CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Zurong Liao,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Materials emitting near-infrared (NIR) light play a crucial role in the development of phosphor-converted light-emitting diodes (pc-LEDs) for applications ranging from fundamental science like spectroscopic analysis to highly applied uses like night vision and biological imaging. One class of materials that has garnered significant interest for these technical spaces is Cr3+-activated garnets due to their high efficiency and ability to operate at relatively high temperatures. However, their limited emission beyond 800 nm impedes their use as optimal blue LED-pumped NIR-emitting materials. In this study, we present a new garnet-type NIR phosphor, Na2CaZr2Ge3O12:Cr3+, that addresses this challenge─the material exhibits a long-wavelength emission (λem,max = 832 nm) and good thermal quenching resistance while maintaining an excellent internal quantum efficiency (IQE = 98%). These properties are attributed to a crystal environment reconstruction, where a crystal structure distortion is coupled to a weak crystal field, which is uncommon for most rigid garnet-type phosphors. Furthermore, the fabricated NIR pc-LED devices using this material demonstrate superior performance compared with devices employing well-known efficient NIR phosphors operating in this emission range. The light source is subsequently demonstrated in applications spanning night vision, bioimaging, and nondestructive analysis. This study not only provides insights into the luminescence properties of Cr3+-activated garnet materials with desirable performance but also highlights the practical application of NIR-emitting garnet phosphors.
研究领域:
材料科学
·
光子学
·
光电技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanfei Zou,Chen Hu,Shoukun Lv,Yimeng Shao,Bing Teng,Fei You,Hui Xu,Degao Zhong
As a key material for phosphor-converted light-emitting diodes (pc-LEDs) applications, broadband near-infrared (NIR) phosphors currently face poor thermal stability issues. In this work, we synthesized a broadband near-infrared phosphor YGa3(BO3)4: Cr3+ (YGBO: Cr3+) with a high thermal stability. The YGBO: Cr3+ sample exhibits a broadband near-infrared emission centered at 770 nm with a full width at half-maximum (fwhm) of 2130 cm–1 under blue light excitation. Benefiting from the borate host crystal’s strong structural rigidity, wide optical band gap, and weak electron–phonon coupling strength, YGBO: Cr3+ demonstrates strong luminescence thermal stability, and the corresponding luminescence intensity can maintain 80% at 150 °C compared to room temperature. Furthermore, we fabricated a pc-LED device using a blue light chip and YGBO: Cr3+ phosphor, and confirmed its application potential as a near-infrared light source in the spectral analysis of fruit freshness.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lanjiao Li,Ying Chen,Rongfei Wei,Siyu Guo,Xiangling Tian,Fangfang Hu,Hai Guo
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are playing an increasingly important role in the spectroscopy technology fields. Developing high-performance NIR-emitting phosphors is of immense significance for advancing NIR pc-LEDs. Herein, the approach of cationic substitution of Ca 2+ by Mg 2+ was designed in Ca 4 ZrGe 3 O 12 :Cr 3+ . Remarkably enhanced NIR emission and strikingly improved thermal stability are realized. The luminescence intensity at 423 K compared with that of room temperature ascends from 45.67 % to 72.81 %. Moreover, the representative sample was assembled to a NIR pc-LED with favorable output power and photoelectric conversion efficiency by combining a commercial 470 nm blue chip. The packaged LED demonstrates the feasibility of practical applications in night vision, biological imaging, and fruit detection. The above findings verify the potential prospect of Ca 4- x Mg x ZrGe 3 O 12 :Cr 3+ phosphor for the utilizations in NIR light sources.
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
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yi Zhang,Zhexuan Gao,Yingguang Li,Shuyang Chen,Mingxiao Han,Jie Li,Qihao Zhang,Yang Shen,Degang Deng,Shiqing Xu
The La2LiSbO6: xCr3+ phosphors were synthesized by means of a high-temperature solid-phase method. Based on the differences in ionic radius, valence state, and formation energy, the substitution sites of Cr3+ ions are discussed in detail. The optimized doping concentration of Cr3+ is determined to be 0.01. Under 517 nm excitation, the La2LiSbO6: 0.01Cr3+ phosphor presents a wide emission band (from 700 to 1350 nm) with a peak centered at 952 nm. Additionally, its corresponding full width at half-maximum is 155 nm, and the internal quantum efficiency reaches 62.4%. Meanwhile, the emission intensity of the La2LiSbO6: 0.01Cr3+ phosphor at 373 K is about 63.7% of that at room temperature, exhibiting good thermal stability. Aiming to fabricate a near-infrared phosphor-converted light-emitting diode device, the La2LiSbO6: 0.01Cr3+ phosphor is mixed with epoxy adhesive and cured on a green light-emitting diode chip. Under the irradiation of the fabricated light-emitting diode device, fruits and writing in the dark environment can be captured by a near-infrared camera. Hence, the La2LiSbO6: 0.01Cr3+ phosphor is promising for night vision.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
✓ 已验证
DOI
高影响因子
Communications Materials
·
2026
·
IF 9.1
Li Qinghua,Gao Tianfu,Rao Xinhao,Ren Zhelei,Duan Haodi,Xie Xiaomin,Liao Jiaxin,Xue Shuwen,Xu Bin,Jin Xiao,Zhao Weifeng,Bai Jinke
Translating advanced luminescent materials into field-deployable screening tools remains a core challenge, demanding synergy between advanced optical materials and device engineering. Here, we demonstrate a portable dual-mode near-infrared semi-quantitative screening device. the luminescence performance of the core emitting materials, specifically lead-free Nd³⁺/Yb³⁺ co-doped Cs₂NaYCl₆ double perovskite phosphors, was first optimized through a machine-learning (ML) guided approach. Subsequently, these optimized phosphors were integrated to enable the device. Specifically, the Nd³⁺-doped emitter targets the 885 nm characteristic absorption band of alcohol while exhibiting anomalous thermal quenching, whereas the Nd³⁺/Yb³⁺ variant leverages 78.66% energy transfer efficiency to yield stable 985 nm emission (70% retention at 500 K) matching the characteristic absorption band of water. These optimized phosphor-converted LEDs were integrated into a compact detector featuring a coaxial dual-disc stepper mechanism and a customized three-stage circuit that amplifies faint optical signals into a five-level visual indicator. This configuration enables rapid screening of alcohol (30–60%) and water content (45–100%). Validated on commercial samples, this work establishes a holistic platform bridging high-precision instrumentation and real-world portability.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hangzhang Kou,Fanlei Qin,Jianfeng Wang,Esmaeil Heydari,Gongxun Bai
Near-infrared (NIR) wireless communication has been widely investigated because of its fast transmission speed and good penetration barrier performance. Despite their promising characteristics, the implementation of these materials is substantially limited by thermal degradation effects. To address this challenge, we developed Cr3+-activated gadolinium gallate phosphors that exhibit an emission bandwidth of 92.8 nm at half-maximum intensity while maintaining 86.3% of the initial luminous intensity at 150 °C. Furthermore, phosphor-converted light-emitting diodes (pc-LEDs) were manufactured, attaining a 1060 mW NIR output power and 360 mA current. The device was used to test the signal transmission effect using the prepared NIR pc-LEDs as the light source. In the case of input sine wave, inverse sine wave, and triangle wave, the transmission of the waveform was realized, and its penetration performance was tested. The experimental findings demonstrate that the proposed material exhibits promising applications in NIR optical communication systems.
研究领域:
材料科学
·
光学通信
·
固态照明
·
光子学
·
半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shaoxuan He,Panlai Li,Yinti Ren,Guohui Wei,Ye Wang,Yuanbo Yang,Rui Li,Jiehong Li,Yawei Shi,Xingqiang Shi,Zhijun Wang
Broadband near-infrared (NIR) phosphors are necessary materials for developing portable NIR light sources. Moreover, exploiting an NIR phosphor with a main peak located beyond a wavelength of 900 nm remains a challenge because this spectral range has great potential in biological nondestructive testing and solution testing. In this study, a range of Cr3+-doped ZnTa2O6 (ZTO) phosphors were completely synthesized by a solid-state method, which show broadband Cr3+ emission centered at 935 nm with a large full width at half maximum (FWHM) of 185 nm due to two distorted octahedral sites. A packaged phosphor-converted light-emitting diode (pc-LED) device is used to penetrate a 5-cm-thick chicken breast and identify diverse solutions based on differences in the measured transmission spectra. The results indicate broad application prospects in the field of biological tissue penetration and solution analysis.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态照明
·
生物医学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 14
·6377-6385
·
IF 3.5
Chengping Fang,Shuoheng Wang,Shuai Wei,Qingxian Xu,Zeyu Lyu,Sida Shen,Taixing Tan,Hongpeng You
NIR luminescent materials have garnered widespread attention because of their exceptional properties, with high tissue penetration, low absorption and high signal-to-noise ratio in the field of optical imaging. However, producing nanophosphors with high quantum yields of emitting infrared light with wavelengths above 1000 nm remains a significant challenge. Here, we prepared a nanoscale ZnGa2O4:xCr3+,yNi2+ phosphor with good luminescence performance in near-infrared emission, which was synthesized via a hydrothermal method and subsequent calcination process. By co-doping with Cr3+ and Ni2+, the ZnGa2O4 phosphor shows a strong broadband emission of 1100–1600 nm in the second near-infrared (NIR-II) region, owing to the energy transfer from Cr3+ to Ni2+ with an efficiency up to 90%. Meanwhile, a near-infrared phosphor-conversion LED (NIR pc-LED) device is fabricated based on the ZnGa2O4:0.8%Cr3+,0.4%Ni2+ nanophosphor, which has under 100 mA input current, an output power of 23.99 mW, and a photoelectric conversion efficiency of 7.53%, and can be effectively applied in imaging and non-destructive testing. Additionally, the intensity ratio of INi/ICr of ZnGa2O4:0.8% Cr3+,0.4%Ni2+ with its high sensitivity value of 4.21% K−1 at 453 K under 410 nm excitation, indicates its potential for thermometry application.
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
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 47
·23612-23619
·
IF 5.1
Wenqiang Li,Qihao Li,Yuehua Chen,Cailing Liu,Wenjing Zhong,Xiang Zhang,Yayun Zhou,Tingting Deng,Jiantao Lü,Ting Fan
Near-infrared phosphor-converted light-emitting diodes (pc-LEDs), as the core light source for smart broadband near-infrared spectroscopy, face critical challenges in balancing luminous efficiency and thermal stability. Herein, we report a Cr3+-doped fluoride phosphor AlF3:Cr3+ with efficient broadband near-infrared (NIR) emission. Under blue-light excitation, AlF3:Cr3+ exhibits a broadband NIR emission centered at 749 nm with a full width at half maximum (FWHM) of 87 nm. Notably, it shows excellent thermal stability, retaining 86.28% of its room-temperature luminescence intensity at 423 K (150 °C). This superior anti-thermal quenching property is attributed to the weak electron–phonon coupling in its crystal structure, characterized by a low Huang–Rhys factor (S = 2.15). By integrating this phosphor with a blue LED chip, we fabricated a NIR pc-LED device with a photoelectric conversion efficiency of 2.2%@20 mA. The device would demonstrate significant advantages in diverse fields, including nondestructive testing, biomedical imaging, and intelligent security, highlighting the great potential of AlF3:Cr3+ for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ziyang Wu,Jinmeng Xiang,Changheng Chen,Zexun Li,Xianju Zhou,Yuehui Jin,Chongfeng Guo
As a new generation of near-infrared (NIR) light source, phosphor-converted NIR light emitting diodes (NIR pc-LEDs) have broad application prospects in biological tissue imaging, night vision and chemical composition analysis . However, most NIR emitting phosphors are still limited to short-wavelength, narrow-band emission and low efficiency. Here, based on the multi-site occupation strategy, the NIR phosphor Mg 2 LaTaO 6 :Cr 3+ (MLT:Cr 3+ ) achieves an efficient broadband NIR emission with the full width at half maximum (FWHM) of 203 nm in the range of 600–1300 nm under the excitation of 468 nm blue light. The phosphor MLT:0.01Cr 3+ not only exhibits an excellent internal quantum efficiency (IQE) of 85.6 %, but also has good thermal stability and remains about 64.2 % photoluminescence (PL) intensity of room temperature at 423 K. Furthermore, the MLT:0.01Cr 3+ phosphor was combined with a blue LED chip to fabricate the NIR pc-LED device, and its potential applications were successfully realized in information encryption, bioimaging and the qualitative or quantitative analysis of mixture of ethanol and water.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Geng Chen,Yahong Jin,Lifang Yuan,Bo Wang,Jiansheng Huo,Hao Suo,Haoyi Wu,Yihua Hu,Feng Wang
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) hold promising potential as next-generation compact, portable, and intelligent NIR light sources. Nonetheless, the lack of high-performance broadband NIR phosphors with an emission peak beyond 900 nm has severely hindered the development and widespread application of NIR pc-LEDs. This study presents a strategy for precise control of energy-state coupling in spinel solid solutions composed of MgxZn1–xGa2O4 to tune the NIR emissions of Cr3+ activators. By combining crystal field engineering and heavy doping, the Cr3+–Cr3+ ion pair emission from the 4T2 state is unlocked, giving rise to unusual broadband NIR emission spanning 650 and 1400 nm with an emission maximum of 913 nm and a full width at half-maximum (fwhm) of 213 nm. Under an optimal Mg/Zn ratio of 4:1, the sample achieves record-breaking performance, including high internal and external quantum efficiency (IQE = 83.9% and EQE = 35.7%) and excellent thermal stability (I423 K/I298 K = 75.8%). Encapsulating the as-obtained phosphors into prototype pc-LEDs yields an overwhelming NIR output power of 124.2 mW at a driving current of 840 mA and a photoelectric conversion efficiency (PCE) of 10.5% at 30 mA, rendering high performance in NIR imaging applications.
研究领域:
材料科学
·
光电
·
光子学
·
固体物理
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuang Zhao,Lulu Lou,Shuwen Yuan,Daoyun Zhu,Fugen Wu,Zhongfei Mu
The near-infrared phosphor converted light-emitting diodes (NIR pc-LEDs) have been broadly used in the fields of night vision, biomedicine, nondestructive testing and food analysis. Over the past few years, many Cr 3+ doped NIR phosphorus has been reported. However, the realization of ultra-broad band NIR emission with high quantum efficiency remains a great challenge. Here, we report an ultra-broadband NIR emitting phosphor Li 3 Sc 1.92 (PO 4 ) 3 :0.08Cr 3+ with a full width at half maximum (FWHM) of 240 nm. The reason for the ultra-broad emission band is that the host Li 3 Sc 2 (PO 4 ) 3 provides two different kinds of ScO6 octahedral sites for Cr 3+ ions to occupy. This FWHM is better than most NIR emitting phosphors reported so far. Our research indicates that Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ phosphors have great potential in night vision and NIR spectroscopy .
研究领域:
材料科学
·
光电技术
·
光子学
·
光谱学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）