Journal of Materials Chemistry C
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2024
·Vol. 12
·期 25
·9385-9391
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IF 5.7
Yue Zhai,Kecheng Dai,Tongtong Xuan,Wenhao Bai,Shuchen Shi,Hong Zhang,Rongjun Xie,Le Wang
All-inorganic cesium lead halide perovskite materials have potential applications in mini/micro-LED display applications due to their excellent photoelectric properties. However, these materials have an uncontrollable tendency to form large-sized crystals and poor stability, which is not conducive to miniaturized optoelectronic applications. Herein, a novel Cs4PbBr6@KBr color conversion film (Cs4PbBr6@KBr CCFs) with both excellent luminescence properties and high stability was in situ constructed by using inkjet printing technology. The improvement in performance is attributed to the reduction in perovskite defects within the structure and the isolation of oxygen and water by the surface modification layer, which is related to the higher solubility product of KBr. The Cs4PbBr6@KBr CCFs printed on a PET flexible substrate present a high-resolution dot matrix of 16.7 μm and a homogeneous and bright green emission with a high photoluminescence quantum yield of 94%. Moreover, the Cs4PbBr6@KBr CCFs retain 65% of their initial intensity after being aged at 70 °C for 16 h, which is superior to that of perovskite CCFs without the coating of KBr. These results indicate that the Cs4PbBr6@KBr composite has excellent potential in realizing mini/micro-LED displays with high resolution and anti-counterfeiting lables.
研究领域:
材料科学
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光电子学
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显示技术
·
纳米技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 16
·4733-4739
·
IF 6.641
Guomiao Hu,Wenjing Qin,Manman Liu,Xiaoxue Ren,Xiaoming Wu,Liying Yang,Shougen Yin
All-inorganic halide perovskites have attracted significant attention because of their excellent photoelectric performance. However, several remaining challenges, including large-scale synthesis, strict limitations on the experimental conditions, and material stability, limit their practical application. In this study, we propose a simple ligand-assisted supersaturated recrystallization (LASR) procedure in order to prepare perovskite-related plum-pudding-like Cs4PbBr6/CsPbBr3 microcrystals (MCs) on a large scale and at room temperature. The LASR approach was proved to rely on the selection of an appropriate antisolvent. The synthesized Cs4PbBr6/CsPbBr3 MCs exhibit strong green emission at 520 nm with a narrow full-width at half-maximum (FWHM) value of 20 nm originating from the CsPbBr3 nanocrystals (NCs) embedded in the Cs4PbBr6 MCs. Additionally, the environmental stability experiment showed ∼20% PL intensity loss after storage under ambient conditions with 50% relative humidity (RH) for 2 months.
研究领域:
材料科学
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纳米技术
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光电子学
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钙钛矿材料
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DOI
高影响因子
ADVANCED MATERIALS
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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%.
研究领域:
材料科学
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光电技术
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产品关联
DOI
PubMed
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 10
·2200020
·
IF 0
Yu Qiao,Yanan Li,Yanwei Huang,Hongliang Dong,Qiangqiang Wang,Wei Xie,Heping Zeng
Herein, a controlled synthesis route with precise growth tunability of perovskite Cs 4 PbBr 6 micro-flakes and micro-flowers with embedded CsPbBr 3 nanocrystals (Cs 4 PbBr 6 @CsPbBr 3 ) is elaborated. This room-temperature synthesis scheme initiates the nucleation and growth process of the majority crystalline phase of Cs 4 PbBr 6 with a few CsPbBr 3 impurities as confirmed by the X-ray diffraction studies. The microstructures and shape control are further investigated by scanning electron microscopy (SEM) and the high-resolution transmission electron microscopy (HRTEM). The results depict hexagonal Cs 4 PbBr 6 micro-flakes with embedded CsPbBr 3 that can spontaneously self-assemble into micro-flowers with varying external conditions. This approach gives access to perovskite semiconductors with both structural and excellent optical properties by correlating the dimensionality with quantum confinement effects. The photoluminescence, absorption, and time-resolved photoluminescence spectroscopy confirm that such as-synthesized materials exhibit bright green emission with an optical bandgap of 2.3 eV. Lasing action is obtained under an excitation wavelength of 400 nm at 10 K where the light intensity and lifetime are examined at different pump fluences. There exist two linear regions corresponding to spontaneous emission and lasing, respectively. The lower lasing threshold of 27 μJ cm −2 per pulse is obtained and the corresponding Q factor is estimated to be 1090.
研究领域:
材料科学
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光电子学
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纳米光子学
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半导体物理
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Kaixiang Huang,Dongmei Li,Liu Yang,Song Liu,Fan Yang
All-inorganic cesium lead halide , a kind of promising semiconductor materials with fantastic properties for photoelectronic and photovoltaic applications, emerged recently. Herein, we report new strategies for synthesizing of trigonal Cs 4 PbBr 6 nanodisks (NDs), which are also of ultrahigh luminescent (PLQY reached 85%). The key points to the high-yield synthesis of perovskite NDs are the elevated concentration of Cs precursor and proper temperature. Transmission electron microscopy studies of reaction products at various stages of the synthesis reveal that the Cs 4 PbBr 6 NDs are built due to a selectivity of the ligands capping the different facets of a seed. Particularly, we find that by using cesium acetate as cesium source instead of cesium carbonate, the geometric construction of NDs is more defined, which indicates that the extra anions have a substantial effect on the perovskite crystal growth kinetics and their morphologies. Our work presents a new opportunity for better understanding the effect of composition, surface chemistry and intrinsic efficient luminescence in perovskite nanoparticles .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Shudong Yu,Ting Fu,Xiaodong Niu
Cesium lead halide perovskite crystals have attracted widespread attention due to their excellent photoelectric properties. However, their intrinsic instability and the photoluminescence quantum yield (PLQY) sharply dropped in the solid-state limit their practical applications. Besides, the current synthesis strategies either need a variety of ligands, or an anti-solvent, which will result in potential environmental risks. Herein, we address the above issues simultaneously by embedding CsPbBr 3 in a large bandgap Cs 4 PbBr 6 matrix by high-speed mechanical mixing without using any ligands and highly toxic anti-solvent. Changing the molar ratio of PbBr 2 /CsBr, centrifugation time, and the solution concentration, the optimized CsPbBr 3 /Cs 4 PbBr 6 show a high PLQY of up to 79%. In addition, mechanistic studies show that the origin of green luminesce of CsPbBr 3 /Cs 4 PbBr 6 microcrystals is closely related to the CsPbBr 3 inclusion theory, but not to the Br vacancy theory, in which CsPbBr 3 embedded in Cs 4 PbBr 6 to form a CsPbBr 3 /Cs 4 PbBr 6 heterostructure . By taking advantage of the heterostructure, the photostability and thermostability of CsPbBr 3 /Cs 4 PbBr 6 are significantly enhanced. In addition, the high optical and temperature/humidity-stable performances of CsPbBr 3 /Cs 4 PbBr 6 are verified by applying them to white LEDs (WLEDs). The electroluminescence intensity of WLEDs remains 70% of the original one after being stored in a chamber with high temperature and high humidity (85 °C/RH 85%) for 40 h, and the device displays luminous efficiency of 74.5 lm/W at 20 mA. This result provides a solid foundation for their scale applications in lighting, displays, and other optoelectronic and photonic devices.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Zong-Tao Li,Bo-Jia Li,Jia-Sheng Li,Cun-Jiang Song,Xin-Rui Ding,Hai-Long Yuan,Bin-Hai Yu,Yong Tang,Jian-Zhen Ou,Romain Gautier,Hong-Lei Ji,Hao-Chung Kuo
Although stable perovskite phosphors, i.e., CsPbBr 3 /Cs 4 PbBr 6 , were extensively reported and made great progress, achieving strong photoluminescence (PL) energy outcoupling remains challenging owing to their short Stoke’s shift with serious PL energy absorption. This study utilized internal resonant scattering (IRS) to improve the PL energy outcoupling (PEO) of CsPbBr 3 /Cs 4 PbBr 6 perovskite phosphor, which was realized by the nanopore-packing perovskite particles (NP-PPs) structure inside a phosphor. The nano-porous matrix hybrid solid–liquid interfacial reaction was developed to construct NP-PPs in a phosphor, and it is optimized to achieve a denser NP-PP structure with an enhanced PEO effect (2.8-fold enhanced PL intensity). Numerical results revealed that the NP-PP structure transforms the PL energy absorption mode to the IRS mode, most of the scattering PL energy evades NP-PPs instead of propagating inside. The optimized phosphor was applied to white devices, and we finally achieved an ultrahigh luminous efficacy of 131.32 lm/W based on green perovskite phosphors. This study provides a general guide for efficient perovskite phosphors utilizing the nano-porous matrix to enable the IRS effect.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Cong He,Chunwen Ye,Meng Wu,Shiwei Yang,Herui Zhao,Yiping Wu,Yanjie Zhang
Zero-dimensional quantum dots (QDs) with formulas of Cs4PbX6 and CsPbX3 (X = I, Br, Cl) have emerged in recent years for next-generation functional materials in optoelectronics fields. However, CsPbX3 and Cs4PbX6 QDs are unstable when separated from colloidal solution, still less enduring thermal and water attack. Herein, lithium disilicate glass ceramics, a fantastic dental restorative material with excellent mechanical properties and good semitransparency, have been used as the rigid armor to keep CsPbBr3/Cs4PbBr6 QDs away from destructive environmental influences. Notably, lithium disilicate glass ceramics can effectively prevent the aggregation and further growth of QDs even at a high calcination temperature (600 °C), while the average particle sizes of the QDs in lithium disilicate glass ceramic are only ∼3.3 nm. The CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline prepared at 600 °C exhibits intense green emission at ∼520 nm with a greatly enhanced emission intensity of ∼5.1 times that of the sample prepared at 500 °C. Interestingly, the abnormal luminescence enhancement (∼195%) appeared after the as-prepared CsPbBr3/Cs4PbBr6 quantum dot glass microcrystalline was immersed in water for 72 h. The ultrastable CsPbBr3/Cs4PbBr6 QDs glass microcrystalline exhibits great potential in lighting and displays fields similar to traditional inorganic phosphors.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-12
·
IF 6.232
Li Zhe,Chen Xiaolan,Yu Lei,Li Huijuan,Chen Lu,Kang Qi,Shen Dazhong
A smartphone-based ratiometric fluorescence device was designed to monitor the reaction kinetic process under vigorous mixing conditions, demonstrated by the hydrolysis of Cs 4 PbBr 6 nanocrystals (NCs). In the presence of trace water, part of Cs 4 PbBr 6 NCs (non-fluorescent) was converted to CsPbBr 3 NCs (strong fluorescent). Using anthracene as the reference fluorophore, the brightness ratio of the green (from CsPbBr 3 NCs) to blue (from anthracene) components in the fluorescence image which was recorded in situ by the smartphone camera was measured as the signal for kinetic analysis. It was shown that the water-triggered conversion reaction from Cs 4 PbBr 6 NCs to CsPbBr 3 NCs follows the pseudo-second-order kinetic model in the early rapid hydrolysis stage (up to 4 min). With increasing water content, the hydrolysis of Cs 4 PbBr 6 NCs is promoted to yield more CsPbBr 3 NCs, which was used to determine trace water in n -hexane, dichloromethane, and toluene with detection limits of 0.031, 0.043, and 0.057 μL mL −1 , respectively. The device offers the advantages of portability and low cost for rapid field determination of trace water in hydrophobic organic solvents.
Graphical abstract
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 14
·4424-4431
·
IF 6.1
Jiaqi Zhao,Yuan Wang,Tinglei Wang,Yu Wang
Chiral defect-induced strategy is employed to synthesize zero-dimensional (0D) chiral Cs4PbBr6 perovskite nanocrystals (NCs) with blue photoluminescence via a phase transition process. The chirality of the ground state of chiral Cs4PbBr6 perovskite NCs is confirmed by circular dichroism (CD) spectra, which shows the characteristic mirrored CD signals, behaving as a pair of enantiomers. Meanwhile, the obvious circularly polarized luminescence (CPL) response indicates that the chiral Cs4PbBr6 perovskite NCs are endowed with the chirality of the excited state. Furthermore, the UV–vis spectroscopy and electron paramagnetic resonance (EPR) data explicitly reveal that the CPL response originates from the chiral bromine vacancy (VBr). This work not only provides guidance to realize the CPL of 0D chiral perovskites but also gives insights into the structure–property relationship.
研究领域:
材料科学
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光学
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.6
Siyuan Fu,Hong Ming,Haorui Zhu,Kaiyu Huang,Hanqi Yao,Zhen Chen,Xiaofeng Liu,Huidan Zeng
Driven by the urgent need for narrow-band green emitters to address the color gamut deficiency in current white light-emitting diodes (WLEDs), in this work we develop a novel precursor-mediated strategy for the controlled synthesis of high-efficiency Cs 4 PbBr 6 perovskite crystals. Unlike conventional methods that often yield mixed phases, we utilize a judiciously designed organic-inorganic hybrid perovskite crystal, (HDA)Cs 2 Pb 3 Br 10 (HDA = 1,6-hexanediamine), as a self-sacrificing template for the synthsis of high purity Cs 4 PbBr 6 crystals. By precisely adjusting the solvent composition (HBr/DMF(N,N-Dimethylformamide) ratio) during the dissolution-recrystallization process, selective and controllable phase conversion of the hybrid perovskite to Cs 4 PbBr 6 or CsPbBr 3 was achieved. Specifically, the resulting high-quality Cs 4 PbBr 6 crystals exhibit a high photoluminescence quantum yield (PLQY) of up to 94 %. The phase transition mechanism systematically investigated through combined spectroscopic methods unravels that the transformation into all-inorganic perovskites benefits from the stripping of the HDA 2+ organic interlayer by the DMF solvent, while the formation of high-quality Cs 4 PbBr 6 crystals is attributed to the Pb-deficient environment provided by HBr and DMABr (Dimethylammonium bromide). Furthermore, a prototype WLED device fabricated with the obtained Cs 4 PbBr 6 crystals and commercial K 2 SiF 6 :Mn 4+ phosphor demonstrated a high luminous efficiency of 98.04 lm/W and an extensive color gamut covering 136 % of National Television System Committee (NTSC) and 101.6 % of Rec.2020 (derived from the photoluminescence spectra after passing RGB optical filters). These results highlight the potential of the Cs 4 PbBr 6 crystals for application in advanced wide-color-gamut displays.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jie Zhang,Aifei Wang,Lingbin Kong,Lei Zhang,Zhengtao Deng
Cesium lead halide perovskites have been arise as a new promising materials for optoelectronic applications . On this basis, zero-dimensional inorganic perovskites, Cs 4 PbBr 6 can be an important candidate because of the excellent stability. However, obtaining the high photoluminescence quantum yield (PLQY) of phase-pure Cs 4 PbBr 6 Perovskites still remains a challenge. Here, we synthesized the phase-pure Cs 4 PbBr 6 crystals through a simple ligand-assisted, reprecipitation strategy under room-temperature. We altered the assisted ligands that used in the experiment synthesis, such as substitute dodecylamine for oleylamine, and obtained high near PLQY (95.1%) of phase-pure Cs 4 PbBr 6 Perovskites. We revealed the extra oleic acid (OA), such as the ratio of OA and dodecylamine for 10 : 1 , would improve their PLQY. Most importantly, we demonstrated the short lifetime decay is caused by the recombination of trapped exciton inside the crystal but the long lifetime decay is attributed to the recombination of the surface energy states, and provided a great comprehension in photophysical of Cs 4 PbBr 6 Perovskite materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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