CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qinan Mao,Gan Li,Xinyu Shen,Junhua Xi,Lang Pei,Xinyue Li,Jiasong Zhong
Currently, Mn 4+ -activated phosphors have attracted extensive attention for their versatile applications in general lighting, display and plant cultivation. Owing to 3d 3 electronic configuration of Mn 4+ ion, modifying its local coordination environment emerges as a potent method to tailor its luminescence behavior. Herein, a heterovalent substitution strategy is reported to greatly enhance the photoluminescence (PL) of Ba 2 CaWO 6 :Mn 4+ . The effects of the substitution of rare-earth ions (Ln 3+ = Lu 3+ , Y 3+ , Gd 3+ , La 3+ ) for Ca 2+ ions on the PL properties of the phosphor are studied in detail. The PL spectral change of Mn 4+ induced by Ln 3+ substitution is clarified in terms of the local structure of [WO 6 ] octahedron and the valence state of Mn. By selection of Ln 3+ ions and optimization of Ln 3+ doping concentration, the emission intensity of Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor reaches up to 46.3 times as that of Ba 2 CaWO 6 :0.25Mn 4+ . Besides, the Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor exhibits an internal quantum yield of 56.9 % and a thermal stability of 72.6 %@423 K. Finally, Ba 2 Ca 0.85 Ln 0.15 WO 6 :Mn 4+ based phosphor conversion LED devices are demonstrated, which can be potentially employed for indoor plant lighting.
研究领域:
材料科学
·
光电技术
·
照明技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 27
·53694-53702
·
IF 5.6
Ke Chen,Cheng Zhou,Peixin Gao,Hanzi Jiang,Ming Cheng,Sanlin Liu,Wai-Yeung Wong,Zhi Zhou,Mao Xia
In recent years, Mn 4+ doped oxide phosphors have attracted extensive attention in the field of indoor plant light supplementation due to their red emission. In this study, a rare earth-free red phosphor, Li 3 Mg 2 NbO 6 (LMN):Mn 4+ , was prepared by high-temperature solid-state reaction. The resultant phosphor exhibited red emission within the 600–800 nm band, with a peak at 668 nm, when excited by 351 nm and 468 nm. DFT calculations of charge density and formation energies determined that Mn 4+ tends to occupy the Mg 2+ sites, leading to a charge imbalance that affects the luminescence intensity of the material. In light of the foregoing, charge compensation strategy was adopted in order to achieve charge balance through excessive doping of Li + , Na + and K + alkali metal ions. The optimal doping concentrations of Li + , Na + and K + were determined to be 0.35, 0.4 and 0.3, respectively. The luminescence intensity of LMN:Mn 4+ phosphors was found to increase to 453%, 500% and 708% of the initial intensity. Concurrently, the quantum efficiency (QE) of the phosphor LMN:Mn 4+ was enhanced from 33.8 % to 48.1%, 57.04% and 69.19%, respectively, by means of additional doping with Li + , Na + and K + . At 100 °C, the emission intensity of the LMN:0.01Mn 4+ phosphor was found to be 73.6% of that at room temperature (25 °C). The thermal stability of additional Li + , Na + and K + by charge-compensated doping is slightly reduced. Finally, LMN:0.01Mn 4+ , 0.3K 2 CO 3 phosphor and a blue light chip were used to prepare the phosphor conversion light-emitting diodes (pc-LEDs). The electroluminescence spectra of the pc-LEDs exhibited a blue and red double emission, corresponding to the absorption bands of chlorophyll B and photochrome P R . This finding indicates that pc-LEDs have considerable potential for application in the field of plant growth LED lamps.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Chen Chang,Shixu Tao,Chang Xu,Yu Zhang,Wenxin Jiang,Yongge Cao,Chaoyang Ma
Colloidal CsPbX3 (X = Cl, Br, I) quantum dots (PQDs) typically suffer from severe degradation under heat, moisture, and UV/blue light irradiation, primarily due to the dynamic detachment and mismatch of surface ligands. Recently, ligand-free template-assisted strategies have emerged as an effective approach to address these challenges by regulating PQD growth through spatial confinement within nanoporous matrices. However, most reported systems are restricted to powder or thin-film forms and lack a robust, transparent, and device-compatible macroscopic architecture. In this work, we for the first time report a ligand-free in situ confined growth strategy for PQDs within a transparent nanoporous poly(methylsilsesquioxane) (PMSQ) xerogel monolith. The nanopores of the hydrophobic PMSQ template provide effective spatial confinement for the PQDs, which suppresses aggregation of PQDs and reduces nonradiative trap states, thereby enabling a high photoluminescence quantum yield exceeding 92% and excellent thermal stability, moisture stability, and photostability. Furthermore, the strategy is extended to synthesize CsPbX3 (X = Cl, Br, I) QDs@PXMs with tunable emission across the visible spectral range from 417.6 to 674.2 nm. A white light-emitting diode fabricated using CsPbBr3 QDs@PXMs and commercial K2SiF6: Mn4+ phosphors achieves a luminous efficiency of 110 lm W–1 and a wide color gamut reaching 133% of the NTSC 1931 standard. These findings demonstrate that CsPbX3 QDs@PXMs constitute robust and high-performance PQD-based composite materials suitable for high-quality lighting and wide-color-gamut display applications.
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DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400447
·
IF 9.8
Fangyi Zhao,Yuhe Shao,Quanlin Liu,Jiasong Zhong
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) light sources in the second NIR window (NIR-II, 1000–1700 nm) have sparked great interest for their emerging applications in non-destructive detection and medical diagnostics fields. However, the development of efficient NIR-II phosphors that can be excited by commercial blue LED chips remains a significant challenge, and thus impeding the applications of NIR pc-LED. Herein, a blue-light-excitable broadband NIR-II luminescence of Ni 2+ is achieved upon incorporating Cr 3+ and Ni 2+ into the Ca 3 Ga 2 Ge 3 O 12 (CGGO) host simultaneously. Through the energy transfer from Cr 3+ to Ni 2+ , CGGO:Cr 3+ ,Ni 2+ phosphor presents the improved NIR-II emission peaking at 1470 nm under 460 nm blue light excitation. The internal/external quantum efficiency values are significantly improved from 13.8%/3.3% to 24.6%/13.3% along with the enhanced luminescence thermal stability. Finally, a NIR pc-LED is fabricated by combining CGGO:Cr 3+ ,Ni 2+ phosphor with 450 nm blue chip, and its potential applications in non-destructive examination and biomedical imaging fields have been demonstrated. The strategy of Cr 3+ and Ni 2+ co-doping solves the problem that Ni 2+ luminescence cannot be effectively excited by blue light and provides the design insights to exploit more ultra-broadband NIR pc-LEDs based on blue LED chips.
研究领域:
材料科学
·
生物医学工程
·
光学成像
·
非侵入性检测
·
分子影像学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yongsheng Yang,Siyuan Tang,Da Chen,Changxing Wang,Bingli Gu,Xiameng Li,Feng Xie,Gang Wang,Qinglei Guo
In this study, red-emission graphene quantum dots (R-GQDs), with tunable emission wavelength , are synthesized and explored for applications in trace water sensing, white light emitting diodes (WLEDs) and information encryption . Systematic experiments and characterizations demonstrate that the as-fabricated R-GQDs possess homogeneous size, good crystallinity and high doping concentration of nitrogen and oxygen. Moreover, tunable multicolor light emissions of R-GQDs are demonstrated by simply adjusting the polarity of surrounding solvents. As a result, solid-state fluorescence films are successfully fabricated to construct a high-quality WLED, with the CIE (Commission International d′Eclairage) coordinates (0.352, 0.380) and color temperature of 5121 K. Besides, the water quenchable fluorescence of R-GQDs enables the fabrication of a trace water sensing platform, with the low detection limit of 0.034%. Finally, the potential of our prepared R-GQDs for the application in color visual information encryption is developed. This study may pave the way for the development of GQDs, especially in optically sensing, optoelectronics and anti-counterfeiting technology.
研究领域:
纳米材料学
·
光学传感
·
光电子学
·
分析化学
·
防伪技术
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DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Chengliang Lyu,Dashuai Sun,Zeyu Lyu,Sida Shen,Pengcheng Luo,Zhihang Yue,Zheng Lu,Luhui Zhou,Hongpeng You
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) light sources have great potential for applications in information encryption , night vision, and non-destructive testing. However, designing efficient NIR phosphors with wide emission band remains a significant challenge. Here, we report a garnet-type NIR phosphor Gd 2 Mg 3 Ge 3 O 12 :Cr 3+ ,Yb 3+ (GMG:Cr 3+ ,Yb 3+ ). The GMG:0.06Cr 3+ phosphor shows a broadband emission peaking at 828 nm under 450 nm excitation, with a full width at half maximum (FWHM) of 188 nm. When Yb 3+ ions are introduced to construct Cr 3+ -Yb 3+ energy transfer, the obtained GMG:Cr 3+ ,Yb 3+ phosphor displays further widened emission band with a FWHM of 272 nm. Moreover, GMG:Cr 3+ ,Yb 3+ phosphor and commercial blue LED chips are combined to create NIR pc-LEDs, which have a photoelectric efficiency of 5.76% @ 100 mA and a maximum NIR output power of 17.21 mW @ 100 mA, demonstrating its potential applications in night vision, non-destructive testing, and information encryption.
研究领域:
材料科学
·
光电子学
·
固态照明
·
光子学
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DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Tongtong Kou,Qilin Wei,Tong Chang,Hua Wang,Wei Zheng,Xiaomei Jiang,Qiang Zhao,Zijian Zhou,Dan Huang,Zhaolai Chen,Liang Wang,Jiang Tang,William W. Yu
All-inorganic Cd-based metal halide is widely studied and applied in the field of optoelectronics due to its superior stability, diverse phase structure, and unique photoelectric properties. However, all-inorganic 0D Cd-based metal halide is not widely studied due to their extreme synthesis conditions. In this paper, a simple mild solution method is devised to successfully synthesize 0D Cs 3 CdBr 5 by manipulating the crystal growth kinetics. Simultaneously, the influence of the doping element Mn on the transition matrix and the optical properties are investigated. By doping with an appropriate concentration of Mn 2+ , a green emission (520 nm) with photoluminescence quantum yield (PLQY) as high as 97.39% is obtained. Benefiting from near-unity PLQY and the excellent optical properties, the white emitting light-emitting diodes (WLEDs) with Cs 3 CdBr 5 :20%Mn as green phosphor exhibit warm white light emission with color rendering index (CRI) of 91 and correlated color temperature (CCT) of 4108 K. In addition, Cs 3 CdBr 5 :20%Mn also demonstrates excellent X-ray scintillation properties with a low detection limit of 32.83 nGy air ·s −1 . The results show that Cs 3 CdBr 5 :Mn is not only a promising candidate for solid-state lighting but also a promising candidate for low-dose high-resolution X-ray imaging.
研究领域:
光电学
·
材料科学
·
光子学
·
放射学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 20
·1-10
·
IF 2.8
Ji Changjian,Zhang Hailong,Wang Wenjing,Yuan Huimin,Zhao Gang
In order to acquire a red light-emitting component for an efficient w -LEDs device, we synthesized a series of Eu 3+ -doped Sr 2 GaTaO 6 (SGT) phosphors using a traditional high-temperature solid-phase technique. The results of UV diffuse reflectance proved that the SGT host possesses a broad optical energy bandgap ( E gap ) of 4.47 eV (calculated value). The relevant characteristic spectra were also tested. By monitoring the emission at 612 nm, the excitation peak at 466 nm matches the blue light region (460–470 nm) of the popular blue LED chips on the market. The photoluminescence (PL) spectra of SGT: Eu 3+ phosphors at room temperature consisting of four obvious PL bands ( 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 ) in the visible range. And the PL properties are necessarily analyzed by fluorescence decay curves. And it exhibits a decent photoluminescence quantum yield (39.88%). Moreover, the color purity and the ∆E of the SGT: 0.2Eu 3+ sample are 96.5% and 0.29 eV, respectively, demonstrating that the ∆E of SGT: Eu 3+ phosphor is superior to other reported Eu 3+ -doped materials for w -LEDs applications. The results manifest that the Eu 3+ doped SGT phosphors can be outstanding candidates for w -LEDs applications with high color purity and activation energy.
研究领域:
材料科学
·
光电
·
固体化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·65882-65888
·
IF 5.6
Yonglin Chen,Haoyi Wu
In this work, Li 3 Mg 2 TaO 6 :Cr 3+ phosphors were designed and synthesized by solid-phase method. Spectra show that the Cr 3+ -doped phosphors exhibit broadband emissivity in the range of 700–1200 nm, with a full width at half maximum (FWHM) of approximately 165 nm at wavelength excitation at 462 nm. The internal quantum efficiency (IQE) of phosphors is 63.1 %. Under a driving current of 270 mA, the output power of the device can achieve 36.2 mW. Combining Li 3 Mg 2 TaO 6 :Cr 3+ phosphor and a 460 nm blue chip, a near-infrared pc-LED was fabricated and demonstrated for night vision of objects, as well as rapid imaging of the veins of a fist.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ziqiang Jiang,Laian Sheng,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
In present work, Ce 3 + -doped Y 3 Al 5 O 12 (YAG: Ce) transparent ceramics were fabricated via spark plasma sintering (SPS) using Si 3 N 4 as a multifunctional sintering additive. The effects of Si 3 N 4 on the microstructure, densification behavior, and luminescent properties were systematically investigated. It is demonstrated that Si 3 N 4 could be effectively incorporated into the YAG lattice through a charge-balanced substitution mechanism in which Si 4+ -N 3- pairs replace Al 3+ -O 2- , resulting in a significant redshift of the Ce 3+ emission from 545 nm to 582 nm due to enhanced crystal field splitting and nephelauxetic effects. Furthermore, the substitution process also yields in-situ formation of SiO 2 , which promotes densification via liquid-phase sintering, achieves a relative density exceeding 99.5 %, and partially mitigates carbon contamination. When applied in phosphor-converted white LEDs, the Si 3 N 4 -doped YAG: Ce ceramics enabled a substantial reduction in correlated color temperature (CCT) from 4903 K to 3196 K, demonstrating their potential as efficient warm-white light converters without requiring additional red phosphors.
研究领域:
材料科学
·
无机非金属材料
·
发光材料
·
固态照明
·
陶瓷工艺
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 35
·期 8
·2209002
·
IF 32.086
Jibin Zhang,Tiankai Zhang,Zhuangzhuang Ma,Fanglong Yuan,Xin Zhou,Heyong Wang,Zhe Liu,Jian Qing,Hongting Chen,Xinjian Li,Shijian Su,Jianing Xie,Zhifeng Shi,Lintao Hou,Chongxin Shan
Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I) 3 nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability on account of the surface halide vacancies-induced nonradiative recombination loss, halide phase segregation, and self-doping effect. Herein, a “halide-equivalent” anion of benzenesulfonate (BS – ) is introduced into CsPb(Br/I) 3 NCs as multifunctional additive to simultaneously address the above challenging issues. Joint experiment-theory characterizations reveal that the BS – can not only passivate the uncoordinated Pb 2+ -related defects at the surface of NCs, but also increase the formation energy of halide vacancies. Moreover, because of the strong electron-withdrawing property of sulfonate group, electrons are expected to transfer from the CsPb(Br/I) 3 NC to BS – for reducing the self-doping effect and altering the n-type behavior of CsPb(Br/I) 3 NCs to near ambipolarity. Eventually, synergistic boost in device performance is achieved for pure-red PeLEDs with CIE coordinates of (0.70, 0.30) and a champion external quantum efficiency of 23.5%, which is one of the best value among the ever-reported red PeLEDs approaching to the Rec. 2020 red primary color. Moreover, the BS – -modified PeLED exhibits negligible wavelength shift under different operating voltages. This strategy paves an efficient way for improving the efficiency and stability of pure-red PeLEDs.
研究领域:
材料科学
·
光电材料
·
纳米技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Li Chen,Junting Chen,Chunyu Wang,MeiLing Chen,Fangyin Zhu,Zhengye Xiong,Jingyuan Guo
A dual-functional luminescent materials NaYSrWO 6 :xEu 3+ (x = 0.005,0.01,0.05,0.1,0.15,0.2,0.3,0.5) with a double perovskite structure was synthesized using a high temperature solid state reaction method. Systematic investigations of their photoluminescence, thermoluminescence and radiation luminescence properties were carried out. Under blue light excitation, Maximum PL intensity was achieved with Eu 3+ doping concentration of x = 0.15. Excited at 325 nm, the material exhibited characteristic red emission of Eu 3+ with quantum efficiency reaching 64.4 %, CIE color coordinates of (0.607, 0.358), color purity of 87.21 %, correlated color temperature of 1970 K, and activation energy of 0.214 eV. These parameters satisfy the critical requirements for phosphors in indoor LED lighting systems.The thermoluminescence curve of the sample shows two apparent peaks at approximately 407K and 460K temperatures.The material demonstrated superior thermoluminescence performance at doping concentrations (x = 0.3). TL response increased linearly with increase in dose rate within 0.266–2.1 Gy/min, indicating potential for real-time low-dose-rate radiation monitoring. After X-ray irradiation, it features fast saturation, stable luminescence, short afterglow, and excellent repeatability. This study confirms that the double perovskite tungstate NaYSrWO 6 :xEu 3+ simultaneously achieves efficient photoluminescence and radiation-responsive characteristics, demonstrating promising applications in white LED lighting, real-time dosimetry, and X-ray imaging technologies.
研究领域:
材料科学
·
光学材料
·
固态物理
·
发光学
·
辐射探测
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DOI
高影响因子
危险品化学品经营许可证（带存储）