Science China-Materials
·
2025
·Vol. 68
·期 8
·2725-2734
·
IF 7.4
Wang Machao,Tang Yangmin,Pu Guiqiang,Kang Chengbin,Wang Zhiqiang,Liu Lijia,Li Jing,Zhou Zhenzhen,Chen Wei,Wang Dong,Wang Jiacheng
Self-trapped excitons are prevalent in metal halide perovskites (MHPs) characterized by soft lattices and strong exciton-phonon coupling, emitting photons with broadband emission and large Stokes shifts, rendering them particularly well-suited for applications in light-emitting diodes. But their photoluminescence quantum yields (PLQY) are limited by both high exciton binding energy and halogen-vacancy-associated non-radiative recombination. Here, we show that PLQY could be enhanced by a factor of 5.6 from 16% to 89% through doping trace Ag into Cs 2 NaBiCl 6 double perovskites, superior to those of previous Cs 2 NaBiCl 6 -based emitters. Experimental and theoretical studies reveal that trace Ag-initiated covalent interactions could reduce the exciton binding energy by 0.12 eV due to local symmetry breaking, thus improving the photoexcitation process. Also, this covalent interaction could passivate Cl vacancy defects, suppressing non-radiative recombination. Therefore, Cs 2 NaBiCl 6 : 0.7% Ag + could accumulate active self-trapped excitons to obtain high PLQY. Assembly of near-infrared light-emitting diodes using Cs 2 NaBiCl 6 : 0.7% Ag + illustrates their valuable applications in nondestructive spectral analysis and night vision illumination. This work shows an effective strategy of improving photoemission of MHPs with high PLQY for advanced optoelectronic applications.
研究领域:
材料科学
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光电子学
·
光物理
·
半导体材料
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纳米技术
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Shuo Wang,Shuhan Zhang,Xin Li,Dan Huang,William W. Yu,Liang Wang
Near-infrared (NIR) emission underpins biomedical imaging, night vision, and optical communication. Yb 3+ -doped CsPbCl 3 have demonstrated ultrahigh photoluminescence quantum yields via quantum cutting, primarily enabled by a singular defect-assisted energy transfer pathway arising from the substitution of Pb 2+ by Yb 3+ . However, whether additional pathways exist to facilitate visible (VIS)-to-NIR conversion, thereby further enhancing the performance of NIR-emissive devices, remains an open and compelling question. Here, strategic engineering of localized bound excitons (BEs) is proposed in the thermally evaporated CsPbCl 3 :Yb system. Assisted BEs significantly promote energy transfer from CsPbCl 3 matrix to Yb dopants, unveiling a previously unknown excitonic energy transfer channel. Atomic-scale characterization combined with first-principles calculations uncovers a BE-driven excitonic transfer mechanism, specifically implicating Cs-vacancy-induced defects in mediating exciton behavior. These insights lead to the fabrication of high-performance NIR-LEDs with an 8.9% external quantum efficiency and 410 mW·Sr −1 ·m −2 radiance, marking a breakthrough in thermally evaporated NIR (>950 nm) light-emitting diodes.
研究领域:
光电子学
·
材料科学
·
钙钛矿发光二极管
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能量转移物理
·
纳米材料
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 39
·2508768
·
IF 26.8
Lei Zhong,Yuefei Xiang,Shiwen Liu,Zaidong Chen,Qingyu Kong,Zhaowen Bai,Yang Ren,Fangxi Xie,Chunyan Jiang,Lei Zhou,Jean-Claude G. Bünzli,Mingmei Wu
Near-infrared (NIR) light sources hold great potential for applications in night vision illumination, bio-imaging, and non-destructive testing. However, radiationless de-activation and low absorption restrict the development of high-efficiency blue light excitable NIR phosphors, especially for emissions beyond 900 nm. Herein we report a high-performance Cr 3+ -activated forsterite (Mg 2 SiO 4 :1.5%Cr 3+ , 5%Li + ) phosphor exhibiting broadband NIR emission peaking at 960 nm with a record external quantum efficiency (EQE) up to 48%. The introduction of Li + as a charge compensator and symmetry distorter not only suppresses Cr 4+ formation but also enhances the cross section of Cr 3+ d - d forbidden transitions in Mg 2 SiO 4 . More importantly, Li + promotes excited-state energy transfer between Cr 3+ emitters, yielding exceptional thermal stability and external quantum efficiency. A fabricated NIR phosphor-converted light-emitting diode (LED) achieved a NIR radiated power of 356 mW (at a driving current of 700 mA) and an electro-optical conversion efficiency up to 12.9% (at 100 mA). This work unlocks new possibilities for smart spectroscopy applications, from non-destructive testing to human angiography and biometric recognition.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
发光
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Taifang Zhang,Dan Zhang,Zeyu Gao,Baoqi Ai,Valery F. Gremenok,Peng Wang,Chonggeng Ma
The advancement in the development of high-efficiency cyan-green emitting phosphors is pivotal for achieving high-color-quality full-visible-spectrum white light-emitting diodes (WLEDs). In this study, a series of novel cyan-green emitting BaLu 2 Al 3 ScGe 1- y Si y O 12 : x Ce 3+ (BLASGe 1- y Si y O: x Ce 3+ ) phosphors were successfully synthesized. X-ray diffraction analysis confirmed that all samples possess a typical garnet crystal structure, belonging to the Ia 3 ̅ d space group. The emission spectra of these BLASGe 1- y Si y O: x Ce 3+ phosphors effectively bridge the “cyan gap” within the 480–520 nm cyan-green emission region. Under 438 nm blue light excitation, the prepared BLASGO: Ce 3+ phosphor exhibits broad-band cyan-green emission with an emission peak at 504 nm and a full width at half maximum (FWHM) of 103 nm, thereby significantly enhancing cyan emission while preserving green emission. More importantly, by substituting Ge 4+ ions with smaller Si 4+ ions, the internal quantum efficiency (IQE) and thermal stability of the phosphor are markedly improved due to the highly symmetrical rigid structure. The optimized BLASSO: Ce 3+ phosphor demonstrates superior cyan-green emission performance with a high internal quantum efficiency of 93.28 % (an enhancement of 31.23 %) and thermal stability increased to 69.62 %. Based on the developed BLASSO: Ce 3+ cyan-green phosphor, a high-performance full-visible-spectrum WLED device was successfully fabricated, featuring a high color rendering index (CRI or R a , R a = 93.4) and a low correlated color temperature (CCT = 2814 K).
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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发光材料
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Daochuan Duan,Shijie Yu,Yubo Wu,Yan Dong,Qiyue Shao,Jianqing Jiang
Far-red-emitting (700−740 nm) phosphors are essential for the fabrication of plant lighting phosphor-converted light-emitting diodes (pc-LEDs). However, the development of highly efficient, thermally stable, and spectrally matched far-red phosphors still remains a challenge. Herein, far-red GdAlO 3 :Cr 3+ (GAO:Cr 3+ ) phosphors were synthesized via solid-state reaction and investigated for plant lighting pc-LED applications. A low-temperature flux-assisted synthesis strategy was adopted to improve the crystalline quality, suppress the defect formation, and maintain the valence state of Cr 3+ in the phosphors, finally leading to significant luminescent enhancement (∼10 times). The GAO:Cr 3+ phosphors show the 2 E sharp-line emissions around 730 nm, which is highly matched with the far-red absorption band of plants. The optimized GAO:0.01Cr 3+ phosphor exhibits a high internal quantum efficiency of 98.3% and zero thermal quenching even up to 250°C. The fabricated pc-LED can generate an overall output power of 78.1 mW at 100 mA drive current, with a high energy conversion efficiency of 25.3%. The findings demonstrate the great potential of GAO:Cr 3+ as far-red-emitting phosphor materials for plant growth pc-LED applications.
研究领域:
材料科学
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光电技术
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植物生物学
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农业工程
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DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 9
·期 1
·2101485
·
IF 6.147
Binhai Yu,Zijian Huang,Dong Fang,Shudong Yu,Ting Fu,Yong Tang,Zongtao Li
Inspired by the Cyphochilus scale with extreme whiteness, fluoropolymer is used as the matrix to prepare highly scattering porous polymer films through polymerization-induced phase separation (PIPS) method. The mixture used for the PIPS technique contains a fluoride monomer, a UV photoinitiator, and porogens (cyclohexanol and perfluorooctanol). By carefully tuning the mixture parameters (cyclohexanol–perfluorooctanol and monomer–porogen weight ratios), the porous morphology can be well tailored, which induces different scattering performances. With an optimized formulation (50 wt% monomer, 25 wt% cyclohexanol, and 25 wt% perfluorooctanol), the porous film with a thickness of 55 µm can achieve an average total reflectance of ≈90%, featuring a measured transport mean free path of 1.3–1.7 µm (comparable to the 1.5 µm of the benchmark Cyphochilus scale). Further, the porous films are applied to the light-emitting diode (LED) device and it is demonstrated that they can effectively improve the light extraction efficiency of the LED and thus enhance the luminous performance. Due to the simplicity, cost-effectiveness, and scalability of the PIPS method, the as-developed porous fluoropolymer films with such excellent scattering ability can find many potential applications not only in the field of optoelectronics, but also in various complex scenarios, such as daytime passive radiative cooling.
研究领域:
材料科学
·
光学
·
工程学
·
纳米技术
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DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 29
·2101428
·
IF 30.849
Ming Zhao,Zhiyu Yang,Lixin Ning,Zhiguo Xia
Single-component materials with white-light emission are ideal for lighting applications. However, it is very challenging to achieve white luminescence in single-dopant activated solid phosphors. Herein, white NaLi 3 Si 1− x O 4 :Eu 2+ materials are designed via defect engineering and synthesized by reducing the Si content (0.15 ≤ x ≤ 0.25). Stochiometric NaLi 3 SiO 4 :Eu 2+ exhibits a narrow-band blue emission at 469 nm, ascribed to the 5d → 4f transition of Eu 2+ at highly symmetric cuboid Na sites, while samples with Si content reduced by 15–25% display white emission with two peaks at 472 nm and 585 nm. The newly appeared broadband yellow peak arises from charge-transfer transitions involving Eu 2+ and nearby defects, as verified by an unusual bandwidth, a large Stokes shift, and a long decay time. A single-component white light-emitting diode device is fabricated by employing a white phosphor to demonstrate a color-rendering index of 82.9. This result provides a new design strategy for single-component white-light materials with broad-band defect-induced charge-transfer emission.
研究领域:
材料科学
·
光子学
·
固态化学
·
光电功能材料
·
发光材料
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Yuan Tang,Pengbo Lyu,Desheng Yin,Zhaoqi Liu,Nian Pan,Kai Li,Ying Ye,Changfu Xu,Lizhong Sun
Ultra-broadband near-infrared (NIR) lighting sources covering NIR Ⅰ to III regions are pivotal components for NIR spectroscopy devices. However, achieving ultra-broadband and efficient emission covering the entire NIR Ⅰ to III regions remains a significant challenge. To address this, we selected Mg 7 Ga 2 GeO 12 as host material to realize ultra-broadband NIR emission. Density functional theory calculations on formation energies confirmed the feasibility of doping both Ni 2+ and Cr 3+ within Mg 7 Ga 2 GeO 12 . Band structure calculations reveal a significantly reduced band gap upon the doping of Ni 2+ . Following that, we synthesized Mg 7 Ga 2 GeO 12 :Ni 2+ through conventional solid-state-reaction method. This phosphor exhibits broadband NIR emission with a full-width-at-half-maximum of 377 nm in the range of NIR II ∼ III (1100–2100 nm). To further enhance the emission efficiency, we co-doped Mg 7 Ga 2 GeO 12 :Ni 2+ phosphor with Cr 3+ . This co-doping strategy not only dramatically enhances the Ni 2+ emission intensity, but also extends the lower limit of emission band to 600 nm. However, a spectral gap around 1150 nm remains between Cr 3+ and Ni 2+ emission centers. To bridge this spectral gap, we employed LiScSiO 4 :Cr 3+ phosphor alongside Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor to fabricate a phosphor converted LED (pc-LED) with ultra-broadband NIR emission covering entire NIR Ⅰ to III regions. By utilizing this pc-LED as the lighting source for NIR spectral detection, multiple organic functional group signals can be identified simultaneously in NIR II and III bands from 1000 to 2100 nm. The performance of such an NIR pc-LED not only confirms the application potential of Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor in non-destructive spectral analysis but also underscores the feasibility of combining two phosphors to achieve ultra-broadband NIR pc-LEDs, rendering them suitable to be lighting sources for portable spectrometers.
研究领域:
材料科学
·
光学
·
光谱学
·
光子学
·
化学
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Leqi Yao,Qiyue Shao,Shouyu Han,Chao Liang,Jinhua He,Jianqing Jiang
Near-infrared (NIR) phosphors have received increasing attention for designing novel solid-state light sources with broadband NIR output. In this work, a novel NIR phosphor LiScP2O7:Cr3+ (LSP:Cr3+) is developed with the emissions (750–1100 nm) completely in the NIR spectral range. Under 470 nm excitation, LSP:0.06Cr3+ shows broadband NIR emissions peaking at ∼880 nm, with a full width at half maximum (FWHM) of ∼170 nm and an internal quantum yield (IQY) of ∼38%. Moreover, photoluminescence (PL) improvements of LSP:Cr3+ phosphors are achieved by Yb3+ codoping, leading to the broadened FWHM (up to ∼210 nm), increased IQY (ηmax = ∼74%), and reduced thermal quenching. The energy transformation processes in LSP:Cr3+,Yb3+ are quantitatively analyzed on the basis of PL lifetime and QY measurements, revealing that the PL improvements by Yb3+ codoping principally originate from the energy transfer from Cr3+ to more efficient and thermally stable Yb3+ emitters. Finally, NIR phosphor-converted light-emitting diodes (pc-LEDs) are fabricated by combining LSP:Cr3+,Yb3+ phosphors with blue LED chips, giving a maximum NIR output power of ∼36 mW and photoelectric efficiency of ∼12% at 100 mA drive current. The results suggest that the investigated phosphors would be promising luminescent converters for broadband NIR pc-LED applications.
研究领域:
材料科学
·
光电技术
·
光子学
·
固态照明
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DOI
高影响因子
SENSORS
·
2025
·Vol. 26
·期 1
·
IF 3.5
Chenglong Guo,Jiacong Xiao,Jianchun Zeng,Youjun Zeng,Yi Liu
Surface Plasmon Resonance imaging (SPRi) is a powerful label-free technique for high-throughput biochemical analysis. Wavelength modulation is particularly suitable for SPRi due to its wide dynamic range and robustness to fabrication tolerances. However, conventional systems relying on tunable filters (e.g., AOTF, LCTF) suffer from high cost, complexity, and limited temporal resolution. To overcome these drawbacks, we developed a rapid wavelength-modulation SPRi system using a multi-LED source and an adaptive second-order fitting (ASF) algorithm. The system covers the 730–805 nm spectrum with five LEDs. The ASF algorithm first performs a coarse full-spectrum scan to locate the resonance wavelength, then dynamically selects an optimal three-LED subset for fast second-order fitting, enabling accurate reconstruction of resonance wavelength without mechanical scanning. This approach significantly reduces cost and complexity while achieving a scanning cycle of 105 ms, RI resolution of 5.54 × 10−6RIU, dynamic range of 0.0241 RIU, and excellent multi-channel consistency. The system has been successfully applied to monitor multi-channel antibody–antigen interactions in real time. Furthermore, it was used to detect cartilage oligomeric matrix protein (COMP) in synovial fluid, where an elevated concentration in an osteoarthritis sample versus a control aligned with its role as a cartilage catabolism marker. This work validates a practical and reliable platform for early diagnosis of osteoarthritis.
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Huajian Ou,Lu Chen,Qiaohui Zeng,Zhiyun Peng,Zihao Lin,Ping Qi,Konglong Feng,Jing Jing Wang
A 5-aminolevulinic acid (ALA)-grafted chitin film (O-CT/ALA film) with a photodynamic inactivation (PDI) against bacteria was previously fabricated, and its preservation efficiency and mechanisms against salmon were explored. Results showed that the PDI-mediated O-CT/ALA film exhibited sustained generation capability of ROS, which had potent antibacterial activity in vitro under blue LED irradiation. Moreover, this film significantly inactivated the native bacteria and suppressed their growth in salmon fillets during storage at 4 °C and 25 °C, extending the shelf-life by >2 days compared to commercial polyethylene film. Consequently, the O-CT/ALA film retained the textural integrity of salmon muscle, stabilized the physicochemical properties of pH value, electrical conductivity, color appearance, and reduced the level of protein and lipid oxidation. Notably, it obviously reduced the accumulation of microbial metabolites and oxidation-related volatile compounds in salmon. Therefore, the PDI-mediated film shows a valid ability in preserving the storage quality of aquatic products.
研究领域:
食品保鲜
·
食品科学
·
抗菌技术
·
高分子科学
·
光动力疗法
·
水产品贮藏
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·798
·
IF 4
Zhiyong Fang,Lizhe Ma,Jieli Duan,Kefu Zhu,Xiangshu Zhang,Zhou Yang
The internal flow field and hydrodynamic properties of a photocatalytic reactor are crucial for the enhancement of degradation performance. In this study, TiO2films were loaded on the surface of quartz glass tubes and activated with UV-LEDs. Combining the degradation experiments with computational fluid dynamics (CFD) numerical simulations, the regulation laws of film surface area, flow field configuration, ratio of film surface area to solution volume (S/V), inlet flow rate and diameter on the reaction process were systematically evaluated. The results showed that the film surface area was positively correlated with the degradation efficiency of tetracycline hydrochloride (TCH). The degradation rate of TCH ranged between 32.15% and 64.83% in 12 equal film area flow field configurations. It was further found that the S/V value was positively correlated with the degradation efficiency only for the same flow field configuration, and the degradation rate of TCH was enhanced by 32.73% when the S/V value was increased from 0.018 m−1to 0.034 m−1. In addition, as the flow rate increases, the optimal inlet diameter increases accordingly (10, 25, 40, 55, and 70 mL/min corresponded to 10, 15, 20, 20, and 25 mm, respectively). The optimum structural parameters of the reactor were determined as follows: inlet flow rate of 10 mL/min, inlet diameter of 10 mm, flow field configuration type b, S/V value of 0.034 m−1, and height of 450 mm. The degradation rate of TCH under these conditions was 96.34%. The relationship between the film-reactor flow field and degradation efficiency of the photocatalytic reactor established in this study provides a reference for optimizing the design of tubular catalytic reactors.
研究领域:
环境工程
·
化学反应工程
·
计算流体力学(CFD)
·
光催化
·
反应器设计与优化
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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）