JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenlu Pan,Qun Zeng,Kai Li,Wei Lü
Tuning the luminescence properties of efficient near-infrared (NIR) phosphors is critical to expanding their applications in NIR spectroscopy. In this paper, a series of novel Cr 3+ -doped LaZnAl 11 O 19 (LZAO: Cr 3+ ) phosphors are synthesized via a high-temperature solid-phase method. These phosphors exhibit NIR emission in the range of 650–900 nm, with the LZAO: 0.10Cr 3+ achieves an excellent internal quantum efficiency (IQE) of 89.9 %. Notably, it demonstrates excellent thermal stability, maintaining 97.2 % of the initial photoluminescence intensity at 513 K. Through co-doping with Nd 3+ , the NIR emission broadens across the 650–1100 nm range, and leads to a substantial enhancement in Nd 3+ emission intensity due to efficient Cr 3+ →Nd 3+ energy transfer. Remarkably, the optimum LZAO: Cr 3+ , Nd 3+ phosphor exhibits a high IQE (82 %) and an outstanding anti-thermal quenching behavior (118.0 % @ 513 K), with the underlying mechanism of its thermal stability further elucidated through defect level model. In addition, the synthesized phosphors show great promise for multifunctional applications in NIR phosphor-converted light emitting diodes, plant growth lighting, non-destructive testing, luminescence thermometry and solar cells.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ganggang Guo,Qiong Xi,Tao Yin,Jianju Nie,Yayuan Zhang,Li Guan,Zhenyang Liu,Fenghe Wang,Xu Li
Broadband near-infrared (NIR) phosphors are key materials for the preparation of NIR phosphor-converted light-emitting diodes (pc-LEDs). The wider coverage of the NIR spectrum means that more substances can be detected by NIR light and more applications are possible. However, ultra-broadband NIR phosphors with the full-width at half maximum (FWHM) greater than 200 nm still face challenges in terms of thermal stability as well as internal quantum efficiency (IQE). In this work, a series of La 2 CaTa x Zr (1- x ) O 6 (LCTZO): Cr 3+ phosphors was successfully synthesized by the high-temperature solid-phase method. The non-equivalent substitution strategy of Ta 5+ in place of Zr 4+ effectively modulates the crystal field environment of Cr 3+ and reduces the number of defects, thus modulating the luminescence properties of the phosphor. Under the 471 nm excitation, the spectrum of La 2 CaTa 0.3 Zr 0.7 O 6 : 2 % Cr 3+ can cover the 700–1400 nm band (FWHM = 201 nm) with IQE of 42.6 %, and the emission intensity can be maintained at 373 K at 74 % of that at room temperature . The prepared NIR pc-LED with ultra-wide spectral coverage shows better potential applications in the fields of night vision and biological tissue penetration.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 10
·5235-5243
·
IF 3.784
Qianqian Song,Zehua Liu,Hangjie Jiang,Zhaohua Luo,Peng Sun,Guoqiang Liu,Yongfu Liu,Haochuan Jiang,Jun Jiang
Phosphor-convert (pc) near-infrared (NIR) LED is the next-generation smart NIR light sources. Thus, NIR phosphors are quickly developed. The K 3 Al 1−x F 6 :xCr 3+ (KAF:Cr 3+ ) NIR phosphor shows broadband emission from 650 to 900 nm under 430 nm and can be used to fabricate NIR LEDs. In this work, KAF:Cr 3+ phosphors were prepared by a hydrothermal method for the first time. Morphologies and NIR properties are tuned by controlling the hydrothermal processes. Different from the cubic KAF:Cr 3+ synthesized by a coprecipitation method, KAF:Cr 3+ synthesized by the hydrothermal method shows the tetragonal phase. The optimized KAF:3%Cr 3+ shows an internal quantum efficiency of about 31.4%. A NIR pc-LED device was fabricated by integrating the KAF:3%Cr 3+ phosphor with a blue LED chip (~450 nm). The output power of NIR light is about 5.5 mW driven at 150 mA.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Liwei Zeng,Jiyou Zhong,Hongyao Liu,Weiren Zhao
Herein, we report a series of tunable and highly efficient Ga 1.594-2 x Sc 0.4 Mg x Ge x O 3 :0.006Cr 3+ phosphors via regulating the crystal field environment in (Ga,Sc) 2 O 3 :Cr 3+ system. This material exhibits a gradual red-shift of the emission spectra from 784 to 814 nm, and a spectral broadening with FWHM increased from 138 nm to 169 nm as the increase of x value. However, the position of excitation peak has almost no variations in the blue light region, enabling it to be perfectly matched with blue LED chip. Upon 450 nm excitation, the IQE remains above 90% when x ≤ 0.08 (784 ≤λ em ≤ 803 nm); while the thermal stability decreases as the increase of x in the whole range. Finally, a prototype NIR pc-LED was fabricated via combining Ga 1. 35 4 Sc 0.4 Mg 0.12 Ge 0.12 O 3 :Cr 3+ phosphor with 450 nm blue LED chip, which shows an excellent NIR output power of 26.91 mW with high photoelectronic conversion efficiency of 9.70% under a driving current of 100 mA. Thus, this work provided a series of efficient NIR phosphors through local structure regulation, which may have great potential for spectroscopy application.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Long Chen,Jiyou Zhong
Broadband near-infrared (NIR) phosphors are crucial components of NIR phosphor-converted light-emitting diode (pc-LED) sources for various smart spectroscopy applications. However, developing an efficient, tunable, and inexpensive broadband NIR phosphor with sufficient spectral coverage remains a great challenge. In this work, a cubic phosphate K2AlTi(PO4)3 with highly structural rigidity was chosen as host material for Cr3+ substitution to create an efficient NIR emission. Synthesizing this compound, the obtained material exhibits a broadband NIR emission covering 700–1200 nm with a peak wavelength ranging from 820 to 860 nm depending on the Cr3+ substituting concentration. The Cr3+ concentration optimized sample possesses a photoluminescence quantum yield (PLQY) of 76.4% with an emission peak centered at 857 nm and a full width at half-maximum (fwhm) of 184 nm under 464 nm exaction, demonstrating an efficient and relatively long-wavelength NIR emission with wide spectral coverage. This broadband NIR emission is mainly derived from a single kind of emission center deduced from spectral analysis, luminescence dynamics, and first-principle calculations. Using this material, the fabricated NIR pc-LED device presents an excellent NIR output power and NIR photoelectric conversion efficiency, making this material attractive in practical applications of night-vision and bioimaging. Therefore, this work not only provides a broadband NIR material with superiorities of low cost, high efficiency, wide-range tunability, wide spectral coverage, and relatively long-wavelength NIR emission for spectroscopy applications but also highlights some clues to discover this kind of materials.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiyou Zhong,Liwei Zeng,Weiren Zhao,Jakoah Brgoch
Broadband near-infrared (NIR) phosphors are in high demand for creating “smart” NIR phosphor-converted light-emitting diode (pc-LED) sources. In this work, a series of Cr3+-substituted NIR-emitting materials with highly efficient, broad, tunable emission spectra are achieved by modifying the simple oxide Ga2O3 using [Mg2+-Ge4+] and [Ga3+-Ga3+] co-unit substitution. The results show that the emission peak can be shifted from 726 to 830 nm while maintaining a constant excitation peak in the blue light region, enabling extensive application. The optical properties stem from changes in the Cr3+ crystal field environment upon substitution. Intriguingly, the temperature-dependent photoluminescence emission peak position shows virtually no change in the [Mg2+-Ge4+] co-substituted materials. This abnormal phenomenon is found to be a comprehensive embodiment of a weakening crystal field environment (red-shift) as the temperature increases and reduced local structure distortion (blue-shift) with increasing temperature. The high quantum yield, NIR emission, and net-zero emission shift as a function of temperature make this phosphor class optimal for device incorporation. As a result, their performance was studied by coating the phosphor on a 450 nm emitting LED chip. The fabricated device demonstrates an excellent NIR output power and NIR photoelectric conversion efficiency. This study provides a series of efficient, tunable, broadband NIR materials for spectroscopy applications and contributes to the basic foundation of Cr3+-activated NIR phosphors.
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Jia Yang,Yahong Jin
Broadband near-infrared (NIR) phosphors activated by Cr3+ are pivotal for next-generation NIR light sources, yet achieving long-wavelength NIR emission remains challenging. Herein, we report a strategy of tailoring spin-paired Cr3+ ion dimers in a spinel-type LiZn0.6Mg0.4SbO4 host to achieve extended broadband NIR emission. Heavy Cr3+ doping, inducing spin-paired Cr3+ ion dimers, coupled with crystal-field engineering shifts the original 709 nm narrow-band emission to 860 nm (via Mg2+ incorporation) and further to 970 nm broadband emission (via Ca2+ incorporation). The optimized phosphor exhibits a 1.8-fold enhancement in thermal stability and a 1.35-fold increase in internal quantum efficiency compared to its Mg-free counterpart. Fabricated NIR phosphor-converted light-emitting diode (pc-LED) delivers an output power of 40.97 mW at 750 mA, demonstrating promising potential in versatile photonics applications. This work provides a viable approach for designing broadband NIR phosphors through precise manipulation of exchange-coupled Cr3+ ion dimers.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xinying Luo,Yang Li,Yiqi Xu,Yue Zhong,Tao Su,Yile Li,Wenming Wang,Yan Pan,Yong Li
The expanding application of near-infrared (NIR) spectroscopy in fields such as bioimaging, night vision, and non-invasive analysis has generated an urgent demand for novel phosphors with ultrabroad emission bands and tunable optical properties. In this work, a series of Cr 3+ -doped Li 2 Mg 3 SnO 6 phosphors were synthesized via a conventional high-temperature solid-state reaction. Under blue light excitation, the phosphors exhibit ultrabroad NIR emission, which is attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ ions. The emission spectra can be effectively modulated by adjusting the Cr 3+ doping concentration. As the concentration increases from 0.1 to 1.5 mol%, the emission peak red-shifts from 725 to 798 nm, accompanied by a significant broadening of the full width at half maximum (FWHM) from 2267.4944 cm −1 to 3373.4350 cm −1 . This behavior indicates strong modulation of energy level splitting and crystal field strength. The optimal photoluminescence (PL) intensity is achieved at a Cr 3+ doping concentration of 0.5 mol%. Furthermore, the excitation spectra monitored at different emission wavelengths (702 and 766 nm) exhibit broad spectral region spanning from the ultraviolet to visible light, with a dominant excitation peak centered at approximately 450 nm, well matching the emission of commercial blue light-emitting diode (LED) chips. A NIR phosphor-converted LED (pc-LED) fabricated using the optimized phosphor demonstrates considerable potential for applications in bioimaging and night vision.
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Journal of Materials Chemistry C
·
2026
·
IF 5.1
Ruiyang Li,Yongfu Liu,Peng Sun,Jianrong Qiu,Jun Jiang
Achieving efficient and broadband near-infrared (NIR) emitting phosphors is a central challenge for advancing NIR phosphor-converted (pc) light-emitting diodes (LEDs) as next-generation smart light sources for spectroscopy. Co-doping represents a well-established strategy to enhance NIR phosphor performance through tailored energy transfer. Herein, we explore a NIR phosphor achieved by co-doping Ce3+ into CaLu2Mg2Si3O12:Cr3+ (CLMSG:Cr3+) and provide a systematic investigation of its photoluminescence properties and energy transfer (ET) mechanism. Under 450 nm excitation, CLMSG:Ce3+,Cr3+ exhibits a broad NIR emission band spanning 650 to 900 nm. Owing to the efficient ET from Ce3+ to Cr3+, the Cr3+ emission intensity is enhanced by approximately 130%. The fabricated NIR pc-LED devices emit bright NIR radiation (33.8 mW@200 mA), demonstrating potential for application in night vision and biological imaging technologies.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Weijie Yan,Tao Li,Peihong Shi,Zhaoqi Hu,Jinliang Huang,Wenfa Fang,Libin Xia
NIR pc-LEDs develop rapidly due to its spectral tunability and compact design. However, NIR phosphors with both high efficiency and superior thermal quenching resistance are scarce. In this study, a novel NASICON-type structure phosphate NaAlNb(PO 4 ) 3 :Cr 3+ phosphor was synthesized successfully. The crystal structures and the luminescence behaviors were systematically investigated. The phosphor exhibits a broadband NIR emission from 700 to 1100 nm, centered at 808 nm and with a full-width at half maximum (FWHM) of 131 nm. Owing to the high structural rigidity (Θ D = 624.9 K) and wide optical bandgap (E g = 4.1 eV), NaAlNb(PO 4 ) 3 :Cr 3+ shows a high internal quantum efficiency (IQE) of 87% and excellent thermal quenching resistance (retaining 84.19% of its room-temperature intensity at 373 K). A NIR pc-LED was fabricated by combining the as-prepared phosphor with a 460 nm blue LED chip, achieving a high photoelectric conversion efficiency of 18.37% and a strong NIR output power of 50.19 mW at a driving current of 100 mA. All results indicate the NaAlNb(PO 4 ) 3 :Cr 3+ is a promising phosphor for NIR light practical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Hai Yang,Song Ma,Shanshan Li,Yi Liu,Fuchao Wang,Zhuowei Li,Ge Zhu
Broadband near-infrared phosphor-converted LEDs (NIR pc-LEDs) are highly desirable for emerging spectroscopic applications. However, the simultaneous realization of long-wavelength emission and broad spectral coverage remains challenging. Herein, we report a novel Cr 3+ -activated phosphate phosphor SrHf 4 (PO 4 ) 6 : Cr 3+ that exhibits broadband NIR emission centered at 890 nm with a full width at half maximum of 162 nm under blue-light excitation. The red-shifted and broadened emission is enabled by a weak crystal-field environment and the dual-site occupation of Cr 3+ in the SrHf 4 (PO 4 ) 6 lattice. Structural analysis and electron paramagnetic resonance measurements indicate that Cr 3+ ions occupy both Sr 2+ and Hf 4+ sites, which is further supported by the emission-band deconvolution, wavelength-dependent lifetime analysis and formation-energy calculations. The thermal-quenching behavior is also investigated to clarify the non-radiative relaxation mechanism associated with electron-phonon coupling. Moreover, a prototype NIR pc-LED fabricated with the optimized phosphor delivers an output power of 57.4 mW and a photoelectric conversion efficiency of 5.1% at 350 mA, demonstrating its potential applications in non-destructive testing, information encryption and night-vision imaging. This work provides a structurally interpretable dual-site strategy for extending and broadening Cr 3+ NIR emission in phosphate hosts, offering guidance for the development of advanced broadband NIR light sources.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Xingen Tang,Linjie Wang,Zhijian Bu,Shengtao Wu,Zheng Tang,Xinyu Chen,Shuangquan Liu,Chen Li,Xiangheng Niu
Background Trivalent chromium (Cr 3+ ), a relatively environmentally benign and biologically beneficial species of chromium, is widely applied in manufacturing processes as well as in the food and healthcare industries. Exploring a convenient, dependable, and sensitive method for Cr 3+ monitoring becomes practically important for ensuring environmental health and food safety. Results In this study, a o -phosphoethanolamine-functionalized, sheet-like manganese-based nanozyme (OPA@MnT) with excellent oxidase-like activity was designed for sensitive and selective Cr 3+ sensing based on target-induced nanozyme crosslinking. The OPA functional group and nanosheet structure enable specific coordination with Cr 3+ via nitrogen and oxygen donors, triggering aggregation of OPA@MnT and a reduction in active oxygen vacancies, both of which effectively suppress its catalytic activity. Based on this mechanism, a facile colorimetric sensing strategy was established, exhibiting a wide linear detection range (0.25–10 μM), a low detection limit (0.15 μM), and selectivity against potential interfering species. The method was successfully applied to environmental water and dietary supplement samples, showing good agreement with standard ICP-MS measurements. Significance Our work provides a simple, sensitive, and reliable strategy for Cr 3+ monitoring with promising applications in environmental analysis and food safety assessment. Moreover, the elucidated interaction mechanism between metal ions and nanozymes offers valuable insights for the rational design of nanozyme-based sensing platforms for broader analytical applications.
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高影响因子
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