CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yufeng Zhou,Jing Ding,Ze Wang,Yao Tong,Xiaojuan Liang,Juan Du,Wei Xia,Zhengzheng Liu,Weidong Xiang
In recent years, perovskite nanocrystals (NCs) have been considered novel and potentially valuable optical gain materials that can generate relatively low thresholds and stable stimulated emissions in various external environments. Here, for the first time, an ethylene vinyl acetate copolymer (EVA) film-protected metal halide perovskite (Cs 4 PbBr 6 ) solid powder was successfully synthesized, and its photoluminescence quantum yield (PLQY) value was as high as 61%. In addition, because the Cs 4 PbBr 6 @EVA composite film has excellent optical gain performance, this work explored the optical gain of the Cs 4 PbBr 6 @EVA composite film under 800 nm femtosecond (fs) laser excitation. The experimental results show that the Cs 4 PbBr 6 @EVA composite film has a low threshold (0.89 mJ/cm 2 ) and stable stimulated emission and generates amplified spontaneous emissions (ASEs) at 544 nm. In addition, the application of Cs 4 PbBr 6 @EVA composite film in the field of white light-emitting diodes (WLEDs) has also been studied. The color gamut of this Cs 4 PbBr 6 @EVA composite film is as high as 124.7% of the National Television Standards Committee (NTSC) 1953 standard color gamut and covers 92.8% of the Rec. 2020 standard color gamut. This work proposes a simple method to solve the problem of the poor stability of perovskite solid powder, and the prepared Cs 4 PbBr 6 @EVA composite film shows significant promise in WLED and laser applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 22
·10260-10270
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IF 4.682
Zhang Fa,Lin Zhengguo,Xie Lingling,Li Xitao,Lu Bingheng,Zhao Ziheng,Jiang Ting,Wang Min,Wu Yafeng,Zhou Quan,Xiao Jiawen,Chen Bingkun,Wang Yongtian
Abstract Copper-based lead-free perovskite derivatives have recently drawn great attention for their excellent optoelectronic properties and potential applications in light-emitting diodes (LEDs) and photodetectors. Herein, facile synthesis methods of cooling crystallization and wet ball milling (WBM) are adopted to synthesize K 2 CuCl 3 , resulting in single crystals (SCs) and powder samples, respectively. The as-fabricated K 2 CuCl 3 samples exhibit blue–violet emission, with the highest photoluminescence quantum yield (PL QY) of 70% (under 280 nm excitation), and the photoluminescence (PL) is attributed to the self-trap excitons (STEs) emission. We also test the scintillation properties of K 2 CuCl 3 for X-ray detection and imaging applications. A down-conversion LED is finally made by using K 2 CuCl 3 as phosphor. Graphical abstract
As-synthesized K2CuCl3 can be used for either photoluminescence under UV
light or X-ray imaging under X-ray radiation. -- Present in ms
研究领域:
材料科学
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光学
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放射学
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DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 7
·1090
·
IF 2.467
Man Yan,Guanghui Liu,Jiahao Wen,Yinlong Wang
The system NaLa(MoO4)2:Eu3+/Sm3+phosphors were prepared by solid-state reaction followed by heat treatment at 450–600 °C. As shown by X-ray powder diffraction, the phosphors had a body-centered tetragonal structure, high phase purity and high crystallinity. The photoluminescence measurements carried out under excitation at 464 nm indicated the main emission at about 615 nm corresponding to the electric dipole transition5D0→7F2of Eu3+, which agreed well with the emission wavelengths of the GaN-based blue LED chips. In NaLa(MoO4)2:Eu3+/Sm3+phosphors, Sm3+can efficiently transfer excitation energy to Eu3+, which resulted in a significant improvement of the fluorescence intensity, and the fluorescence intensity of the phosphors calcined at 550 °C maximized at the doping concentrations of Eu3+and Sm3+of 15.0 and 2.0 mol %, respectively. The decay curves and CIE (Commission Internationale de L’ Eclairage) coordinates of Sm3+or/and Eu3+doped phosphors were analyzed for the investigation of the energy transfer mechanism and color variation trend. Thus, NaLa(MoO4)2:Eu3+,Sm3+can be classified as a potential red-emitting phosphor for white light-emitting diodes (WLEDs).Keywords:luminescence properties;molybdate;red-emitting phosphor;energy transfer
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
FERROELECTRICS
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2022
·
IF 0.695
Rong Tang,Jinyu Huang,Jing Liao,Jinjin Fu,Bin Deng,Gong-Guo Zhang,Ruijin Yu
A series of novel Sr3WO6:xDy3+ (0.01 ≤ x ≤ 0.35) yellow emitting phosphors are synthesized using the conventional high-temperature solid-state method. The phase analysis and optical properties are discussed in detail. Through the X-ray diffraction (XRD) analysis, the obtained phosphors are identified to be pure phases. The Sr3WO6:Dy3+ phosphors emit bright yellow emission light at 578 nm under 352 nm excitation, which is ascribed to the 4F9/2-6H13/2 transitions. The optimum doping concentration is 0.02 mol. The activation energy Ea is calculated to be 0.154 eV. The Commission International de L'Eclairage (CIE) coordinates and correlated color temperature (CCT) of the Sr3WO6:xDy3+ (0.01 ≤ x ≤ 0.35) is located in the yellow region. All results indicate that the Sr3WO6:Dy3+ phosphors have the potential to be applied in the white light-emitting diode (w-LED) field.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
DALTON TRANSACTIONS
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2023
·Vol. 52
·期 9
·2619-2630
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IF 4
Xuejiao Wang,Xiaowen Feng,Maxim S. Molokeev,Huiling Zheng,Qiushi Wang,Chunyan Xu,Ji-Guang Li
Phosphors that exhibit tunable broadband emissions are highly desired in multi-functional LEDs, including pc-WLEDs and pc-NIR LEDs. In this work, broadband emissions were obtained and modulated in the unexpectedly wide spectral range of 517–609 nm for (Lu0.99−xGdxBi0.01)2WO6 phosphors by tuning the Gd3+ content (x = 0–0.99). The effects of Gd3+ doping on phase constituents, particle morphology, crystal structure, and photoluminescence were systematically investigated. Broadband green emission was obtained from Gd3+-free (Lu0.99Bi0.01)2WO6 phosphors (x = 0), whose emission intensity was enhanced by 50% with 5 at% Gd3+ (x = 0.05). The phase transition happened when x > 0.50 and the broadband red-NIR emission was obtained when x = 0.75–0.99. Three luminescence centers were proved to be responsible for the broadband green emissions via crystal structure, spectral fitting and fluorescence decay analysis. A pc-WLED with a high color rendering index (Ra = 91.3), a stable emission color, and a low color temperature (3951 K) was fabricated from the (Lu0.94Gd0.05Bi0.01)2WO6 broadband green phosphor, and an LED device that simultaneously emits high color rendering index white light and NIR light was obtained with the (Gd0.99Bi0.01)2WO6 broadband red-NIR phosphor. Night vision and noninvasive imaging were also demonstrated using the latter LED device.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 13
·2110771
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IF 18.808
Liubing Fan,Ke Liu,Shihui He,Fangyi Zhao,Jing Zhao,Yonggang Wang,Quanlin Liu
Stimulus-responsive photoluminescent materials have attracted extensive research attention in recent years owing to their potential application in information storage and switch devices. It is important to further explore such bistable materials as well as the underlying transformation mechanisms. Herein, the syntheses and mechanically tunable “on–off” photoluminescence (PL) of two organic–inorganic hybrid metal halides, (Bmpip) 9 Pb 3 Zn 2 Br 19 and (Bmpip) 9 Pb 3 Cd 2 Br 19 (Bmpip + = 1-butyl-1-methyl-piperidinium, C 10 H 22 N + ), are reported. Both as-obtained compounds are nonemissive under UV light at ambient conditions but exhibit bright PL upon grinding or under hydrostatic pressure. Interestingly, the PL is quenchable by short-time annealing or storage in air for 1 week, and the process is repeatable. Through a combination of extensive structural and spectral analyses, the crucial role of the organic cations interacting with inorganic chromophores in the “on–off” PL behavior of the title compounds is revealed. Moreover, pressure-induced PL and PL-enhancement phenomena are observed in both compounds, which are similar to but slightly different than the above-mentioned mechano-PL. Finally, proof-of-concept devices are fabricated to demonstrate the potential applications of the title compounds in message recording and force sensing.
研究领域:
材料科学
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光电技术
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物理化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2023
·
IF 3.7
Zhaolun Yang,Xi Yuan,Yusheng Song,Mingyan Chen,Ke Xing,Sheng Cao,Jinju Zheng,Jialong Zhao
Mn-doped CsPbBr3 perovskite nanoplatelets (NPLs) with multicolor emission have very promising applications in light-emitting devices. However, the effects of NPL thickness on the Mn2+ luminescence properties remain to be investigated. Herein, a series of Mn-doped CsPbBr3 NPLs and nanocubes with different Mn/Pb molar ratios were synthesized by a supersaturated crystallization method at room temperature. The incorporation of Mn2+ ions into CsPbBr3 perovskites is attributed to the formation of the L2[Pb1–xMnx]Br4 intermediate structure in the precursor. The excitonic peak is tuned from 437 to 488 nm and the morphology evolves from NPLs to nanocubes with an increasing Mn2+ ion doping concentration due to the excess Br– from MnBr2. The photoluminescence quantum yields (PL QYs) of NPLs/nanocubes were greatly enhanced, achieving the maximum PL QYs of 88.7% at the Mn/Pb molar ratio of 3/1. The PL lifetime of Mn2+ emission is tuned from 0.19 to 0.44 ms due to the passivation of defect states and morphology transformation. Temperature-dependent steady-state and time-resolved PL spectra revealed that deep defect states in the NPLs/nanocubes were significantly reduced as the thickness increased. The Mn-doped CsPbBr3 NPLs/nanocubes show great potential for application in white light-emitting diodes.
研究领域:
材料科学
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光电技术
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纳米技术
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DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
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2022
·Vol. 78
·期 1
·83-88
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IF 1.712
Arif Ullah,Jinghao Zhuang,Xiaozhan Yang,Wenlin Feng
Red emitting Li 2 CaSnO 4 : x Eu 3+ phosphors were successfully synthesized by the high-temperature solid-state method. The crystal structure, composite and luminescence properties (e.g. the excitation and emission spectra, fluorescent lifetimes, and CIE chromaticity coordinates) of the samples were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), energy dispersive spectrometer (EDS) and spectral analysis technique. The emission spectra consist of the characteristic peak resultant to Eu 3+ under the excitation of 395 nm and the dominant emission peak is at 621 nm ( 7 F 0 → 5 L 6 ). The optimal red emission was obtained through 4% Eu 3+ doping. These new red Li 2 CaSnO 4 : Eu 3+ phosphors have the potential application for white LEDs.
研究领域:
材料科学
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光电技术
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固体化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 2
·293-304
·
IF 3.1
Chen Peiyu,Zhang Guoyang,Li Jiguang,Ma Lijun,Zhou Jiaying,Zhu Mingguang,Li Shuo,Wang Zhuo
The combination of near-infrared (NIR) fluorescence imaging (FLI) and photoacoustic imaging (PAI) can effectively compensate for each other’s inherent limitations, which can provide reliable and rich information on tumor biology. Therefore, the development of FL/PA dual-modality imaging probes is beneficial for achieving precision cancer diagnosis and treatment. Herein, we designed an efficient phototherapy agent methoxy bithiophene indene (OTIC), which was based on aggregation-induced emission (AIE) active fluorophores. To improve the water dispersion and enrichment of OTIC at the tumor site, OTIC nanoparticles (OTIC NPs) were prepared by a nanoprecipitation method. The balance between radiation and non-radiation energy dissipation was regulated by the strong donor-acceptor interaction and intramolecular motion. So OTIC NPs exhibited bright NIR fluorescence, photoacoustic signals, efficient generation of reactive oxygen species, and high photothermal conversion efficiency under NIR irradiation. Accurate imaging of the tumor and mice sentinel lymph nodes (SLNs) with OTIC NPs was visualized by NIR FL/PA dual-modal imaging. With the comprehensive imaging information provided by OTIC NPs in vivo , tumors were ablated under laser irradiation, which greatly improved the therapeutic efficacy. OTIC NPs would be possible to realize the precise guidance of FL/PA imaging for tumor treatment in the future clinical application.
研究领域:
生物医学工程
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肿瘤学
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纳米医学
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jian He,Bowen Wang,Changshuai Gong,Xuejiao Wang,Qiushi Wang,Ji-Guang Li
Gd 3+ co-doping is effective to enhance the photoluminescence of rare earth activators in various host due to energy transfer, however, it is rarely reported via such strategy to regulate persistent luminescence properties. In this work, Gd 3+ was co-doped into the SrLaAlO 4 : Tb persistent luminescence phosphors, and it is found that the photoluminescence and persistent luminescence of the products can be simultaneously improved. The results indicate that as the doping concentration of Gd 3+ increases, the particle diameters increase which contributes the increased luminescence. Additionally, an energy transfer process from Gd 3+ to Tb 3+ ions was observed, which enhances the emission of Tb 3+ ions. Furthermore, the persistent luminescence properties of the synthesized phosphors were improved. When the UV light source is turned off, the persistent luminescence of SrLaAlO 4 : 0.03Tb 3+ , x Gd 3+ ( x = 0.00–0.97) can last for more than 2 h, which is 100 % enhanced compared to SrLaAlO 4 : 0.03Tb 3+ . The trap distribution of SrLaAlO 4 : 0.03Tb 3+ , x Gd 3+ ( x = 0.00–0.97) phosphors was analyzed by thermoluminescence. It is found that after the substitution of La 3+ with Gd 3+ , the trap position shifted towards higher temperatures and the trap concentration increased. The initial intensity of the persistent luminescence was also enhanced after Gd 3+ co-doping. Based on the experimental findings, the luminescence and persistent luminescence mechanism of SrLaAlO 4 : 0.03Tb 3+ , x Gd 3+ ( x = 0.00–0.97) phosphors were described and discussed.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 44
·16670-16678
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IF 8.067
Peishan Shao,Puxian Xiong,Yao Xiao,Qianyi Chen,Yongsheng Sun,Na Yan,Dongdan Chen,Zhongmin Yang
Mechanoluminescent (ML) materials, which can emit light under external mechanical stimuli, have attracted much interest in diverse applications such as stress sensing, anti-counterfeiting and 3D signatures. However, ML materials located within the ultraviolet (UV) spectral range are still limited. In this study, a series of LixY0.995GeO4:0.005Bi3+ (0.898 ≤ x ≤ 1.003) samples are synthesized by a high temperature solid-state reaction method. The crystal structure, ML, persistent luminescence (PersL) and photoluminescence (PL) are systematically studied. The excellent UVA PersL of LiYGeO4:Bi3+ can be ascribed to the existence of abundant trap sites created by the intentional loss of Li+ ions, which can improve the ML properties of the phosphors. This excellent material can make up for the deficiency of PersL materials in the UVA region (315–450 nm), and it may greatly expand the application of ML materials in the biomedical, energy and catalysis fields.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 27
·1-11
·
IF 2.8
Wu Keyue,Cui Jingbiao
Cr 3+ doped ZnMgTiO 4 phosphors were successfully prepared with a high-temperature solid-state reaction method. The Cr 3+ doped ZnMgTiO 4 phosphor exhibits a near-infrared emission around 620–870 nm with a peak at 720 nm under UV 325 nm excitation. The emission peak at around 720 nm is related to the 2 E → 4 A 2 transition of Cr 3+ , which matches the absorption spectra of phytochrome P FR . The structure and crystal field environment were studied and discussed. The Cr concentration and temperature dependent photoluminescence properties of ZnMgTiO 4 : Cr 3+ were also investigated. This study indicates that ZnMgTiO 4 : Cr 3+ phosphor has a promising potential for plant cultivation.
研究领域:
材料科学
·
植物学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）