu,Sheng-Tao Niu,Zhi-Qiang Xu,Rong Zou,Wen-Jun Niu,Mao-Cheng Liu,Ming-Jin Liu,Bingni Gu,Kun Zhao,Na Liu,Chun-Jung Lin,You-Zhi Wu,Yu-Lun Chueh
Thermodynamically induced tensile stress in the perovskite film will lead to the formation of atomic vacancies, seriously destroying the photovoltaic efficiency stability of the perovskite solar cells (PSCs). Among them, cations and halide anions vacancies are unavoidable; these point vacancies are considered to be a major source of the ionic migration and perovskite degradation at the crystal boundary and surface of the perovskite films. Here, we use choline bromide to modify the perovskite film by occupying the atomic defects in the CsPbBr3 perovskite film. The results show that the zwitterion quaternary ammonium ions and bromide ions in choline bromide can simultaneously occupy the Cs+ cation and Br– anions vacancies in the perovskite film by the ionic bonding effect, for which the defect-state density on the surface of the perovskite film can be significantly reduced, leading to the effective enhancement of carrier lifetime. In addition, the residual stress at the crystal boundary can be effectively reduced by lowering the Young’s modulus in the CsPbBr3 perovskite film. As a result, the optimized device achieves a photoelectric conversion efficiency (PCE) of 9.06% with an increase of 41.1% compared to the control device with a PCE of 6.42%. Most importantly, the newborn thermal stress due to thermal expansion during heat working conditions can be transferred from the polycrystalline perovskite to the carbon layer by the matched Young’s modulus, thus resulting in improved stability perovskite film under environmental conditions. The work provides new insights for preparing high-quality perovskite films with low defect-state density and residual stress.
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Nano Energy
·
2019
·
IF 15.548
Hongling Guan,Shuangyi Zhao,Huaxin Wang,Dongdong Yan,Ming Wang,Zhigang Zang
White light emitting diodes (WLEDs) based on all-inorganic halide (CsPbX 3 , X = Cl, Br and I) perovskite quantum dots (QDs) have attracted broad attention due to their high brightness. However, their poor stability and anion-exchange reaction when utilized together are still the main challenges that impede their applications. Herein, a one-step in situ method under room temperature in air is proposed to synthesize CsPbBr 3 QDs coated with SiO 2 (CsPbBr 3 @SiO 2 ), where the whole process takes only 20 s. The as-prepared CsPbBr 3 @SiO 2 QDs samples present an enhanced stability in the thermal and polar-solvent environment, maintaining its high photoluminescence quantum yield (PLQY~75%). Thereby WLEDs are constructed by combining CsPbBr 3 @SiO 2 with red Ag–In–Zn–S QDs on InGaN blue chip, achieving a high color rendering index (CRI) of 91, a correlated color temperature (CCT) of 3689 K and a power efficiency of 40.6 lm W −1 .
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Chen Chang,Shixu Tao,Chang Xu,Yu Zhang,Wenxin Jiang,Yongge Cao,Chaoyang Ma
Colloidal CsPbX3 (X = Cl, Br, I) quantum dots (PQDs) typically suffer from severe degradation under heat, moisture, and UV/blue light irradiation, primarily due to the dynamic detachment and mismatch of surface ligands. Recently, ligand-free template-assisted strategies have emerged as an effective approach to address these challenges by regulating PQD growth through spatial confinement within nanoporous matrices. However, most reported systems are restricted to powder or thin-film forms and lack a robust, transparent, and device-compatible macroscopic architecture. In this work, we for the first time report a ligand-free in situ confined growth strategy for PQDs within a transparent nanoporous poly(methylsilsesquioxane) (PMSQ) xerogel monolith. The nanopores of the hydrophobic PMSQ template provide effective spatial confinement for the PQDs, which suppresses aggregation of PQDs and reduces nonradiative trap states, thereby enabling a high photoluminescence quantum yield exceeding 92% and excellent thermal stability, moisture stability, and photostability. Furthermore, the strategy is extended to synthesize CsPbX3 (X = Cl, Br, I) QDs@PXMs with tunable emission across the visible spectral range from 417.6 to 674.2 nm. A white light-emitting diode fabricated using CsPbBr3 QDs@PXMs and commercial K2SiF6: Mn4+ phosphors achieves a luminous efficiency of 110 lm W–1 and a wide color gamut reaching 133% of the NTSC 1931 standard. These findings demonstrate that CsPbX3 QDs@PXMs constitute robust and high-performance PQD-based composite materials suitable for high-quality lighting and wide-color-gamut display applications.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Hai Chi,Lei Wang,Shuo Wang,Guoqin Liu
A novel quench molecularly imprinted electrochemiluminescence sensor (MIECLS) based on a covalent organic framework composite (COF-300-Au) with enhanced electrochemiluminescence (ECL) signal from CsPbBr 3 quantum dots and cross-linked 3-thiopheneacetic acid functionalized AuNPs (3-TAA@AuNPs) was developed for the detection of the environmental pollutant benzo(a)pyrene (BaP). A composite material constructed of COF-300-Au with a large specific surface area served as the sensor's support substrate, providing more CsPbBr 3 and imprint recognition sites. Electropolymerization was then employed to form an AuNPs three-dimensional imprinting layer with polythiophene cross-linked using BaP as a template and 3-TAA@AuNPs as a functional monomer. A specific cross-linked imprinting recognition effect was recorded on BaP along with the quenching effect of quinones. The density functional theory (DFT) evaluation of the binding mechanism between 3-TAA@AuNPs and BaP revealed powerful MIECLS toward the detection of BaP at concentrations ranging from 10 −14 to 10 −5 M, with a detection limit of as low as 4.1 × 10 −15 M.
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Nanomaterials
·
2023
·Vol. 13
·期 19
·2723
·
IF 5.3
Yanran Wang,Ming-yu Li,Shijie Liu,Yuan Ma,Bo Sun,Liangyu Wang,Haifei Lu,Xiaoyan Wen,Sisi Liu,Xumin Ding
Perovskite quantum dots (QDs), emerging with excellent bright-green photoluminescence (PL) and a large absorption coefficient, are of great potential for the fabrication of light sources in underwater optical wireless communication systems. However, the instability caused by low formation energy and abundant surface traps is still a major concern for perovskite-based light sources in underwater conditions. Herein, we propose ultra-stable zero dimensional–two dimensional (0D–2D) CsPbBr3QD/1,4-bis(4-methylstyryl)benzene (p-MSB) nanoplate (NP) heterostructures synthesized via a facile approach at room temperature in air. CsPbBr3QDs can naturally nucleate on thep-MSB NP toluene solution, and the radiative combination is drastically intensified owing to the electron transfer within the typical type-II heterostructures, leading to a sharply increased PLQY of the heterostructure thin films up to 200% compared with the pristine sample. The passivation of defects within CsPbBr3QDs can be effectively realized with the existence ofp-MSB NPs, and thus the obviously improved PL is steadily witnessed in an ambient atmosphere and thermal environment. Meanwhile, the enhanced humidity stability and a peak EQE of 9.67% suggests a synergetic strategy for concurrently addressing the knotty problems on unsatisfied luminous efficiency and stability of perovskites for high-performance green-emitting optoelectronic devices in underwater applications.Keywords:perovskite quantum dots;p-MSB nanoplate;typical type-II heterostructure;high photoluminescence quantum yield;moisture stability
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Materials Today Communications
·
2023
·
IF 3.8
Yu-Cheng Liu,Rong Zou,Wen-Wu Liu,Chong-Yang Cui,Yi-Xiao Lei,Cai-Xia Li,Sheng-Tao Niu,Zhi-Qiang Xu,Wei-Qian Chen,Wen-Jun Niu,Mao-Cheng Liu,Ming-Jin Liu,Bingni Gu,Fen Ran,Yu-Lun Chueh
Insertion of an inorganic HTM intermediate at the CsPbBr 3 /Carbon interface can significantly improve photo-generated holes extraction efficiency without sacrificing advantages in device stability. Herein, low-cost and eco-friendly Co 3 O 4 nanocrystals were synthesized by precipitation method and utilized as efficient inorganic HTM for CsPbBr 3 PSCs . By regulating the hole quasi-fermi level (E f, HTL ) of the perovskite film with Co 3 O 4 nanocrystals possessing a lower conduction band (CB), the built-in electric field (BEF) inside the CsPbBr 3 can be reinforced, for which the Co 3 O 4 -induced energy level reconstruction facilitates fast charge separation and extraction because of the intensified driving force. In addition, the charge recombination behavior can be effectively inhibited. Finally, all inorganic CsPbBr 3 PSCs with an architecture of FTO/ c -TiO 2 / m -TiO 2 /CsPbBr 3 /Co 3 O 4 /carbon PSC realizes efficiency of 8.92% with an open-circuit voltage ( V oc ) of 1.531 V. Furthermore, the unencapsulated Co 3 O 4 -based PSC exhibits excellent stability in ambient air, keeping 98% of its initial efficiency after 90 days in 80% high humidity condition, and 97% of initial efficiency after 40 days in a high-temperature atmosphere of ∼80 °C.
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CHEMICO-BIOLOGICAL INTERACTIONS
·
2024
·
IF 4.7
Zhiqiang Zhang,Qinglong Wang,Haibo Zhang,Shengchao Wang,Xia Ma,Hui Wang
Mitophagy is a distinct physiological process that can have beneficial or deleterious effects in particular tissues. Prior research suggests that mitophagic activity can be triggered by CaO2-PM-CsPbBr3 QDs, yet the specific role that mitophagy plays in hepatic injury induced by CaO2-PM-CsPbBr3 QDs has yet to be established. Accordingly, in this study a series of mouse model- and cell-based experiments were performed that revealed the ability of CaO2-PM-CsPbBr3 QDs to activate mitophagic activity. Golm1 was upregulated in response to CaO2-PM-CsPbBr3 QDs treatment, and overexpressing Golm1 induced autophagic flux in the murine liver and hepatocytes, whereas knocking down Golm1 had the opposite effect. CaO2-PM-CsPbBr3 QDs were also able to Golm1 expression, in turn promoting the degradation of P53 and decreasing the half-life of this protein. Overexpressing Golm1 was sufficient to suppress the apoptotic death of hepatocytes in vitro and in vivo, whereas the knockdown of Golm1 had the opposite effect. The ability of Golm1 to promote p53-mediated autophagy was found to be associated with the disruption of Beclin-1 binding to Bcl-2, and the Golm1 N-terminal domain was determined to be required for p53 interactions, inducing autophagic activity in a manner independent of helicase activity or RNA binding. Together, these results indicate that inhibiting Golm1 can promote p53-dependent autophagy via disrupting Beclin-1 binding to Bcl-2, highlighting a novel approach to mitigating liver injury induced by CaO2-PM-CsPbBr3 QDs.
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