Coatings
·
2022
·Vol. 12
·期 4
·512
·
IF 3.236
Song Wang,Yan Xu,Renjie Chen,Mengmeng Zhu,Muyi Wang,Mengmeng Cao,Yunpeng Liu,Haojie Ding,Shulan Zhang,Jueyao Bai,Jun Ren,Tongtong Xuan,Huili Li
All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zhengchang Xia,Ji Jiang,Aoxing Wang,Di An,Zhouxin Li,Huaiwen Zheng,Zhigang Yin,Gufeng He,Jingbi You,Xingwang Zhang
Metal halide perovskites hold great promise for display technologies owing to their excellent optoelectronic properties. Recent advances in perovskite light-emitting diodes (PeLEDs) have improved their efficiency, brightness, and operational stability, but simultaneously boosting these metrics remains challenging. Additionally, other critical metrics such as power consumption, color purity, and gamut have received little attention. Here, a co-additive approach is proposed to regulate the perovskite crystallization, enabling the synthesis of CsPbBr 3 &Cs 4 PbBr 6 dual-phase nanocrystals (NCs) and the formation of nanoscale concave-convex morphology, as well as to change its semiconductor polarity by molecular doping. Due to the reduced defect density, balanced charge injection, and improved light extraction efficiency, the PeLEDs achieve a remarkable external quantum efficiency (EQE) of 28.2%, a high brightness of over 150000 cd m −2 and a T 50 lifetime of 4291 h, along with an ultra-narrow spectral linewidth (16.5 nm), an ultra-low driving voltage (1.9 V), and a superior Rec. 2020 color gamut coverage (CGC) of 92%.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 24
·9445-9453
·
IF 4.569
Yifei Zhao,Fangrui Cheng,Shuai Zhang,Ruirui Yang,Man Li,Hong Ming,Shi Ye
The instability of all-inorganic perovskite nanocrystals (NCs) remains a major challenge to their practical applications in displays and lighting. In order to improve their environmental resistance, highly luminescent CsPbBr3 NC embedded Cs4PbBr6 microcrystals (MCs) have been fabricated by an anti-solvent reprecipitation method with the assistance of 1-alkyl-3-methyl-imidazolium bromides. The heterostructure of the MCs is investigated in detail, and their formation mechanism is discussed in terms of the dissolution–precipitation equilibria and the total energy of variously scaled nanoparticles via density functional theory (DFT) calculations. Although the imidazolium ligands are not directly capping with the inner CsPbBr3 NCs, they are important to the formation of these MCs. The MCs exhibit better thermal resistance compared to conventional CsPbBr3 NCs prepared by the hot-injection method. Additionally, a prototype white light-emitting diode (WLED) was fabricated to demonstrate its practical application prospects. Thanks to the narrow emission bands and enhanced stability of the MCs, the WLED shows greater performance compared to bare perovskite NCs, indicating its great potential as a green phosphor in lighting and display applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chenxu Wang,Lihe Yan,Jinhai Si,Tianyu Huo,Xun Hou
All-inorganic lead halide perovskites nanocrystals (NCs) have been demonstrated to be promising candidates for optoelectronic devices, but preparing perovskite NCs with high photoluminescence quantum yields (PLQYs) and excellent stability has been a challenge. In this work, CsPbBr 3 /Cs 4 PbBr 6 core/shell NCs with a PLQYs of 87.23% and long-term stability in ambient environments was prepared by room temperature inverse microemulsion method. The excellent stability of the sample was attributed to the protection of Cs 4 PbBr 6 , and higher PLQYs could be owing to the passivation effect of the core/shell structure. To illustrate the distribution of photogenerated carrier in the core/shell structure, a confined excitons model was proposed based on time-resolved PL and temperature dependent PL measurements. Femtosecond time-resolved transient absorption spectra measurements were performed upon different excitation wavelength to unveil the photogenerated carrier dynamics in core/shell NCs. Upon 300 nm excitation, a carrier transfer process with the time of 3.18 ps from shell to core layer was observed. Furthermore, both two- and three-photon absorption PL was discovered in core/shell NCs, further verifying the carrier transfer process.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·355
·
IF 5.3
Longshi Rao,Bin Sun,Yang Liu,Guisheng Zhong,Mingfu Wen,Jiayang Zhang,Ting Fu,Shuangxi Wang,Fengtao Wang,Xiaodong Niu
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr3/Cs4PbBr6composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr3/Cs4PbBr6composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs4PbBr6matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6-LP are significantly improved compared to CsPbBr3quantum dots and CsPbBr3/Cs4PbBr6composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr3/Cs4PbBr6-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr3/Cs4PbBr6-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC.Keywords:ultrasonication;liquid paraffin;CsPbBr3/Cs4PbBr6;white-light-emitting diodes;visible light communication
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingyun He,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Here, polyvinyl butyral (PVB) films-protected CsPbBr 3 /Cs 4 PbBr 6 halide perovskite solids (HPSs) were successfully synthesized. The optical properties and structure of HPSs@PVB were studied, finding the photoluminescence quantum yields (PLQYs) of this novel composite material is as high as 60.4%. More importantly, HPSs@PVB has excellent thermal cyclability, water and ultraviolet (UV) resistance. In addition, HPSs@PVB was further applied to light emitting diodes (LEDs) and displays. By combining green-emitting HPSs@PVB and red-emitting CsPbBrI 2 NCs@PVB with InGaN 460 nm blue chip, white light emitting diode (WLED) device can be successfully fabricated. And the device exhibits good stability and the color gamut is as wide as 126%, reaching 94% of Rec. 2020. This work proposes a simple approach to solve the challenging stability issue of perovskite nanocrystals (NCs), having a positive implication for their practical application in LEDs and display backlights.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Ying Li,Rong Song,Jiaming Liu,Jun Qian,Xin Wang
Inorganic perovskites show excellent advantages over traditional quantum dots (QDs) and have great potential for application in light-emitting devices, display devices, and other fields. In this paper, CsPbBr3/Cs4PbBr6 QDs with different cesium-to-lead ratios are synthesized in one step at room temperature and in a simple environment without protective measures. Among them, the perovskite powder with a photoluminescence quantum yield (PLQY) of 54% and a series of ink additives are formulated into a perovskite fluorescent ink with high stability and printability. The inks are used not only for printing but also for writing with simple and convenient application conditions in mass production. Finally, the inks are used to combine ZnS:Cu flexible alternative current electroluminescent (ACEL) devices to produce two different structures of light conversion flexible ACEL devices in a full-printing manner. The material loss and cost of the devices are very low. Pattern drawing and printing can be performed selectively. Among them, the P-outside structure ACEL device has a high lumen efficiency of 77.43 lm/W, which shows the application potential of the ink in ACEL devices and promotes the process of perovskite materials from laboratory to industrial applications.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 1
·373-380
·
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
Advanced Materials Technologies
·
2021
·Vol. 6
·期 12
·2100654
·
IF 7.848
Ze Wang,Yaqian Zhang,Xiaodong Liu,Yanxia Yu,Fucai Xu,Jing Ding,Xiaojuan Liang,Keqin Yang,Weidong Xiang
In this study, a simple low-temperature self-assembly strategy is used to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepared CsPbBr 3 /Cs 4 PbBr 6 nanocomposite exhibits the reversible luminescence phenomenon by simply applying the wetting and drying process. This abnormal phenomenon is due to the internal phase transformation of the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite. The potential application of the nanocomposite in anti-counterfeiting has been demonstrated. This work facilitates the production and application of inorganic metal halide perovskite-based functional materials.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5374-5383
·
IF 4.682
Qin Wenjing,Zheng Kai,Liu Hengchao,Chu Jingting
The CsPbBr 3 /Cs 4 PbBr 6 perovskite composite material has received wide attention due to its good stability and photoelectric properties, and it is promising to appear in various photoelectric applications. However, there are still some challenges in how to control the synthesis of this material and obtain the balance between high fluorescence efficiency and well stability. In this study, we proposed a rapid anti-solvent vapor-assisted method to prepare CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) with hexagonal tower structure. It is found that oleic acid and oleamine can effectively control the morphology, grain size and optical properties of the material. This unique hexagonal tower structure CsPbBr 3 /Cs 4 PbBr 6 MCs has excellent optical properties, showing strong green emission at 514 nm and PLQY of 78.4 ± 4.3%, with a narrow full width at half maximum value of 20 nm. In addition, environmental stability experiments have shown that after 6 months of storage under 50% relative humidity, the PL strength loss is lower than 20%. Graphical Abstract
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高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 25
·45376-45392
·
IF 3.833
Longshi Rao,Longshi Rao,Bin Sun,Bin Sun,Qing Zhang,Qing Zhang,Mingfu Wen,Mingfu Wen,Jiayang Zhang,Jiayang Zhang,Guisheng Zhong,Guisheng Zhong,Guisheng Zhong,Ting Fu,Xiaodong Niu,Xiaodong Niu,Yong Tang
Benefit from their near-unity photoluminescence quantum yield (PL QY), narrow emission band, and widely tunable bandgap, metal halide perovskites have shown promising in light-emitting applications. Despite such promise, how to facile, environmentally-friendly, and large-scale prepare solid metal halide perovskite with high emission and stability remains a challenging. Herein, we demonstrate a convenient and environmentally-friendly method for the mass synthesis of solid CsPbBr3/Cs4PbBr6 composites using high-power ultrasonication. Adjusting key experimental parameters, bright emitting CsPbBr3/Cs4PbBr6 solids with a maximum PL QY of 71% were obtained within 30 min. XRD, SEM, TEM, Abs/PL, XPS, and lifetime characterizations provide solid evidence for forming CsPbBr3/Cs4PbBr6 composites. Taking advantage of these composites, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6 are much improved compared to CsPbBr3. We further demonstrated CsPbBr3/Cs4PbBr6 use in flexible/stretchable film and high-power WLEDs. After being subjected to bending, folding, and twisting, the film retains its bright emission and exhibits good resistance to mechanical deformation. Additionally, our WLEDs display a superior, durable high-power-driving capability, operating currents up to 300 mA and maintaining high luminous intensity for 50 hours. Such highly emissive and stable metal halide perovskites make them promising for solid-state lighting, lasing, and flexible/stretchable display device applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Cong He,Chunwen Ye,Meng Wu,Shiwei Yang,Peiyuan Zhuang,Jiawei Song,Yanjie Zhang
Halide perovskite nanocrystals (NCs) including CsPbBr 3 as the most typical composition , have attracted widespread attention due to their excellent photovoltaic properties . However, CsPbBr 3 NCs encounter the serious problem of instability and luminescent quenching when removing protection from their colloidal solution. Herein, a facile room-temperature saturation recrystallization process is employed to form CsPbBr 3 NCs with an average particle size of ∼1.8 nm on the surface of Cs 4 PbBr 6 support through adjusting Cs/Pb molar ratios (1−10). Interestingly, CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 exhibit an ultra-high quantum yield of ∼98 %. Accordingly, the photoluminescence intensity of CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 is greatly enhanced by about 2900-fold higher than the sample with a Cs/Pb ratio of 1 due to the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunction structure. Subsequently, CsPbBr 3 /Cs 4 PbBr 6 powders are encapsulated in a SBA-15 mesoporous silica and calcined at 700ºC to improve water-resistance properties, which can keep stable in water for more than 100 days. These CsPbBr 3 /Cs 4 PbBr 6 -SBA-15 composites show potential applications in white light-emitting diodes, display light sources , and flexible luminescent films in the field of wearable devices. This work provides a facile way to achieve ultra-high quantum yield through the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunctions .
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