CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yunhui Kuang,Yazhuo Xue,Zheng Zhang,Lvpeng Yang,Tong Bie,Rui Li,Wenxi Liang,Naigen Zhou,Ming Shao
Efficient and stable pure-red perovskite light-emitting diodes (PeLEDs) show great potential for high-definition displays. Despite significant advancements in device performance over recent years, achieving both high external quantum efficiency (EQE) and long-term stability remains a significant challenge. In this study, we employed 5-amino valeric acid (5-AVA) as a crystallization agent and utilized in situ analytical techniques, including X-ray diffraction, UV–visible spectroscopy, and photoluminescence, to explore its role in the crystallization kinetics of quasi-2D perovskite (POEA 0.7 NMA 0.3 ) 2 CsPb 2 I 7 films. Our results reveal that the strong coordination capability of 5-AVA with Pb 2+ ions promotes direct nucleation of perovskite phases and slows down crystal growth following a “rapid nucleation, slow growth” mechanism. This well-controlled crystallization kinetics leads to enhanced crystallinity, reduced defect density, and a narrower cascade phase distribution for quasi-2D perovskites. Ultimately, these improvements enable pure-red PeLEDs to achieve higher EQEs, increasing from 15.68 % to 21.23 %, and extending the operational lifetime, from 242 min to 506 min. Our research highlights the potential of precisely regulating crystallization kinetics to address the key challenges of phase impurity and non-radiative energy losses in quasi-2D PeLEDs, paving the way toward reliable and efficient PeLEDs.
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Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-10
·
IF 23.4
Gu Simin,Lian Huiwang,Kuang Rongyi,Lou Bibo,Ma Chonggeng,Liu Gaochao,Wang Jing
Laser-driven near-infrared II (NIR-II) light sources comprising luminescent ceramics represent a promising research frontier, yet their development remains constrained by the external quantum efficiency (EQE) and thermal stability bottleneck of current luminescent materials. Herein, we present a non-equivalent cation substitution strategy to fabricate high-efficiency translucent MgO:Ni 2+ , Cr 3+ NIR-II luminescent ceramics. The co-doping of Cr 3+ induces structural distortion at Ni 2+ -occupied octahedral sites, effectively breaking the parity-forbidden d-d transition constraint while enabling efficient energy transfer from Cr 3+ to Ni 2+ . These synergistic effects yield remarkable internal and external quantum efficiencies of 61.06% and 39.69%, respectively. The developed ceramic demonstrates exceptional thermal management capabilities with 31.28 W·m −1 ·K −1 thermal conductivity and 92.11% emission retention at 478 K. When integrated into laser-driven NIR-II light sources, the system achieves record-breaking performance of 214 mW output power under 21.43 W/mm 2 blue laser excitation. Practical demonstrations showcase superior non-destructive imaging capabilities with 5.29 lp/mm spatial resolution and 0.97 contrast ratio. This work establishes a new paradigm for developing high-performance NIR-II light sources in advanced imaging and detection technologies.
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ACS Energy Letters
·
2021
·
IF 23.101
Lvpeng Yang,Yun Zhang,Junming Ma,Ping Chen,Yu Yu,Ming Shao
Efficient and spectrally stable pure-red perovskite light-emitting diodes (PeLEDs) are still rare and urgently needed for high-definition display. The traditional color tuning method by varying halide composition undergoes phase segregation and has spectral instability issues. Instead of halide mixing, we fabricate pure-red PeLEDs based on quasi-two-dimensional (quasi-2D) perovskites by simultaneously incorporating phenethylammonium (PEA) and 1-naphthylmethylammonium (NMA) cations. The control of PEA and NMA cospacer ratio modulates the phase distribution and the resulting different color emission. The PeLEDs with PEA:NMA molar ratio of 5:5 exhibit a pure-red (635 nm) electroluminescence (EL) with a CIE coordinate (0.709, 0.285) approaching the Rec. 2020 specification. Meanwhile, the optimized devices exhibit an external quantum efficiency (EQE) of 12.41% and a maximum brightness of 1452.6 cd m–2, which are among the best-performing pure-red PeLEDs based on quasi-2D perovskite to date. Additionally, our PeLEDs demonstrate stable EL spectra under different operating voltages and continuous operation.
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InfoMat
·
2024
·Vol. 6
·期 7
·e12547
·
IF 22.7
Haisheng Chen,Jiaying Shen,Xiaona Du,Songhua Cai,Feng Guo,Weng Fu Io,Tianhong Zhou,Zhengang Dong,Taiyu Bian,Jiaxing Guo,Weiwei Liu,Yang Zhang,Zhenping Wu,Jianhua Hao
Modulation of light underpins a central part of modern optoelectronics. Conventional optical modulators based on refractive-index and absorption variation in the presence of an electric field serve as the workhorse for diverse photonic technologies. However, these approaches based on electro-refraction or electro-absorption effect impose limitations on frequency converting and signal amplification. Lanthanide-activated phosphors offer a promising platform for nonlinear frequency conversion with an abundant spectrum. Here, we propose a novel approach to achieve frequency conversion and digital modulation of light signal by coupling lanthanide luminescence with an electrically responsive ferroelectric host. The technological benefits of such paradigm-shifting solution are highlighted by demonstrating a quasi-continuous and enhancement of the lanthanide luminescence. The ability to locally manipulate light emission can convert digital information signals into visible waveforms, and visualize electrical logic and arithmetic operations. The proof-of-concept device exhibits perspectives for developing light-compatible logic functions. These results pave the way to design more controllable lanthanide photonics with desired opto-electronic coupling.
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InfoMat
·
2025
·
IF 22.3
Gaochao Liu,Zhan Xiong,Weibin Chen,Shuai Zhang,Yuzhen Wang,Zhiguo Xia
High-power broadband near-infrared (NIR) light sources have attracted extensive interest toward emerging non-invasive imaging and detection applications. However, exploring highly stable luminescent materials with targeted broadband NIR emission remains a great challenge. Here, MgAl 2 O 4 :Cr 3+ translucent ceramics have been designed and fabricated by a spark plasma sintering method, and a giant redshift of the emission band occurs from 686 to 928 nm due to the decreasing local structural symmetry around the isolated Cr 3+ ions induced by the abundant cation vacancies. As Cr 3+ content increases, MgAl 2 O 4 :6%Cr 3+ ceramic realizes the optimized external quantum efficiency of 73% with broadband NIR emission centered at 890 nm and a full-width at half-maximum of 315 nm under 450 nm excitation. The next-generation laser-driven light source containing NIR ceramic provides an output power exceeding 2 W and a light conversion efficiency of 22% when pumped with a blue laser of 10 W·mm −2 . The proof-of-concept demonstrations in imaging and detection reveal the advantages of high-power and high-efficiency laser-driven broadband NIR light sources and promote future development in the chemical design of NIR emitters.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jiaming Zhang,Yao Xu,Haifeng Wang,Meng Liu,Ke Shi,Zihao Zhang,Boyang Zhang,Kaiwei Liu,Jifang Zhang,Guijun Ma
To achieve a high efficiency in solar powered photocatalytic water splitting, the inorganic semiconducting photocatalysts are supposed to have i) a narrow bandgap for harvesting solar light sufficiently, ii) an intrinsic built-in electric field to enable efficient electron-hole separation, and iii) precise surface modifications to accelerate redox reactions. Y 2 Ti 2 O 5 S 2 (YTOS), a cost-effective oxysulfide photocatalyst, is believed to be a promising candidate by meeting all these requirements. However, the existing studies on YTOS overlook the synergistic interaction between facets exposure, built-in electric fields, and interfacial reaction kinetics, hindering the rational design of highly efficient photocatalysts. Herein, we present a flux-mediated morphology control to synchronize oxidation reactions on hole-rich {001} facets and reduction reactions on electron-rich {101} facets within individual YTOS particles. In-situ cocatalysts modification of the facets further enhances the built-in electric field intensity while promoting surface redox kinetics. These comprehensive operations significantly improve both the activity and stability of YTOS, achieving a record apparent quantum yield of 60 % among oxysulfide photocatalysts. Such a value grants the YTOS particle a qualified photocatalyst to approach the targeted solar-to-hydrogen conversion efficiency of 10 % that is required for practical implementation of solar-powered water splitting. This work not only demonstrates the great potential of oxysulfide photocatalysts for water splitting but also provides a top-level design strategy by engineering charge migration and transition kinetics.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Maowei Jiang,Long Li,Zhiwen Qi,Feijiu Wang
Perovskite light-emitting diodes (PeLEDs) compliant with Rec. 2020 standards have raised increasing attention for next-generation displays. As a class of pure-green emitters, the mixed-cation FA x Cs 1-x PbBr 3 perovskites exhibit compatible band emission, but suffer from inferior luminescence performance. The approach to tackling this issue is hindered by a lack of in-depth understanding of their crystallization manipulating mechanism. This work unveils the crystallization process of mixed-cation FA 0.7 Cs 0.45 GA 0.1 PbBr 3 perovskites, demonstrating the fast spontaneous growth readily induces severe crystal defects accompanied by poor charge confinement. This motivates us to introduce additional kinetic barriers to manipulate the perovskite crystallization via the synergistic co-additives of 3-((2-(methacryloyloxy)ethyldimethyl)ammonio)-propane-1-sulfonate (DMAPS) and 1,4,7,10,13,16-hexaoxacyclooctadecane (crown). The multifunctional groups in the co-additives afford robust chemical affinities with the diverse organic and inorganic precursor ions simultaneously, which enable decent nanograin growth with effective crystal defect healing and charge confinement. Ultimately, mixed-cation FA 0.7 Cs 0.45 GA 0.1 PbBr 3 perovskites with a high photoluminescence quantum yield of 96% are achieved. The resultant pure-green PeLEDs with the Rec. 2020 compliance exhibit a champion external quantum efficiency (EQE) of 31.89%, average EQE of 29.5%, maximum luminance of 2 × 10 5 cd m −2 and operational half-lifetime of 3.2 h at an initial luminance of 7000 cd m −2 (extrapolated: ≈3500 h at 100 cd m −2 ).
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Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-10
·
IF 20.257
Yu Peng,Cao Sheng,Shan Yuliang,Bi Yuhe,Hu Yaqi,Zeng Ruosheng,Zou Bingsuo,Wang Yunjun,Zhao Jialong
InP-based quantum dot light-emitting diodes (QLEDs), as less toxic than Cd-free and Pb-free optoelectronic devices, have become the most promising benign alternatives for the next generation lighting and display. However, the development of green-emitting InP-based QLEDs still remains a great challenge to the environmental preparation of InP quantum dots (QDs) and superior device performance. Herein, we reported the highly efficient green-emitting InP-based QLEDs regulated by the inner alloyed shell components. Based on the environmental phosphorus tris(dimethylamino)phosphine ((DMA) 3 P), we obtained highly efficient InP-based QDs with the narrowest full width at half maximum (~35 nm) and highest quantum yield (~97%) by inserting the gradient inner shell layer ZnSe x S 1−x without further post-treatment. More importantly, we concretely discussed the effect and physical mechanism of ZnSe x S 1– x layer on the performance of QDs and QLEDs through the characterization of structure, luminescence, femtosecond transient absorption, and ultraviolet photoelectron spectroscopy. We demonstrated that the insert inner alloyed shell ZnSe x S 1− x provided bifunctionality, which diminished the interface defects upon balancing the lattice mismatch and tailored the energy levels of InP-based QDs which could promote the balanced carrier injection. The resulting QLEDs applying the InP/ZnSe 0.7 S 0.3 /ZnS QDs as an emitter layer exhibited a maximum external quantum efficiency of 15.2% with the electroluminescence peak of 532 nm, which was almost the highest record of InP-based pure green-emitting QLEDs. These results demonstrated the applicability and processability of inner shell component engineering in the preparation of high-quality InP-based QLEDs.
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Nano Energy
·
2022
·
IF 19.069
Ting Xiang,Ting Li,Miaosheng Wang,Wei Zhang,Mahshid Ahmadi,Xiaoyan Wu,Tianfei Xu,Meiqin Xiao,Long Xu,Ping Chen
It is always difficult to control the growth of crystals during the formation of multiple quantum wells (MQWs) in the quasi-2D perovskite light emitting diodes (PeLEDs). In this study, we introduce the 1, 4, 7, 10-tetraoxacyclododecane ether into the quasi-2D perovskite of PEA 2 Cs n-1 Pb n Br 3n+1 to reduce the coordination rate between the phenethylamine bromide and the perovskite framework. As a result, Crown-ether assisted in-situ grown (CAIG) perovskite crystals (PCs) is grown with thick PbBr 4 layers (n > 55) during the spin-coating. For the CAIG PCs, the generation of small n phases (n = 1, 2 and 3) are significantly suppressed, resulting in almost flat energy structure with the phases of n ≥ 4. The generation rate of the excited states of the n ≥ 4 remains ultra-fast within ~0.77 ps even without the MQWs structures; however the decay of excited states becomes much slower. The CAIG PCs film has lower trap density , therefore promoting the carrier mobility , carrier diffusion length and the photoluminescence quantum yield . The PeLEDs based on the CAIG PCs film achieves the maximum luminescence of ~27562 cd m −2 and the maximum external quantum efficiency (EQE) of ~16.1%. The half-lifetime of the luminescence and the EQE measured in the atmosphere (a relative humidity of ~52% at 27 ℃) are exceeding ~17 and 43 h, respectively. Hence, it can be recognized as the most ambient stable device based on the PEA 2 Cs n-1 Pb n Br 3n+1 perovskite.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Zhaomiao Chu,Chengzhu Yu,Chuang Li
Dynamic phase transitions are important in living organisms for sustaining their adaptive structures and functions. The design of artificial dynamic systems using light as a noninvasive input fuel has gained significant interest to mimic such adaptive features. Here the development of light-fueled dissipative phase transitions of upper critical solution temperature polymers by introducing pendant spiropyrans as photoactive units, is reported. The reversible open-close photoisomerization of spiropyrans is designed to undergo either an enhancement or a decline of their net charge, which is subsequently used to regulate the electrostatic interactions between polymer chains, and ultimately shift their phase transition temperatures to either a lower or a higher direction. The degree and speed of such bidirectional shifting are flexibly modulated by manipulating the external illumination parameters or varying the compositions/concentrations of the polymers. The diametrically opposite transmittance changes driven by light are utilized to produce a series of complementary patterns and shapes for application in transient information storage and encryption with improved accuracy and security. This work offers a bidirectional spatiotemporal modulation of dissipative phase transitions of polymers using visible light that allows highly tunable and adaptable features shared with their natural counterparts.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 20
·8721-8735
·
IF 3.5
Wang Yifan,Wang Lele,Li Qi,Wu Jianning,Meng Guihua,Yang Shengchao,Liu Zhiyong,Tai Yanlong,Liu Jichang
Photocatalytic overall water splitting (POWS) is a promising route for converting solar energy into green and sustainable energy. Herein, we report a facile hydrothermal approach to fabricate polyhedron BiVO 4 by Mo and Yco-doping (MYB) photocatalysts with suitable band gap for POWS. The MYB exhibited enhanced visible light-driven POWS activities in comparison with that of as-prepared BiVO 4 , Y-BiVO 4 and M-BiVO 4 , with the maximum H 2 and O 2 evolution rate of 34.7 and 17.4 μmol·h −1 ·g −1 , respectively. The optimum activity of the catalyst was controlled by adjusting Mo content of MYB. The photodeposition of Pt shows that there are special separation reduction and oxidation centers on the surface of MYB. Electrochemical experiments further confirmed the enhanced charge separation of MYB. MYB photocatalyst has small particle size, unique polyhedral structure, large specific surface area and high (103) and (200) surface exposure, thus improving POWS performance, high electron transfer efficiency and effective separation of photogenerated electron–hole pairs. Because of the doping of Mo and Y elements, the electronic structure of the catalyst is altered, enhancing light absorption and reducing the recombination of photogenerated electron–hole pair. The current study revealed that the MYB products could serve as cost-effective and stable photocatalysts for POWS. Graphical Abstract
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dan Xiao,Xue-Min Yang,Jin-Xiang Lv,Meng-Ting Zheng,Qian-Ting Wang,Kathrin Harre
Aiming to endow natural minerals with fast, high-sensitivity, and controllable smart light, humidity, solvent and temperature responsiveness, a novel ceramic clay and cucurbituril (CB) guest-host system (MVCB) inspired by nature was self-assembled and rearranged via an ingenious and simple design successfully. For the first time, the multi-functional MVCB not only displayed a high intelligent multi-stimuli responsiveness as light, humidity, solvent, and temperature switches, but also had multiple selective molecular recognition responses because of different organic vapor with CB and asymmetrical bilayer clay. For instance, due to the factors of guest-host and slow release, the average response speed of self-assembled shuffling the MVCB in methanol was as high as 108°/s compared with bilayer film without CB (20°/s). Besides, the MVCB exhibited controllable swift movement and was bending for grabbing three times its own weight. Moreover, the ultra-wide operating temperature of the MVCB from was ranging −196 to 300 °C under extreme condition. More interestingly, the MVCB presented a unique and compliable self-driven, smart switch, shape memory, environmental awareness and soft robotic gripper owing to the asymmetrical swelling and supramolecular of the CB. This work not only brings a simple, cost-effective, large-scale, and efficient strategy for multi-functionalized natural minerals materials, but also opens potential applications for intelligent response, extremely resistant substances, energy conversion and soft robotics.
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