Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7611-7618
·
IF 6.4
Xiaoxuan Guo,Bomei Liu,Rongyi Kuang,Weijiang Gan,Lin Huang,Jing Wang
Cr-activated phosphor-converted light sources have attracted widespread attention in various applications based on near-infrared (NIR) spectroscopy. Unfortunately, Cr ions usually face the issue of multivalence and typically exist in the valence of +3, which gives the emission mainly at NIR-I (700–1000 nm) and greatly limits its potential application. In this study, we propose the control strategies of site occupancy confinement and sintering atmosphere to synthesize Cr4+-activated Li2SrGeO4 (LSGO:Cr4+) phosphors. Interestingly, the as-optimized LSGO:Cr4+ achieves a NIR broadband emission peak at 1170 nm with an FWHM of 208 nm upon excitation at 680 nm and exhibits excellent thermal stability and high efficiency with the external quantum efficiency of 30.0%. Furthermore, the as-fabricated LSGO:Cr NIR phosphor-converted light emitting diode (NIR pc-LED) device shows a high power of up to 69.1 mW at 550 mA. Furthermore, as NIR-II (1000–1700 nm) light source, the phosphor successfully distinguishes deuterium and non-deuterium reagents. For example, the quantitative detection of H2O in heavy water (D2O) is demonstrated by NIR spectroscopy with a limit of detection (LOD) of 0.47 vol%. Our findings will open up a new avenue to develop novel Cr4+-activated NIR-II phosphors and NIR-II light sources.
研究领域:
材料科学
·
光学工程
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
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
·
生物医学工程
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Changfu Xu,Yan Yuan,Haiyan Shi,Minchun Lin,Yuan Tang,Zhaoqi Liu,Nian Pan,Xiaohong Zhang,Pengbo Lyu,Lizhong Sun
Capturing both structural and pigmented iris textures is essential for accurate identity authentication and medical testing, particularly for heavily pigmented irises. Traditional near-infrared (NIR) lighting captures only structural details, while multiwavelength LEDs capture both but hinder device miniaturization. We present a solution using a phosphor-converted LED (pc-LED) that emits both visible and NIR light, combining commercial CaAlSiN3:Eu2+ and Ca3LuAlGe3O12:Cr3+ phosphors. This compact lighting source improves the emission efficiency and thermal stability through Lu3+ substitution with Al3+, allowing for the capture of clear iris images that reveal both structural and pigmented textures. Our results highlight the potential of visible and NIR pc-LEDs to enhance iris biometrics for portable devices and reduce the cost of iris medical testing equipment.
研究领域:
光学工程
·
生物识别技术
·
医学成像
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2022
·
IF 6.814
Zhi Zhou,Shuqing Feng,Shujie Gai,Peixin Gao,Chen Xu,Mao Xia,Wenbang Tang,Xuedan Lu
Industrial Seedling Raising (ISR) is increasingly becoming an important part of Modern Agriculture because of its efficient utilization of land, water, and fertilizer as well as its advantages of being not easily affected by the weather. However, the high cost and high energy consumption of light sources for plant growth is limiting the popularization of ISR technology. Phosphor-converted light-emitting diodes (pc-LEDs) make use of relatively affordable red phosphor and blue light chips, providing an adjustable spectrum to optimize plant growth. To identify the energy-saving light quality of pc-LEDs, we investigated the effects of a variety of light qualities on the growth of tobacco seedlings. Y 3 Al 5 O 12 :Ce 3+ , CaAlSiN 3 :Eu 2+ , KAl 11 O 17 :Eu 2+ phosphors were combined with the blue light chip according to different proportions to produce the following light sources: CK (white light), T1 (blue light), T2 (red light), T3 (red: blue light ratio = 1:4), T4 (red: blue light ratio = 4:1). The tobacco variety Xiangyan7 grown continuously under T1, T2, T3, and T4 significantly increased the leaf area, stem length, biomass, root area and main root length compared with those grown under white light. Among the five kinds of light qualities tested, T4 treatment exerted the best effect on leaf development and biomass increase, while T2 exerted the best effect on stem elongation . The cytological analysis demonstrated that the promotion of the cell size and cell number of leaf epidermal cells by T1-T4 might contribute to the leaf expansion. Further analysis at the molecular level suggested that the light quality affected the RNA levels of the genes involved in cell division and expansion. When tobacco seedlings reached the same biomass, T1-T4 light sources saved 71%, 86%, 80% and 89% of electric energy respectively compared with white light. Therefore, the application of specific pc-LEDs not only reduces the cost of light source production, but also saves energy consumption, offering great potential for ISR technology to cut costs and increase efficiency.
研究领域:
农业
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植物生理学
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照明技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 20
·10390-10398
·
IF 5.1
Yi Xu,Xuewan Lin,Jiyou Zhong
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have emerged as ideal light sources for a variety of advanced spectroscopy applications, demonstrating the importance of developing efficient NIR phosphors. In this work, a Ti4+-containing garnet, Na2CaTi2Ge3O12, was selected as the host material to minimize the ionic size mismatch after Cr3+ substitution. Interestingly, this substitution generates charge self-balance, enabling excellent efficiency of the developed material. Under 465 nm excitation, it exhibits broadband emission covering the first NIR window (λem,max = 790 nm) with a full width at half maximum (FWHM) of 120 nm. The optimized sample achieved a photoluminescence quantum yield (PLQY) of 75%. Moreover, a NIR pc-LED device was fabricated by combining the optimized phosphor with a blue (λem = 455 nm) InGaN chip. Upon application of a driving current of 100 mA, the device demonstrated a NIR output power of 18.24 mW and a corresponding NIR photoelectronic conversion efficiency of 6.49% and exhibited excellent performance in biological tissue imaging and non-destructive testing. Therefore, this work provides an efficient NIR phosphor, which has promising potential in spectroscopy applications.
研究领域:
材料科学
·
光学
·
生物医学工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302380
·
IF 9
Xiangyi Dai,Xikun Zou,Haoran Zhang,Weibin Chen,Chaowei Yang,Maxim S. Molokeev,Zhiguo Xia,Yingliang Liu,Xuejie Zhang,Mingtao Zheng,Bingfu Lei
Cr 3+ -doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr 3+ -doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr 3+ -doped phosphor Ca 2 YAl 3 Ge 2 O 12 :Cr 3+ (CYAG:Cr 3+ ), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr 3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr 3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr 3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr 3+ -doped plant-lighting phosphors.
研究领域:
材料科学
·
农业与植物学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chaowei Yang,Dongwei Zheng,Xikun Zou,Xiangyi Dai,Baoling Tang,Maxim S. Molokeev,Xuejie Zhang,Haoran Zhang,Yingliang Liu,Bingfu Lei
Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr 3+ -doped FR phosphors. This study developed a FR phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr 3+ (CMAGG: Cr 3+ ), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (P fr ), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr 3+ -doped FR phosphors to meet the precise spectral requirements for plant growth.
研究领域:
植物学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Wei Wan,Man Li,Jingyan Jiang,Yifei Zhao,Yayun Zhou
Broadband near-infrared (NIR) light sources have emerged as crucial components in a wide array of technological applications, spanning from advanced imaging systems to night vision devices and healthcare therapy. The advent of light-emitting diodes (LEDs) has unlocked new opportunities for broadband NIR phosphor-converted LEDs (NIR pc-LEDs), characterized by improved efficiency, compact form factors, and low operating temperatures. However, high-performance NIR phosphors for high-power LEDs remain scarce. In this work, Cr 3+ -doped fluorides BaSiF 6 : x Cr 3+ (where x ranges from 2.5% to 15%) have been designed and synthesized, which offer high quantum efficiency and thermal stability to maintain ∼80% intensity at 450 K. Theoretical simulations demonstrate that BaSiF 6 , with a sufficiently large electronic bandgap of 7.8 eV, possesses the full potential to host NIR luminescent activators. Furthermore, molecular dynamics (MD) simulations validate its good thermal stability, enduring high temperatures exceeding 600 K annealing. The fabricated NIR pc-LED device using BaSiF 6 :Cr 3+ demonstrates high light output power and photoelectric efficiency under multiple driven currents, making it suitable for a wide range of applications as NIR light source. Capitalizing on the above merits, a prototype NIR transmission detector is demonstrated for potential applications in material inspection, medical diagnostics, and security systems. This research expands the repertoire of high-performance NIR phosphors for multifunctional use.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18234-18240
·
IF 8.067
Chuan-Jun Tang,Bo-Mei Liu,Lin Huang,Jing Wang,Qiang Tang
The rapid development of minimized near-infrared (NIR) phosphor-converted LEDs (pc-LEDs) has evoked a large demand for broadband NIR phosphors and will enable breakthrough NIR spectroscopy applications. Consequently, the search for NIR pc-LEDs which can emit in the NIR-II window (1000–1700 nm) has become increasingly urgent. Herein, an unprecedented long-wavelength NIR MgTi2O5:Ni2+ phosphor that exhibits broadband NIR emission covering 1200 to 1700 nm with a full width at half maximum (FWHM) of 245 nm is successfully synthesized. By combining the MgTi2O5:Ni2+ phosphor with an ultraviolet LED chip, a high-performance NIR pc-LED is fabricated, which has a NIR output power of 3.6 mW at 300 mA driving current. These results indicate that the fabricated NIR-II pc-LED device is a promising candidate as a broadband light source for NIR spectroscopy applications including night vision, high-penetrating imaging, and information restoration. For instance, the secret information covered by ink can be recovered with the aid of an NIR-II pc-LED. This work not only provides a new material that has great potential as a NIR light source, but also demonstrates a set of approaches to expand the application of NIR spectroscopy and imaging technology.
研究领域:
材料科学
·
光学工程
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jianjun Song,Haoyi Wu,Xiaoqi Liu,Shuyu Qin,Haoquan Li,Yahong Jin,Yihua Hu
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered widespread research interest. The development of broadband NIR phosphors remains hindered by significant challenges, restricting their potential applications. In this work, a novel broadband NIR emitting CaHf 4 (PO 4 ) 6 : Cr 3+ (CHPO: Cr 3+ ) phosphor was synthesized. Under 472 nm excitation, the phosphor demonstrated a broadband emission centered at 925 nm with a full width at half maximum (FWHM) of 181 nm. The emission spectrum effectively encompassed the third-order frequency-doubling absorption band of C-H bonds and the second-order frequency-doubling absorption band of O-H bonds. A pc-LED was fabricated by combining CHPO: Cr 3+ phosphor with a 470 nm blue LED chip, achieving a near-infrared output power of 25.5 mW and an impressive photoelectric conversion efficiency of 6.4 % at a driving current of 120 mA. Finally, studies on night-vision, non-destructive testing, and solution concentration detection demonstrate the potential of the synthesized NIR phosphor for advancing broadband NIR pc-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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mingjun Zhao,Chongyun Shao,Weichang Li,Danping Chen,Wei Chen
A novel strategy for effectively enhancing the near-infrared (NIR) broadband luminescence of Fe 3+ by modifying the symmetry of the Fe 3+ coordination field is developed and evaluated. The borate glass doped with F (fluorine) or S (sulfur) prepared in a reducing atmosphere exhibits broadband NIR luminescence in the 500–1150 nm wavelength range under approximately 360 nm near-ultraviolet (NUV) excitation. The emission peak wavelength is about 740 nm, with a full-width at half maximum (FWHM) of 225 nm and an average lifetime of several hundred microseconds. Combining photoluminescence (PL), absorption (Abs), and electron paramagnetic resonance (EPR) spectroscopy, we proposed that this NIR emission originates from the tetrahedral impurity Fe 3+ coordinated with F − or S 2− in the glass. The presence of F and S alters the symmetry of the local coordination of Fe 3+ centers, resulting in increased splitting of the d-electrons, hence, enhancing the luminescence of the d→d transition. In addition, an NIR gc-LED device is developed by coupling NIR fluorescent glass with a 365 nm commercial near-ultraviolet light-emitting diode (LED). This NIR gc-LED device can be utilized for nondestructive internal detection, nondestructive imaging of blood vessels in the human finger, and night vision. The transparent glass developed in this work is an excellent addition to the group of novel NIR materials and displays significant potential for NIR luminescence applications.
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
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 3
·2300608
·
IF 11
Ruiyang Li,Yongfu Liu,Chen Jin,Liangliang Zhang,Jiahua Zhang,Xiao-Jun Wang,Guoxin Chen,Jun Jiang
Near-infrared (NIR) phosphor-converted (pc) light-emitting diodes (LEDs) are gaining popularity as smart NIR spectroscopy light sources. However, the low wall-plug efficiency (WPE) of NIR pc-LEDs has limited their applications due to the comprehensive properties of external quantum efficiencies (EQEs) and thermal stability for NIR phosphors. In this study, a simple strategy is presented to achieve high-performance NIR phosphors by breaking the d–d parity forbidden transitions of Cr 3+ in the garnet host by introducing asymmetric vibrations via lattice distortions. The achieved EQE is as high as 44% at room temperature and maintains >98% of the initial EQE at 150 °C, demonstrating excellent thermal stability. Notably, these NIR phosphors enable unprecedented NIR pc-LEDs with a record WPE of 26% driven at 100 mA. Consequently, the application of NIR pc-LEDs is expanded to new areas such as real-time heart rate monitoring and fingerprint recognition.
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
危险品化学品经营许可证（带存储）