Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 10
·3654-3661
·
IF 5.7
Yaowu Wang,Guocheng Pan,Jianfeng Wang,Yinyan Li,Zhenping Wu,Shiqing Xu,Gongxun Bai
Light-emitting diodes (LEDs) combined with near-infrared (NIR) phosphors are rapidly becoming important light sources for food safety, anti-counterfeiting and biological imaging due to non-destructive and non-toxic advantages. Single-phase materials with multi-mode luminescence under different stimuli are crucial for the development and applications of smart NIR phosphors. Here, we have developed multifunctional Cr3+ activated MgGa2O4 (MGO:Cr3+) phosphors with simultaneous photoluminescence and mechanoluminescence for NIR sensing. Under 470 nm excitation, the phosphors can produce emission bands from 650 to 850 nm. Meanwhile, the flexible devices based on phosphors can exhibit strong emissions in response to mechanical deformation, such as shock and friction. In addition, optical manometers based on luminescence from phosphors can achieve pressure sensing from 7 to 64 KPa. More intriguingly, we combined the MGO:Cr3+ phosphor with a blue LED chip to fabricate an NIR phosphor-converted LED for anti-counterfeiting and biological tissue penetration. Our results suggest that the multifunctional NIR phosphors with simultaneous photoluminescence and mechanoluminescence have potential applications in various sensing devices.
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高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 10
·4022-4029
·
IF 8.1
Wang Yuzhen,Jin Jiance,Liu Gaochao,Xia Zhiguo
We designed and fabricated a flexible optical fiber based on LiGa 4 (MgGe) 0.5 O 8 :Cr phosphors with temperature-dependent fluorescence characteristics. Specifically, the full width at half maximum (FWHM) of the emission band broadens with elevated temperature due to the increased electron–phonon interactions in the matrix. Moreover, the FWHM values subtly increase with the increase in the concentration of the [Mg 2+ –Ge 4+ ] unit in LiGa 4 (MgGe) 0.5 O 8 :Cr, along with the increase in the external quantum efficiency from 24.8% to 50.0%. Furthermore, these phosphors exhibit excellent luminescence thermal resistance, with an outstanding absolute sensitivity of 7.51 cm −1 K −1 at 443 K and a good relative sensitivity of 0.64% K −1 at 303 K. Finally, a flexible all-fiber system is employed to monitor the real-time temperature of objects with excellent repeatability, precision, and stability. This work not only explores the promising application of Cr 3+ -doped luminescent materials with sharp emissions but also enriches the new routes of optical temperature measurement owing to the bandwidth characteristics.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 6
·2313-2322
·
IF 4.569
Shuaishuai Yu,Zhiting Wei,Junxiao Wu,Tianli Wang,Jia Zhang,Xingliang Luo,Yanyan Li,Chuang Wang,Lei Zhao
Nowadays, near-infrared (NIR)-emitting luminescence materials with broad application prospects have drawn great attention. SrGa12O19:Cr3+ is a new type of solid light source material that emits NIR light with wide application prospects. However, the narrow full width at half maximum (FWHM) restricts its further multifunctional applications. Therefore, we propose a novel methodology to increase the FWHM by artificially adjusting the strength of the crystal field by doping Sc3+ ions. By employing Rietveld refinement results, parameters evolution and Raman spectra, Sc3+ ions are proved to successfully occupy the Ga3+ crystallographic sites. Combining the spectroscopy characteristics, it was confirmed that the FWHM was increased from 78 nm (127 977 cm−1) to 104 nm (96 739 cm−1) with the optimum quantum efficiency of 96.55%. In addition, the excellent thermal stability and unprecedented suitability to a 450 nm blue-chip indicate that it is a potential luminescent material candidate for fluorescence conversion NIR light-emitting diode (LED). Finally, the successful implementation of the night vision on vegetation, biological imaging of human tissue and food inspection for different pork portions illustrate the strong commonality of the method.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 12
·5553-5561
·
IF 3.5
Long Chen,Jiyou Zhong,Jiajun Wu,Weiren Zhao
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are considered as next-generation of NIR light sources for spectroscopy. However, it is still a challenge to develop an inexpensive broadband NIR phosphor with relatively long-wavelength (λem > 800 nm) emission. In this work, an octahedral Al3+-containing pyrophosphate Al0.5Ta0.5P2O7 with a cubic structure was chosen as a host for Cr3+. Synthesizing this material indicates that this phosphor exhibits a broadband NIR emission peaking at 850 nm with a full width at half maximum (FWHM) of 155 nm under 465 nm excitation. The crystal structure, morphology, local structure, and photoluminescence properties of this material were investigated in detail. The results revealed a full understanding of this new material. A NIR pc-LED device fabricated by using this material combined with a 450 nm LED chip generates a NIR output power of 10.7 mW and a NIR photoelectric conversion efficiency of 3.4% under a 100 mA driving current, which shows the possibility of this material to be utilized in NIR pc-LED applications. Moreover, this material exhibits a linear relationship between emission intensity, decay time and temperature in a wide temperature range, implying that excellent multi-model temperature sensing applications can be expected.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hongshi Zhang,Jiyou Zhong,Xiaoli Zhang,Huanxin Yang,Zhongfei Mu,Weiren Zhao
Spectral coverage and saturability within 700–1100 nm of phosphor-converted near infrared light-emitting-diodes (pc-NIR LEDs) are crucial for the practical applications in bioimaging, food quality analysis and night vision fields, while developing ultra-broadband NIR phosphors are still a challenge. Herein, we reported a broadband NIR phosphor LiInP 2 O 7 : Cr 3+ in phosphate system. The emission spectrum of this phosphor covers 700–1200 nm with a full width at half maximum (FWHM) of 165 nm and an emission peak centering at 860 nm under 460 nm excitation. This broadband emission is verified to be derived from 4 T 2 g → 4 A 2 g transition of Cr 3+ in a single crystal site. To further expand the emission spectrum , Cr 3+ →Yb 3+ energy transfer in LiInP 2 O 7 was designed, and an ultra-broadband emission with a FWHM of 225 nm was obtained through appropriate amount of Yb 3+ codoping. The energy transfer efficiency can reach as high as 81% in this material. Furthermore, the energy transfer mechanism, quantum yield , thermal stability and fabrication performance were investigated in detail, demonstrating the ability of achieving ultra-broadband and efficient NIR emission of LiInP 2 O 7 : Cr 3+ , Yb 3+ phosphor material.
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INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 31
·18304-18313
·
IF 4.6
Chen Yongying,Wei Mingkai,Shuang Xiaoyu,Cao Binyang,Li Xinyi,Liang Jiaying,Liu Haipeng,Hao Yanjun,Cong Yan,Zhang Xuejie,Lei Bingfu
The performance of near-infrared
phosphor-converted light-emitting
diodes (NIR pc-LEDs) is fundamentally limited by the phosphor, which
tends to form defects during high-temperature air synthesis, and these
defects degrade their luminous efficiency and thermal stability. Herein,
we report a Li 2 CO 3 -assisted solid-state strategy
that simultaneously enhances crystallinity and mitigates the undesired
oxidation of Cr 3+ to Cr 4+ in Al 5 BO 9 :Cr 3+ . This is related to the unique decomposition
chemical property of Li 2 CO 3 at high temperatures,
which creates favorable conditions for grain growth and the stabilization
of Cr 3+ . The optimized phosphor exhibits broadband NIR
emission spanning 650–900 nm under 400 nm excitation, with
the internal quantum efficiency significantly increased from 55.4%
to 80.5%. Meanwhile, the luminescence intensity retention at 423 K
rises from 75.3% to 81.9%. A prototype NIR pc-LED fabricated with
a 440 nm chip delivers an output power of 59.4 mW at a drive current
of 100 mA and a photoconversion efficiency of 21%. In cultivation
trials with butterhead lettuce, supplemental lighting from this NIR
pc-LED significantly promotes plant growth, increasing fresh weight
by 28.5% and dry weight by 18.9%. This work provides a practical and
effective flux-assisted approach for preparing high-performance Cr 3+ -doped NIR phosphors under ambient atmosphere.
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PubMed
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 10
Mingkai Wei,Yanjun Hao,Xuejie Zhang,Wei Li,Haoran Zhang,Bingfu Lei
Near-infrared (NIR) phosphor-converted LEDs (pc-LEDs) are critical for smart agriculture and night vision, but their efficiency is limited by low external quantum efficiency (EQE) of phosphors. Herein, the introduction of Al 3+ ions via chemical substitution increased the EQE of the GdGa 2.85 (BO 3 ) 4 :0.15Cr 3+ NIR phosphor from 8.3% to 30.7% (a relative increase of 270%). Importantly, an “absorption-efficiency decoupling” paradigm is identified: while the Al 3+ substitution reduces the absorbance, confirmed by Density Functional Theory, diffuse reflectance spectra, and X-ray photoelectron spectroscopy, the quantum efficiency is significantly increased. Theoretical analyses and spectroscopic evidence suggest that the superior EQE gain stems from Al 3+ -induced crystal field enhancement and subsequent energy level remodeling. This remodeling optimizes the Cr 3+ excited state dynamics by suppressing the non-radiative transitions pathway and increasing the radiative transitions, thus overcoming the detrimental effects of absorption reduction. The optimized phosphor, combined with a blue LED chip, produced an NIR pc-LED achieving 41.7 mW output power and 15.7% photoelectric efficiency at 100 mA. The device successfully demonstrated potential for precision agriculture and night vision. This work provides novel insight into “absorption-efficiency decoupling” and offers a new design strategy for efficient Cr 3+ -doped NIR phosphors.
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高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Zhiyuan Pan,Sihan Feng,Yun Wang,Xuejiao Wang,Qi Zhu,Ji-Guang Li
The near-infrared (NIR) light of 900–1100 nm exhibits enormous application potential in fields such as optical communication and biological detection. However, high-efficiency phosphors emitting beyond 900 nm remain extremely limited due to non-radiative deactivation. In this study, a 455 nm blue light excitable NIR phosphor that efficiently emits in the wide range of 700–1200 nm (peaking at ∼960 nm) was obtained through Cr 3+ /La 3+ codoping of Ruddlesden-Popper type Sr 3 Zr 2 O 7 perovskite, whose internal/external quantum efficiencies (%) and thermal stability of luminescence ( I 423 / I 298 , %) reached ∼92.4/57.5 and 73, respectively. Experimental and theoretical analysis found the decisive role of the La 3+ codopant in Cr 3+ luminescence: it not only inhibited Cr 3+ from oxidation but also attracted the Cr 3+ ions to aggregate around it to form Cr 3+ –Cr 3+ pairs for the aforesaid excellent luminescence. Combining the NIR phosphor with a Si-PIN photodetector created a highly effective blue-to-NIR conversion unit, demonstrating the application potential of the phosphor for underwater wireless optical communication (UWOC).
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2026
·Vol. 103
·期 10
·103028
·
IF 3.4
Yan Xu,Youjia Wang,Dongyan Bao,Jie Zhang,Mingjun Song
A new double-perovskite structured phosphor, Sr 2 MgWO 6 : xCr 3+ , yYb 3+ , with device potential has been successfully synthesized. • The phosphor exhibits emission performance covering the NIR-I to NIR-II regions, with a wavelength range exceeding 400 nm. • This phosphor exhibits excellent thermal stability, and the optical temperature-sensing performance was investigated using FIR. • The phosphor exhibits a Cr 3+ -Yb 3+ energy transfer efficiency (η ET ) exceeding 50%. Near-infrared (NIR) phosphors have shown great potential for applications in temperature sensing, night vision surveillance, agricultural illumination, and so on. In this study, a series of Sr 2 MgWO 6 (SMW): xCr 3+ , yYb 3+ phosphors were synthesized via a conventional high-temperature solid-state reaction method. Firstly, the effects of Mg 2+ content variation on the luminescent properties of Cr 3+ singly doped phosphors were systematically investigated. It was found that the quantum efficiency of the samples reached a maximum when the Mg 2+ content was 120% of the stoichiometric ratio, attributed to the optimization of local crystal field environment around Cr 3+ ions. On this basis, Cr 3+ -Yb 3+ co-doped phosphors were further optimized by introducing Yb 3+ ions, and the optimal composition was determined to be SMW: 0.5% Cr 3+ , 1.5% Yb 3+ . Under 360 nm excitation, the optimized phosphor exhibited intense NIR emission covering the wavelength range of 713-1137 nm. Benefiting from an exceptionally efficient Cr 3+ →Yb 3+ energy transfer (η ET = 50.18%) achieved at a low Yb 3+ concentration of only 3.0%, the optimized phosphor exhibits a significantly broadened emission bandwidth and enhanced NIR output intensity. Furthermore, the thermal stability of the optimal sample was evaluated by temperature-dependent emission spectra. The results revealed excellent luminescence stability of the phosphor at elevated temperatures. Notably, based on the fluorescence intensity ratio (FIR) between Cr 3+ and Yb 3+ emissions extracted from the variable-temperature spectra, a self-referencing optical temperature sensor was constructed. The absolute and relative sensitivities were calculated, demonstrating the feasibility of the developed phosphor for non-contact temperature sensing applications. Additionally, performance tests on pc-LEDs confirmed their excellent spectral stability, indicating the material's potential for practical applications in NIR pc-LEDs. This work provides a promising strategy for designing broadband NIR-emitting phosphors with dual functionalities of lighting and temperature sensing. Download: Download high-res image (255KB) Download: Download full-size image
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Jiarao Shi,Xiaohao Chen,Xincui Shi,Ruiping Deng,Ran Pang,Su Zhang
In this study, a series of non-gallate broadband near-infrared Mg 1.4 Zn 0.6 SnO 4 :Cr 3+ ,Bi 3+ phosphors were successfully synthesized via solid-state reaction method. Occupying octahedral sites in a weak crystal field environment, Cr 3+ ions in Mg 1 . 4 Zn 0 . 6 SnO 4 exhibit intense broadband near-infrared emission centered at 759 nm, which originates from two distinct Cr 3+ centers located at Sn 4+ and Mg 2+ /Zn 2+ sites. Although Bi 3+ does not contribute to luminescence in this phosphor and its co-doping has minimal influence on the crystal structure, Cr 3+ valence, or the concentration of effective traps, it significantly enhances both the luminescence efficiency and persistent luminescence performance by improving the crystallinity of the phosphor. With Bi 3+ codoping the external quantum efficiency of the phosphor was promoted from 15 % to 21 % and the persistent-luminescence duration was extended to over 48 h. Furthermore, the potential application of Mg 1.4 Zn 0.6 SnO 4 :0.01Cr 3+ ,0.07Bi 3+ in NIR phosphor-converted LED is explored and demonstrated. This work not only provide a new non-gallate broadband near-infrared phosphor but also proposes a new strategy for synchronously improving the luminescence efficiency and persistent-luminescence performance of Cr 3+ activated phosphors for multifunctional applications.
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高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Guocheng Pan,Yiheng Yue,Jianfeng Wang,Zhenping Wu,Shiqing Xu,Gongxun Bai
Near-infrared (NIR) phosphors have garnered notable attention for their extensive applications in anti-counterfeiting, optical imaging , non-invasive medical diagnosis and detection. Nevertheless, the quest for NIR phosphors with outstanding detection and sensing capabilities remains a challenge. In this study, we have successfully prepared Ga 1.6 Mg 0.2 Ge 0.2 O 3 :Cr 3+ ,Yb 3+ NIR phosphors by codoping and substitutation strategies. When incorporated into polydimethylsiloxane films, these phosphors demonstrated a direct correlation between luminescence intensity ratio and applied stress under 450 nm excitation. Moreover, variations in luminescence spectra occurred with different compositions and concentrations of liquids coated on the film, facilitating both force measurement and composition analysis . Furthermore, a NIR phosphor-converted light-emitting diode (pc-LED) was fabricated by integrating phosphor with a blue LED chip, exhibiting excellent performance. Utilizing the prepared NIR pc-LED as a light source , we facilitated non-destructive imaging, night vision, and anti-counterfeiting applications with an infrared camera. These findings suggest that the synthesized NIR phosphors possess hold promise for diverse detection and sensing applications.
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ACS Applied Optical Materials
·
2023
·
IF 0
Zhennan Wang,Yi Wei,Zhiliang Ren,Wei Wang,Dong Tu,Guogang Li
Near-infrared (NIR) light serves a key role in many potential applications such as food analysis, biomedical devices, night vision, and so on. As an important component of NIR phosphor-converted light-emitting diodes (pc-LEDs), the adjustment of emission peak position and spectral width of Cr3+-doped phosphors is still considered to be a crucial challenge. Herein, the two emissions at 740 nm from [Cr1O6] and 830 nm from [Cr2O4] were realized to broaden the emission band in the Al2.26Ge0.74O4.87:Cr3+ (AGO:Cr3+) phosphor. Moreover, with increasing Cr3+-doped concentration, the crystal field strength decreases and energy transfer from [Cr1O6] to [Cr2O4] is enhanced. The emission peak originating from [Cr2O4] gradually becomes dominant, resulting in a spectral red shift and broadening. The optimized AGO:0.7% Cr3+ phosphor shows remarkable thermal stability, of which the integrated intensity at 373 K keeps 86% of the initial intensity at 298 K. Under 405 nm excitation, the internal quantum efficiency could reach 70% and the external quantum efficiency was measured to be 23%. The application of night vision can be implemented based on the AGO:Cr3+-fabricated NIR pc-LED. This work achieves simultaneous modulation of luminescence color and spectral width by controlling the Cr3+-doped concentration, which provides a feasible strategy for NIR emission adjustment.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
发光
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