ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shuang Yang,Yinan Lao,Wenjin Yu,Zhenyu Tang,Haoqing Guo,Ganghong Liu,Bo Qu,Lixin Xiao,Zhijian Chen
Tin-based perovskites comprise one of the preferred nontoxic alternatives to Pb-based perovskites due to their desirable optoelectronic properties. However, there remains a crucial stability problem due to the property of Sn2+ oxidation. In this study, we reported stable tin-based perovskite nanocrystals (NCs) using stannous acetate as the Sn2+ source because of its stronger Sn–O bonding. To prevent the oxidation of Sn2+, a thin layer of CsBr coverage was formed in situ; tin-based perovskite NCs, CsxSnBrx+2@CsBr (1 < x < 4), show a high photoluminescence quantum yield (PLQY) of 78.2% and high stability. The measured lifetime of PLQY decrease to half of the initial value is ∼1287 h under ambient conditions and ∼2200 h under a nitrogen atmosphere, respectively. Furthermore, the as-fabricated light-emitting diodes based on CsxSnBrx+2@CsBr NCs as the emitting layer exhibit a maximum luminescence of 16 cd/m2 and an external quantum efficiency of 0.035% with peaks at 451 and 615 nm, corresponding to the emissions of CsBr and CsxSnBrx+2, respectively. This work provided a new way to obtain stable Sn-based perovskite NCs and exhibited their potential for application in white light-emitting diodes (LEDs).
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 12
·期 1
·41-49
·
IF 2.786
Lan Zhou,Lu Yangcheng
Benzyl iodide, an important organic synthesis intermediate, has high reaction activity as well as high commercial value due to its weakest carbon-halogen bond. However, the development of direct iodination of toluene for benzyl iodide is limited by the fact that the C-I bond is easily decomposed under heat or light. In this work, the photoiodination of toluene to synthesize benzyl iodide in the I 2 /PhI(OAc) 2 / t BuOH system was carefully investigated in the flow photoreactor under LEDs irradiation. The reaction window suitable for the reaction kinetic characteristics recognition was revealed with the considerations of the effects of various parameters including light color, light intensity, reaction temperature, residence time, and usage of each substrate. And an optimized result is to achieve 95.83 % of yield and over 99 % of selectivity under a red light with 2.05 mW/cm 2 of light intensity at 80 o C after 15 min reaction. The reaction kinetic model coupling the iodination reaction (photo and thermal reaction) with the decomposition reaction is established, which fits well the experimental results and provides fundamentals for process design and optimization. Graphical abstract
研究领域:
有机化学
·
化学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanfei Zou,Chen Hu,Shoukun Lv,Yimeng Shao,Bing Teng,Fei You,Hui Xu,Degao Zhong
As a key material for phosphor-converted light-emitting diodes (pc-LEDs) applications, broadband near-infrared (NIR) phosphors currently face poor thermal stability issues. In this work, we synthesized a broadband near-infrared phosphor YGa3(BO3)4: Cr3+ (YGBO: Cr3+) with a high thermal stability. The YGBO: Cr3+ sample exhibits a broadband near-infrared emission centered at 770 nm with a full width at half-maximum (fwhm) of 2130 cm–1 under blue light excitation. Benefiting from the borate host crystal’s strong structural rigidity, wide optical band gap, and weak electron–phonon coupling strength, YGBO: Cr3+ demonstrates strong luminescence thermal stability, and the corresponding luminescence intensity can maintain 80% at 150 °C compared to room temperature. Furthermore, we fabricated a pc-LED device using a blue light chip and YGBO: Cr3+ phosphor, and confirmed its application potential as a near-infrared light source in the spectral analysis of fruit freshness.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
NATURE
·
2026
·
IF 56.1
Zhang Chengxi,Zeng Qingsen,Li Hui,Guo Renjun,Yu Yue,Dai Linjie,Turyanska Lyudmila,Liu Zirui,Dai Jun,Yang Yingguo,Zhao Yue,Lu Jun,Wang Lin,Kong Lingmei,Sum Tze Chien,Wu Yuchen,Lee Tae-Woo,Yang Xuyong
Quantum dot (QD) superlattices offer collective optoelectronic properties distinct from disordered solids 1 , 2 , 3 , 4 , but their integration into high-resolution display devices remains elusive because of difficulties in achieving spatially defined, structurally coherent thin films. Here we report a scalable strategy for fabricating pixelated perovskite QD (PeQD) superlattice thin-film arrays that feature in-plane long-range order, vertical confinement and precise spatial patterning. By engineering rhombic dodecahedral CsPbBr 3 nanocrystals with robust surface termination by a ligand-fluoride co-stabilization approach, we direct the formation of hexagonally close-packed superlattice films using capillary liquid-bridge confined assembly. These superlattice films exhibit reduced energetic disorder and enhanced electronic coupling. When integrated into light-emitting diodes (LEDs), the electrically driven PeQD superlattices yield an external quantum efficiency of 30.9%, high luminance of 117,144 cd m −2 and pixel densities of up to 5,080 pixels per inch. The devices show an extrapolated operational half-lifetime ( T 50 ) of 12,411 h at 100 cd m −2 —more than 1,000-fold longer than previously reported pixelated PeQD LEDs. Moreover, we demonstrate the direct integration of patterned superlattices onto a commercial thin-film transistor backplane to construct a 1.85-inch active-matrix display with full greyscale control and video playback ability. These results establish colloidal QD superlattices as a viable material platform for next-generation high-resolution, stable and efficient perovskite displays.
✓ 已验证
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Zeyu Miao,Jie Guo,Dan Jiang,Weijia Zheng,Wenxu Yin,Zhao Luo,Xinyan Zhou,Zhou Jiang,Wei Zhang,Xiuyun Zhang,Cong Chen,Xingliang Dai,Qingfeng Dong,Xuyong Yang,Ning Wang,Tom Wu,Xiaoyu Zhang,Jiaqi Zhang
Tin (Sn)-based perovskites have made notable advances with external quantum efficiency of over 20%, but still exhibit low electroluminescence brightness insufficient for outdoor displays. Here, it is demonstrated that compact phenethylammonium tin iodide (PEA 2 SnI 4 ) films with an intact crystal structure can offer high luminance by optimizing the perovskite crystallization rate simultaneously with engineering the grain surface. Ammonium thiocyanate is added to the precursor solution to generate the film with PEA 2 SnI x SCN 4- x and NH 4 I after spin-coating. Sn 2+ and SCN − have a strong interaction that slows crystallization to improve PEA 2 SnI 4 crystal quality. During the subsequent annealing, I − from NH 4 I replaces SCN − in PEA 2 SnI x SCN 4- x by forming thiourea, which can escape from the film to leave intact PEA 2 SnI 4 crystals. It is found that the optimized PEA 2 SnI 4 emitting layers can provide outstanding film coverage, high crystallinity, low trap state density, and superior photophysical performance. Consequently, an impressive brightness of 8285 cd m −2 for pure red electroluminescence is achieved, the first report of Sn-based perovskite light-emitting diodes that meet outdoor display requirements.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Yuwei Zhong,Xinran Li,Hao Zhang,Rong Zhang,Kaiwen Hu,Xuedong Zhou,Yi Xie
Despite the rising advances in the field of all-inorganic CsPb2Br5-based materials and their photoelectronic applications, the exploitation of facile synthetic procedures and enhancement of optical properties remain challenging. Herein, we report a facile room-temperature aqueous phase synthesis of orange-red-emitting cation-doped and codoped CsPb2Br5 materials with enhanced photoluminescence (PL) performance and stability. Only very weak broad PL peak at around 618 nm is observed in the undoped CsPb2Br5 microsheets. However, doping with Cu, and codoping with Cu/Mn, Cu/Zn or Cu/Cd significantly enhance the PL intensity of the resulting CsPb2Br5-based samples. The stability of the representative Cu-doped and various codoped CsPb2Br5 is evaluated under various conditions such as soaking in water, high temperature up to 150oC, and ambient environment at room temperature. This work provides facile and cost-effective path for large-scale and controlled synthesis of orange-red emmisive CsPb2Br5-based materials with enhanced optical performances, excellent environmental stability, and potentials in LEDs.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zelong Zhang,Linli Shen,Huiling Zhang,Ling Ding,Guangzhan Shao,Xiaojuan Liang,Weidong Xiang
Currently, the application of all-inorganic cesium lead halide perovskite (CsPbX 3 , X = Cl, Br, I) quantum dots (QDs) is limited due to toxicity of lead and poor ambient stability. In our work, a series of Ti-doped CsPbI 3 QDs were successfully prepared in borosilicate glass (SiO 2 -B 2 O 3 -ZnO) by the melt quenching and in situ crystallization technique. The samples showed excellent water/thermal stability, and the tunable emission (650–695 nm) was controlled by different Ti contents and heat treatment temperatures. In particular, the optical properties of CsPb 1− x Ti x I 3 QDs@glasses (x ≤ 0.5) are superior to those of pristine CsPbI 3 QDs@glass. As a result, the wLED was assembled using red-emitting CsPb 1− x Ti x I 3 QDs@glasses and yellow-emitting Ce 3+ :YAG phosphor under excitation of InGaN blue chip, which demonstrated an outstanding luminous efficiency of 102.44 lm/W, a high color rendering index of 80.6. Particularly, Ti-doped CsPbI 3 QDs@glasses with red and far-red light are combined with a blue-chip to assemble an LED device, which exactly satisfies the lighting conditions of plant growth.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-9
·
IF 2.983
Lei Wenshan,Wang Xinzhan,Liu Zhe,Lu Wanbing,Teng Xiaoyun,Cong Ridong,Song Denyuan,Yu Wei
All-in-organic cesium lead halides’ perovskites have shown great potential for light-emitting diodes (LEDs), while the low photoluminescence quantum yield (PLQY) of blue-violet emitting limits their application. In this paper, the blue-violet PL of CsPbCl 3 nanocrystals (NCs) was enhanced by Mn doping first, and the PLQY of which was further increased from 4.0 to 93.8% by the post-synthetic treatment of CdCl 2 . Microstructure analyses suggest that part of Pb ions were substituted by Mn and Cd ions, and the average size of the NCs decrease from 9.09 to 8.06 nm. Optical testing shows that both the improvement of crystalline quality and surface structure contribute to the high PLQY, and crystalline quality improvement caused by ions substitution in the NCs contributes to the stability of optical emission. The high PLQY, ease of preparation, and air stability properties of the Cd–Mn co-doped CsPbCl 3 NCs make it attractive for efficient blue and white LEDs.
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Lin Fan,Ce Li,Tao Peng,Miao Yan,Xiaoqing Pei,Yifan Liu,Weiling Yang,Shasha Li,Hai Lin,Chun Li,Lina Liu,Xuechao Yu,Fanming Zeng
Phosphor-converted white light-emitting diodes (w-LEDs) have become indispensable for modern lighting and display technologies. However, the development of efficient and thermally robust white phosphors remains a persistent challenge. Here, we report a series of Sr 3 Y 2 Ge 3 O 12 : Dy 3+ garnet-based phosphors that exhibit dual emissions at 480 and 580 nm, enabling cool-white light generation. Co-doping with La 3+ effectively lowers the crystal symmetry and narrows the band gap from 4.67 to 4.56 eV, which enhances the radiative transitions of Dy 3+ . As a result, the emission intensities at 480 and 580 nm bands are boosted by factors of 2.21 and 1.91, respectively. The spectral modification drives a chromaticity shift from cool to warm white light, with correlated color temperature decreasing from 4703 K to 2927 K. Moreover, the modified phosphors exhibit excellent thermal stability (92.51 % at 150 °C) while maintaining high internal quantum efficiency (29.43 %). When integrated with 365 nm excitation chips, the phosphors enable the fabrication of w-LEDs with tunable color temperatures. These findings offer a promising pathway for the design of next-generation high-performance warm w-LEDs.
研究领域:
材料科学
·
发光材料
·
半导体照明
·
固态物理
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Cheng Yan,Xiankan Zeng,Qungui Wang,Xiaodong Peng,Wen Li,Jingjing Cao,Yue Gao,Xiang Chu,Xuehai Fu,Shiyu Yang,Yongjian Chen,Weiqing Yang
To fundamentally understand the underlying interfacial physics of hole transporting layer is a key to rotationally engineer high-performance light-emitting diodes (LEDs). Here, we unravel the hole interlayer-dependent interfacial energetics of LEDs via combining imaged contact potential/polarization difference, and multi-time scale capacitance/voltage response. A universally existing but undesired stagnation of current density with voltages, under the direct contact of light-emitting Poly-TPD with electrodes, was proved to be rooted from the alternant dominance of capacitance/resistance behaviors with alternating strong/weak polarizations of Poly-TPD. The introduction of hole interlayer (PEDOT:PSS) with more disordered polarization direction and greater intensity can build plentiful carrier hopping channels and ensure the rapidly dynamic charge transfer from electrodes to Poly-TPD, conducing to the increased capacitive reactance contribution at low voltages and inductive effects at high voltages. Also, we clarify its frequency-response difference for emerging high-speed modulation application. This discovery might enable us to explore the next-generation high-efficiency display and optical data-communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Wang Qian,Gao Long,Yu Chenxi,Wang Meng,Gou Lijie,Zhang Jiaqi
Ligands on the surface of perovskite nanocrystals are important to stabilize the nanocrystal structure. However, the research of ligands on Mn2+ ion-doped CsPbCl3 nanocrystals (Mn: CsPbCl3 NCs), a promising candidate family for the lightning community, is relatively rare. Here, we demonstrate a new ligand modification strategy for preparing high-quality Mn: CsPbCl3 NCs by a simple hot-injection method. Thiophene derivative, for the first time, is applied as ligands for perovskite nanocrystals. The new ligands of thiophene derivatives passivate defects on the surface of NCs and enhance optical properties, originating from the sulfur in thiophene additives binding to the uncoordinated lead ions. The photoluminescence quantum yield of the modified Mn: CsPbCl3 NCs is 93% in comparison with 46% of the pristine counterparts, whose value is the highest to date for ligand-modified Mn: CsPbCl3 NCs. Meanwhile, the thermal, storage, and purification stability are also significantly improved. The performance of related LEDs is also investigated.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NATURE
·
2026
·Vol. 654
·期 8118
·375-382
·
IF 56.1
Liu Shaocheng,Pols Mike,Zhang Zhongyang,Huang Xudan,Huang Zijian,Han Ying,Guo Zhenyu,Li Liang,Fan Rundong,Zhang De-Yi,Ping Du,Yu Wenjin,Gu Jiazhen,Men Luxuan,Dong Hao,Tao Shuxia,Wang Lifen,Chen Qi,Wang Huan,Xu Huaiyu,Sun Ling-Dong,Yan Chun-Hua,Zhou Huanping
Metal halide perovskites have emerged as promising semiconductors for light-emitting diodes (LEDs) owing to their excellent luminescence properties 1 . However, their performance remains limited, primarily owing to the inherent contradiction between ‘high crystallinity’ and ‘small size’ in the in situ synthesis of perovskite nanocrystals on substrates. Here we report efficient blue perovskite LEDs (PeLEDs) achieved via in situ polymerization-driven nanocrystal confinement to synthesize perovskite films composed of high-quality nanocrystals. The in situ-formed polymer network imposes nanoscale spatial constraints during perovskite nanocrystal growth, enabling nanocrystals with small sizes and a high photoluminescence quantum yield of 83%. Furthermore, polymerizable monomers with sufficient coordination sites allow a prolonged lattice rearrangement of perovskite clusters, promoting the crystallinity of the nanocrystals. The synthesized perovskite nanocrystals are utilized in the fabrication of PeLEDs, resulting in an external quantum efficiency of 21.8% at 491 nm, which is among the highest performances in blue PeLEDs. This work simultaneously controls the thermal dynamics of perovskite crystallization and organic ligand reactions, which helps to advance understanding of the effect of ligand engineering on nanocrystal synthesis, benefiting the development of efficient PeLEDs and other optoelectronic technologies.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）