CRYSTAL GROWTH & DESIGN
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2021
·
IF 4.076
Jing Wang,Shuping Xu,Houyu Zhang,Lei Chen,Shulin Guan,Weiqing Xu
A novel strategy for constructing the organic core–shell structures/heterostructures (OCSHs) was developed by the surface doping of a charge transfer (CT) Py-TFP cocrystal (Py = pyrene; TFP = tetrafluoroterephthalonitrile) with the donor (D) or acceptor (A) replacement reaction. The lattice-selective doping of Pe (Pe = perylene) or TCNB (TCNB = 1,2,4,5-tetracyanobenzene) molecules on the Py-TFP surface resulted from both the molecular size match/mismatch and the distribution of the intermolecular hydrogen bonds. Spectroscopic analyses disclosed that the components of two types of lattice-oriented external shells, (Py-TFP)1–x(Pe-TFP)x and (Py-TFP)1–y(Py-TCNB)y, have the doping ratios of 0 < x ⩽ 2.00% and 0 < y ⩽ 4.03%, respectively. Their di-block core–shell heterostructures display the spatially segregated yellow-blue dual-color emission and the position-dependent optical waveguide with active and passive waveguide modes. Meanwhile, the Pe doped Py-TFP core–shell cocrystal presents (1,0,0) and (0,1,1) lattice-dependent emission and lightwave transmission. This study provides an effective fabrication strategy for the OCSH construction, and this core–shell cocrystallized heterojunction can be available for photonic and optoelectronic functional applications.
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
·
2019
·
IF 4.175
Z.M. Yu,L.F. Shen,D.S. Li,E.Y.B. Pun,J. Guo,H. Lin
Tb(acac) 3 (TAH) and Eu(TTA) 3 Phen (ETP) doped polyacrylonitriles (PAN) have been electrospun into heterogeneous hybrid TAH/ETP/PAN and core-shell structured [(TAH/PAN) core + (ETP/PAN) shell ] wire-shaped flexible nanofibers with diameter of ∼350 nm. Differential photon releasing behaviors reveal the double-color-emitting potential of Tb 3+ /Eu 3+ combination systems and verify the effectiveness of coaxial configuration in avoiding the cross-relaxation between different rare earth ions. Luminous fluxes of the hybrid and the coaxial systems exceed 283.5 and 326.3 μlm under the excitation of 308 nm UVB-LED pump source, respectively. By adopting coaxial electrospun configuration, the color coordinates are tuned from (0.561, 0.332) in TAH/ETP/PAN to (0.435, 0.366) in [(TAH/PAN) core + (ETP/PAN) shell ] fibers, which demonstrates that the core-shell structure is promising to extend the dimension of color tuning. Nanofibrosis and electrospun configurations furnish a desired approach to develop multifunctional one-dimensional nanomaterials for color displays and optoelectronic sensors .
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Nano Research
·
2019
·Vol. 12
·期 7
·1733-1738
·
IF 8.515
Dong Lvming,Chen Zhuo,Ye Lei,Yu Yan,Zhang Jianbing,Liu Huan,Zang Jianfeng
Mn-doped all-inorganic perovskite quantum dots (QDs) provide prominent applications in the fields of low-cost light source or display, because of their remarkable properties including dual-color emission and reduced lead content, as well as high photoluminescence quantum yields (PLQYs) and high stability. However, the existing synthesis approaches usually require hash conditions, such as high temperature and nitrogen protection, which is a major hurdler for the practical manufacturing. In addition, the significantly high Mn substitution ratio in CsPbX 3 QDs is still challenging. The real dual-color emission with two strong emission peaks in the Mn-doped all-inorganic perovskite QDs has attracted great interest. Here we present a gram-scale approach to synthesize both CsPb x Mn 1− x Cl 3 and CsPb 1− x Mn x Cl y Br 3− y QDs at 100 °C in the air with high Mn substitution ratio, up to 55.64% atomically. The as-prepared CsPb 1− x Mn x Cl y Br 3− y QDs exhibit high PLQYs of 62.41% and dual-color emission with two strong emission peaks around at 400–450 nm and 600 nm, respectively. The enhanced peak at 400–450 nm is a result of the hybrid halides in CsPbBr x Cl 3− x host. Furthermore, the unique advantage of the optical emission and high PLQYs properties of the CsPb x Mn 1 − x Cl 3 QDs has been demonstrated as invisible ink for encryption applications and polymer composites. Our gram-scale synthesis approach for Mn-doped all-inorganic perovskite QDs may boost the future research and practical applications of QDs-based white LED, spintronics, and molecular barcoding.
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 MATERIALS SCIENCE
·
2021
·Vol. 56
·期 21
·12326-12335
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IF 4.22
Qu Junfeng,Xu Shuhong,Liu Fan,Wang Zhuyuan,Shao Haibao,Cui Yiping,Wang Chunlei
Abstract Compared with widely studied lead halide perovskite, copper halide perovskite is toxic-free and combines better stability with comparable photoluminescence quantum yield. Cation doping has proven to be an effective way to manipulate optical and electronic properties of perovskite. Unlike lead halide perovskite able to act as the host of different kinds of dopant, copper halide perovskite acting as host material is still a great challenge. Herein, Mn was successfully doped into Cs \(_3\) Cu \(_2\) I \(_5\) under room temperature via solid-state reaction. In addition to original self-trapped emission of Cs \(_3\) Cu \(_2\) I \(_5\) at 445 nm, Mn dopant introduced characteristic emission at \(\sim \) 550 nm and realized dual color emission tuned by feeding ratio, extending chroma of Cs \(_3\) Cu \(_2\) I \(_5\) in blue region. Meanwhile, ultraviolet photo-electron spectra results confirmed that Mn \(^{2+}\) ion replacing Cu \(^+\) resulted in p-type doping in Cs \(_3\) Cu \(_2\) I \(_5\) . The as-prepared Mn:Cs \(_3\) Cu \(_2\) I \(_5\) microcrystals show excellent stability with almost unchanged PL intensity within 15 days. Graphical abstract
Synthesis of p-type Mn:Cs3Cu2I5 with dual-color emission through room-temperature grinding method.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Photonics
·
2025
·
IF 6.7
Qiuyi Zhang,Qi Huang,Zikai Zhu,Dacheng Xia,Chenxu Sheng,Shoaib Awan,Ziyang Song,Fengxian Xie,Chunxiao Cong,Zhi-Jun Qiu,Laigui Hu,Ran Liu
Although organic light-emitting diodes (OLEDs) have been widely employed in displays and flexible electronics, the implementation of micro-OLED arrays still remains a challenge due to the limitations of the mainstream fine metal mask (FMM) technology. Pixel sizes below 30 μm are typically hard to achieve in order to match the requirement (i.e., sub10 μm) of the emerging near-eye displays mainly due to the so-called “screen-door effect”. Conventional lithography used for high-resolution inorganic micro patterns cannot be directly applied owing to the instability of organic materials. Furthermore, damage-free techniques such as inkjet printing also encounter resolution limitations. Self-assembled monolayer (SAM)-assisted patterning and surface-microstructure-assisted patterning techniques, though promising, have so far only been applied to fabricate single-color micro-OLEDs. In this work, high-resolution micro-OLED arrays with dual-color emission were demonstrated using a phase-change material (PCM) or an aggregation-induced emission (AIE) material. Fabricated via the SAM-assisted patterning technique, the PCM dot array exhibits red emission in its amorphous phase and transitions to green emission upon annealing-induced crystallization. Leveraging this unique dual-color capability, micro-OLEDs with 5 μm pixels (2600 PPI) and dual-color emission were achieved after the preparation of other functional layers.
研究领域:
材料科学
·
显示技术
·
光电子学
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纳米技术
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薄膜器件
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901082
·
IF 7.125
Daqin Chen,Su Zhou,Feifan Tian,Haitao Ke,Naizhong Jiang,Shujin Wang,Yongzhao Peng,Yue Liu
Recently, Mn 2+ -doped CsPb(Cl/Br) 3 perovskite nanocrystals (NCs), showing the advantages of dual-color emissions via exciton-to-dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ -doped CsPb(Cl/Br) 3 NCs still need to be further improved. Here, a halogen-hot-injection strategy is developed to prepare Mn:CsPb(Cl 0.6 Br 0.4 ) 3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T 1 → 6 A 1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof-of-concept experiment, the present Mn 2+ -doped CsPb(Cl/Br) 3 perovskite NCs with highly efficient dual-color emissions are demonstrated to be applicable as color converter in UV-excitable solid-state lighting.
研究领域:
材料科学
·
纳米技术
·
光电
·
化学
✓ 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）