ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wenbo Ji,Fengmei Zhu,Yuan Gao,Jianbei Qiu
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs), a widely used NIR light source, are typically prepared by sealing the NIR phosphor powder and an LED chip with epoxy resin. One issue that NIR pc-LEDs frequently encounter is the aging and deterioration of epoxy resin over time, which leads to self-absorption and a sharp decline in emission efficiency. Here, we report the synthesis of a chemically stable NIR luminescent material composed of Cr3+-doped Ba2NaNb5O15 nanocrystals measuring 10–15 nm, with Cr3+ ions located in the octahedral centers of the nanocrystals. Under 460 nm light excitation, the transparent glass-ceramic exhibited a broadband NIR emission in the range of 600–1400 nm, which originated from the electronic transition of Cr3+ from the excited state of 4T2 to the ground state of 4A2. The emission peak was located at ∼810 nm, the FWHM was ∼230 nm, and the internal quantum efficiency reached ∼0.81%. We constructed a stable NIR pc-LED device using optimized transparent NIR-emitting glass-ceramics and a commercially available blue LED chip, demonstrating its promising application in night-vision lighting. Our study provides a basis for the preparation of transparent glass-ceramic-based NIR pc-LED devices as an improved alternative for solid-state illumination.
研究领域:
材料科学
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光学工程
·
固体照明
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Hang Liu,Haozhou Tian,Chunhui Sun,Qiang Wang,Hongqun Zhu,Xuezhong Yang,Haoran Wang,Yuhong Zhang
A series of Nd3+/Yb3+ co-doped Ca2LaTaO6 (CLTO) phosphors are synthesized by a high temperature solid phase method. Structural characterization confirms the successful incorporation of Nd3+ and Yb3+ ions into the CLTO host lattice. The photoluminescence excitation (PLE) spectra and photoluminescence (PL) spectra of CLTO:Nd3+ and CLTO:Nd3+/Yb3+ are investigated in detail. Under the excitation of ultraviolet (UV) and visible (VIS) light, the CLTO:Nd3+/Yb3+ phosphor emits broadband near infrared (NIR) luminescence. In particular, the luminescence intensity of the Yb3+ ion is increased through an energy transfer (ET) process from Nd3+ to Yb3+. The luminescence mechanism of the CLTO:Nd3+/Yb3+ sample is analyzed based on the decay lifetime and PL spectra. In addition, the NIR emission intensity of Yb3+ ions is also enhanced by doping K+ ions. The broadband luminescence (850–1050 nm) of the CLTO:Nd3+/Yb3+/K+ phosphor has good application in solar cells and anti-counterfeiting.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Siqi Fan,Xu Yao,Jingfang Li,Weizuo Li,Guangming Li
In view of the potential application of NIR luminescence in biology, a series of four new 3,5-Heptanedione (β-diketonate) ytterbium complexes, e.g. [Yb(L) 3 (H 2 O) 2 ] ( 1 ), [Yb(L) 3 (2,2′-bpy)] ( 2 ), [Yb(L) 3 (dpq)] ( 3 ) and [Yb(L) 3 (dppz)] ( 4 ) have been designed and isolated. Crystal structures analysis show that all complexes 1 – 4 exhibit the similar mononuclear structure, in which the central Yb 3+ ion is eight-coordinated forming the square-anti-prismatic geometry. NIR luminescence of all complexes 1 – 4 shows strong characteristic emission of Yb 3+ ions. To improve the mechanical and thermal stability, complex 1 was further doped into poly-(methyl methacrylate) (PMMA) for preparing a thin film ( 1 @PMMA). Their thermal stability and NIR luminescence were essentially enhanced in contrast to that for complex 1 . This NIR luminescent thin film may be of potential applications in biological dictation and luminescent probe.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Weichang Li,Qiang He,Jixi Xu,Chongyun Shao,Shiyu Sun,Shaohua Fan,Lili Hu
The efficient NIR-to-NIR upconverter of LiYF 4 :Yb 3+ ,Tm 3+ (simplified as LYF:Yb,Tm) was synthesized by a modified hydrothermal method in this work. The synthesized LYF:Yb,Tm has well controlled morphology of monodisperse micrometer sized octahedrons. XRD pattern confirms its pure tetragonal LiYF 4 structure. The LYF:Yb,Tm exhibits a dominating NIR UC emission at ~793 nm along with relative weak blue and red UC emissions under 976 nm LD excitation. The optimal concentrations of Yb 3+ and Tm 3+ ions for NIR up-conversion (UC) emission are 20 mol% and 0.6 mol%, respectively. The internal UC quantum yield (IUCQY) of this LYF:Yb,Tm in NIR band is tested to be 5.1% at 959 nm LD excitation power density (PD) of 120 W/cm 2 . The UC emission mechanism is discussed based on UC fluorescent behaviors of Yb 3+ and Tm 3+ . The results of fluorescent labeling indicate its potential applications in fluorescent markers, solar cells and 3D flat panel displays .
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Tong Feng,Yuanlin Jin,Zhangwen Long,Dacheng Zhou,Xiaqing Jiang,Bitao Liu,Jianbei Qiu
Phosphor conversion light-emitting diode (PC-LED) technology has become a focal point of research for portable near-infrared light sources in recent years. One of the crucial aspects is to develop phosphor materials that can be effectively stimulated by commercial available blue light. Unfortunately, efficient phosphors in the NIR-II that can be excited by commercial blue light are particularly scarce. In this study, Mg 4 Ta 2 O 9 :0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + (MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + ) phosphor was synthesized using the high temperature solid phase method, and its emission spectrum covered the first and second near-infrared windows (700–1200 nm). The internal quantum efficiency (IQE) and external quantum efficiency (EQE) are 88.7 % and 45.6 %, respectively, due to the synergistic effect of energy transfer and Li-ion modification. Additionally, the doping of Yb 3+ ions and Li + ions enhances the thermal stability of luminescence. The thermal stability of MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + and MTO:0.04Cr 3+ ,0.03Yb 3+ is 9.81 % and 14.43 % higher, respectively, than that of MTO:0.04Cr 3+ ,0.03Yb 3+ and MTO:0.04Cr 3+ . To evaluate its potential applications, we developed a prototype PC-LED utilizing MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + phosphor as an emission emitter which demonstrated advantages in biomedical imaging, night vision, and non-destructive testing.
研究领域:
材料科学
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光学工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 24
·5186-5194
·
IF 6.569
Yan Zhang,Yanjie Liang,Shihai Miao,Dongxun Chen,Shao Yan,Jingwei Liu
A series of Cr3+-doped BaMSi3O9 (M = Zr, Sn, Hf) near-infrared emitting phosphors with tunable luminescence properties have been successfully synthesized by using a simple solid-state reaction method. The developed BaMSi3O9:Cr3+ phosphors show a broad near-infrared emission band ranging from 650 nm to 1200 nm with a peak wavelength longer than 800 nm and a full width at half maximum (FWHM) of more than 155 nm upon blue light excitation. The optimized phosphor also demonstrates good thermal stability, whose emission intensity at 150 °C can retain about 59% of its initial intensity at room temperature. The near-infrared LED prototypes constructed by combining the BaMSi3O9:Cr3+ phosphor with a blue LED chip give a maximum output power of 12.19 mW at a drive current of 320 mA. By using the fabricated near-infrared LED device as a lighting source, night-vision lighting and blood vessel imaging of human fingers and arms are successfully realized, demonstrating the great potential of BaMSi3O9:Cr3+ phosphors for near-infrared LED applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 24
·9232-9240
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IF 8.067
Hongzhen Liu,Fangyi Zhao,Hao Cai,Zhen Song,Quanlin Liu
Cr3+-activated near-infrared (NIR) materials are currently attracting extensive attention owing to emerging NIR spectroscopic applications. One promising strategy to tune the excitation and emission spectra is to modulate the compositions and local structure of the host via solid-solutions. However, the intermediate compositions generally have poorer thermal luminescence stability, limiting their practical applications. Herein, we demonstrate that intermediate compositions in pyroxene solid-solutions, (Mg1−yLiy)(Mg1−yScy)Ge2O6:4%Cr3+ (y = 0–1), are better phosphor hosts for Cr3+, possessing higher internal quantum efficiency and thermal luminescence stability. The orthorhombic pyroxene shows more efficient luminescence than the monoclinic one. Ordered occupancy of Li+ and Sc3+ ions in two octahedral sites can optimize bonding and form a more rigid structure, leading to intermediate compositions having enhanced luminescence properties. The composition with y = 0.4 shows a broadband emission centered at ∼874 nm with internal/external quantum efficiencies of 66.6%/31.5%, respectively, and a thermal quenching temperature of up to 410 K. A NIR pc-LED is fabricated to demonstrate its applications in nondestructive detection and night vision imaging. This work provides a strategy for enhancing luminescence through structural optimization.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for biochemical analysis and medical diagnosis applications; however, the development of target NIR phosphor is still a challenge. Herein, broadband NIR phosphors, Cr3+-activated CaSc1–xAl1+xSiO6 (λem = 950 nm), are designed and optimized by chemical substitution toward enhanced quantum efficiency and thermal stability. Structural and spectral analyses along with density functional theory calculations reveal that Sc3+/Al3+ substitution contributes to enhancing the structural rigidity and the local symmetry of the [Sc/AlO6] octahedron so that the nonradiative relaxation of Cr3+ emission centers is suppressed significantly. The as-fabricated phosphor-in-glass-based NIR LED light source demonstrates great potential in the detection of alcohol concentration. This study provides a local structure design principle for exploring NIR phosphors with enhanced thermal stability and will also stimulate further studies on material discovery and quantitative analysis of NIR spectroscopy.
研究领域:
材料科学
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光学工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 35
·8875-8882
·
IF 5.16
Hong Li,Qing Zhao,Bo-Mei Liu,Jun-Ying Zhang,Zhi-Yong Li,Shao-Qiang Guo,Ju-Ping Ma,Yoshihiro Kuroiwa,Chikako Moriyoshi,Li-Rong Zheng,Hong-Tao Sun
Graphical Coordination environment engineering : Layered stoichiometric BaBiO 2.5 , synthesized by nontopotactic transformation of perovskite BaBiO 3 , features an unusual electron-density distribution and Bi−O bonding situation featuring one ionic and three covalent bonds, which give rise to peculiar near-infrared luminescence never seen before in any Bi-containing system (see figure). Engineering oxygen coordination environments of cations in oxides has received intense interest thanks to the opportunities for the discovery of novel oxides with unusual properties. Herein, the synthesis of stoichiometric layered BaBiO 2.5 by a nontopotactic phase transformation of perovskite BaBiO 3 is presented. By analyzing the synchrotron X-ray diffraction data by the maximum-entropy method/Rietveld technique, it was found that Bi is involved in an unusual chemical bonding situation with four oxygen atoms featuring one ionic bond and three covalent bonds, which results in an asymmetric coordination geometry. Photophysical characterization revealed that this peculiar structure shows near-infrared luminescence differing from that of conventional Bi-containing compounds. Experimental and theoretical results led to the proposal of an excitonic nature of the luminescence. This work highlights that synthesizing materials with uncommon Bi−O bonding and Bi coordination geometry provides a pathway to the discovery of systems with new functionalities. This could inspire interest in the exploration of a range of materials containing heavier p-block elements with prospects for finding systems with unusual properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Jiangyue Su,Ran Pang,Tao Tan,Shangwei Wang,Xuexia Chen,Su Zhang,Hongjie Zhang
The near-infrared (NIR) persistent luminescence (PersL) materials have attracted widespread attention owing to the unique self-sustained light with good penetrability. Currently, most of the reported NIR PersL materials are activated by Cr 3+ . Considering the potential toxicity of chromium ions, there is an urgent requirement to explore the Cr 3+ -free NIR phosphors. Herein, a novel NIR phosphor Sr 2 LuSbO 6 :Fe 3+ (SLSO:Fe 3+ ) is prepared and its luminescence properties are systematically studied. The Fe 3+ -activated Sr 2 LuSbO 6 exhibits a long-wavelength NIR emission band centered at 890 nm with a 110 nm full-width at half maximum (FWHM), and its PersL can last over 18 h. The phosphor shows excellent PersL stability even after being dispersed in solutions of different environments for 7 days. Furthermore, the PersL emitted by the phosphor can penetrate the 2 cm thickness beef, evidencing its good NIR PersL penetration property. This work provides a novel NIR PersL materials based on Fe 3+ luminescence for technological applications and also contributes to accelerate the development of new-generation Fe 3+ -doped NIR PersL phosphor toward versatile applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICS EXPRESS
·
2025
·Vol. 33
·期 4
·8043-8054
·
IF 3.3
Mengjiao Li,Xiaoshuai Zhang,Xiaoyi Ma,Jia Li,Jie Gong,Panlai Li,Panlai Li,Xiaoyan Yu,Zixuan Wang,Chengrun Liu,Guodong Zhang,Guodong Zhang,Zhijun Wang,Zhijun Wang
To facilitate the development of near-infrared light sources for photovoltaic and night-vision lighting applications, it is crucial to obtain novel near-infrared emitting phosphors. Herein, a novel Eu2+-activated broadband near-infrared emitting phosphor CaScBO4: Eu2+ is reported. Under 558 nm light excitation, CaScBO4: Eu2+ exhibits broadband near-infrared emission centered at 780 nm with a full width at half maxima of 147 nm. The luminescence intensity is significantly enhanced by 7-fold through a cation modulation strategy using Ba2+ for Ca2+ substitution. The mechanism of the increase of the luminescence intensity is explained in detail by the change in the symmetric stretching force of the B-O bond before and after the substitution. Finally, the Ca0.85Ba0.15ScBO4: Eu2+ phosphor was encapsulated in a 558 nm chip to form a phosphor-converted light-emitting diode device, and exploratory experiments were performed to explore the applications in night vision lighting. The results show that the phosphor has great potential for application in the field of night vision lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APL Materials
·
2024
·Vol. 12
·期 9
·
IF 5.3
Shen Tiantian,Zhao Shanshan,Su An,Liu Haisheng,Chen Fayi,Li Benchun,Han Xinxin,Yu Dechao,Zhang Dawei
The Pr 3+ ion has been widely doped into various materials as a red and near-infrared (NIR) emitting center for applications in lighting and solar spectrum downconversion. Herein, the preparation of a new library of Pr 3+ -doped Sr 2 Al 2 GeO 7 phosphors was proved by powder x-ray diffraction patterns and Rietveld refinements and characterized by a scanning electron microscope with energy-dispersive x-ray spectrometry. The Sr 2 Al 2 GeO 7 :Pr 3+ sample strongly absorbs blue photons over 420–500 nm and yields intense visible emissions with dominant peaks around 490 nm from the Pr 3+ 3 P 0 → 3 H 4 transition, as well as robust NIR emission bands over 800–1200 nm. In addition to the typical transitions of 1 D 2 → 3 F 2 at 880 nm, 1 G 4 → 3 H 4 at 1000 nm, and 1 D 2 → 3 F 3,4 at 1070 nm, the distinguishable NIR emission at 929 nm was demonstrated from the 3 P 0 → 1 G 4 transition via static and dynamic spectroscopic analysis. Most interestingly, for the 3 P 0 blue-excited state, a considerably elevated concentration of about 10%Pr 3+ was optimal for the visible/NIR emissions, in stark contrast to the diluted optimal 1%Pr 3+ for the 1 D 2 state. The relevant cross-relaxation from the 3 P 0 and 1 D 2 states between Pr 3+ was comprehensively treated by theoretical speculations and experimental results. Such concentrated Pr 3+ blue activators would significantly facilitate the blue-to-NIR downconversion through a desired two-step sequential transition from the 3 P 0 initial state to the 1 G 4 intermediate level for quantum efficiency exceeding unity. The current results would consolidate the basis of concentrated Pr 3+ donors to promote the novel Pr 3+ /Yb 3+ codoping downconversion for greatly increasing Si solar cell efficiency.
研究领域:
材料科学
·
光学
✓ 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）