CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kun He,Dejian Chen,Linfeng Yuan,Jiamin Xu,Kunyuan Xu,Jie Hu,Sisi Liang,Haomiao Zhu
The polymeric composite films incorporating inorganic lead halide perovskite quantum dots (CsPbX 3 QDs, X = Cl, Br or I) are promising color conversion layers for wide gamut display devices such as Mini-LED backlight-based televisions. However, the relatively low emission efficiency and poor stability of these composite films present significant challenges for practical applications. In this study, we present a novel low-temperature in-situ crystallization strategy to prepare CsPbBr 3 /PVDF composite film through a rational designed of precursor, solvent and polymer structure. The strong interaction between PVDF and perovskite QDs via Lewis acid-base interaction allows for precise control over the crystallization and passivation of perovskite QDs. The optimized CsPbBr 3 /PVDF film exhibits bright emission with a photoluminescence quantum yield (PLQY) of up to 70 %, surpassing those of other CsPbBr 3 /polymers counterparts. Furthermore, the films demonstrate remarkable stability, retaining over 90 % of their original PLQY even after 50 days of aging under various environmental conditions such as exposure to air, immersion in water and blue light irradiation. By integrating the green and red emissive CsPbX 3 /PVDF films with blue Mini-LEDs, we successfully fabricate a prototype liquid crystal display (LCD) with an outstanding wide color gamut (128 % of NTSC 1931). These performances outperform that of commercial white-LED-based LCDs, highlighting the immense potential of CsPbX 3 /PVDF for high-definition display applications in the future.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 35
·11865-11875
·
IF 6.4
Xiandi Yu,Yuchi Zhang,Le Han,Yan Xu
All-inorganic CsPbBr3 perovskite quantum dots (PQDs) show superior photophysical properties and great potential in various optoelectronic devices, but their low lattice formation energy and high delocalization of surface ions make them susceptible to ambient conditions. In this work, the hierarchical silicalite-1 zeolite co-templated by carbon nanotubes (CNTs) and tetrapropylammonium hydroxide (TPAOH) was applied to encapsulate CsPbBr3 PQDs. Particularly, distinct nanosized CNTs, mass ratios of zeolite to CsPbBr3, and thermal diffusion temperature were systematically studied to optimize the loading capacity and luminescence efficiency of CsPbBr3 PQDs. Consequently, the micro-/mesoporous silicalite-1 confined CsPbBr3 PQD nanocomposite obtained at 700 °C exhibited the best luminescence performance with a full-width at half-maximum (FWHM) of 25 nm, a high PLQY of ∼61.9% and an ultrahigh stability of >100 days in H2O. The CsPbBr3/silicalite-1 nanocomposite shows dual-mode temperature monitoring performance in terms of fluorescence emission intensity and spectral shift, rendering it a promising candidate for credible optical thermometry. Latent fingerprint identification and selective Fe3+ fluorescence sensing applicability of the CsPbBr3/silicalite-1 nanocomposite were then developed. Also, a reversible off/on switching of the green fingerprint image under UV-light irradiation can be easily modulated by spraying Fe3+ aqueous solution and pure H2O, respectively, achieving an effective anti-counterfeiting application.
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高影响因子
TALANTA
·
2022
·
IF 6.556
Hongbo Wang,Jing Wang,Qian Li,Jianxiu Du
A dual-emission fluorescent nanoprobe was successfully constructed through self-assembling CsPbBr 3 perovskite nanocrystals (CsPbBr 3 PNCs) and tetraphenylporphyrin tetrasulfonic acid (TPPS). Acetylcholinesterase (AChE) is observed to directly quench the green fluorescence of CsPbBr 3 PNCs at 520 nm in the absence of an enzyme substrate, but has no significant influence on the red emission of TPPS at 650 nm. The decreased value of the fluorescence intensities ratio at 520 to 650 nm (ΔF 520 /F 650 ) is proportional to the logarithmic value of AChE activity ranging from 0.05 to 1.0 U/L. The limit of detection is as low as 0.0042 U/L. The relative standard deviation is 3.6% in eleven consecutive measurements of 0.2 U/L AChE. The method exhibits a good anti-interference capacity since it does not respond to most concomitant species. Satisfactory results are acquired for the determination of AChE activity in human serum samples.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Ronghuan Liu,Bihua Hu,Kai Wang,Baomin Xu,Xiao Wei Sun
Compared with polycrystalline thin films, perovskite single crystals without grain boundaries have better photovoltaic performance and stability. However, due to the extremely low solubility of all-inorganic perovskite in organic solvents and the complex phase diagram of CsPbBr3, directly growing large-sized CsPbBr3 perovskite single-crystal wires is challenging. Here, we have developed an airflow-assisted growth method for the rapid synthesis of large quantities of high-quality, dispersed, ultralong CsPbBr3 single-crystal wires under ambient conditions. This method is green (no additives) and low cost (no special treatment). The growth kinetics of single-crystal wires using this method have been elucidated, and their structural and optoelectronic properties were characterized. Some of the CsPbBr3 single-crystal wires synthesized by this method can exceed 1 mm in length with a low trap density of about 9.06 × 1011 cm–3. The constructed photodetector responsivity is up to 0.365 A/W and detectivity is over 3.3 × 1013 Jones, indicating great potential for optoelectronic applications. This low-cost, high-quality all-inorganic CsPbBr3 single-crystal wire growth method is highly scalable and may facilitate the research and application of all-inorganic perovskite single crystals.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xinchu Wang,Jun Wu,Danzhou Huang,Jiaheng Yan,Changwen Li,Zhiqiang Ren,Jinhua Li,Xianbao Wang,Jianying Wang
Conventional perovskite quantum dots (PQDs) suffer long-term stability, further limiting practical application of luminescent solar concentrators (LSCs). In this work, novel dendritic CsPbBr 3 @SiO 2 particles with bright solid-state green light emission and 46 % of photoluminescence quantum yield (PLQY) have first been synthesized via one-step solid-phase calcination method. The dendritic CsPbBr 3 @SiO 2 particles have then been used as fluorescent material for construction of LSCs along with using organosilicon polymers with better compatibility as waveguide materials. Single-layer thin film LSCs and overall curing LSCs are easily prepared by the casting and curing method, exhibiting high external optical efficiency ( η opt ) of 7.88 % and 10.92 %, respectively. The maximum internal quantum efficiency ( η int ) of thin film LSCs and overall curing LSCs reach 45.09 % and 44.07 %, respectively, while their maximum external quantum efficiency ( η ext ) of 29.42 % and 34.07 % are obtained, respectively. Importantly, both types of LSCs show excellent stability, maintaining above 92 % of the initial η opt under high-relative-humidity (RH = 90 %), high-temperature (60 °C) and sunlight exposure conditions for two weeks or room temperature environment for twenty weeks. Moreover, both types of LSCs at optimal conditions have good transparency (>40 % over 515 nm of light wavelength). Otherwise, both types of LSCs have higher η opt than that of the previous related work.
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高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Wenbin Shi,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
Controlled nucleation and slow growth endow blue emitting CsPbX 3 nanocrystals (NCs) with bright photoluminescence (PL), which is crucial needed in luminescent devices. In this paper, a low-temperature injection synthesis method is developed to control nucleation and the growth process by decreasing the reaction rate of ions, thereby controlling the morphologies of CsPbX 3 NCs in clusters, nanorods (NRs), nanoplates (NPLs), and nanocubes by adjusting precursors, ligands, and injection parameters. CsPbX 3 NCs exhibit excellent PL properties such as high quantum confinement effect. The PL peak wavelengths of CsPbBr 3 NPLs and NRs are at 451 and 467 nm, respectively, in which their full width at half maximum (FWHM) of PL spectra is 22 and 12 nm, while their PL efficiencies are 65 and 74%, respectively. The method is further used to create CsPbI 3 and CsPbCl 3 . CsPbI 3 NPLs and NRs reveal PL peaks at 590 and 600 nm and PL efficiencies of 56% and 60%, respectively. These NCs exhibit excellent stability against ultraviolet light irradiation. A color conversion layer for white light-emitting diodes is fabricated using these highly bright NCs. A Commission Internationale d'Eclairage color coordinate of (0.31,0.33) is located at the white light region specified by Rec.2020 standard, and the color temperature reaches 6189 K.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xianwen Li,Wensi Cai,Hongling Guan,Shuangyi Zhao,Siliang Cao,Chen Chen,Min Liu,Zhigang Zang
Owing to their superior optical and electronic properties, all inorganic metal halide CsPbX 3 (X = Cl, Br, and I) perovskite quantum dots (QDs) are regarded as excellent candidates for various optoelectronic applications. However, the instability of such materials greatly hampers their practical applications. In this work, silica-coated didodecyldimethylammonium bromide (DDAB) capped CsPbBr 3 QDs are prepared via a facile method at room temperature. The as-prepared DDAB-CsPbBr 3 /SiO 2 QDs composites demonstrate an effectively improved photoluminescence quantum yield (PLQY) and stability against ethanol and heat. Moreover, the green DDAB-CsPbBr 3 /SiO 2 QDs composites and red InAgZnS QDs are applied as color-converting layers on a blue LED chip for warm white light-emitting diodes (WLEDs). Such WLEDs exhibit an excellent luminescent performance with a color rendering index (CRI) of 88, a color coordinate of (0.41, 0.38), a correlated color temperature (CCT) of 3209 K, and a high power efficiency of 63.4 lm W −1 . Besides, such WLEDs are used for visible light communication (VLC), exhibiting a typical low-pass frequency response, with a corresponding −3 dB bandwidth of about 1.5 MHz. By applying orthogonal frequency division multiplexing (OFDM) with a bit loading, a maximum achievable rate of the VLC system reaches 5.9 Mbps, which is almost four times of their measured −3 dB bandwidth. These results demonstrate the potential of prepared DDAB-CsPbBr 3 /SiO 2 QDs composites not only in high-performance WLEDs, but also as an excitation light source to achieve VLC.
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高影响因子
Crystals
·
2021
·Vol. 11
·期 10
·1165
·
IF 2.589
Tianju Chen,Peng Zhang,Guoliang Chen,Qi Yang,Feiming Li
Perovskite nanocrystals (PNCs) have witnessed unprecedented development in optoelectronic fields over the past few years. However, their intrinsic ionic structural instability still dramatically hinders their practical applications. Reliably improving the stability of PNCs while retaining their colloidal dispersity remains a grand challenge. Herein, we report a new strategy whereby CsPbBr3nanoparticles are grown in situ in an entropy ligand-functionalized SiO2nanoreactor. Consequently, the as-obtained CsPbBr3@SiO2NPs show outstanding stability and colloidal dispersity in various non-polar solvents and have good solution processability, which are unattainable by conventional template-assisted methods.Keywords:perovskites nanocrystals;SiO2nanoreactor;entropy ligands;colloidal dispersity
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高影响因子
Energy & Environmental Materials
·
2021
·Vol. 4
·期 4
·671-680
·
IF 15.122
Ruxin Guo,Yan Zhao,Yongshang Zhang,Quanrong Deng,Yonglong Shen,Wei Zhang,Guosheng Shao
All-inorganic CsPbBr 3 -based perovskite solar cells (PSCs) have attracted great attention because of their high chemical and thermal stabilities in ambient air. However, the short-circuit current density ( J sc ) of CsPbBr 3 -based PSCs is inadequate under solar illumination because of the wide bandgap, inefficient charge extraction and recombination loss, leading to lower power-conversion efficiencies (PCEs). It is envisaged that in addition to narrowing the bandgap by alloying, J sc of the PSCs could be enhanced by effective improvement of electron transportation, suppression of charge recombination at the interface between the perovskite and electron transporting layer (ETL), and tuning of the space charge field in the device. In this work, Nb-doped SnO 2 films as ETLs in the CsPbBr 3 -based PSCs have been deposited at room temperature by high target utilization sputtering (HiTUS). Through optimizing the Nb doping level alone, the J sc was increased by nearly 19%, from 7.51 to 8.92 mA·cm −2 and the PCE was enhanced by 27% from 6.73% to 8.54%. The overall benefit by replacing the spin-coated SnO 2 with sputtered SnO 2 with Nb doping was up to 39% increase in J sc and 62% increase in PCE. Moreover, the PCE of the optimized device showed negligible degradation over exposure to ambient environment (T ˜ 25 °C, RH˜45%), with 95.4% of the original PCE being maintained after storing the device for 1200 h.
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高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Bo Wang,Shan Zhang,Bin Liu,Jinkai Li,Bingqiang Cao,Zongming Liu
CsPbBr3 perovskite quantum dots (QDs) have attracted great attention due to their different photoluminescent and electronic properties. However, the toxicity and low stability hinder their practical application. Here, low-toxicity Sn-substituted cesium lead bromide perovskite QDs were synthesized via the room temperature crystallization method. A phase transition of the perovskite quantum dots with the concentration of Sn increasing was found: the crystal phase of CsPbBr3:Sn perovskite QDs starts to be transformed into Cs4PbBr6:Sn perovskite QDs when the SnBr2 precursor exceeds 30 at. %. In this process, the controlled-color emission of perovskite QDs from green to blue can be realized. To improve the stability of quantum dots, CsPbBr3:Sn@SiO2 and Cs4PbBr6:Sn@SiO2 were synthesized via a simple one-step synthesis with hydrolysis of tetramethoxysilane in toluene solution containing perovskite QDs. The results show that CsPbBr3:Sn@SiO2 and Cs4PbBr6:Sn@SiO2 exhibited higher water stability and water solubility than pure QDs. In a mixed solution of toluene and water, the PL intensity of the CsPbBr3:Sn@SiO2 retained 46.7% and the Cs4PbBr6:Sn@SiO2 was 59.6% even after 24 h of reaction compared with the initial intensities. These quantum dots with good stability and luminescent property developed in this work are expected to be widely used in light-emitting diodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Aizhao Pan,Lihe Yan,Xiaoqin Ma,Youshen Wu,Yanfeng Zhang,Guijiang Zhou,Ling He
Lead halide perovskite nanocrystals (NCs) have shown exceptional optoelectronic characteristics and photovoltaic performance ; however, their instability has limited their use in optoelectronic applications. Herein, we introduce a facile and effective in-situ synthesis strategy to prepare stable core-shell colloidal perovskite nanocrystal-polymer micelle composites (abbr. ap -POSS-PMMA- b -PDMAEMA@CsPbBr 3 ) by using amphiphilic copolymer (abbr. ap -POSS-PMMA- b -PDMAEMA) self-assembled “reverse micelle” templates. The amphiphilic block copolymer with hydrophobic ( ap- POSS and polymethylmethacrylate, PMMA) and hydrophilic blocks (poly 2-(dimethylamino)ethyl methacrylate, PDMAEMA) can be regulated to self-assemble into “reverse” micelles. The micelle serves as a confined nanoreactor during perovskite crystallization, which passivates the perovskite surface by forming a multidentate capping shell and yields the formation of multi-nanocubes with size between 6 and 8 nm and a photoluminescence quantum yield (PLQY) that surpasses 60%. Benefitting from femtosecond transient absorption (fs TA) and time-resolved photoluminescence (PL) spectroscopy studies, the excited carrier dynamics of the obtained composites substantiate fewer internal band-gap trap states from micelle-induced CsPbBr 3 NCs. The films cast from these composites showed enhanced water-resistant properties as compared to bare NCs and previously reported encapsulated NCs. Therefore, the copolymer “reverse” micelle induced in-situ grown NCs provide a potential approach for further engineering the morphology of NC-based composites and open the door to potential scalable and robust optoelectronic applications.
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高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 24
·2101297
·
IF 9.926
Huihui Li,Heng Yang,Rui Yuan,Zhixiang Sun,Yunling Yang,Jingtai Zhao,Qianli Li,Zhijun Zhang
A scintillation screen with ultrahigh spatial resolution, fast decay time, and high stability is the key to commercial application. Herein, a pixelated-structure scintillation screen of CsPbBr 3 nanocrystal arrays based on anodized aluminum oxide (AAO) is reported, and its scintillation properties for X-ray imaging are explored. It is of note that ultrahigh spatial resolution (2 µm), fast photoluminescence decay time (9 ns), and high stability (>42 d) are successfully achieved by the pixelated CsPbBr 3 -AAO arrays scintillation screen. Considering the decent scintillation properties and high stability, one has reason to assume that the pixelated CsPbBr 3 -AAO arrays scintillation screen may find an application as a new X-ray scintillation screen.
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高影响因子
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