CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Pengfei Ma,Yixin Hou,Ziyu Chen,Jun Su,Luying Li,Nishuang Liu,Zhi Zhang,Xueliang Jiang,Fei Long,Yanan Ma,Yihua Gao
The poor stability of all-inorganic perovskite quantum dots (QDs) limits its application in the field of optoelectronics although it possesses prominent luminescent properties. Herein, we proposed a selective nucleation-growth strategy through anchoring the CsPbBr 3 QDs on the aminated hierarchical three-dimensional layered double hydroxide (A3D-LDH). The strong interaction between the amino group and Pb 2+ endows the anchoring effect of A3D-LDH. Coordinated with the isolation effect of flower-like structure, the A3D-LDH/CsPbBr 3 composites exhibited high solid photo-luminescence quantum yield (82.35%) and enhanced stability against the adverse environment (humidity air, irradiation, and heat), which is attributed to restricted aggregation and surface passivation of CsPbBr 3 QDs. Benefiting from the advantageous properties, an efficient white light-emitting diode (LED) is fabricated by introducing A3D-LDH/CsPbBr 3 composites as green phosphors with color coordinates (0.349, 0.349) at a correlated color temperature of 4841 K. We believe that our method offered a promising candidate for solid-state lighting and display.
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高影响因子
CARBON
·
2021
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IF 9.594
Jie Guan,Minxia Song,Lu Chen,Yun Shu,Dangqin Jin,Gaochao Fan,Qin Xu,Xiao-Ya Hu
All-inorganic cesium lead perovskite quantum dots (PQDs) with excellent optical properties have obtained extensive study in the field of optoelectronics . However, the poor stability of CsPbBr 3 in the atmosphere and water severely limits their practical application. In this work, carbon quantum dots (CQDs) were exploited as dopants to improve the aqueous stability and photo-induced charge transfer properties of CsPbBr 3 . A highly fluorescent and aqueous stable film, consisting of CQDs-CsPbBr 3 embedded in polyvinylidene fluoride (PVDF) polymer, was obtained by a simple spin coating method. Experiment results showed that the fluorescence (FL) intensity of CQDs-CsPbBr 3 @PVDF film retained about 85% of its initial value after being soaked in water for 50 days, indicating the good water stability of CQDs doped CsPbBr 3 . Besides, the photocurrent of CsPbBr 3 film increased from 0.1 μA to 0.9 μA after doping CQDs under light irradiation, which proved that the improved charge transfer of CsPbBr 3 was beneficial from CQDs. The application of CQDs-CsPbBr 3 @PVDF film in down-converted light emitting diodes has also been checked. This work highlighted one application of CQDs for improving the performances of PQDs in the field of optoelectronics.
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JOURNAL OF CRYSTAL GROWTH
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2021
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IF 1.797
Decao Ma,Lei Wang,Peiran Tong,Yanyan Zhang,Xin Jiang,Hengbin Mao,Tingting Xu,Bingbing Fan,Gang Shao,Wen Liu,Mingliang Li,Jinpeng Zhu,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
CsPbX 3 (X = Cl, Br, I) all-inorganic perovskite quantum dots have attracted extensive attention from researchers recently. However, the further development is confined by serious stability problems. In this work, the CsPbBr 3 QDs@SiO 2 /EVA films were prepared by supersaturated recrystallization, and SEM, EDS, XRD, FT-IR and PL were used to study microstructure, phase composition, and optical properties. Results show that during the preparation process, the amounts of precursor added would affect the fluorescence emission intensity of materials. The preparation method of films is simple, easy to operate, low cost, and beneficial to commercial large-scale production. In a typical synthesis, PbBr 2 and CsBr are dissolved in DMF, and then oleic acid (OA) and oleylamine (OAm) as ligands are added to stabilize the DMF−PbBr 2 −CsBr precursor solution. When the addition of TEOS is 0.06 mL, the PL peak strength of prepared films is higher and the thickness of CsPbBr 3 QDs@SiO 2 /EVA films is about 100 μm and flexible enough to be bent. At room temperature, the retention of fluorescence intensity of films is 67.4% after 30 d in the air, the retention is 63.6% after 40 h in the water, and the retention is 72.1% after 40 h under the UV light. EVA resins and SiO 2 coating can effectively isolate the contact between quantum dots and moisture and delay the intrusion of oxygen, which significantly improves the stability of pure quantum dots.
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高影响因子
Journal of Physical Chemistry C
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2020
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IF 4.189
Yanmin Kuang,Chaofeng Zhu,Wenli He,Xiaojuan Wang,Yulu He,Xia Ran,Lijun Guo
The surface state of all-inorganic cesium lead halide (CsPbX3) perovskite quantum dots (QDs) is a crucial factor for the performance of CsPbX3 QD-based optoelectronic devices. In this research, we demonstrate a rational and efficient approach for regulating the surface state of CsPbBr3 QDs by diluting surface ligands. With a systematic investigation of the optical properties of CsPbBr3 QDs from ensemble to a single particle by decreasing the surface ligands, we proposed that two competitive exciton decay pathways of single exciton deactivation, short-lived band-edge emission (∼3 ns) and long-lived surface trap-state emission (∼6–12 ns), are closely related to the emission behavior and optical properties of CsPbBr3 QDs. These findings are of significance in understanding the nature of surface ligand density, trap states, and their roles in the photoluminescence quantum yield and in improving the optical property, efficiency, and stability of CsPbX3 QD-based devices.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yuxin Zong,Taiqun Yang,Pan Hao,Bingqian Shan,Bo Peng,Xiaodan Hu,Ran Tao,Xinqing Chen,Peng Wu,Kun Zhang
Cesium lead halide-based perovskite (CsPbX 3 , X = Cl, Br, I) nanoparticles (NPs) have received considerable attention for their outstanding photophysical properties and promising applications in optoelectronic devices. However, the optoelectronic performance of CsPbX 3 NPs synthesized by most of present strategies are susceptible to external factors when exposed in atmosphere. Herein, benefiting from the unique open 3D porous architecture of dendritic mesoporous silica nanospheres (DMSNs) with cage-like spherical nanopores , highly dispersed and pure cubic CsPbX 3 NPs were successfully immobilized onto the mesoporous networks. A strategy of combining chemical anchoring and spatial isolation is designed for the one-pot synthesis of CsPbX 3 NPs. These as-fabricated CsPbX 3 @HA-DMSNs exhibit excellent luminescence property (tunable emission color and high quantum yield (QY reached a maximum of 55%)) and enhanced stability (especially for the water resistance capacity). The photoluminescence (PL) was sustained without any distinct change after 100 d storage under ambient conditions, even 90% PL intensity was maintained after continuous UV irradiation for 45 h and no obvious PL reduction was observed when soaked in water for 7 h. Most importantly, the resulting CsPbX 3 @HA-DMSNs could be easily purified by filtration without aggregation and easy to scale up production compared with the conventional solution-phase mediated synthesis, which provides an alternative for the effective fabrication of perovskite-based devices, for example, here, the white light emitting devices (LEDs).
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ACS Applied Nano Materials
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2019
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IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Xin Liu,Xiaosong Zhang,Lan Li,Jianping Xu,Shuili Yu,Xiaokai Gong,Jiajia Zhang,Hao Yin
Perovskite quantum dots (PQDs) are among the most important luminescent semiconducting materials; however, they are unstable. Exposure to light, heat, and air can lead to irreversible degradation, which results in fluorescence quenching. Therefore, defects in PQDs significantly limit their practical application. Herein, we describe a simple method to enhance the photostability of CsPbBr3/nCdS QDs, which involves doping their shells with aluminum. The temperature-dependent photoluminescence (PL) of colloidal CsPbBr3/nCdS/Al2O3 QDs is investigated, and the thermal quenching of PL, blue shift of the optical band gap, and PL line width broadening are observed in each QD sample. Al2O3 layers on the CsPbBr3/nCdS QDs can effectively prevent photodegradation. Nonlinear, temperature-dependent exciton–phonon coupling and lattice dilation leads to radiative and nonradiative relaxation processes at temperatures ranging from 10 to 300 K; moreover, changes in the band gap and PL spectral line broadening are observed.
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PubMed
高影响因子
Advanced Optical Materials
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2023
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IF 9
Bing Tang,Shixun Wang,Haochen Liu,Nanli Mou,Arsenii S. Portniagin,Peigang Chen,Ye Wu,Xiaoqing Gao,Dangyuan Lei,Andrey L. Rogach
Owing to their attractive optical and chiroptical properties, chiral metal halide perovskites have received increasing attention, with potential applications ranging from photonics and optoelectronics to spintronics. Metal halide perovskite nanocrystals with either intrinsic or extrinsic (e.g., chiral ligand-induced) chirality have been reported recently, and the interplay between these two types of chirality has yet to be addressed. Herein, the inversion and tuning of excitonic optical activity is reported in intrinsically chiral perovskite nanoplatelets, originating from interactions between their structural chirality (due to the spontaneously formed screw dislocations in the crystalline lattice) and the surface enantiomeric (R/S) chiral ligands R/S-phenylethylammonium bromide. Through post-preparative exposure of the perovskite nanoplatelets to these R/S ligands of varied contents, either chiral ligand-induced intrinsic chirality inversion or negative and positive Cotton effects induced by the ligands via electronic coupling between the ligand and the nanoplatelets are identified. These findings deepen understanding of the modulation of excitonic optical activity in chiral perovskites and can guide the rational design and synthesis of novel chiral materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yue Zhao,Shujie Jiao,Shuo Liu,Yimin Jin,Song Yang,Xianghu Wang,Tong Liu,Hongyan Jin,Dongbo Wang,Shiyong Gao,Jinzhong Wang
All-inorganic metal halide perovskite is considered as one of the most promising perovskite materials for photodetectors , because of its remarkable optoelectronic characteristics and stability. Whereas, it remains challenge to achieve both excellent photodetection performance and stability due to the multitudes of defects in perovskite films. Herein, an interface engineering based on surface passivation strategy to achieve high-quality CsPbBr 3 perovskite films by introducing thioacetamide (C 2 H 5 NS, abbreviated as TAA) as interface materials is reported. The interaction between TAA and perovskite passivates the uncoordinated Pb 2+ on the surface of CsPbBr 3 film, suppress carrier non-recombination and accelerates carriers transfer. The self-powered photodetector based on the passivated CsPbBr 3 film prefers the maximum responsivity of 0.26 A W −1 and detectivity of 8.39 × 10 12 Jones under 520 nm irradiation. In addition, the optimized photodetector exhibits excellent stability and maintains more than 98% of its initial photocurrent when operating over 8 h. This work demonstrates an alternative approach for the preparation of improved performance in CsPbBr 3 perovskite photodetectors and associated photoelectric devices.
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Flexible and Printed Electronics
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2023
·Vol. 8
·期 3
·035008
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IF 3.1
Xianyao Wu,Kai Yin,Mu Yang,Yufeng Hu,Hongshang Peng
All-inorganic perovskite quantum dots (PQDs) have received considerable attentions due to their fascinating optical properties. However, the mainstream preparation methods rely on toxic solvents, raising significant environmental and safety concerns. In this work, ethyl acetate was chosen as the environmentally friendly anti-solvent to prepare silica-coated CsPbBr3 PQDs using a aminoalkoxysilane-assisted reprecipitation–encapsulation method. The as-prepared PQDs exhibited tunable emission wavelength and a medium photoluminescence quantum yield (PLQY) of 60%. Furthermore, CsPbBr3 PQDs were post-treated by different ligands with the aim of passivating surface defects. This strategy successfully mitigated the presence of surface defects and minimized non-radiative recombination losses in PQDs. As a result, the PLQY (achieving up to 73%) and stability of PQDs were substantially enhanced (luminescence stability improved by about 40% under the same test conditions). Our studies offer a novel approach for the environmentally friendly large-scale production of PQDs, opening up new possibilities for their practical applications.
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高影响因子
OPTICAL MATERIALS
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2023
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IF 3.9
Lifang Wu,Jun Wang,Wenzhi Wu
In this work, photoluminescence (PL) intensity and stability of CsPbBr 3 /PbBrOH powders synthesized by one-pot method are enhanced through the encapsulation of poly (vinyl acetate) (PVA) in water. Understanding the function of PbBrOH and PVA matrix for photogenerated transition can be achieved through temperature-dependent steady-state and time-resolved PL. The enhanced PL quantum yield (65.9%) and longer lifetime indicate the strengthened structural stability and a significant reduction in nonradiative recombination of CsPbBr 3 . Negative thermal quenching can be observed and interpreted using a multilevel PL transition model. Through nanosecond time-resolved PL spectra under femtosecond laser excitation, it is revealed that the PL position shows a redshift (∼8 nm) with time delay due to the reduction of band-filling effect during the recombination of photoexcited carriers. PVA further encapsulates CsPbBr 3 /PbBrOH powders to form a flexible film, which exhibits excellent thermal and water stability due to the dual protective effects of PVA and PbBrOH. The experimental investigation demonstrates that CsPbBr 3 encapsulated by PbBrOH and PVA possesses excellent luminescent and water-resistant characteristics, making it a new choice for practical applications in LEDs and screen printing.
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ACS Applied Nano Materials
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2023
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IF 5.9
Min Wang,Zhiyong Lei,Chun Du,Yanwei Wen,Bin Shan,Kun Cao,Rong Chen
The instability of inorganic cesium lead halide perovskite quantum dots (QDs) limits their commercial applications. Here, a streamline surface nanotailoring strategy combining defect passivation and alumina infiltration and encapsulation via atomic layer deposition was employed to improve the luminescence properties and stability of QD films. Didodecyl dimethyl ammonium bromide with oleic acid pretreatment was used to reduce nonradiative recombination and photoluminescence quenching through strong bonding. Al2O3 infiltrated through the gaps between the QDs with ng precision control and formed a dense encapsulation barrier, which separated QDs from the influence of the external environment. The fluorescence lifetime and the overall stability of the obtained QD films were greatly improved, which have application prospects in high-power white light-emitting diodes.
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