CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongxiang Shao,Xianju Zhou,Faling Ling,Li Li,Yongjie Wang,Jingfang Li,Ruiheng Pan,Hongmei Yang,Guangxin Xie
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have become important as new NIR light sources in NIR spectroscopy and NIR imaging techniques . However, currently developed broadband NIR phosphors commonly suffer from weak emission and poor thermal stability. In this work, a series of Gd 3 Lu 2 Ga 3 O 12 : Cr 3+ phosphors were synthesized via high-temperature solid-state reaction. Under 460 nm excitation, the phosphors exhibit an intense emission spanning from 650 to 1150 nm with a full width at half maximum (FWHM) of 122 nm. After introducing Yb 3+ as a co-dopant, the emission of the phosphor has been broadened greatly. Interestingly, the studied phosphors demonstrate super high thermal stability in a wide temperature range of 35–560 K, with the integrated emission intensity fluctuating within 10 %. At 435 K, the emission intensity of Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ remains 99.5 % and Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ , 0.01 Yb 3+ keeps 102.7 % of the initial intensity at room temperature. These NIR phosphors have been encapsulated with a common commercial 460 nm blue LED chip to fabricate a pc-LED device. The NIR output power of the device reaches 23.93 mW@100 mA, with a photoelectric conversion efficiency of 9.81 % at 20 mA current. The applications of the prepared NIR light source in night vision, and bioimaging have been demonstrated. The results show that these Cr 3+ /Yb 3+ doped garnet phosphors can be effectively used in NIR light sources .
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Fengxia Zou,Ming Li,Zengyan Du,Yi Song,Liang Li,Guanghai Li
In modern agriculture, light plays an important role in plant growth. Far red light controls the whole growth process of plants from germination to vegetative growth to flowering. Here, we report the preparation and photoluminescence (PL) performance of Cr,Bi co-doped SrGdAlO 4 phosphors by solution combustion method. The SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors exhibit far red broadband PL of 660–780 nm excited at 458 nm, and the maximum emission peak position is at 713 nm. It was found Cr 3+ and Bi 3+ replaced the positions of Al 3+ and Gd 3+ in the host material, respectively. The PL performance of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors mainly depends on the 2 E 2 → 4 A 2 transition of Cr 3+ , and the addition of Bi 3+ can effectively enhance the PL intensity of the phosphors. Notably, the SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors also exhibit obvious far red PL when coated onto glass substrate or mixed with plastics without affecting their visible light transmission. We believe our work will excite interests in further exploring the practical application of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors as plant growth regulator in greenhouse.
研究领域:
农业科学
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材料科学
·
植物生物学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Rongbo Ma,Tingting Zhang,Bin Cao,Xinyong Gong,Chaoyong Deng,Weichao Huang
The structural, optical and temperature-dependent luminescence properties of Y2Mg2Al2Si2O12:Cr3+ phosphors are investigated for their multifunctional applications. The as-prepared phosphors exhibited an intense far-red emission band around 600-850 nm with a peak at 687 nm, which matches well with the absorption band of plant phytochromes. Importantly, the optimized sample showed excellent thermal stability and the emission intensity at 423 K maintained about 77% of that at 298 K. The potential application of the phosphor in plant growth LED devices was also demonstrated. Furthermore, due to the unique thermal quenching behavior of Cr3+, a three-mode luminescent thermometry was designed based on the fluorescent intensity (FL), fluorescent intensity ratio (FIR), and full width at half maximum (FWHM) method. The maximum temperature relative sensitivity (Sr) of each mode can reach 2.74% K−1, 1.09% K−1, 1.47% K−1, respectively. These results indicate that the Y2Mg2Al2Si2O12:Cr3+ phosphors can address applications in plant growth and optical thermometry.
研究领域:
材料科学
·
植物学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
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
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhaoqi Liu,Yuan Tang,Xiaohong Zhang,Nian Pan,Haiyan Shi,Pengbo Lyu,Changfu Xu,Lizhong Sun
Double-perovskites materials are suitable matrices for hosting Cr 3+ ions to achieve highly efficient near-infrared (NIR) luminescence. In this study, the Sr 2 AlNbO 6 : x Cr 3+ (SANO:0.15 % Cr 3+ ) phosphors were synthesized by doping Cr 3+ ions into the double perovskite Sr 2 AlNbO 6 (SANO) using a high-temperature solid-state method. The substitutional preferences of Cr 3+ ions in the lattice were systematically investigated, considering variations in ionic radius, crystal field strength, and energy transfer dynamics. The optimal SANO:0.15 % Cr 3+ phosphor exhibited narrowband NIR emission centered at 760 nm (700–900 nm) under 323 nm excitation, with distinct phonon sidebands. The strong crystal field environment was evidenced by a Dq / B value of 2.66. The phosphor demonstrated outstanding performance, including an internal quantum efficiency of 66.1 %, absorption efficiency of 43.0 %, and external quantum efficiency of 28.4 %. Additionally, it exhibited excellent thermal stability, retaining 52 % of its room-temperature emission intensity at 423 K. When incorporated into an NIR pc-LED device with a 310 nm chip, the phosphor enabled clear imaging of objects in dark environments using an NIR camera. These results underscore the potential of SANO:0.15 % Cr 3+ phosphors for night-vision illumination and next-generation NIR technologies.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibang Liu,Gaoliang Wang,Liuyang Xu,Huanxia Jia,Xianke Sun,Honglei Yuan
NIR phosphor-converted light emitting diodes possess extensive application in a variety of occasions. And the exploration of NIR phosphors having outstanding quantum yield and thermostability is still a challenge. In this work, the layered structure and broadband GaTa 0.5 Nb 0.5 O 4 :Cr 3+ phosphors owning excellent performance were synthesized. The GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor provides a quantum yield of 92.2%, as well as an activation energy of 0.329. The NIR pc-LED formed via the combination of GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor and blue LED chip owns an output power of 4.56 mW and a photoelectric conversion efficiency of 9.37% when driven at 20 mA, and the output power increases to be 44.6 mW and the photoelectric conversion efficiency changes to be 7.19% when driven at 250 mA. The results of this work demonstrated that the Cr 3+ activated GaTa 0.5 Nb 0.5 O 4 phosphors may be a prospective candidate for NIR phosphor-converted light emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2010685
·
IF 18.808
Puxian Xiong,Bolong Huang,Dengfeng Peng,Bruno Viana,Mingying Peng,Zhijun Ma
Currently, most of the mechanoluminescence (ML) phosphors strongly depend on postirradiation stimulation using ultraviolet light (denoted as “UV exposure” from hereon) to show the ML. However, only a few transition metal cations are proven to be effective luminescence centers, which hinder the development of more ML phosphors. This study reports a self-recoverable deep-red-to-near-infrared ML using Cr 3+ -doped LiGa 5 O 8 phosphor with fully recoverable ML performance. The ML performance can be further optimized by tuning the trap redistributions by codoping the phosphor with Al 3+ and Cr 3+ cations. Theoretical calculations reveal the important role of Cr dopants in the modulation of local electronic environments for achieving the ML. Owing to the induced interelectronic levels and shallow electron trap distributions, the electron recombination efficiency is enhanced both through direct tunneling and energy transfer toward the dopant levels. Moreover, the ML of Cr 3+ -doped LiGa 5 O 8 can penetrate a 2-mm-thick pork slice, showing that it can have wide-ranging in vivo applications, including the optical imaging of intracorporal stress/strain distribution and dynamics. Therefore, this work fabricates a novel ML material with self-recoverable luminescence in an extended wavelength range, increasing the number of potential ML candidates and promoting the fundamental understanding and practical applications of ML materials.
研究领域:
材料科学
·
生物医学工程
·
光学成像
·
分子探针
·
转化医学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 12
·3621-3628
·
IF 5.934
Fangyi Zhao,Zhen Song,Jing Zhao,Quanlin Liu
Searching for high performance and broader applications of inorganic halide perovskites has drawn extensive attention. In this work, a Cr3+-doped halide perovskite, Cs2AgInCl6:Cr3+, which exhibits broadband near-infrared (NIR) emission is first obtained via the traditional high temperature solid-state reaction. A broad emission band ranging from 850 to 1350 nm centered at 1010 nm with a full-width at half-maximum (FWHM) of 180 nm is assigned to the spin-allowed 4T2 → 4A2 transition of octahedrally coordinated Cr3+ ions in a very weak crystal-field environment. The excitation bands centered at 353, 565 and 800 nm can be attributed to the absorption of the Cs2AgInCl6 host, the Cr3+ d–d transitions of 4A2 → 4T1 and 4A2 → 4T2, respectively. Upon 760 nm excitation, the photoluminescence quantum yield (PLQY) of Cs2AgIn0.9Cl6:0.1Cr3+ is about ∼22.03%. Cs2AgInCl6:Cr3+ phosphors with such broadband NIR emission have potential in phosphor converted light emitting diodes (pc-LEDs) which have applications in bioimaging and biomonitoring.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
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
·
光学工程
·
生物医学工程
✓ 已验证
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
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Kang Cheng,Xinyue Liu,Rongbo Ma,Bin Li,Chong Yang,Xinyong Gong,Weichao Huang
Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors were successfully synthesized by the high-temperature solid-state reaction method. Cr 3+ , Mn 4+ co-doped Li 2 MgTiO 4 phosphors have two emission peaks at 674 nm and 719 nm, corresponding to 2 E→ 4 A 2 transitions of Mn 4+ and 2 E→ 4 A 2 transitions of Cr 3+ , respectively. The two emission peaks are matched with the absorption of P R and P FR , and the intensity ratio of the two emission peaks is adjusted by changing the doping concentration of Mn 4+ , indicating that the phosphors have potential applications in plant cultivation. In addition, it can be observed that the emission peak corresponding to Mn 4+ can decrease sharply with the increase of excitation wavelength, while the emission peak corresponding to Cr 3+ can change little, which indicates that the phosphors can be used for wavelength detection. The security ink prepared by Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors shows that it can be applied in anti-counterfeiting labels. These results suggest that Li 2 MgTiO 4 :Cr 3+ , Mn 4+ have the great potentiality to be used for plant cultivation, wavelength detection and anti-counterfeiting.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2197-2205
·
IF 7
Siyu Guo,Ligan Ma,Muniran Abudureyimu,Rongfei Wei,Fumin Lu,Fangfang Hu,Hai Guo
Near-infrared (NIR) spectroscopy has garnered substantial attention owing to its diverse merits and widespread applications. Meanwhile developing phosphors with broadband and efficient NIR emission is still an enormous challenge for constructing NIR light sources. Herein, enhanced and broadened NIR luminescence of Gd2−xAlxGaSbO7 (G2−xAxGSO):y%Cr3+ phosphors can be realized via modifying the crystal field environment of Cr3+ induced by Al3+ → Gd3+ cation substitution. Upon blue light irradiation, G1.4A0.6GSO:4%Cr3+ exhibits a broadband luminescence ranging from 650 to 1000 nm with a full width at half maximum (FWHM) of 136 nm, excellent thermal stability, and a tiny chromaticity shift. Through incorporating the resulting powders into a blue light-emitting diode (LED) chip, a NIR phosphor-converted (pc) LED with a high output power of 62.99 mW and a photoelectric conversion efficiency of 13.38% was manufactured. The fabricated pc-LED shows application potential in nondestructive food analysis. These findings confirm that the as-synthesized G2−xAxGSO:Cr3+ phosphor is a promising candidate for application in NIR pc-LEDs.
研究领域:
材料科学
·
光学工程
✓ 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）