Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 2
·937-943
·
IF 6.788
Xupeng Gao,Xinyu Shen,Dingke Xue,Xin Li,Po Lu,Min Lu,Chunyan Li,William W. Yu,Xue Bai
Two-dimensional (2D) perovskites have become a research hotspot due to their large exciton binding energy and excellent stability. However, it is difficult to achieve longer wavelength emission than blue and green light in the 2D perovskites owing to their wide band gap resulting from their strong quantum confinement. Herein, we demonstrate a simple, efficient and low energy consumption crystallization method at room temperature to synthesize Mn2+ ion doped 2D (PEA)2PbBr4 nanocrystals (NCs) with dual-color emission centered at 410 nm from the exciton transition of the host and 600 nm from the d–d transition of Mn2+ ions. The periodic XRD peaks prove the formation of 2D perovskites. It is reassuring that the high PLQY of 54% has been achieved in the Mn2+ ion doped 2D (PEA)2PbBr4 NCs. The temperature-dependent and time-resolved spectra illustrate the efficient energy transfer from excitons to Mn2+ dopant ions. The realization of white LEDs with different color temperatures presents an opportunity and prospect for Mn2+ ion doped 2D perovskites in LED application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7494-7507
·
IF 4.22
Zhang Rui,Yuan Yaoxin,Zhang Jianfeng,Liu Haiyun,Chen Gang,Li Kun,Hong MengQing,Zuo Wenbin,Wang Chunlan,Yang Wen,Qin Zhenxing
Mn-doped perovskite CsPb(Cl/Br) 3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn 2+ emission peak in orange-red region via energy transfer from exciton to Mn 2+ emission. Although doping high concentration Mn 2+ could increase the Mn 2+ emission, excess Mn 2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn 2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl 3 and (Mn, Ni): CsPb(Cl/Br) 3 NCs, which introduces NiCl 2 in the Mn: CsPb(Cl/Br) 3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn 2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni 2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br) 3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 12
·3892-3897
·
IF 4.019
Xiaobin Wang,Zhishan Fang,Zhuoyi Li,Wen Ying,Danke Chen,Haiping He,Xinsheng Peng
Mercury, as one of the most prevalent toxic metals released by various natural and anthropogenic processes, causes severe pollution of soil and groundwater. In this work, R-phycoerythrin (R-PE) proteins encapsulated into ZIF-8 composite thin films were prepared via a solid-confinement conversion process and applied as fluorescent sensors for mercury ion detection. The R-PE proteins encapsulated into ZIF-8 exhibit dual color emissions including green (518 nm) and red (602, 650 nm) fluorescence, while the original orange emission (578 nm) of pure R-PE is significantly suppressed. R-PE@ZIF-8 presents excellent selectivity and sensitivity for mercury detection in a large pH range without buffer solution. Under the optimal conditions, there is a good linear relationship between the fluorescence quenching efficiencies of R-PE@ZIF-8 and logarithmic concentrations of mercury ions in the range of 0.001–50 μM with the detection limit (LOD) of 6.7 nM much lower than the guideline value given by the World Health Organization. Furthermore, multi-peak detection of R-PE@ZIF-8 improves the detection accuracy of Hg2+ concentration.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 31
·18368-18376
·
IF 3.119
Manyi Zhong,Zhuang Zhao,Yuan Luo,Fang Zhou,Yuehua Peng,Yanling Yin,Weichang Zhou,Dongsheng Tang
Recently, all-inorganic perovskites have attracted tremendous attention due to their excellent optoelectronic properties and extensive potential applications. However, these perovskites usually show a single emission wavelength because of the high ionic migration. Herein, we synthesized all-inorganic halide-mixed perovskite CsPbBrxI3−x microsheets with high crystal quality using the anti-solvent solution method and observed extraordinary green and red dual-color emission in single CsPbBrxI3−x microsheets. Power dependent PL spectra reveal excitonic and defect related recombination features of CsPbBr3 and CsPbI3 for the green and red emission. Temperature dependent PL spectra indicated a distinctive exciton–phonon coupling strength in CsPbBrxI3−x microsheets compared with pure CsPbBr3 and CsPbI3. The PL dynamics showing longer emission lifetime further confirmed this conclusion. Our work not only provides a novel strategy to produce stable dual-color emission integration, but also promotes the fundamental insight into the emission dynamics and exciton/free carrier related photophysics in all-inorganic halide-mixed perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Xiaorong Li,Ge Gao,Kaiyu Wang,Zhaoqiong Chen,Zejiang Gao,Qingyong Qin,Li Chen,Bingsuo Zou
With the increasing demand for non-contact fluorescence intensity ratio-based optical thermometry, novel phosphor materials with high-efficiency, dual-emitting centers, and differentiable temperature sensitivity are highly desired. In this work, rare earth Eu 2+ ions were incorporated into CsCu 2 I 3 microcrystals by solid–state reaction. Under a single UV excitation, the as-synthesized samples exhibit two emissions: 452 nm blue emission from the 5d→4f transition of Eu 2+ and 582 nm yellow emission from self-trapped exciton emission of CsCu 2 I 3 . The photoluminescence quantum yield reaches to 50%. The dual-band emission of Eu 2+ -doped CsCu 2 I 3 shows different temperature responses in the range of 260–360 K. Based on fluorescence intensity ratio technology, the maximum absolute sensitivity and relative sensitivity are 0.091 K –1 (at 360 K) and 2.60%/K (at 260 K), respectively. These results suggest that Eu 2+ -doped CsCu 2 I 3 could be a good candidate for highly sensitive optical thermometer.
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 COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Pengyu Zhang,Chen Li,Haoyang Guan,Yihao Wang,Chao Wang,Yiping Du,Kun Zheng,Jiawen Xiao,Zhengguang Yan
Hybrid copper(I)–based halides are important materials in radiation detection and anticounterfeiting owing to their excellent luminescence efficiency and low toxicity. This study employed a chiral racemic strategy to synthesize ( Rac -MPZ) 2 Cu 2 I 6 (where MPZ represents 2-methylpiperazine) single crystals with excitation-dependent dual-color emission. ( Rac -MPZ) 2 Cu 2 I 6 has a zero-dimensional crystal structure, which is different from the two-dimensional structure of chiral ( R / S -MPZ) 2 Cu 2 I 6 . Interestingly, ( Rac -MPZ) 2 Cu 2 I 6 exhibits excitation-dependent cyan and red emissions at room temperature (298 K), with the photoluminescence quantum yield of the cyan emission peak approaching 90 %. Its luminescence mechanism is proposed through density functional theory calculations and theoretical experiments. ( Rac -MPZ) 2 Cu 2 I 6 exhibits excellent X-ray absorption and responsivity, with a light yield of up to 34,500 photons/MeV. X-ray imaging screens developed with ( Rac -MPZ) 2 Cu 2 I 6 show an excellent resolution of >10 lp/mm. Therefore, the synthesized material has great potential for practical applications as a scintillator. In addition, its unique excitation-dependent dual-color emission property at room temperature and temperature-dependent thermochromicity have excellent potential in anticounterfeiting and information encryption, which can realize multimode and multilevel anticounterfeiting or encryption effects. This study also provides new prospects for developing multifield applications of copper(I)-based halides.
研究领域:
材料科学
·
光学
·
辐射检测
·
防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yiying Zhu,Yining Wang,Yixin Sun,Zheng Xu,Mengmeng Shang
Lead-free double perovskites (LFDPs) usually exhibit poor luminescent performance, and doping lanthanide ions (Ln 3+ ) presents a promising solution to solve this problem. However, most Ln 3+ ions face difficulties in incorporating into LFDPs due to the mismatch in radius or valence state. Here, we successfully synthesized rare-earth (RE 3+ ) based Cs 2 NaLuCl 6 (CNLC) LFDPs and achieved efficient green emission through doping Tb 3+ into CNLC. Introducing Sb 3+ improves the absorption efficiency of CNLC: Tb 3+ from 25.1 % to 73.5 % by establishing an energy transfer channel from Sb 3+ to Tb 3+ . Benefiting from the energy transfer, the CNLC: 0.01Sb 3+ , 0.10Tb 3+ phosphor produces blue-green dual emissions, highlighting its potential in white light-emitting diodes (WLEDs). In addition, an anti-counterfeiting pattern composed of CNLC: Sb 3+ , CNLC: Tb 3+ , and CNLC: Sb 3+ , Tb 3+ samples was fabricated, which shows their promising prospect in anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Chen Pu,Shan Guogang,Nie Qingli,Yan Yuting,Zhang Pengfei,Zhao Zujin,Feng Hai-Tao,Tang Ben Zhong
Despite the rapid development of probes for targeting single organelle, the construction of robust dual-organelle targeting probes with multicolor emission was rarely reported. Herein, two dual-emissive aggregation-induced emission luminogens (AIEgens) with donor-π-acceptor structures were designed and synthesized, namely QT-1 and QF-2 . Both two AIEgens exhibited excitation wavelength-dependence defying the Kasha’s rule, and could stain lipid droplets (LDs) and mitochondria in blue and red fluorescence, respectively. Moreover, thanks to the near-infrared emission and abundant reactive oxygen species (ROS) generation efficiency of QT-1 , it was chosen as a photodynamic therapy agent to selectively kill cancer cells from normal cells. Upon light irradiation, an obvious decrease of mitochondrial membrane potential (MMP) and serious change of mitochondrial shape in cells were observed, which corresponded to the efficient inhibition of tumor growth in vivo . This work afforded a promising strategy for the construction of multicolor emission by tuning anti-Kasha behaviors and expanding their application in dual-organelle targeting-based phototheranostics.
研究领域:
生物化学
·
医学影像
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 46
·e202200877
·
IF 5.02
Junfeng Qu,Shuhong Xu,Yiping Cui,Chunlei Wang
Graphical Cd-doped Cs 3 Cu 2 I 5 was synthesized by room-temperature grinding. [CuI 4 ] and [CdI 4 ] tetrahedrons act as photoluminescent centers separately, resulting in the emission colour manipulated by not only Cd feeding amount but also excitation wavelength. The as-prepared Cd-doped Cs 3 Cu 2 I 5 was made into anti-counterfeiting ink and printed on paper. The pattern shows different colours when the excitation wavelength increases from 310 nm to 330 nm. With the development of intellectual properties, concern about advanced anti-counterfeiting is accumulating, which conventional single-modal luminescence can no longer satisfy. As one of rapidly developing 0D materials, copper-based perovskite shows great potential to realize multiple luminescent centers for complex emissions. In this work, Cd was doped into Cs 3 Cu 2 I 5 and showed resultant emission at 560 nm which surprisingly showed a red-shifted excitation peak from that of intrinsic self-trapped emission, resulting in excitation-wavelength dependent emission. When the excitation wavelength increased from 290 nm to 330 nm, the emission of Cd-doped Cs 3 Cu 2 I 5 changed from deep blue to cold white and finally yellow. Afterwards, Cd-doped Cs 3 Cu 2 I 5 was mixed with polystyrene to prepare anti-counterfeiting ink for silk-screen printing. Meanwhile, Cd-doped Cs 3 Cu 2 I 5 maintains outstanding stability after doping, no matter under ambient, continuous UV radiation or high-temperature environment. The intensity can be almost totally recovered after heating-and-cooling cycles. This study lays groundwork for future research into multiple luminescent center manipulation in 0D materials.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
防伪技术
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xiaoxi Li,Mengling Xia,Weiwei Li,Ping Lu,Xianghua Zhang,Yinsheng Xu
Lead-free halide perovskites (LHP) have attracted extensive attention in the field of next-generation solid-state lighting. However, single perovskite phosphor with tunable white-light emission and ultra-high photoluminescence quantum yield (PLQY) are rare. Here, the tunable dual-color emission LHP phosphor is developed with a near-unity PLQY of 99.5%. The LHP phosphor comprises Cs 2 NaInCl 6 : Sb 3+ /Bi 3+ and Cs 2 InCl 5 ·H 2 O: Sb 3+ /Bi 3+ crystals, with the transition between these two perovskite structures being adjustable by the concentration of Na + . The addition of NaCl inhibits the hydrolysis of the [Sb(H 2 O)Cl 5 ] 2− octahedron, resulting in 3D connected [SbCl 6 ] 3− octahedron with less Jahn-Teller distortion, and the PLQY of LHP is greater than 90%. Finally, the white-light diode device is fabricated by assembling the LHP with a ultraviolet light-emitting diode chip and the white light-emitting diode device achieved Commission Internationale de l'Eclairage color coordinates of (0.34, 0.33), correlated color temperature of 4936 K, and a high color rendering index of 92.9. The LHP perovskite exhibited multimodal luminescence when excited by 365, 335, and 310 nm UV light, showing the multi-mode anti-counterfeiting capabilities of the LHP crystals.
研究领域:
材料科学
·
光学工程
·
能源技术
✓ 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）