CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zhiwen Yang,Gongli Lin,Jieyu Bai,Lechen Li,Yangbin Zhu,Liangrui He,Zhao Jiang,Weijie Wu,Xujiang Yu,Fushan Li,Wanwan Li
Inkjet-printed quantum dot light-emitting diodes (QLEDs) are considered to be ideal candidates for use in full-color displays. However, preparation of eco-friendly blue InP QLEDs using inkjet printing techniques remains rather challenging due to the inferior optical properties of QDs. Here, we present the first efficient method for generating inkjet-printed QLEDs with high color purity using blue InP/ZnS/ZnS QDs as the emitting layer. A two-step heat-up and thick shell strategy was employed for the preparation of blue InP/ZnS/ZnS QDs with a photoluminescence (PL) peak at 465 nm, full width at half-maximum of 38 nm, and PL quantum yield (QY) of ∼ 96 %, which are the records for blue InP QDs. We found that the use of a zinc iodide precursor and anhydrous oxygen reaction environment is critical to determining InP core size, and the size distribution of InP cores can be improved by separating formation of InP magic size clusters and cores via a heat-up step at low temperature. We used two kind of zinc precursors to facilitate shell growth, and the engineered shell thickness suppresses energy transfer, enabling InP/ZnS/ZnS QDs film with high PLQYs and contributing to efficient inkjet printing of QLEDs. These results can facilitate the development of blue InP QLEDs for large-area electroluminescent full-color displays.
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高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2100243
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IF 1.599
Chunyu Sun,Xinzhan Wang,Pengfei Qiu,Xuejiao Mou,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
Temperature-dependent photoluminescence (PL) properties of high quality cubic phase α-CsPbI 3 nanocrystals are investigated, and thermal transfer from free excitons to trapped excitons is observed. Free exciton recombination is the main origin of the high PL quantum yield (97%) at room temperature. Little change of PL peak energy is observed with decreasing temperature from 280 to 200 K, and it shifts from 1.84 to 1.81 eV in the region of 200 and 80 K. The PL peak intensity decreases with decreasing temperature first and then increases, and the minimum value is observed at 180 K. Two PL bands are obtained by Gaussian fittings in the PL spectra detected at different temperatures, and the high energy band is attributed to the emission of free excitons, while that for the low energy band is related to the transition of trapped excitons. The PL integrated intensity ratio of trapped exciton and free exciton transition increases from 0.18 to 2.10 with decreasing the temperature, which suggests that thermal transfer from free exciton to trapped exciton states leads to the dominant optical emission of trapped exciton recombination in the low temperature region.
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ADVANCED MATERIALS
·
2022
·Vol. 34
·期 37
·2204259
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IF 32.086
Jingxuan Chen,Donglin Jia,Rongshan Zhuang,Yong Hua,Xiaoliang Zhang
Perovskite quantum dots (PQDs) have emerged as competitive optoelectronic materials for photovoltaic applications due to their ideal bandgap energy, high defect tolerance, and solution processability. However, the highly dynamic surface and imperfect cubic structure of PQDs generally result in unfavorable charge-carrier transport within the PQD solids and serious nonradiative recombination. Herein, a highly orientated PQD solid is demonstrated using precursor engineering accompanied by a chemical stripping treatment (CST). A combination of systematic experimental studies and theoretical calculations is conducted to fundamentally understand the resurfacing of PQDs using the CST approach. The results reveal that the highly ordered PQDs can result in a high orientation of PQD solids, significantly promoting charge-carrier transport within the PQD solids. Meanwhile, the ideal cubic-structured PQD with an iodine-rich surface dramatically decreases surface trap states, thereby substantially diminishing trap-assisted nonradiative recombination. Consequently, the inorganic PQD solar cell delivers a power conversion efficiency of up to 16.25%. This work provides a feasible avenue to construct highly orientated PQD solids with improved photophysical properties for high-performance optoelectronic devices.
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高影响因子
ACS Sensors
·
2022
·
IF 9.618
Ning Sui,Xiao Wei,Shuang Cao,Peng Zhang,Tingting Zhou,Tong Zhang
As the most widely used gas sensors, metal oxide semiconductor (MOS)-based chemiresistors have been facing great challenges in achieving ppb-level and selective detection of the target gas. The rational design and employment of bimetallic nanocatalysts (NCs) are expected to address this issue. In this work, the well-shaped and monodispersed AuPt NCs (diameter ≈ 9 nm) were functionalized on one-dimensional (1D) In2O3 nanofibers (NFs) to construct efficient gas sensors. The sensor demonstrated dual-selective and ppb-level detection for ozone (O3) and acetone (C3H6O) at different optimal working temperatures. For the possible application exploitation, a circuit was designed to monitor O3 concentration and provide warnings when the concentration safety limit (50 ppb) was exceeded. Moreover, simulated exhaled breath measurements were also carried out to diagnose diabetes through C3H6O concentration. The selective detection for O3 and C3H6O was further analyzed by principal component analysis (PCA). The drastically enhanced sensing performances were attributed to the synergistic catalytic effect of AuPt NCs. Both the “spillover effect” and the Schottky barrier at the interfaces of AuPt NCs and In2O3 NFs promoted the sensing processes of O3 and C3H6O.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Shuang Yang,Wen-hui Guo,Zhenyu Tang,Zehao Zhang,Haoqing Guo,Yinan Lao,Bo Qu,Lixin Xiao,Jun-jie Shi,Zhijian Chen
A long-persistent luminescence (LPL) material based on lead-free perovskite nanocrystals (Cs3In2Cl9 NCs) was synthesized by hot injection at 175 °C. Based on X-ray diffraction and theoretical calculations, the crystal structure of Cs3In2Cl9 NCs belongs to the trigonal space group R3̅c. The Cs3In2Cl9 NC powder emits white light at a peak wavelength of 430 nm with a full width at half maximum (FWHM) of about 118 nm and a photoluminescence quantum yield (PLQY) of 26.3%. The lifetime of its LPL is ∼1 s at 300 K and ∼10 s at 77 K. To explain the mechanism of LPL in Cs3In2Cl9, double self-defect states (DSDS) were proposed. To the best of our knowledge, this is the first time to obtain LPL in undoped lead-free perovskites. It promotes the application of perovskites and the explanation of the mechanism of LPL.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2022
·Vol. 39
·期 9
·2200073
·
IF 3.467
Hengbin Mao,Lei Wang,Junhui Li,Xin Jiang,Shiwei Xue,Mingliang Li,Jinpeng Zhu,Bingbing Fan,Tingting Xu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
All-inorganic perovskite nanocrystals (NCs) have been widely used in many fields due to their excellent photoelectric properties. However, the instability of their structure and the high lead content need to be solved. Herein, the concept of “High-entropy” is introduced into NCs to prepare High-entropy perovskite Cs(Pb 1/3 Mn 1/3 Ni 1/3 )Br 3 NCs by high-energy ball milling method. The effects of milling time and doping ratio of B-site elements on the structure and performance of perovskite NCs are studied. It is found that Mn 2+ and Ni 2+ successfully enter the lattice of Pb 2+ to form “High-entropy” perovskite NCs. In addition, compared with Cs(Pb 0.72 Mn 0.14 Ni 0.14 )Br 3 NCs, Cs(Pb 1/3 Mn 1/3 Ni 1/3 )Br 3 NCs have greater luminous intensity and stability, which because of the enhancement of band gap and valence bonds. Furthermore, photoluminescence intensity at 515 nm increase obviously when Cs(Pb 1/3 Mn 1/3 Ni 1/3 )Br 3 NCs are heated at 120 °C. This is due to the lattice distortion effect brought about by ion doping. This study is expected to provide an effective way for synthesis and stability of all-inorganic perovskite NCs doped with more kinds of different ions. Moreover, it also lays the foundation for the introduction of “High-entropy” into perovskite functional ceramics.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hongjing Wang,Wenxin Wang,Qiqi Mao,Hongjie Yu,Kai Deng,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Strain engineering is a prospective approach to enhance catalytic performance of electrocatalysts. Herein, we report a CO-confined growth method for the synthesis of tensile-strained PdNi bimetallene as bifunctional catalyst for hydrogen evolution reaction (HER) and formate oxidation reaction (FOR). Ascribed to electronic effect and strain effect derived from the introduction of Ni and ultrathin curved geometry, PdNi bimetallene possesses sufficient active sites and modulates the adsorption/dissociation of electrocatalytic intermediates, resulting in outstanding activity and stability for HER and FOR. In HER-FOR system, a low cell voltage of 0.51 V is achieved at 20 mA cm −2 by PdNi bimetallene, which is 1.21 V lower than that for the conventional water electrolysis. This work offers a versatile route for the synthesis of crimped bimetallene materials for advanced energy-efficient hydrogen production and beyond.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tong Wei,Kai Lian,Jiaqi Tao,Hu Zhang,Da Xu,Jiachen Han,Chao Fan,Zihui Zhang,Wengang Bi,Chun Sun
Luminescent solar concentrators (LSCs) can be used as large-area sunlight collectors, which show great potential in the application of building-integrated photovoltaic areas. Achieving highly efficient LSCs requires the suppression of reabsorption losses while maintaining a high photoluminescence quantum yield (PLQY) and broad absorption. Perovskites as the superstar fluorophores have recently emerged as candidates for large-area LSCs. However, highly emissive perovskites with a large Stokes shift and broad absorption have not been obtained up to now. Here, we devised a facile synthetic route to obtain Mn-doped multiple quantum well (MQW) Br-based perovskites. The Br-based perovskite host ensures broad absorption. Efficient energy transfer from the exciton to the Mn dopant produces a large Stokes shift and high PLQY simultaneously. By further coating the perovskites with Al2O3, the stability and PLQY are greatly elevated. A large area of liquid LSC (40 cm × 40 cm × 0.5 cm) is fabricated, which possesses an internal quantum efficiency (ηint) of 47% and an optical conversion efficiency (ηopt) reaching 11 ± 1%, which shows the highest value for large-area LSCs.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xinhong Zhao,Yu Tao,Jixiang Dong,Yongchu Fang,Xiaoxian Song,Zaoxue Yan
Wearable, portable, and biocompatible optoelectronic devices made of all-green and abundant materials and fabricated by low-temperature solution method are the key point in the development of next generation of intelligent optoelectronics. However, this is usually limited by the weaknesses of mono-component materials, such as non-adjustable photoresponse region, high carrier recombination rate, high signal-to-noise ratio, as well as the weak mechanical flexibility of bulk films. In this work, the Cs3Cu2I5/ZnO heterostructure flexible photodetectors were constructed by a low-temperature solution method combined with spin-coating technique. The heterostructure combines the low dark current and strong deep ultraviolet absorption of Cs3Cu2I5 quantum dots with the high carrier mobility of ZnO quantum dots as well as the efficient charge separation of the vertical p–n junction, to improve the photodetection performance. The heterostructure shows enhanced light/dark current ratio and ultraviolet-to-visible rejection ratios. Under an illumination of 280 nm light, an optical detectivity as high as 1.26 × 1011 Jones was obtained; the optical responsivity and response time are much better than those of control devices. After 300 times of 180° bending cycles, the photocurrent had no obvious change. The results demonstrate that the Cs3Cu2I5/ZnO heterostructure has great potential in wearable and portable visible-blind ultraviolet optoelectronic devices.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hong Zhu,Chengdong Peng,Jiayi Li,Xuanyu Cao,Yuexiao Pan
The anion-exchange among halogen ions is an effective technique for tuning the chemical composition and emission color of all-inorganic halide perovskite CsPbX 3 (X = Cl, Br, and I) nanocrystals by tailoring their bandgaps. This work is focused on the rate of the reversible anion-exchange through finely tuning the luminescence color of perovskite nanocrystals (NCs) in any region between red and green. The luminescence color of the perovskite CsPb(I 1-x Br x ) 3 (0 ≤ x ≤ 1) has been finely tuned through tailoring its bandgap with the anion-exchange between CsPbI 3 and 4-bromo-butyric acid (BBA) instead of introducing of bromide salts as starting materials. The BBA could serve as triple functions to afford Br − ions source, short chain ligand with carboxyl group for surface passivation , and weak acid. A systematic study has been carried out to elucidate the effect of experimental parameters, on the color rangeability of the NCs and the anion-exchange rate between CsPbI 3 and BBAThe trace of water added into the system can hinder the spontaneous transformation from red CsPbI 3 to CsPbBr 3 with aging time. It is particularly valuable to realize the reversible processes from green to yellow and finally to red successively by increasing the concentration of the isolated I − ions from various inorganic iodides.
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高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Cong Zhou,Fanfan Xu,Wei Wang,Wendong Nie,Weixiong You,Xinyu Ye
As an emerging optical material, all-inorganic perovskite quantum dots (QDs) have been successfully applied in some fields. However, inherent ionic properties of perovskite QDs lead to poor stability of water and heat which severely hinders the further industrial applications. Therefore, the incorporation of Metal-Organic Framework (MOF) into QDs to obtain CsPbX 3 @MOF composite is developing to improve the stability of all-inorganic perovskite QDs. In this work, a simple and fast method was developed to synthesize a CsPbBr 3 @EuBTC composite. The water stability and thermal stability of the CsPbBr 3 @EuBTC composite have been improved compared to pure CsPbBr 3 QDs. Simultaneously, luminescent properties and promising latent fingerprints and optical anti-counterfeiting applications of the CsPbBr 3 @EuBTC composite are further explored. Under fluorescent interference, it still shows excellent luminescence sensitivity and anti-interference ability. The CsPbBr 3 @EuBTC composite displays dual-mode luminescence as excited under the 365 nm or 254 nm ultraviolet (UV) excitation wavelength. Adjusting the ratio of CsPbBr 3 QDs to EuBTC in the CsPbBr 3 @EuBTC composite can also achieve multi-color luminescence. Therefore, it is expected that CsPbBr 3 @EuBTC can be applied to latent fingerprints and multi-mode optical anti-counterfeiting materials.
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Chemosensors
·
2022
·Vol. 10
·期 9
·373
·
IF 4.229
Junfang Hao,Min He,Bin Liu,Jianhui Yang
The preparation and self-assembling of monodisperse gold nanoparticles (Au NPs) is of great significance for its SERS application. According to the oleylamine-reduced method, oleylamine (OAm) serves as the reducing agent and stabilizing agent, and the effects of different reaction parameters such as solvent and temperature on the size and dispersity of Au NPs have been evaluated. The Au NPs synthesized with toluene as the solvent have the best dispersity and narrowest particle size distribution with adjustable sizes. The particle size gradually increases with the increase in reaction temperature. The highly ordered self-assembly film of Au NPs was employed as surface-enhanced Raman scattering (SERS) substrate for the probing molecule of rhodamine 6G. The Au substrate exhibits excellent spatial uniformity and SERS reproducibility, which indicates its practicability as a substrate. This study provides a simple synthesis strategy of highly ordered monodispersed Au NPs, which can serve as a SERS substrate with excellent spatial uniformity and SERS re-producibility.Keywords:gold nanoparticles;solvent effect;monodispersity;surface-enhanced Raman scattering (SERS)
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