ORGANIC ELECTRONICS
·
2024
·
IF 2.7
Cangyu Wang,Xiaoge Song,Sinyeong Jung,Wansi Li,Maggie Ng,Season Si Chen,Man-Chung Tang
Recent research on anthracene-based hydrocarbon (PNA) as the emissive layer host found that deuteration mediated the formation of these adduct species, presumably quenchers, and thus improved the device lifetime. Meanwhile, studies on deuterium in PNA host materials with stepwise deuteration are scarce. In this work, we report a systematic study of isotopic effects through independent deuteration of the phenyl or/and the dibenzofuran unit on a series of PNA materials polyaromatic dibenzofuran ( PAF , PAF- d 5 , PAF- d 7 and PAF- d 12 ). We fabricated fluorescent OLED based on this triplet-triplet up-conversion active host materials for conventional MR-TADF emitter. A short-lived excited delayed lifetime of less than 2 μs has been observed in their electroluminescence decay studies. In addition, LT 80 of up to 12.7 h has been observed in PAF- d 12 at the brightness of 1000 cd m −2 , corresponding to a 4-fold enhancement of OLED stability compared to the non-deuterated counterpart. We hope the current research can provide insights for further device improvement.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Songsong Liu,Yulin Ma,Jiajun Wang,Pengjian Zuo,Chunyu Du,Geping Yin,Yunzhi Gao
Uniform lithium (Li) deposition and stable interface between anode and electrolyte are crucial factors for realizing the practical application of Li metal anode. Herein, a homogeneous lithium fluoride (LiF) protective layer with many nano slits is constructed on the Li anode by a facile vacuum evaporation method. It can uniformize the Li ion flux at surface of anode via its homogeneity and suppress the violent side reaction between Li and electrolyte via its good compactness. The existence of nano-slits allows the penetration of electrolyte and thus providing sufficient lithium ions transmission channels. Therefore, such a homogeneous LiF layer effectively inhibits the growth of Li dendrites and alleviates the consumption of active Li metal, significantly improving the stability of Li anode during long-term cycles. With the LiF-protected Li anode, the full cell with LiFePO 4 cathode delivers 2.5 times longer lifespan and slower capacity attenuation than control cells. This work highlights significant roles of homogeneous protective layer in stabilizing Li anode and supplies new insights in the design of anode interphase for rechargeable lithium metal batteries (LMBs).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2018
·Vol. 20
·期 15
·3557-3565
·
IF 8.586
Junjie He,Shixing Yang,Kai Zheng,Youming Zhang,Jun Song,Junle Qu
The lighting market has been dominated by light emitting diodes (LEDs), which not only need Ga for wafer production, but also consume abundant non-sustainable rare-earth elements such as Y, Ce and Eu. Hybrid-LED technology using organic downconversion materials (ODMs) is a promising candidate technology to save the rare-earth elemental resources. However, it is still a challenge to fabricate hybrid-LED devices with a high color rendering index (CRI), lumen efficiency and long lifetime at the same time. Herein, highly dispersible perylene diimides are synthesized in short routes and dispersed into a polymer matrix at high temperature to produce low cost light ODMs. Cold to warm white LED lamps with a CRI up to 92 can be fabricated with the ODMs. In particular, a warm white lamp with the same high CRI and efficiency up to 82 lm W−1 is obtained. It is comparable to all inorganic warm white LEDs with such a high CRI. By applying our OMDs, an approach for highly efficient yellow LED lamps, which can improve efficiency by 66% to 153 lm W−1 compared with the present method, is illustrated. More importantly, incorporating a remote phosphor configuration (RPC) effectively improves the lifetime of ODMs superior to 2870 h, extrapolated to 6000 h maintaining 70% of the original fluorescence efficiency after continuous operation in an ambient environment. This approach could be a quite simple protocol paving the way for the practical application of hybrid-LED lamps.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Materials
·
2025
·Vol. 5
·期 7
·N
·
IF 11.2
Feiyang Hu,Zhiwen Cui,Zhen Dong,Liyuan Jiang,Nwaji Njemuwa Njoku,Wenzhang Dong,Hao Fan,Mahalingam Ravivarma,Jianbao Wu,Duanyang Kong,Jiangxuan Song
Aqueous Zn-based flow batteries often face issues such as poor reversibility and short lifespan due to irregular Zn deposition and detrimental side reactions. To address these challenges, we developed a zwitterionic gemini additive, N,N′-bis(3-propanesulfonic acid)-3,3′-bipyridinium (SPr-Bpy), to enhance Zn plating/stripping behavior and optimize the Zn2+ solvation structure. The dual sulfonate groups influence the Zn2+ solvation shell and anchor SPr-Bpy to the Zn surface through multi-site interactions. Additionally, the bipyridinium structure forms an electrostatic shielding layer, suppressing excessive Zn2+ accumulation, promoting uniform Zn deposition, and thus mitigating dendrite formation and hydrogen evolution. Consequently, the Zn||Zn symmetric cells exhibit an impressive lifespan of 250 h, while the Zn||Cu asymmetric cells achieve a high average Coulombic efficiency of 99.8% over 450 cycles. Moreover, SPr-Bpy significantly improves Zn/TEMPO flow battery performance, achieving a high areal capacity of 24.4 mAh cm-2 with an exceptional capacity retention of 99.992%/cycle over 500 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Wenchen Ma,Zhenwei Ren,Hengfei Shi,Xueqing Xia,Xinwen Wang,Huifei Ji,Hua Chen,Chengzhao Luo,Chinhua Wang,Song Chen,Yu Chen
As an alternative electron transport material to the chemically unstable ZnO nanoparticles (NPs), SnO 2 NPs exhibit a great potential to construct high-performance quantum dot light-emitting diodes (QLEDs). However, only moderate device performance has been obtained for SnO 2 -based QLEDs due to the low electron mobility, unfavorable energy band, and massive defects of SnO 2 NPs. Herein, a strategy of transition metal doping is reported to achieve high-quality manganese-doped SnO 2 (Mn-SnO 2 ) NPs to address the above problems. Specifically, the large bond energy of Mn─O bonds reduces the oxygen vacancy defects, prompting an effective suppression of the interfacial exciton quenching for massive radiative recombination. Moreover, the favorable energy band and high electron mobility for Mn-SnO 2 promote efficient electron injection and transportation. The good optoelectronic properties for Mn-SnO 2 NPs contribute to a great enhancement in device efficiency from 8.2 to 11.4% and a remarkable improvement in lifetime ( T 95 ) from 565.3 to 1009.2 h at 1000 cd −2 , among the best performing ZnO-free QLEDs. Notably, the Mn-SnO 2 based QLEDs show a very superior shelf stability to the QLEDs based on SnO 2 and ZnO analogs. Consequently, this work reports an effective approach to achieve high-quality SnO 2 NPs for efficient and stable QLEDs.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Photonics
·
2025
·
IF 32.9
Jin Wangxiao,He Siyu,Lu Xiuyuan,Zhu Xitong,Liu Dijiong,Sun Guolong,Hao Yanlei,Chen Zuyan,Wang Chenyang,Zeng Jiejun,Zheng Zhi,Yan Xiaolin,Yan Yiran,Wu Longjia,Lin Xiongfeng,Hou Wenjun,Cao Weiran,Liu Chuan,Liang Xiaoci,Gao Yuan,Deng Yunzhou,Cao Kaisheng,Yang Yingguo,Gao Feng,Jin Yizheng
Solution-processed light-emitting diodes (LEDs) are appealing for their potential in the low-cost fabrication of large-area devices. However, the limited performance of solution-processed blue LEDs, particularly their short operation lifetime, is hindering their practical use in display technologies. Here we demonstrate that trace water in the device—previously considered detrimental to most solution-processed LEDs—dramatically enhances the performance of quantum-dot LEDs. This breakthrough stems from our comprehensive mechanism investigations into the positive aging phenomenon, a long-standing puzzle in the quantum-dot LED field. Our findings reveal that water passivation on the surface of electron-transporting layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination by suppressing hole leakage during device operation. Combined with the advanced top-emitting architecture, our blue quantum-dot LEDs achieve a high current efficiency of 37.1 cd A −1 , a blue index (colour-coordinate-corrected current efficiency) of over 490 cd A −1 \({{\rm{CIE}}}_{y}^{-1}\) and unprecedented stability, with an extrapolated T 95 lifetime (at an initial brightness of 1,000 cd m −2 ) of 287 h. Our work may inspire further exploration into surface passivation of nanocrystalline functional layers, critical for the advancement of emerging solution-processed optoelectronic and electronic devices.
研究领域:
光电子学
·
纳米技术
·
材料科学
·
半导体器件
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xueling Wu,Yue Mi,Run Jiao,Jiahao Chen,Xuling Jin,Kongyao Chen,Yanjie Wang,Jianxin He
Zinc-based energy storage devices are among the most promising candidates for large-scale energy storage owing to their inherent safety and the abundance of raw materials. However, the “tip effect” of zinc metal promotes dendrite growth, significantly limiting the cycle life of zinc-based devices. This study utilizes mullite nanofiber membranes (possessing excellent mechanical strength and high-temperature resistance) as a Zn²⁺-regulating interface layer to achieve uniform Zn²⁺ flux distribution and controlled zinc deposition. Consequently, the cycling stability of both zinc anodes and zinc-based devices is significantly enhanced. Using air-jet spinning followed by high-temperature annealing, this study fabricates a flexible and foldable mullite membrane containing aluminum and silicon, with a uniform pore structure and excellent high-temperature resistance. At a current density of 5 mA cm⁻² and stripping capacity of 1 mAh cm⁻², the Zn//Zn symmetric cell incorporating the mullite membrane achieves a cycle life exceeding 1600 h. The Zn//Mul–GF//AC capacitor demonstrates stable cycling over 20,000 cycles with an average Coulombic efficiency of 99.95 %. This enhanced performance is primarily attributed to the unique structural advantages of the mullite membrane: (1) in conjunction with a glass fiber separator, it forms a gradient-distributed pore architecture that exerts a dielectric shielding effect, facilitating uniform Zn²⁺ flux distribution for homogeneous zinc deposition, and (2) its excellent mechanical integrity suppresses dendrite formation and interfacial side reactions. Furthermore, the soft-pack zinc-ion capacitor incorporating the mullite membrane exhibits excellent electrochemical performance under high-temperature (55°C) and bending conditions, owing to its flexibility and thermal resistance.
研究领域:
储能材料
·
纳米技术
·
电化学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）