MOLECULES
·
2023
·Vol. 28
·期 24
·8059
·
IF 4.6
Tao Wang,Bingkai Gao,Jiehong Li,Zhijun Wang,Panlai Li
Cr3+-doped Sr3Ga2Ge4O14:0.03Cr3+(SGGO:0.03Cr3+) phosphor was synthesized via a high-temperature solid-phase method. Considering the tunable structure of SGGO, Ga3+ions in the matrix were substituted with In3+ions at a certain concentration. The tuned phosphor produced a red-shifted emission spectrum, with its luminescence intensity at 423 K maintained at 63% of that at room temperature; moreover, the internal quantum efficiency increased to 65.60%, and the external quantum efficiency correspondingly increased to 21.94%. On this basis, SGIGO:0.03Cr3+was encapsulated into apc-LED, which was applied in non-destructive testing (NDT) experiments, successfully realizing the recognition of water and anhydrous ethanol, proving its potential application in the field of NDT.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 6
·9753-9761
·
IF 5.2
Li Li,Haoliang Yang,Yongjie Wang,Faling Ling,Xianju Zhou,Guotao Xiang,Zhongmin Cao,Sha Jiang,Zhiyu Yang,Yongbin Hua
Novel Ca 2 ScNbO 6 (CSNO): Cr 3+ phosphors were synthesized through a solid-phase method. The crystal structures, luminescence performances, and applications were introduced in this work. The optimized doping concentration was found with a Cr 3+ concentration of 0.01 mol. Under the 336 nm excitation, the recorded photoluminescence spectrum in the range of 650–1300 nm indicated that the obtained sample can emit a broad near-infrared emission with a dominant peak of 858 nm while the full width at half maximum (FWHM) was determined to be 191 nm. To gain a deeper comprehension of the luminescent properties, the crystal field strength was investigated as Dq/B = 2.03, and the electron-phonon coupling for parameter S was calculated to be about 2.01. As for the potential application, utilizing the variable temperature decay lifetime technique, the relative sensitivity (S R ) was approximately 1.16% K −1 at 387 K, which can be promised for utilization in optical temperature measurement. On the other hand, a near-infrared phosphor-converted lighting-emitting diode ( Pc -LED) was fabricated for night vision. Eventually, the security ink based on the obtained sample was made for use in the anti-counterfeiting field.
研究领域:
材料科学
·
光学工程
·
无机化学
·
功能材料
·
生物医学工程
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高影响因子
Advanced Materials Technologies
·
2022
·Vol. 8
·期 4
·2201181
·
IF 8.856
Bo-Mei Liu,Xiao-Xuan Guo,Lin Huang,Rong-Fu Zhou,Rui Zou,Chong-Geng Ma,Jing Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have sparked tremendous interest in NIR spectroscopy. However, conventional NIR pc-LEDs with a narrow full-width at half-maximum (FWHM) and single-emission block the detection scope and detection accuracy for NIR spectroscopy analysis. Herein, a multicenter strategy is developed for the preparation of blue-light-excitable Mg 2 SnO 4 :Cr 3+ ,Ni 2+ phosphors with NIR dual-emission (λ em = 830/1480 nm, total FWHM = 532 nm). Benefiting from the unique NIR dual-emission, a ratiometric measurement system with a self-calibration function is established for highly precise and nondestructive detection. For the first time, a good linear relationship with a detection limit of 0.22 wt.% is achieved for quantitative, non-invasive detection of water/ethanol mixtures in the field of NIR spectroscopy applications. Additionally, a super-broadband pc-LED with a NIR output power of 16.1mW@300 mA is fabricated, demonstrating its applications in high-penetration imaging and anticounterfeiting. These results provide an approach to achieving NIR dual-emission phosphor, thereby opening a new avenue for exploring ratiometric NIR spectroscopy techniques.
研究领域:
材料科学
·
光学工程
·
分析化学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 27
·53694-53702
·
IF 5.6
Ke Chen,Cheng Zhou,Peixin Gao,Hanzi Jiang,Ming Cheng,Sanlin Liu,Wai-Yeung Wong,Zhi Zhou,Mao Xia
In recent years, Mn 4+ doped oxide phosphors have attracted extensive attention in the field of indoor plant light supplementation due to their red emission. In this study, a rare earth-free red phosphor, Li 3 Mg 2 NbO 6 (LMN):Mn 4+ , was prepared by high-temperature solid-state reaction. The resultant phosphor exhibited red emission within the 600–800 nm band, with a peak at 668 nm, when excited by 351 nm and 468 nm. DFT calculations of charge density and formation energies determined that Mn 4+ tends to occupy the Mg 2+ sites, leading to a charge imbalance that affects the luminescence intensity of the material. In light of the foregoing, charge compensation strategy was adopted in order to achieve charge balance through excessive doping of Li + , Na + and K + alkali metal ions. The optimal doping concentrations of Li + , Na + and K + were determined to be 0.35, 0.4 and 0.3, respectively. The luminescence intensity of LMN:Mn 4+ phosphors was found to increase to 453%, 500% and 708% of the initial intensity. Concurrently, the quantum efficiency (QE) of the phosphor LMN:Mn 4+ was enhanced from 33.8 % to 48.1%, 57.04% and 69.19%, respectively, by means of additional doping with Li + , Na + and K + . At 100 °C, the emission intensity of the LMN:0.01Mn 4+ phosphor was found to be 73.6% of that at room temperature (25 °C). The thermal stability of additional Li + , Na + and K + by charge-compensated doping is slightly reduced. Finally, LMN:0.01Mn 4+ , 0.3K 2 CO 3 phosphor and a blue light chip were used to prepare the phosphor conversion light-emitting diodes (pc-LEDs). The electroluminescence spectra of the pc-LEDs exhibited a blue and red double emission, corresponding to the absorption bands of chlorophyll B and photochrome P R . This finding indicates that pc-LEDs have considerable potential for application in the field of plant growth LED lamps.
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高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Chengliang Lyu,Dashuai Sun,Zeyu Lyu,Sida Shen,Pengcheng Luo,Zhihang Yue,Zheng Lu,Luhui Zhou,Hongpeng You
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) light sources have great potential for applications in information encryption , night vision, and non-destructive testing. However, designing efficient NIR phosphors with wide emission band remains a significant challenge. Here, we report a garnet-type NIR phosphor Gd 2 Mg 3 Ge 3 O 12 :Cr 3+ ,Yb 3+ (GMG:Cr 3+ ,Yb 3+ ). The GMG:0.06Cr 3+ phosphor shows a broadband emission peaking at 828 nm under 450 nm excitation, with a full width at half maximum (FWHM) of 188 nm. When Yb 3+ ions are introduced to construct Cr 3+ -Yb 3+ energy transfer, the obtained GMG:Cr 3+ ,Yb 3+ phosphor displays further widened emission band with a FWHM of 272 nm. Moreover, GMG:Cr 3+ ,Yb 3+ phosphor and commercial blue LED chips are combined to create NIR pc-LEDs, which have a photoelectric efficiency of 5.76% @ 100 mA and a maximum NIR output power of 17.21 mW @ 100 mA, demonstrating its potential applications in night vision, non-destructive testing, and information encryption.
研究领域:
材料科学
·
光电子学
·
固态照明
·
光子学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·65882-65888
·
IF 5.6
Yonglin Chen,Haoyi Wu
In this work, Li 3 Mg 2 TaO 6 :Cr 3+ phosphors were designed and synthesized by solid-phase method. Spectra show that the Cr 3+ -doped phosphors exhibit broadband emissivity in the range of 700–1200 nm, with a full width at half maximum (FWHM) of approximately 165 nm at wavelength excitation at 462 nm. The internal quantum efficiency (IQE) of phosphors is 63.1 %. Under a driving current of 270 mA, the output power of the device can achieve 36.2 mW. Combining Li 3 Mg 2 TaO 6 :Cr 3+ phosphor and a 460 nm blue chip, a near-infrared pc-LED was fabricated and demonstrated for night vision of objects, as well as rapid imaging of the veins of a fist.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sihan Yang,Changshuai Gong,Ziying Wang,Liang Dong,Xuejiao Wang,Ji-Guang Li
To overcome the problem of severe thermal quenching (TQ) of near-infrared (NIR) phosphors, the NIR phosphor with antithermal quenching performance is urgently needed. In this work, a negative thermal expansion (NTE) material Yb2–2xCr2xW3O12 was prepared. Through a comprehensive analysis involving in situ X-ray diffractometer (XRD), thermogravimetry (TG), and Rietveld refinement, it was concluded that, at room temperature, the sample adopts a trihydrate orthorhombic structure (Yb2W3O12·3H2O) and does not exhibit negative thermal expansion (NTE) behavior. However, after dehydration at 373 K, anhydrous orthorhombic Yb2W3O12 (space group Pbcn), which exhibits obvious NTE properties, was obtained. The underlying mechanism is that when water molecules enter the crystal and occupy vacancies, the Yb–O–W bonds bend, restricting the transverse thermal vibrations of the Yb–O–W bonds. The characteristic emission of Yb3+ within the range of 800–1300 nm was observed under 468 nm blue light irradiation due to the efficient energy transfer from Cr3+ → Yb3+. Remarkably, the prepared NIR phosphor has antithermal quenching performance, and at 398 K, the intensity of the strongest emission can maintain 1.89 times that of the room temperature, surpassing most NIR phosphors. The antithermal quenching phenomenon is attributed to cell contraction, which reduces the distance between the sensitizer and activator, thereby enhancing the energy transfer efficiency and increasing the luminous intensity. The combination of 460 nm excitable strong NIR emission and antithermal quenching suggests potential application in biomedical imaging and infrared night vision technologies. The NIR pc-LED device, prepared by coating the Yb1.94Cr0.06W3O12 phosphor on a commercial 460 nm chip, demonstrated a high optoelectronic efficiency and high output power, making it well-suited for night vision applications. Furthermore, the efficient NIR-I/II emission from Yb1.94Cr0.06W3O12 was proved to be highly effective for compositional analysis. This study offers valuable insights for designing NIR phosphors with excellent thermal quenching resistance.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yixin Sun,Yining Wang,Minliang Deng,Xiaole Xing,Yiying Zhu,Mengmeng Shang
The swift progress in portable spectrometer technology has fostered a widespread need for compact light sources. Concurrently, near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs), characterized by their low cost and compact structure, emerge as an optimal choice. Inspired by phase optimization through fluxes, we successfully synthesized pure phase Lu 3 Mg 2 GaSi 2 O 12 (LMGS):Cr 3+ , 3 wt%MgF 2 luminescent materials by incorporating various fluxes including LiF, NaF, MgF 2 , CaF 2 , SrF 2 and BaF 2 . These materials emit broadband NIR light ranging from 620 nm to 1150 nm, with full width at half-maximums (FWHMs) exceeding 125 nm. By employing a dual-fluxes strategy to further enhance the luminescence intensity of Cr 3+ , the LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 sample exhibits a 2.45 times increase in emission intensity compared to the LMGS:3%Cr 3+ , 3 wt%MgF 2 sample. Concurrently, the quantum efficiency rises from 24 % to 46 %. Moreover, the integrated emission intensity of LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 retains at 75 %@425 K of its value at RT. Upon coupled with a 430 nm LED chip, the luminescent material exhibits an NIR output power of 43.8 mW@300 mA, indicating promising applications in rapid night identification, night vision and non-destructive testing.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
无机化学
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高影响因子
Light-Science & Applications
·
2026
·Vol. 15
·期 1
·229
·
IF 24
Yu Dechao,Liu Haisheng,Lv Mengting,Li Benchun,Zhou Yayun,Han Xinxin,Zhang Dawei
New generation of Cr 3+ -free eco-friendly phosphors (no risk of Cr 3+ → Cr 6+ oxidization toxicity) are highly sought to develop broadband NIR light sources. As an essential element for body health, Fe 3+ ion would be an exceptional alternative in strong octahedral crystal field. Here, the Fe 3+ activators were utilized in orthoborate-pyroborate A 2 Sc 2 B 4 O 11 for creating novel NIR-emitting phosphors. A broad absorption over 240–450 nm due to O 2- → Fe 3+ charge transfer transition was recorded for Sr 2 Sc 2 B 4 O 11 :Fe 3+ (SSBO:Fe 3+ ) at 370 nm and Ba 2 Sc 2 B 4 O 11 :Fe 3+ (BSBO:Fe 3+ ) at 355 nm. Resultant NIR emissions with large full width at half maximum about 170 nm were obtained for SSBO:Fe 3+ peaked at 975 nm and BSBO:Fe 3+ at 930 nm. The unique excitation of Fe 3+ doping towards near-ultraviolet (near-UV) region was initially achieved for potential advantage of coupling a mainstream UV chip. Codoping of Yb 3+ into A 2 Sc 2 B 4 O 11 :Fe 3+ made emission peak red-shift towards 1000 nm and ~ 160-fold enhancement in the integral intensity owing to a robust energy extraction from the major dark (nonluminous) Fe 3+ . The optimized SSBO:0.02Fe 3+ ,0.15Yb 3+ exhibited considerable internal and external quantum efficiency ~ 78% and 48%, respectively. Compared to the luminescence thermal stability of ASBO:Fe 3+ (32%@373 K, i.e., sustaining 32% of its room-temperature emission intensity at 373 K), the Yb 3+ codoping endowed much superior stability > 63%@373 K, and additional temperature sensing with relative sensitivity ~ 1.5% K −1 at 423 K. Ultimately, by coating the novel phosphors onto UV ~ 365 nm chips, the home-made pc-LEDs were applied in night vision, food inspection, biomedical imaging, and spectroscopy analysis.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·
IF 4
Bowen Wang,Changshuai Gong,Xuyan Xue,Meiting Li,Qi Zhu,Xuejiao Wang,Ji-Guang Li
A series of CaGdAlO4-type layered perovskite phosphors showing deep red luminescence (λem = 711 nm, λex = 338 nm) were synthesized via a solid-state reaction. A comprehensive analysis performed via photoluminescence, X-ray photoelectron spectroscopy, thermoluminescence, and fluorescence decay revealed that the deep red luminescence is related to oxygen defects and particularly oxygen interstitials. The defect-related luminescence was effectively regulated through partial substitution of multi-cationic sites (the Ca2+ site with Mg2+, Sr2+, and Ba2+; the Gd3+ site with La3+, Y3+, and Lu3+) and full substitution of Gd3+ with Y3+. Remarkably, a 383.3% stronger luminescence was obtained through partial substitution with Lu3+, and the quantum yield of luminescence reached 28.74%, which is higher than those values of most previously reported self-luminescent systems. A pc-LED device was fabricated using this phosphor, and the device was shown to have potential application in indoor plant cultivation.
研究领域:
材料科学
·
光学工程
·
农业科学
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PubMed
高影响因子
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
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高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202323
·
IF 10.05
Chaojie Li,Jiyou Zhong
Near-infrared (NIR) spectroscopy based on phosphor-converted light-emitting-diode (pc-LED) has promising applications in food quality analysis, security monitoring, medical diagnosis, and bioimaging fields, stimulating the demand of developing NIR phosphors with high-performance. Herein, a highly efficient and thermally robust Ca 3 MgHfGe 3 O 12 :Cr 3+ NIR phosphor is discovered, which exhibits a broadband NIR emission (λ em = 800 nm) covering 700 to 1100 nm region with an internal quantum efficiency as high as 90.7% when excited by 460 nm blue light. Moreover, the emission intensity at 423 K retains 84.5% of that at room temperature. The highly efficient and thermally robust luminescence of this material is mainly ascribed to the ultrawide bandgap of host, extremely weak electron–photon coupling effect, defect-free, and highly structural rigidity. The NIR pc-LED device fabricated by using the optimized Ca 3 Mg 0.97 Hf 0.97 Ge 3 O 12 :0.06Cr 3+ phosphor combined with blue (λ em = 455 nm) LED chip produces an excellent NIR output power of 49.5 mW @ 11.5% under a driving current of 150 mA, which indicates a superiority to the device fabricated by using the well-known efficient ScBO 3 :Cr 3+ phosphor under the same condition. Therefore, this work not only provides a promising broadband NIR material, but also highlights the design rules for searching high-performance NIR materials toward spectroscopy applications.
研究领域:
材料科学
·
光电技术
·
光谱学
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高影响因子
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