DALTON TRANSACTIONS
·
2024
·
IF 3.5
Weiwei Chen,Lin Hu,Yi Wang,Lei Huang,Zhen Wang,Xiaosheng Tang
With many fascinating characteristics, such as color-tunability, narrow-band emission, and low-cost solution processability, all-inorganic lead halide perovskite quantum dots (QDs) have attracted keen attention for electroluminescent light-emitting diodes (QLEDs) and display applications. However, the performance of perovskite QLED devices is intrinsically limited by the inefficient electrical carrier transport capacity. Herein, one facile but effective method is proposed to enhance the perovskite QLED performance by incorporating a short carbon chain ligand of 2-phenethylammonium bromide (PEABr) to passivate the CsPbBr3 QD surface. With the PEABr ligand, the Br− vacancies are passivated, which could eliminate nonradiative recombination of perovskite QDs; thus their optical properties are enhanced. Meanwhile, PEABr can interact with perovskite QDs to adjust the perovskite film morphology, resulting in low current leakage and efficient electron injection. After the PEABr treatment, the CsPbBr3 QD film exhibits strong green emission located at 516 nm, with an average photoluminescence lifetime of 45.71 ns and a photoluminescence quantum yield of up to 78.64%. In addition, the surface roughness of the CsPbBr3 QD film is reduced from 3.61 nm to 1.38 nm, which is essential to prepare a QD film with high surface coverage. As a result, the QLED device with PEABr treated CsPbBr3 QDs exhibits a maximum current efficiency of 32.69 cd A−1 corresponding to an external quantum efficiency of 9.67%, 3.88-fold higher than that of the control device (pure QDs as an emission layer). This research provides an effective strategy for the improvement of the perovskite QLED performance and may be helpful for extending their actual applications.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Kangwu Zheng,Xingling Li,Weicheng Yao,Haoran Zhang,Wei Li,Xuejie Zhang,Bingfu Lei
All-inorganic cesium lead bromine perovskite quantum dots (CsPbBr 3 QDs) have emerged as promising semiconductor nanomaterials for display applications owing to their high photoluminescence quantum yields (PLQY) and narrow-band emission. However, their inherent instability under environmental stressors such as moisture, heat, and light severely limits their practical application. Herein, we proposed a dual-action synergistic approach that integrates chemical passivation with rigid encapsulation to overcome these limitations. Specifically, the sulfonic acid-based surfactant (SB3–18) coordinates with the unpassivated Pb 2 + sites on the CsPbBr 3 QDs surface to effectively to suppress surface trap states, while high-temperature sintering of mesoporous silica (MS) templates triggers pore collapse to form a dense protective matrix against environmental degradation. Structural and spectroscopic analyses corroborated the effectiveness of the approach. The optimized CsPbBr 3 -SB3–18/MS composites demonstrates enhanced stability, exhibiting excellent photostability and water-resistance, and good thermostability compared with the same stability test conditions as the material without the addition of SB3–18. The color gamut coverage of the as-prepared backlit white LED reaches 125.3 % of NTSC and 93.6 % of the Rec.2020. This work introduces a novel strategy integrating defect engineering and robust encapsulation within a high-temperature solid-phase synthesis approach to enhance the performance of perovskite nanomaterials.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Qingyuan Zhou,Xiaohu Zhao,Yuanchen Jiang,Junwei Zhou,Zhen Liu,Kai Pan
One-dimensional CsPbBr3 nanocrystals (NCs) possess significant potential in laser and photodetection fields due to their longer carrier lifetimes, more efficient carrier transport, and anisotropic optical properties. In recent years, Cs4PbBr6 has been employed to synthesize highly luminescent one-dimensional CsPbBr3 NCs; however, the poor stability of CsPbBr3 NCs produced by this method has limited their practical applications. In this study, CsPbBr3 nanorods (NRs) were prepared by removing CsBr from Cs4PbBr6 using a postsynthetic method. Water was added dropwise to Cs4PbBr6 NCs dispersed in a nonpolar solvent. Due to the high solubility of CsBr in water, the Cs4PbBr6 NCs rapidly converted into CsPbBr3 NCs. At this point, the addition of water-induced dipole–dipole interactions within the system drives the self-assembly of CsPbBr3 NCs into NRs. As the amount of water increased, the local concentration of CsPbBr3 NCs also rose, raising the probability of collisions between CsPbBr3 NCs and resulting in the formation of longer NRs. Subsequently, benzoic acid was introduced to replace the ligands removed along with CsBr. Due to the surface passivation effect of benzoic acid, the stability and photoluminescence performance of the CsPbBr3 NRs were significantly enhanced. The resulting CsPbBr3 NRs exhibited a fluorescence lifetime of 45.97 ns and achieved a high photoluminescence quantum yield (PLQY) of 94.2%. Stability tests showed that the ligand-passivated CsPbBr3 NRs retained 65% of their initial photoluminescence intensity after one month of storage in an open atmospheric environment.
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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
Laser & Photonics Reviews
·
2021
·Vol. 15
·期 10
·2100278
·
IF 13.138
Qionghua Mo,Chen Chen,Wensi Cai,Shuangyi Zhao,Dongdong Yan,Zhigang Zang
The photoluminescence quantum yield (PLQY) of CsPbBr 3 perovskite nanocrystals (NCs) prepared by the hot-injection method can exceed 90%, which have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole hot-injection experiment requires air isolation and relatively high temperature. In addition, the poor stability of CsPbBr 3 NCs impedes their applications. Here, a facile method is reported to synthesize CsPbBr 3 @ZrO 2 NCs at room temperature in air. Owing to using ZrO 2 coated CsPbBr 3 NCs, the prepared CsPbBr 3 @ZrO 2 NCs not only present a PLQY of 80% but also exhibit an enhanced stability to heat and moisture. Furthermore, WLEDs are fabricated with CsPbBr 3 @ZrO 2 NCs and commercial red phosphors (CaAlSiN 3 :Eu 2+ ) on blue LEDs chips. The fabricated WLEDs exhibit a correlated color temperature (CCT) of 4743 K and luminous efficacy as high as 64.0 Lm W –1 . In addition, visible light communication with a high data rate of 33.5 Mbps is achieved using the WLEDs. This work provides a room temperature strategy to coat zirconia for CsPbBr 3 @ZrO 2 NCs, benefiting to enhance the optical performance and stability, as well as the promotion of the great potentials in solid-state illuminating and visible light communication applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Luo,Yuqiong Huang,Hongli Liu,Bao Zhang,Jian Song
Stability issue of blue emitting CsPbX 3 quantum dots (QDs) remains a great challenge for their application in optoelectronic devices. In this work, hydrophobic ionic liquids (ILs) 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (NTf 2 ) were used to obtain blue emission CsPbBr 3 QDs with high color purity featured with a 16 nm full width at half-maximum (FWHM). Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results elucidated ILs formed effective passivation on QDs through stronger interaction with surface Pb 2+ compared to OA/OAm. This passivation effect led to the enhancement of photoluminescence quantum yields (PLQYs) from 33% for the pristine sample to 51% for QDs modified by ILs. And the stability of the modified QDs was enhanced by keeping the blue emitting even after 32 h UV irradiation. More interestingly, there is an alkyl chain effect existed that QDs with longer alkyl chain ILs exhibit better stability than the ones with shorter alkyl chains. It may relate to the higher hydrophobicity originated from long alkyl chain. Resultantly, Warm white light emitting diode (WLED) based on the IL-contained QDs was fabricated which qualified with a Commission Internationale de L'Eclairage (CIE) color coordinates of (0.33,0.35), Correlated color temperature (CCT) of 5416 K and maximum luminance of 9062.9 cd/m 2 . The demonstrated ILs passivation strategy might be an effective method for preparing blue emitting perovskite QDs with high PLQYs and stability.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Jun Cui,Fanfan Xu,Quan Dong,Junjie Jia,Lili Liu,Shuifu Liu,Fengli Yang,Xinyu Ye
All inorganic cesium lead halide perovskite nanocrystals have attracted widespread attention due to their excellent optical properties. However, large-scale synthesis of high photoluminescence quantum yield (PLQY) CsPbBr 3 nanorods (NRs) is still challenging. Herein, we report a facile, low-cost and large-scale synthesis of CsPbBr 3 NRs with 86 % PLQY at room temperature, in which the employment of acetic acid as precursor solvent promoted the concentrations of Cs + and Pb 2+ in the precursor solution and dominated the formation of CsPbBr 3 NRs. The synthesized CsPbBr 3 NRs with an average width of around 8 nm and average lengths of 18–30 nm have an excellent narrow-band (FWHM = 17 nm) green emission peaked at 517 nm.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 45
·21441-21450
·
IF 7.233
Yuting Cai,Le Wang,Tianliang Zhou,Peng Zheng,Ye Li,Rong-Jun Xie
All-inorganic lead halide perovskite quantum dots (PQDs) have shown great promise for optoelectronic applications due to their unique optical and electrical properties. However, their poor stability against moisture, UV light or thermal attacks greatly hinders their practical applications. One of the reasons for this instability is the proton transfer between oleic acid (OA) and oleylamine (OLA), which induces serious ligand loss. The idea of this work is to prevent the interligand proton transfer by replacing OLA with cetyl trimethylammonium bromide (CTAB) that cannot be protonated. The synthesized CsPbBr3 PQDs in solution show high photoluminescence quantum yields up to 71% and also exhibit higher stability against acetone than the counterparts synthesized using oleylammonium bromide (OLABr). Subsequently, CsPbBr3 PQDs with a peak wavelength of 515 nm (g-CsPbBr3) synthesized using CTAB are further composited with a polymer of carboxyl-functionalized polystyrene (cPS). The composite shows enhanced thermal and moisture stability. It is demonstrated that this green-emitting composite can produce high color gamut (130%) white light-emitting diodes when combined with the K2SiF6:Mn4+ phosphor and a blue InGaN chip, enabling its use in display backlights.
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高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 3
·036003
·
IF 2.142
Xiaoyu Zhang,Peiyuan Cao,Bobo Yang,Yunlong Gao,Xun Hong,Yu Ming,Fei Zheng,Yaoqing Chu,Jun Zou
Embedding cesium lead bromide perovskite quantum dots (PQDs) into silica matrix has been proved as an efficient way to enhance the stability of PQDs. Here, we firstly report 3-(Dimethoxymethylsilyl)propylamine (DEMSPA) as a precursor to form coating shell. The PQDs solution and DEMSPA were mixed in the open air at the room temperature. The final product was extracted from the sol-gel solution. The luminescent properties of QDs is over 60 d of storage under ambient conditions. The PQDs/SiO2 composite powder possesses the photoluminescence quantum yield (PLQY) of 63.5%. Coating the powder on the blue chips, the white light-emitting diode (LED) exhibits a wide color gamut with 123.6% of National Television System Committee (NTSC) color triangle area. The PQDs/SiO2 composite has been proved cubic phase structure, indicating good crystallinity. The good crystallinity enables QDs to be applied as broad optoelectronic devices.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2408
·
IF 5.076
Kailin Chi,Hansi Xu,Bingtao Feng,Xianwei Meng,Daoyu Yu,Qian Li
Due to the low solubility of CsBr in organic solvents, the CsPbBr3film prepared by the multi-step method has holes and insufficient thickness, and the light absorption capacity and current density of the perovskite film hinder the further improvement in the power conversion efficiency (PCE) of CsPbBr3solar cells. In this study, we introduced InBr3into the PbBr2precursor solution and adjusted the concentration of PbBr2, successfully prepared PbBr2with a porous structure on the compact TiO2(c-TiO2) substrate to ensure that it fully reacted with CsBr, and obtained the planar carbon-based CsPbBr3solar cells with high-quality perovskite film. The results reveal that the porous PbBr2structure and the increasing PbBr2concentration are beneficial to increase the thickness of the CsPbBr3films, optimize the surface morphology, and significantly enhance the light absorption capacity. Finally, the PCE of the CsPbBr3solar cells obtained after conditions optimization was 5.76%.
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 18
·2200683
·
IF 10.05
Huanxin Yang,Rui Yun,Changjiu Sun,Yiyue Chu,Guodong Su,Mingjian Yuan,Suli Wu,Libing Zhang,Xiyan Li
Quasi 2D metal halide perovskite nanoplatelets (NPls), as a kind of important materials to achieve pure blue emission, attract significant attention in pursuit of high gamut trichromatic display. However, in-depth study on the specific growth processes of NPls is still lacking due to the ultrafast reaction rate. Here, a single ligand passivation strategy to investigate the concrete growth mechanism of NPls is proposed, in which the PbBr x (OAm) y clusters play a pivotal template role in guiding the growth of crystals, and the final products with 3-monolayer (3ML) are grown from the intermediate 2ML NPls instead of being synthesized directly. Based on the new discovery about growth mechanism of NPls, the reaction time has been shortened from hours to seconds by introducing hydrobromic acid and ethanol. The ethanol used here is considered as an accelerator for the transition from 2ML to 3ML NPls rather than an initiator for nucleation of products, which is different from the generally accepted viewpoints. With further passivation of hydrobromic acid, the synthesized 3ML NPls show 462 nm emission with quantum yield of 97.04% and great photostability. The novel growth model proposed in this work will provide a paradigm for future design and optimization of new synthesis schemes.
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高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Xiaopeng Han,Xin Wang,Jianyong Feng,Huiting Huang,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
It is important to prepare preferentially oriented films to enhance charge carrier transport in the optoelectronic device applications. For the promising optoelectronic material of CsPbBr3, obtaining its thin films with preferred crystal orientation is highly desirable yet challenging. Herein, (121)-oriented CsPbBr3 perovskite films were successfully obtained by using HBr as the additive for PbBr2 precursor solution in the two-step solution method. Detailed investigations indicate that microstructure tailoring of PbBr2 films via HBr additives plays a crucial role in achieving (121)-oriented CsPbBr3 films. Theoretical calculations and experimental measurements demonstrate high carrier mobility in (121)-oriented CsPbBr3 films, which accords well with photovoltaic tests that the (121)-oriented CsPbBr3 film shows short-circuit photocurrent density as much as 1.68 times than the (101)-oriented one. In comparison with the (101)-oriented CsPbBr3 solar cell, the champion power conversion efficiency of the (121)-oriented CsPbBr3 solar cell increases from 2.56 to 6.91% owing possibly to its higher coverage and carrier mobility. This work not only develops a pathway to prepare compact (121)-oriented CsPbBr3 films but also highlights the importance of crystal orientation engineering in perovskite films for high-performance optoelectronic devices.
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