APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhuoqi Wen,Zhongjie Cui,Dan Yang,Haiyang He,Shuaitao Qin,Sinong Wang,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Two-dimensional (2D) lead halide perovskite with attractive properties is considered one of the most promising candidates for preparing blue-emitting materials and corresponding optoelectronic devices. For the formamidinium-based (FA) nanoplatelets (NPLs), despite exhibiting better optical performance compared to their counterparts, it is still challenging to precisely control their emission in the blue region during synthesis and the influence of chloroform on the components of FAPbBr 3 have not been investigated thoroughly. Herein, it is revealed that the decomposition of chloroform during the synthesis will introduce Cl into the crystal with the assistance of surface ligands, leading to the mixed-halide perovskite. Further, an A-site cation strategy was introduced for tuning the spectra of FAPbBr 3 NPLs. The addition of Cs with a small ionic radius can shrink the arrangement of octahedrons and enhance their interactions, which will promote the seeding growth of perovskite and form uniform crystals. With help of surface ligands, these uniform crystals will further grow to form homogeneous perovskite NPLs. The obtained NPLs show the pure emission from sky-blue to deep-blue. To the best of our knowledge, it is the first report about finely tuning the emission of FAPbBr 3 in the blue region. This crystallization control strategy by introducing Cs is beneficial for their further applications in the field of photoelectric devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qiaopeng Cui,Dingshuo Zhang,Yun Gao,Chao Fan,Qiuting Cai,Hongjin Li,Xiaohui Wu,Meiyi Zhu,Junjie Si,Xingliang Dai,Haiping He,Zhizhen Ye
Controlling interfacial reactions is critical for zinc oxide (ZnO)-based inverted perovskite light-emitting diodes (PeLEDs), boosting the external quantum efficiency (EQE) of the near-infrared device to above 20%. However, violent interfacial reactions between the bromine-based perovskites and ZnO-based films severely limit the performance of inverted green PeLEDs, whose efficiency and stability lag far behind those of their near-infrared counterparts. Here, a controllable interfacial amidation between the bromine-based perovskites and magnesium-doped ZnO (ZnMgO) film utilizing caprylyl sulfobetaine (SFB) is realized. The SFB molecules strongly interact with formamidinium bromide, decelerating the amidation reaction between formamidinium and carboxylate groups on the ZnMgO film, thus regulating the crystallization of FAPbBr3. Combined with the passivation of benzylamine, a FAPbBr3 bulk film directly deposited on a ZnMgO substrate with single-crystal characteristics is obtained, exhibiting a high photoluminescence quantum yield of above 80%. The resultant PeLEDs demonstrate a peak EQE of exceeding 20% at a high luminance of 120,000 cd m–2 and a half lifetime of 26 min at 11,000 cd m–2, representing the state-of-the-art inverted green electroluminescence. This work resolves the crucial issues of violent interfacial reactions and provides a strategy toward inverted green PeLEDs with outstanding performance.
研究领域:
材料科学
·
光电学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 46
·17512-17520
·
IF 8.067
Jizhong Liu,Hui Fu,Zhentao Du,Deliu Ou,Shixian Li,Qiaochu Chen,Weiyou Yang,Jialong Zhao,Jinju Zheng
The photothermal stability against light irradiation and high temperature of organic–inorganic hybrid perovskite nanocrystals (PNCs) is critically important for their applications in photoelectronic nanodevices. In the present work, we report the significantly enhanced photothermal stability of FAPbBr3 PNCs, which are fabricated by in situ growth of PNCs in polyvinylidene fluoride films (FAPbBr3@PVDF) with incorporation of Cd2+ ions. It is found that the introduced Cd2+ ions could effectively passivate the PNC defects and shorten the length of Pb–Br bonds, giving rise to the intensified interaction between Pb2+ and Br− in the [PbBr6]4− octahedron, which thereby suppresses the halogen ion migration under light irradiation and high temperature with enhanced photothermal stability. As a result, the Cd2+-doped FAPbBr3@PVDF film exhibits durable photothermal stability with 96% and 97% photoluminescence quantum yield (PLQY) retentions, under continuous blue-light irradiation (460 nm, 13 mW cm−2) for over 360 h, and under both a high temperature of 333 K and blue-light irradiation over 48 h, respectively. Furthermore, the as-constructed white light-emitting-diodes (WLEDs) deliver a wide color gamut (117% of NTSC standard) with chromaticity coordinates of (0.331, 0.337), verifying their promising applications in backlight sources.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
DOI
高影响因子
Solar RRL
·
2025
·
IF 4.7
M. Zubair Nisar,Xingtian Yin,Shoaib Iqbal,Wenxiu Que
Perovskite solar cells (PSCs) are considered highly promising for next-generation building-integrated photovoltaic (BIPV) applications due to their abundant raw materials, tunable transparency, and cost-efficient fabrication through printable processes. Herein, a dual-architecture strategy for formamidinium lead bromide (FAPbBr 3 ) perovskite solar cells is established. We achieved a record 8.77% power conversion efficiency (PCE) with 1.39 V open-circuit voltage ( V OC ) in carbon-based electrode devices and 3.25% PCE with 35.03% average visible transmittance (AVT) in semitransparent configurations. Through systematic optimization of annealing temperature (60–100°C) and duration (10–40 min), we identify 80°C/20 min as the ideal condition, yielding large grains with complete surface coverage, enhanced photoluminescence intensity indicating suppressed nonradiative recombination and optimal phase purity. The carbon-based electrode device (ITO/SnO 2 /FAPbBr 3 /C) achieves exceptional performance ( J sc = 9.35 mAcm −2 , FF = 67.4%), while the identical perovskite layer transferred to a Spiro-OMeTAD/MoO 3 /Ag/MoO 3 stack attains functional semitransparency (CIE (0.49,0.44)). These findings pave the way for the development of esthetically integrated and energy-efficient building-integrated solar solutions, with a clear path toward further optimization and commercialization of perovskite-based BIPV systems.
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
薄膜太阳能电池
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 19
·3214-3222
·
IF 6
Jiaqi Liu,Feng Zhang,Cuihe Fan,Zhengwei Cao,Yuying Hao
Perovskite quantum dots (QDs), with outstanding properties, including tunable emissions, high color purity, and low cost solution processability, have become promising candidates in light-emitting applications. However, the inherent instability issue strongly restricts further development and commercialization of light-emitting devices based on perovskite QDs. As well investigated in conventional QDs, the construction of QDs with core–shell structure is recognized as an effective way to improve the stability and optimize luminescent properties at the same time. Inspired by the unique structure diversity of perovskite materials, 2D/3D FAPbBr3@GA2PbBr4 QDs are proposed and fabricated through a one-step phase transfer enhanced emulsion synthesis. By systematically tuning the ratio between GABr and FABr as well as a combined analysis with X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, absorption and photoluminescence spectrum characterizations, a well-defined core–shell structure is demonstrated for FAPbBr3@GA2PbBr4 QDs under an appropriate ratio of GABr/FABr. Compared to the original QDs, the as fabricated core–shell QDs exhibit an enhanced exciton binding energy and improved stability under heat, light, and moisture exposure. Moreover, phosphor converted light-emitting diodes based on the core–shell QDs are also fabricated with a much improved device performance than that of QDs without a core–shell structure, proving the superiority of FAPbBr3@GA2PbBr4 QDs in light-emitting applications.
研究领域:
材料科学
·
纳米技术
·
光学工程
·
化学合成
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yicheng Zeng,Weiwei Chen,Yuan Deng,Wanying Gu,Chenxi Wu,Yating Guo,Pan Huang,Fangze Liu,Hongbo Li
Formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) have been demonstrated to exhibit ideal ultrapure green luminescence at 530 nm and to hold great potential in light-emitting diodes, by potentially overcoming the difficulties facing cesium lead bromide (CsPbBr3) NCs. However, compared to all-inorganic lead halide perovskite NCs, organic–inorganic hybrid FAPbBr3 NCs are sensitive to moisture, oxygen, and heat due to their intrinsic instability caused by the organic cations (FA+). Herein, we present an epitaxial growth method for the overgrowth of a large-band-gap cesium lead halide (Cs4PbBr6) shell on the surface of FAPbBr3 NCs. The resulting core/shell NCs show a near-unity photoluminescence quantum yield (PLQY) of 97.1%, the emission with full width at half-maxima of 88 meV, and long-term environmental stability. The introduction of Cs+ into FAPbBr3 NCs can inhibit the migration of FA+ and suppress the phase transformation from cubic phase to tetragonal phase at 60 °C. Furthermore, the existence of shell can provide stronger exciton confinement and improve the thermal stability of FAPbBr3 NCs. The core/shell perovskite NCs developed in this study have the advantages of high PLQY and good stability and may contribute to the field of light-emitting diodes (LEDs).
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2025
·
IF 9.1
Yaning Luo,Sheng Wang,Wenqiang Li,Xu Cao,Chengxi Zhang,Jun Dai,Lin Wang,Xuyong Yang
Metal halide perovskite nanocrystals (PeNCs) have emerged as promising materials for next-generation light-emitting diodes (PeLEDs) due to their outstanding optical properties. However, synthesis challenges such as rapid crystallization often introduce defects that degrade device performance. Herein, a dual-ligand approach employing trioctylphosphine oxide (TOPO) and phenylphosphinic acid (PPIA) is introduced to coordinate Pb 2 ⁺ ions, effectively slowing the crystallization process and minimizing defect formation. The obtained PeNCs exhibit a high photoluminescence quantum yield (PL QY) of 93%. Additionally, the PPIA ligand enhances electrical conductivity via π-electron resonance, enabling more efficient charge transport in FAPbBr 3 films. As a result, the optimized PeLEDs achieve a peak external quantum efficiency (EQE) of 24.2% and a luminance of 32 840 cd m − 2 , significantly outperforming the control devices, which exhibit an EQE of 12.1% and a luminance of 1577 cd m − 2 . Furthermore, the operational lifetime of the optimized PeLEDs is 5.3 times longer than that of the control devices. These findings offer a promising pathway for advancing the performance and stability of PeLEDs.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 64
·36910-36914
·
IF 2.936
Long Xu,Yan Meng,Caixia Xu,Ping Chen
Solution-processed organic–inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices. In this paper, formamidinium lead tribromide perovskite thin films composited with polyethylene oxide (PEO) were fabricated by a solution processing method. Great enhancement of photoluminescence was observed and more attractively, two-photon-pumped random lasing action could be achieved at room temperature when pumped by a nanosecond pulse laser with excitation wavelength centered at 1064 nm. Evident transition from spontaneous upconversion emission to random lasing action was investigated by monitoring the log–log light emission slope and peak width at half height. The lasing threshold is at around 1.1 mJ cm−2, which is comparable to that of other two-photon upconversion random lasers. The efficient random lasing emission originates from the multiple random scattering provided by the micrometer-scale rugged morphology and polycrystalline grain boundaries. Compared with conventional lasers that normally serve as a coherent light source, the perovskite random lasers show promise in fabricating low-cost thin-film lasing devices for flexible and speckle-free imaging applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 22
·7996-8003
·
IF 5.7
Cuihe Fan,Feng Zhang,Zhengwei Cao,Jiaqi Liu,Yuying Hao
Perovskite light-emitting diodes (PeLEDs) have attracted widespread interest owing to their tunable emissions, high color purity and cost effective fabrication processes. It is widely recognized that high quality perovskite nanocrystal (PeNC) films are crucial for obtaining efficient PeLEDs. However, due to the fast crystallization rate of perovskite precursors, it is a great challenge to achieve precise control of the size and dimension of the PeNC film using a single ligand additive. Here, two types of ligands with different effects, phenethylamine bromide (PEABr) and benzoic acid (BZA), are together introduced for fabrication of formamidine lead bromide (FAPbBr3) NC films. By systematically investigating the formation process of FAPbBr3 crystals using dual ligands, the regulation mechanism and the ligand synergistic effect are revealed. Then, highly luminescent and uniform FAPbBr3 NC films with a well confined three dimensional structure are fabricated through finely tuning the ratio of PEABr and BZA. Efficient electroluminescent (EL) devices are further achieved based on these obtained high quality FAPbBr3 NC films with the maximum current efficiency of 39.0 cd A−1 and an external quantum efficiency of 9.5%. Besides, the ligand synergistic effect on improving the device performance is explained and clarified. Moreover, EL devices fabricated using FAPbBr3 NC films based on dual ligands exhibit a significantly prolonged operation lifetime and better adaptability for large scale displays, showing potential advantages for future LED applications.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Shaomin Peng,Zuoliang Wen,Taikang Ye,Xiangtian Xiao,Kaiyang Wang,Junmin Xia,Jiayun Sun,Tianqi Zhang,Guanding Mei,Haochen Liu,Bing Xu,Xiaojun Li,Rui Chen,Guichuan Xing,Kai Wang,Zikang Tang
Metal-halide perovskite-based green and red light-emitting diodes (LEDs) have witnessed a rapid development because of their facile synthesis and processability; however, the blue-band emission is constrained by their unstable chemical properties and poorly conducting emitting layers. Here, we show a trioctylphosphine oxide (TOPO)-mediated one-step approach to realize bright deep-blue luminescent FAPbBr3 nanoplatelets (NPLs) with enhanced stability and charge transport. The concentration of NPL surface ligands is shown to be progressively tuned via varying the amount of intermediate TOPO due to the acid–base equilibrium between protic acid and TOPO. By effectively optimizing the concentration of surface ligands, the structural integrity of NPL solids can be preserved in ambient air for a week, mainly because of the highly ordered and dense solid assembly and the reduced defects. The removal of excess organic ligands also enables the improvement of charge mobility by orders of magnitude. Ultimately, ultrapure deep-blue perovskite LEDs (439 nm) with a narrow emission width of 14 nm and a peak EQE of 0.14% are achieved at low driving voltage. Our finding expands the current understanding of surface ligand modulation in the development of pure bromide deep-blue perovskite optoelectronics.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hanwen Zhu,Min Cheng,Junchun Li,Supeng Yang,Xuyong Tao,Yongqiang Yu,Yang Jiang
It has been proved that perovskite quantum dots (QDs) have great potential in optoelectronic devices because of their excellent optical performance. However, low stability against water and oxygen environment hinders the commercial application of down-conversion display films on account of its highly ionic nature and low formation energy. Here, we demonstrate a convenient method to obtain a uniform, large-area water-oxygen-resistant quantum dot-polymer composite film via illuminating FAPbBr 3 QDs and methyl methacrylate (MMA) under white light emitting diode. We find that FAPbBr 3 QDs act as photo initiators, leading to the polymerization of organic monomers around the quantum dots. The obtained FAPbBr 3 QDs-polymer nanocomposites are independently dispersed coated with about 10 nm thick polymerized methyl methacrylate (PMMA). Due to the well protection of covered PMMA, the FAPbBr 3 QDs/PMMA nanocomposites show high tolerance to water and oxygen, and the increased PLQY and lifetime indicate the reduction of non-radiative recombination centers. Furthermore, the FAPbBr 3 QDs/PMMA nanocomposites are easy to produce large area films, and no agglomeration during films production by knife coating process. Then uniform, strong fluorescence, transparent and stable blue, green and red nanocomposite films can be prepared by optimizing the viscosity via controlling the reaction time. Finally, white LED was fabricated with a Lumen Efficiency of 80.4 m/W and Color Rendering Index of 90. Our work suggests that illuminated polymerization of perovskite quantum dots under white light emitting diode provides a simple and effective method to commercialization
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xin Liu,Meng Xu,Yingying Hao,Jinghua Fu,Fangbao Wang,Binbin Zhang,Stephanie Bennett,Paul Sellin,Wanqi Jie,Yadong Xu
Compared with the widely reported MAPbBr3 single crystals, formamidinium-based (FA-based) hybrid perovskites FAPbBr3 (FPB) with superior chemical and structure stability are expected to be more efficient and perform as more reliable radiation detectors at room temperature. Here, we employ an improved inverse temperature crystallization method to grow FPB bulk single crystals, where issues associated with the retrograde solubility behavior are resolved. A crystal growth phase diagram has been proposed, and accordingly, growth parameters are optimized to avoid the formation of NH4Pb2Br5 secondary phase. The resulting FPB crystals exhibit a high resistivity of 2.8 × 109 Ω·cm and high electron and hole mobility–lifetime products (μτ) of 8.0 × 10–4 and 1.1 × 10–3 cm2·V–1, respectively. Simultaneously, the electron and hole mobilities (μ) are evaluated to be 22.2 and 66.1 cm2·V–1·s–1, respectively, based on the time-of-flight technique. Furthermore, a Au/FPB SC/Au detector is constructed that demonstrates a resolvable gamma peak from 59.5 keV 241Am γ-rays at room temperature for the first time. An energy resolution of 40.1% is obtained at 30 V by collecting the hole signals. These results demonstrate the great potential of FAPbBr3 as a hybrid material for γ-ray spectroscopy and imaging.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）