CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Leqi Yao,Qiyue Shao,Shouyu Han,Chao Liang,Jinhua He,Jianqing Jiang
Near-infrared (NIR) phosphors have received increasing attention for designing novel solid-state light sources with broadband NIR output. In this work, a novel NIR phosphor LiScP2O7:Cr3+ (LSP:Cr3+) is developed with the emissions (750–1100 nm) completely in the NIR spectral range. Under 470 nm excitation, LSP:0.06Cr3+ shows broadband NIR emissions peaking at ∼880 nm, with a full width at half maximum (FWHM) of ∼170 nm and an internal quantum yield (IQY) of ∼38%. Moreover, photoluminescence (PL) improvements of LSP:Cr3+ phosphors are achieved by Yb3+ codoping, leading to the broadened FWHM (up to ∼210 nm), increased IQY (ηmax = ∼74%), and reduced thermal quenching. The energy transformation processes in LSP:Cr3+,Yb3+ are quantitatively analyzed on the basis of PL lifetime and QY measurements, revealing that the PL improvements by Yb3+ codoping principally originate from the energy transfer from Cr3+ to more efficient and thermally stable Yb3+ emitters. Finally, NIR phosphor-converted light-emitting diodes (pc-LEDs) are fabricated by combining LSP:Cr3+,Yb3+ phosphors with blue LED chips, giving a maximum NIR output power of ∼36 mW and photoelectric efficiency of ∼12% at 100 mA drive current. The results suggest that the investigated phosphors would be promising luminescent converters for broadband NIR pc-LED applications.
研究领域:
材料科学
·
光电技术
·
光子学
·
固态照明
✓ 已验证
DOI
高影响因子
Advanced Physics Research
·
2022
·Vol. 2
·期 4
·2200056
·
IF 0
Kuangnan Lyu,Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr 3+ -doped AlNbO 4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr 3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr 3+ emitters in different Al 3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO 4 :Cr 3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr 3+ -doped AlNbO 4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
研究领域:
光学材料
·
生物医学光学
·
光电子学
·
无机功能材料
·
分子影像
✓ 已验证
DOI
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2853-2862
·
IF 4
Zurong Liao,Chaojie Li,Jiyou Zhong,Yang Li,Weiren Zhao
A broadband near-infrared (NIR) light source based on a phosphor-converted light-emitting diode (pc-LED) has attracted increasing interest to be used in non-destructive examination, security-monitoring and medical diagnosis fields, which stimulates the exploration of NIR phosphors with high performance. Herein, a series of Cr3+-activated garnet Ln3ScInGa3O12:Cr3+ (Ln = La, Gd, Y, and Lu) phosphors were reported, allowing an emission peak ranging from 726 to 822 nm. Among them, Y3ScInGa3O12:Cr3+ with an optimized Cr3+-doping concentration of 6 mol% exhibits a high internal quantum efficiency (IQE = 83.1%) and excellent absorption efficiency (AE = 44.2%) under 450 nm blue light excitation, enabling an external quantum efficiency as high as 36.7%. Moreover, this material can maintain 93.0% of the initial intensity when heated up to 423 K, implying outstanding thermal stability. Finally, a prototype NIR pc-LED device was fabricated by coating the optimized phosphor on a 455 nm LED chip, which generates a broadband NIR emission with a peak located at 765 nm and a full width at half maximum of 127 nm. The NIR output power and NIR photoelectric conversion efficiency of this device were found to be 38.01 mW and 11.0%, respectively, under 100 mA driving current, demonstrating the feasibility of this material to be applied in NIR pc-LEDs.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 22
·15452-15462
·
IF 3.3
Zurong Liao,Jiyou Zhong,Chaojie Li,Huan Jiang,Weiren Zhao
Broadband near-infrared (NIR) spectroscopy generated from a phosphor-converted light-emitting diode (pc-LED) has multifunctional applications, including food-quality analysis, bio-medical and night-vision, stimulating the demand for developing various NIR phosphors with desired properties. Herein, we selected a highly distorted garnet Ca4HfGe3O12 as the host and explored the near-infrared luminescence of Cr3+. As expected, this material achieved a long-wavelength NIR emission and excellent absorption efficiency based on the effect of Jahn–Teller distortion. The synthesized Ca4HfGe3O12:Cr3+ phosphor exhibits a broadband NIR emission peaking at 840 nm with a full width at half maximum of 150 nm, and the absorption efficiency reaches 48.0%. However, the internal quantum efficiency of the 6 mol% Cr3+-doped sample was measured to be only 35.3% and the integral emission intensity at 373 K kept only 60.1% of the initial intensity. The possible reasons for the unsatisfactory internal quantum efficiency and thermal stability were systematically analyzed, which provided a comprehensive understanding of the relationship between the crystal structure and the luminescent properties of Cr3+-activated garnet-type phosphors. Nevertheless, the as-prepared NIR pc-LED device exhibits a NIR output of 16.52 mW with a NIR photoelectric conversion efficiency of 5.92% driven by 100 mA current, indicating the potential of this material for application in NIR pc-LED.
研究领域:
材料科学
·
光学
·
光子学
·
固体物理
✓ 已验证
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zixuan Wu,Xinxin Han,Yayun Zhou,Ke Xing,Sheng Cao,Li Chen,Ruosheng Zeng,Jialong Zhao,Bingsuo Zou
High performance broadband Near-infrared (NIR) phosphors with high efficiency and excellent thermal stability are highly demanded for constructing the next generation of NIR radiation sources. Herein, a broadband NIR emitting fluoride phosphor K 2 NaInF 6 :Cr 3+ peaking at 774 nm with a Full width at half maximum (FWHM) of 116 nm (1906 cm −1 ) was demonstrated. A high Internal quantum efficiency (IQE) value of 70.2% can be obtained in the as-synthesized K 2 NaInF 6 :Cr 3+ phosphor. Additionally, benefiting from the relatively weak electron phonon coupling effect, the phosphor also exhibits excellent anti-thermal quenching behavior with the emission intensity at 150 °C retaining 78.3% of that at room temperature. A high power NIR pc-LED with NIR radiant flux of 492.85 mW@1050 mA is obtained by combing the as-synthesized K 2 NaInF 6 :Cr 3+ phosphor and a blue LED chip. Utilizing this high power NIR pc-LED as NIR radiation source, high-resolution human hand veins imaging is realized with the assistance of a NIR camera, which indicates that K 2 NaInF 6 :Cr 3+ phosphor has high potential in biological applications.
研究领域:
材料科学
·
光电技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
Journal of Biophotonics
·
2018
·Vol. 12
·期 3
·e201800237
·
IF 3.768
Yubin Liu,Duyang Gao,Mengze Xu,Zhen Yuan
In this study, CuS nanoparticles with optical absorption covering both near-infrared I (NIR-I) and NIR-II biological windows were prepared and served as the contrast agents for multispectral photoacoustic imaging. The physiological parameters including concentrations of deoxyhemoglobin and oxyhemoglobin as well as the water content in the tumor location were quantified based on the multispectral photoacoustic reconstruction method. More importantly, the concentration of CuS nanoparticles/drugs accumulated in the tumor was also recovered after intravenously injection, which are essential for image-guided cancer theranostics. In addition, phantom and in vivo experimental tests were performed to inspect and compare the imaging depth and signal-to-noise ratio (SNR) between the two NIR biological windows. Interestingly, we discovered that a higher SNR was obtained in the NIR-II window than that in the NIR-I window. Meanwhile, the multispectral imaging results also demonstrated that the imaging contrast and penetration depth in the NIR-II window were also significantly improved as compared to those from the NIR-I window.
研究领域:
生物医学工程
·
肿瘤学
·
影像学
✓ 已验证
产品关联
DOI
PubMed
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 MATERIALS SCIENCE
·
2020
·Vol. 55
·期 18
·7843-7856
·
IF 3.553
Chen Pei-Ling,Shi Qun-Ying,Chen Tian,Wang Ping,Liu Yun,Liu Li-Han
Due to the low background and deep tissue penetration of near-infrared light, near-infrared fluorescence (NIRF) probes have received much attention in recent years. Cell membrane targeting probes can be used in in vitro and in vivo for living cell imaging, disease diagnosis and tumor targeted therapy. However, most of the currently available cell membrane probes are blue or green emissive fluorophores, NIRF probes are relatively rare. Herein, we designed and prepared a NIRF chimeric peptide probe named C 16 -CARK, which could target the tumor cell membrane with longtime retention (more than 4 h). Moreover, the C 16 -CARK can heat and disrupt the cell membrane upon high irradiation dose, revealing its dual roles as a cell membrane imaging probe and a photothermal agent. This kind of near-infrared fluorescence probe with cell membrane targeting and retention property provides a well design paradigm for the field of cancer imaging and treatment.
研究领域:
癌症研究
·
分子影像
·
光疗
·
生物医学工程
✓ 已验证
产品关联
DOI
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qinghong Meng,Yuning Zhang,Xiangming Li,Wanjun Yu,Zhijun Xu,Ji-Guang Li
Doping Gd 3 Ga 3 Al 2 O 12 :Cr 3+ with Mg 2+ /Si 4+ pair to develop Gd 3 Ga 3 – y Al 2 – 2 x Mg x Si x O 12 : y Cr 3+ ( x = 0–1.0; y = 0.005–0.05) new garnet solid solution was implemented for the regulation of structure and photoluminescence. Rietveld refinement, SEM/TEM, and UV-Vis-NIR/photoluminescence spectroscopy analysis clarified that Mg 2+ /Si 4+ incorporation increasing resulted in the enlargement of the unit cell, the expansion/larger distortion of [(Ga,Al,Mg,Cr)O 6 ] octahedron, the decrease of crystal field strength, red-shifting and broadening of emission band, and shortening decay times. The optimal Gd 3 Ga 2.97 MgSiO 12 :0.03Cr 3+ phosphor realized broadband NIR emission (centered at ∼760 nm, full-width at half-maximum ∼114 nm) under 450 nm light excitation and exhibited high quantum efficiency (IQE=71.0 %, EQE=29.4 %) and good thermal stability (78.5 %@423 K). The NIR pc-LED fabricated by combining this optimal phosphor with a 450 nm blue LED chip showed satisfactory output power (∼26.83 mW) and conversion efficiency (10.02 %) under a driving current of 100 mA, indicating that this phosphor has huge potential utilized in the construction of NIR pc-LED applied in night vision and noninvasive medical diagnosis.
研究领域:
材料科学
·
光学材料
·
固态照明
·
无机化学
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 16
·11355-11366
·
IF 2.993
Tang Shilin,He Chuansheng,Li Dong,Cai Wenhao,Fan Louzhen,Li Yunchao
To obtain dual active near-infrared (NIR) nanomaterial with strong absorption and emission properties, we report herein a novel precursor reactivity differentiation strategy, i.e., utilizing 1-octadecene (ODE)–Se having the ability to react with Ag salts much stronger and faster than ODE–thiourea, for single-step preparation of Ag 2 Se@Ag 2 S nanocrystals (NCs). With this strategy, we were able to synthesize high-quality Ag 2 Se@Ag 2 S NCs with both excellent NIR absorption and emission properties. Particularly, these nanocrystals possess a rather strong and sharp excitonic absorption peak with a full width at half maximum less than 70 nm and a maximum fluorescence quantum yield as high as 24.3%. Their appealing optical properties and structural features were founded to be highly dependent on the Se to S precursor ratio in the reaction solutions, owing to such a ratio exerting a direct influence on the core sizes and shell thicknesses of the as-formed NCs. Taking advantage of their remarkable NIR absorption properties, self-powered photoelectrochemical-type photodetectors based on the as-prepared Ag 2 Se@Ag 2 S NCs were successfully fabricated, which demonstrate a much better response performance and photostability in comparison with those based on Ag 2 Se NCs.
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）