Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 15
·5849-5855
·
IF 8.067
Qiang Zhang,Minghui Jiang,Guijun Yan,Yaqing Feng,Bao Zhang
All-inorganic CsPbBr3 perovskite quantum dots (CsPbBr3 QDs) have become one of the most promising materials in the field of optoelectronics. However, the poor stability and low photoluminescence quantum yield (PLQY) of CsPbBr3 QDs hinder their further applications. Herein, fluorinated aromatic ammonium bromide (fluorophenethyl ammonium bromide, FPEABr) is introduced in the synthesis of CsPbBr3 QDs. The influence of the fluorination position (ortho, meta, and para) at the benzene ring on the optical properties and stability of CsPbBr3 is systematically evaluated. The results indicate that the short fluorinated aromatic alkyl ammonium chain has been successfully adsorbed onto the surface of CsPbBr3 QDs, and the bromine vacancy defects have been significantly reduced. Eventually, stable CsPbBr3 QDs with a high PLQY (>90%) are achieved with the use of pFPEABr. Furthermore, the short chains of the ligand improved the carrier transport in the CsPbBr3 QD film, and thus the surface treatment increases the maximum luminance of the corresponding perovskite quantum dot light-emitting diodes (QLEDs) from 531 to 1278 cd m−2. The surface ligand engineering strategy involving the FPEABr ligand, in particular pFPEABr, actually provides a new direction for the future development of high-performance QLEDs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jinlong Wang,Zihan Zhao,Yiping Wu,Chunwen Ye,Yanjie Zhang
Advanced fluorescent anticounterfeiting technology has received widespread attention due to the lack of sufficient security of traditional anti-counterfeiting. Hence, there is a great challenge to continuously develop multi-level anti-counterfeiting technology with higher security. Here, we develop a desired fluorescent anticounterfeiting technology based on CsPbBr3 perovskite quantum dots (PQDs) and CaAl2O4:Eu2+, Nd3+ composites with persistent luminescence properties. CsPbBr3 PQDs can be formed on the surface of the CaAl2O4 host and exhibit an average diameter of around 3.5 nm. The photoluminescence (PL) intensity of CsPbBr3 PQDs/CaAl2O4 composites is greatly enhanced to 125 times compared to that of pure CsPbBr3 PQDs, and the desired narrow FWHM of 19 nm is achieved under near-ultraviolet irradiation. Furthermore, highly stable CsPbBr3 PQDs/CaAl2O4:Eu2+, Nd3+ composites with triple-modal (UV, IR, and thermal) fluorescent anti-counterfeiting characteristics were developed and used in fabricating anti-counterfeiting labels through screen-printing technology. The results open up a pathway to enhance the photoluminescence properties and stability of perovskite quantum dots for the advanced fluorescent anticounterfeiting application.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zijun Yan,Fangshun Ye,Liyue Xu,Xiao Yang,Shouqiang Lai,Shuli Wang,Yue Lin,Guolong Chen,Yijun Lu,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu
Atomic layer deposition (ALD) plays a pivotal role in raising the long-term stability of perovskite quantum dot (PQD). The deposition temperature of excellent alumina film prepared by ALD is generally higher than 200 °C. In such a temperature environment, the lattice morphology of PQD is seriously damaged. In this work, to effectively protect PQD, the optimum temperature for depositing alumina on the surface of CsPbBr 3 PQD is investigated. The CsPbBr 3 PQD is deposited on a transparent glass substrate . Subsequently, an alumina layer is deposited on the surface of PQD via ALD at a deposition temperature of 40–120 °C. In our experiment, the significant degradation of PQD is observed when the deposition temperature of ALD is set to 80 °C and above. Lowering the deposition temperature can effectively improve the optical performance of PQD. The samples with alumina deposited at 75 °C show excellent stability after undergoing aging tests, and therefore 75 °C is considered the best ALD temperature. Besides, white light-emitting diode (W-LED) is produced by a method that a stack structure consisting of CsPbBr 3 coated via ALD at 75 °C and CdSe QD is excited using blue Micro-LED, and the color gamut of W-LED accounts for the wide area of 94.00% NTSC (1953) and 86.20% Rec.2020 displayed wide color gamut features. The experiment provides practical guidance for selecting the optimal deposition temperature for ALD-packaged PQD-based devices.
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LANGMUIR
·
2023
·
IF 3.9
Yu Zhang,Guangning Hou,Yong Wu,Maosheng Chen,Yannan Dai,Shaohua Liu,Qingbiao Zhao,Hechun Lin,Junfeng Fang,Chengbin Jing,Junhao Chu
Oleylamine/oleic acid (OAm/OA) as the commonly used ligand is indispensable in the synthesis of perovskite nanocrystals (PNCs). Unfortunately, poor colloidal stability and unsatisfactory photoluminescence quantum yield (PLQY) are observed, resulting from a highly dynamic binding nature between ligands. Herein, we adopt a facile hybrid ligand (DDAB/ZnBr2) passivation strategy to reconstruct the surface chemistry of CsPbBr3 NCs. The hybrid ligand can detach the native surface ligand, in which the acid–base reactions between ligands are suppressed effectively. Also, they can substitute the loose capping ligand, anchor to the surface firmly, and supply sufficient halogens to passivate the surface trap, realizing an exceptional PLQY of 95% and an enhanced tolerance toward ambient storage, UV irradiation, anti-solvents, and thermal treatment. Besides, the as-fabricated white light-emitting diode (WLED) utilizing the PNCs as the green-emitting phosphor has a luminous efficiency around 73 lm/W; the color gamut covers 125% of the NTSC standard.
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PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 1
·373-380
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IF 3.3
Wenfang Peng,Rongrong Hu,Bobo Yang,Qiaoyun Wu,Pan Liang,Lin Cheng,Xixi Cheng,Yuefeng Li,Jun Zou
Metal halide perovskites are particularly emerging for optoelectronic applications in light-emitting diodes, photodetectors, and solar cells due to their flourishing photophysical properties. However, the poor stability of three-dimensional (3D) lead halide perovskite nanocrystals (NCs) significantly hampers their optoelectronics and photovoltaics applications. Embedding 3D perovskites into zero-dimensional (0D) perovskite crystals and doping ions of appropriate elements into host lattices provide effective approaches to improve the stability and optical-electronic performance. In this study, millimeter-scale Mn-doped and undoped CsPbBr3/Cs4PbBr6 perovskite crystals were successfully fabricated by a one-step slow cooling method. We systematically investigated the effects of Mn2+ ion doping on the PL performance and stability of CsPbBr3/Cs4PbBr6 crystals. Compared with undoped crystals, the existence of Mn2+ ions not only blue-shifted the PL peak but also improved the luminescence performance and stability of the prepared millimeter-sized crystals. Moreover, doping Mn2+ ions can increase the proportion of radiative recombination at low temperature, which may be because Mn2+ ions can effectively accelerate the decay of a dark exciton by the magnetic mixing of bright and dark excitons. In addition, green LED devices with high efficiency packaged as-grown crystals are explored, which promises further application in display backlights.
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高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yizhu Wang,Jiaqi Shi,Ruiqi Xiao,Cong Xiao,Huiqin Yao,Lingchen Meng,Hongyun Liu
In this study, metal halide perovskites, which are excellent materials for optoelectronic devices, were examined to construct molecular logic gates. The photoluminescence (PL) and electrochemiluminescence (ECL) properties of the CsPbBr3 nanocrystals (NCs) were effectively maintained in the CsPbBr3@SiO2 NC films; these films were simply prepared by depositing nanocrystals on the electrode surface through the viscosity of SiO2 in the coating. The dual-optical signals of the films were found to have different responses to the external stimuli of Fe(III) and dopamine (DA). The PL signal of the films was quenched by Fe(III), and this effect was exacerbated at a high concentration of DA due to the formation of oxidation products. However, the addition of ascorbic acid (AA) could restore the PL signal. While the ECL signal of the films did not show evident changes with the concentration of Fe(III), the ECL signals quenched by a low concentration of DA could be reverted by Fe(III). Thus, a multiple input–output molecular logic circuit based on the CsPbBr3@SiO2 film electrode system was constructed by using Fe(III), DA, and AA as 3 inputs and the PL and ECL at different states as 6 outputs. A series of logic circuits, including an encoder/decoder, a dual transfer gate, a parity checker, a demultiplexer, and a resettable keypad lock, were successfully simulated. Specifically, a ternary CONSENSUS logic gate with a dual-optical signal output was initially mimicked based on this film electrode. This work could provide a simple approach to design a molecular information system based on the modulated multioptical signals of perovskites and could further expand the potential applications of perovskites in multiple-molecule recognition, chemical information storage, and optoelectronic devices.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Weilin Zheng,Qun Wan,Mingming Liu,Qinggang Zhang,Congyang Zhang,Ruixin Yan,Xiuping Feng,Long Kong,Liang Li
Perovskite nanocrystals (NCs) have gained great interest for next-generation light-emitting diodes (LEDs) prized for their spectrally tunable, narrow luminescence and their defect-tolerant electronic structure. Here, we provide a careful surface engineering to balance the passivation and charge injection by controlling the ligand density of didodecyl dimethyl ammonium bromide on NCs, which not only offers an improved photoluminescence quantum yield of >70% for NCs but also guarantees the effective charge injection and transportation of CsPbBr3 NC films for fabricating LEDs. Additionally, the optimization of the hole transport layer was implemented to offer more balanced charge transportation, which further improved the performance of CsPbBr3 NC-based LEDs with a peak external quantum efficiency of 13.4%.
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Nanoscale
·
2021
·Vol. 13
·期 21
·9740-9746
·
IF 7.79
Dongdong Yan,Qionghua Mo,Shuangyi Zhao,Wensi Cai,Zhigang Zang
With a high photoluminescence quantum yield (PLQY) being able to exceed 90% for those prepared by the hot injection method, CsPbBr3 quantum dots (QDs) have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole process is carried out in a 3-neck flask via air isolation and at a relatively high temperature. In addition, CsPbBr3 QDs suffer from poor stability under ambient atmosphere. In this work, an effective strategy through doping of Sn2+ ions at room-temperature is proposed to improve the emission efficiency and stability of CsPbBr3 QDs. Compared with pure CsPbBr3 QDs, a higher PLQY and a better stability are obtained. The detailed physical mechanism for this performance enhancement is discussed and described. An optimum result is found at an Sn2+ doping amount of 20%, which shows a high PLQY of 82.77%. WLEDs based on these 20% Sn2+ doped CsPbBr3 QDs are also studied, exhibiting a high color rendering index of 89 and a correlated color temperature (CCT) of 3954. The method proposed here provides an effective strategy to enhance the fluorescence and stability of CsPbBr3 QDs, which might have promising potential in the lighting fields.
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Solar RRL
·
2020
·Vol. 4
·期 10
·2000362
·
IF 7.527
Xueke Li,Benlin He,Zekun Gong,Jingwei Zhu,Wenyu Zhang,Haiyan Chen,Yanyan Duan,Qunwei Tang
Carbon-based CsPbBr 3 perovskite solar cells (PSCs) without hole-transporting layers (HTLs) have aroused extensive attention due to their low manufacturing cost and prominent ambient stability. However, the defects of perovskite film and the poor charge extraction within PSCs result in severe charge recombination, which restricts the further enhancement of device efficiency. In view of this critical point, a compositional engineering of CsPbBr 3 perovskite via doping with Cl − ions is presented herein to decrease the trap states and enhance the charge extraction. It is revealed that the doping of Cl − ions not only enlarges the grain size and thereby reduces the trap-state density, but also optimizes the energy-level alignment and improves the hole mobility of the perovskite film, leading to an evidently suppressed charge recombination and improved charge extraction and transportation. As a result, a champion power conversion efficiency (PCE) of 9.73% is achieved for carbon-based HTL-free CsPbBr 2.98 Cl 0.02 PSC, yielding a marked enhancement in comparison with 6.69% efficiency for the control. Meanwhile, the thermal and moisture stabilities of unencapsulated CsPbBr 2.98 Cl 0.02 PSC are improved, maintaining 93% and 95% of the initial PCE after expose to air atmosphere with 80% relative humidity (RH) and at 80 °C over 60 days, respectively.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17374-17382
·
IF 7.059
Xiaoliang Pang,Shuaichen Si,Liqing Xie,Xuejie Zhang,Haozhang Huang,Shuting Liu,Wenxin Xiao,Surui Wang,Tongtong Xuan,Jianle Zhuang,Chaofan Hu,Yingliang Liu,Bingfu Lei,Haoran Zhang
Embedding CsPbBr3 quantum dots (QDs) in inorganic glasses via in situ crystallization has been regarded as a feasible strategy to improve their stability due to the protecting role of the robust glass matrix. However, the influence of the rigidity of the glass network structure on CsPbBr3 crystallization is rarely reported. Herein, we report an approach to control the rigidity of the glass network structure through substituting the [GeO4] tetrahedron with the [SiO4] tetrahedron in mother glass, which allows fine-tuning of the morphology and luminescence properties of CsPbBr3 QDs. The water-resistance of CsPbBr3 QD glass (CsPbBr3 QD@glass) is clearly enhanced by increasing the content of the [SiO4] tetrahedron, while the size of CsPbBr3 nanocrystals decreases gradually and the corresponding quantum efficiency decreases. Moreover, the thermostability and photostability of CsPbBr3 QD@glasses were also studied systematically. The correlation between the rigidity of the glass network structure and the local microenvironment of the crystallization of CsPbBr3 QDs is revealed. Our results provide a reference for the design of mother glass to obtain perovskite QDs with high quantum efficiency and high stability based on the rigidity of the glass network.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6337-6343
·
IF 1.938
Zhang Lu,Gao Yunlong,Cao Peiyuan,Yang Bobo,Zhang Xiaoyu,Ming Yu,Zheng Fei,Zou Jun
The all-inorganic cesium lead halide perovskite CsPbBr 3 exhibits excellent optical properties such as large absorption cross-section, high fluorescence quantum yield (PLQY), and narrow emission peak. However, how to improve the stability of CsPbBr 3 quantum dots has been a major challenge for their optoelectronic application. Here, a room-temperature process for synthesizing CsPbBr 3 @SiO 2 using 3-(dimethoxymethylsilyl)propylamine (DEMSPA) as precursor is reported, being a simple and facile process without inert gas. With the help of DEMSPA, a complete shell structure formed by silane can be coated. The results of x-ray diffraction analysis, transmission electron microscopy, and high-resolution transmission electron microscopy revealed that the prepared CsPbBr 3 had good crystallinity with cubic phase structure. The luminescent properties of the products were evaluated by photoluminescence spectroscopy and fluorescence lifetime measurements. DEMSPA contains an amino group (–NH 2 ) that could promote the absorption of light. The prepared CsPbBr 3 @SiO 2 emitted an adjustable green wavelength (521 nm to 533 nm) with high PLQY. The light-emitting diode encapsulated with CsPbBr 3 @SiO 2 showed a cold-white light characteristic.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 36
·12118-12123
·
IF 7.393
Bohan Li,Yuchi Zhang,Yan Xu,Zhiguo Xia
CsPbBr3 nanocrystals (NCs) with highly efficient narrow-band green emission are promising candidates in display applications. However, the poor stability of CsPbBr3 NCs is always a challenge for future development. Herein, we designed and prepared CsPbBr3 NCs encapsulated into zeolite Beta (denoted as CsPbBr3-Beta) composite via an optimized high temperature solid-state method, and the as-obtained power materials exhibited green emission peaking at 520 nm with a narrow full-width at half-maximum (FWHM) of 25 nm and a high photoluminescence quantum yield (∼61%). We further demonstrated the ultra-high luminescent stability of CsPbBr3-Beta composite by treating under a 150 °C treatment, soaking in water over 30 days, as well as applying in 450 nm light-emitting devices (LED) for 20 days. Ultimately, white-light-emitting devices (WLEDs) constructed by the green-emitting CsPbBr3-Beta composite and commercial blue chip and red K2SiF6:Mn4+ phosphor achieved a color gamut of 123.5% National Television System Committee standard (NTSC) and high luminous efficiency (LE = 95 lm W−1). This work highlights the encapsulation process and feasible solid-state reaction methodology to fabricate CsPbBr3 NCs confined in a microporous molecular sieve with high luminescent stability and performance, significantly expanding its great potential to be used in optoelectronic fields.
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