MATERIALS LETTERS
·
2023
·
IF 3
Changhai Zhang,Guoqiang Yi,Zaichun Sun,Bingchu Mei
Cr 3+ has attracted much attention as activator because of the merits such as, broadband near-infrared emission and tunable emission wavelength. However, the mixed valence of Cr 3+ in some matrix materials greatly affected its luminescence. In this work, we synthesized Cr 3+ doped CaF 2 (CaF 2 :Cr 3+ ) precursor powders with a single valence of Cr 3+ ion by coprecipitation and successfully prepared CaF 2 :Cr 3+ transparent ceramics by vacuum hot-press sintering. The obtained ceramics showed high transmittance with 83% at 1200 nm and effective broadband near-infrared emission covering 680–980 nm with a full width at half-maximum (FWHM) of 130 nm. Moreover, the photoluminescence properties of ceramics were tuned by the concentration of Cr 3+ ions.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 9
·4577-4584
·
IF 3.784
Tianyao Liu,Hao Cai,Ning Mao,Zhen Song,Quanlin Liu
Broadband near-infrared phosphors are essential to realize nondestructive analysis in food industry and biomedical areas. Efficient long-wavelength (>830 nm) phosphors are strongly desired for practical applications. Herein, we demonstrate an efficient broadband NIR phosphor LiInGe 2 O 6 :Cr 3+ , which exhibits a broad NIR emission peaking at ~880 nm with a full width at half maximum of 172 nm upon 460 nm excitation. The internal/external quantum efficiencies of LiInGe 2 O 6 :Cr 3+ are measured to be 81.2% and 39.8%, respectively. The absorption of the phosphor matches well with commercial blue LEDs. Using the fabricated phosphor converted LED illuminating human palm, distribution of blood vessels can be clearly recognized under a NIR camera. These results indicate that LiInGe 2 O 6 :Cr 3+ is a promising candidate to be used in future non-destructive biological applications.
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高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 3
·981-990
·
IF 3.074
Tao Long,Xiaomeng Yin,Hui Lin,Cheng Zou,Dawei Zhang,Songlin Zhuang
Cr3+ doped Ba0.75Al11O17.25 red luminescent phosphors were synthesized and densified into ceramics by spark plasma sintering. Under the 405 nm excitation, the phosphors present a narrow band emission peaked at 704 nm and the highest emission intensity when the doping concentration of Cr3+ is 3%. When the temperature reaches 205 °C, the integrated emission intensity of the red emission can still reach 88% of the counterpart at room temperature, showing good luminescence thermal stability. The thermal conductivity of the ceramics is 4.87 W/(m·K) at room temperature, which is good for heat release under high power/high brightness excitations.
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DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Fengxia Zou,Ming Li,Zengyan Du,Yi Song,Liang Li,Guanghai Li
In modern agriculture, light plays an important role in plant growth. Far red light controls the whole growth process of plants from germination to vegetative growth to flowering. Here, we report the preparation and photoluminescence (PL) performance of Cr,Bi co-doped SrGdAlO 4 phosphors by solution combustion method. The SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors exhibit far red broadband PL of 660–780 nm excited at 458 nm, and the maximum emission peak position is at 713 nm. It was found Cr 3+ and Bi 3+ replaced the positions of Al 3+ and Gd 3+ in the host material, respectively. The PL performance of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors mainly depends on the 2 E 2 → 4 A 2 transition of Cr 3+ , and the addition of Bi 3+ can effectively enhance the PL intensity of the phosphors. Notably, the SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors also exhibit obvious far red PL when coated onto glass substrate or mixed with plastics without affecting their visible light transmission. We believe our work will excite interests in further exploring the practical application of SrGdAlO 4 :Cr 3+ ,Bi 3+ phosphors as plant growth regulator in greenhouse.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yue Su,Lifang Yuan,Hai Liu,Guangting Xiong,Haoyi Wu,Yihua Hu,Xuxin Cheng,Yahong Jin
The near-infrared (NIR) light source has a huge potential for foodstuff analysis, biometric identification, physiological monitoring, and night vision technology with real-time and non-destructive advantages. Demand-led growth impels the exploration of novel NIR phosphors with broadband emission. Here we report a new kind of blue-light excitable NIR phosphor Mg 7 Ga 2 GeO 12 : xCr 3+ , in which the multi-site occupation of Cr 3+ induces broadband NIR emission in the range of 600–1200 nm with a large full width at half maximum (FWHM) of ~190 nm and a NIR photoluminescence quantum yield (PLQY) of 12.06% at x = 0.02. The FWHM can be effectively adjusted from 101 to 226 nm via multisite occupancy preference of Cr 3+ ions. The PL intensity remains ~50% and nearly 100% of the initial level after heated up to 400 K and immersed in hot water (100 °C) for 24 h, respectively, demonstrating good thermal stability and robust chemical stability. The broadband emission originated from multi-site PL centers of Cr 3+ is discussed in detail by the temperature-dependent PL behaviors and PL decay lifetime. Finally, a broadband emission NIR-LED is fabricated, based on which a proof-of-concept application for night vision is demonstrated. This work not only provides a strategy for the design and developing of novel broadband NIR phosphors, but also indicates the potential for various advanced spectroscopy applications.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12892-12898
·
IF 4
Chaojie Li,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Rapid, non-destructive food-quality analysis using near-infrared (NIR) photoluminescence spectroscopy produced by phosphor-converted light-emitting diodes (pc-LEDs) has fascinating prospects for future food-safety monitoring. However, covering the energy window for organic molecular vibrations of interest in these applications requires NIR-emitting phosphors that are highly energy-efficient with ultra-broadband photoluminescence. This remains a materials design challenge. Here, a Cr3+-substituted garnet phosphor, Mg3Gd2Ge3O12, is found to possess a desired broadband NIR emission (λem = 815 nm, fwhm = 172 nm; 2513 cm−1) covering from 700 nm to 1200 nm with a photoluminescence quantum yield of 60.8% and absorption efficiency of 44.1% (λex = 450 nm). Fabricating a prototype NIR pc-LED device using the title material combined with a 455 nm emitting InGaN LED chip produces a NIR output power of 23.2 mW with photoelectric efficiency of 8.45% under a 100 mA driving current. This NIR light source is then used to demonstrate the quantitative detection of ethanol in solution. These results highlight the feasibility of this material for NIR spectroscopy and validate the prospects of using NIR pc-LEDs in food-quality analysis.
研究领域:
分析化学
·
食品科学
·
光电子材料
·
分子光谱学
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食品安全
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材料科学
·
光学传感
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yan Hao,Shen Wang,Yibo Zhang
MgAl 2 O 4 : Cr 3+ transparent ceramics were synthesized by hot pressing (HP) technique, LiF and Y 2 O 3 as sinter aids. The effect of Cr 3+ on the densification, structure, and luminescence of MgAl 2 O 4 transparent ceramic was studied. The phase structure, micromorphology, and photoluminescence were analyzed by using an x-ray diffractometer, field emission scanning electron microscope, energy-dispersive X-ray spectroscopy, excitation, emission spectra, quantum yield, and decay curves. The results showed that the relative density of the ceramic increased from 99% to 99.45% with the increase of Cr 3+ content, meanwhile, more Al 3+ sites were occupied by Cr 3+ ions, and the Y 3+ ion in the sinter aids gathered at the grain boundary, which caused the decrease of the optical transmittance. The relative density of the ceramic with 0.12 mol% Cr 3+ is 99.17%, and its optical transmittance was above 67% in the range of 700–6000 nm, and the highest was 74% at 1440 nm. The characteristic R-line centered at 686 nm, and the N-line centered at 700 nm of Cr 3+ ions were observed. The quantum yield of the R-line was improved with the increase of x and reached 35.8% at Cr 3+ content of 0.37%. Additionally, with the increase of Cr 3+ content, the Dq/B value increased from 3.19 to 3.31.
研究领域:
材料科学
·
陶瓷
·
光学材料
·
光致发光
·
固体物理
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hongshi Zhang,Jiyou Zhong,Chaojie Li,Ligen Wang,Weiren Zhao
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) has demonstrated its advantages of convenience, fast, and non-destructive in spectroscopy applications. As a crucial component of NIR pc-LED, the NIR phosphor is required to be efficient, and inexpensive. However, most of the currently developed NIR phosphors contain the expensive elements. Herein, an efficient, thermally stable, and inexpensive NaAlP 2 O 7 :Cr 3+ broadband NIR phosphor was synthesized. The crystal and electronic structures were analyzed, as well as the luminescent and fabrication properties were investigated. The results show that the emission spectra of this material covers 700–1100 nm with a peak locating at 790 nm under 450 nm excitation. The photoluminescence quantum yield (PLQY) was measured to be 49.7%, and the emission intensity at 423 K maintains 80.6% of that at 298 K. In addition, a fabricated NIR pc-LED device was used to evaluate the practical applications, which exhibits a high output power of 21.4 mW under a driving current of 100 mA. Using this light source , the applications in night vision and information hiding were demonstrated. These results indicate the feasibility of NaAlP 2 O 7 :Cr 3+ as a candidate NIR material for spectroscopy applications.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光谱学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2024
·
IF 2.6
Kang Cheng,Weichao Huang,Xinyong Gong,Chaoyong Deng
The Cr 3 + -activated phosphor can emit far-red light under the excitation of an external light source, mainly due to the transition of the outermost electrons of Cr 3 + from the 2 E level to the 4 A 2 level in a strong crystal field environment. A novel far-red Li 2 TiO 3 : Cr 3 + phosphor was prepared by the solid-state method. Under the excitation of 356 nm, the Li 2 TiO 3 : Cr 3 + phosphors emit intense far-red light in 600–850 nm with a central wavelength of 732 nm. The emission band of all samples was matched with the absorption bands of phytochrome P F R . The experimental data and theoretical calculation confirmed that Cr 3 + is surrounded by a strong crystal field environment. The effect of Cr 3 + doping concentration on the luminescence intensity was analyzed. These research works demonstrate that far-red Li 2 TiO 3 : Cr 3 + phosphors have potential applications in plant growth lights.
研究领域:
材料科学
·
光学材料
·
植物生理学
·
光子学
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DOI
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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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.6
Dejian Hou,Jianhong Dong,Rui Huang,Huihong Lin,Shaomin Lin,Yi Zhang,Zhenxu Lin,Huan Yang,Hailong Liu,Jinyan Li
Multiple-emission phosphors, which can be engineered via co-doping strategies and energy transfer regulation, have become a research hotspot in recent years. In this research, Mn 2+ and Cr 3+ doped Sr 2 MgAl 22 O 36 phosphors were prepared using a high-temperature solid-state reaction method. The green light emission of Mn 2+ and the deep-red emission of Cr 3+ were investigated, and the impacts of doping concentration and temperature were discussed in detail. Dual-band emission can be achieved for co-doped samples under blue light excitation, and the energy transfer from Mn 2+ to Cr 3+ was confirmed. Owing to the distinct temperature responses of Mn 2+ and Cr 3+ , optical temperature sensing properties were demonstrated for the co-doped sample, which may offer a feasible approach for non-contact temperature measurement. Moreover, a triple-emission phosphor-converted light-emitting diode (pc-LED) device was fabricated, highlighting the potential application of Sr 2 MgAl 22 O 36 :Mn 2+ ,Cr 3+ in plant growth.
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产品关联
DOI
高影响因子
Microstructures
·
2026
·Vol. 6
·期 4
·N
·
IF 8.5
Qi’an Zhang\u003Csup\u003E1,\u003C\u002Fsup\u003E,Ziyi Fang\u003Csup\u003E1,\u003C\u002Fsup\u003E,Mingzhi Wu\u003Csup\u003E1\u003C\u002Fsup\u003E,Yang Liu\u003Csup\u003E1\u003C\u002Fsup\u003E,Qidong Ma\u003Csup\u003E1\u003C\u002Fsup\u003E,Jiazhen Zhou\u003Csup\u003E1\u003C\u002Fsup\u003E,Shengqiang Liu\u003Csup\u003E1\u003C\u002Fsup\u003E,Dengfeng Peng\u003Csup\u003E1,2,3\u003C\u002Fsup\u003E
The development of high-performance self-recoverable near-infrared (NIR) mechanoluminescent materials is crucial for advancing applications. In this work, we presented a self-recoverable NIR mechanoluminescent material, platelike SrAl12O19, through singly doped with Cr3+ and co-doped with lanthanide ions (Nd3+, Yb3+, Er3+) in one step. By modulating the Cr3+ doping concentration, we achieved precise control over the mechanoluminescence (ML) intensity as well as the spectral tunability between characteristic R-line emission (~ 690 nm) and the broadband emission (750-950 nm). Moreover, energy transfer from Cr3+ to lanthanide ions enables multispectral ML emission extending into the NIR-II window (1,000-1,700 nm). The resultant material exhibits excellent ML self-recoverability and high chemical stability. The co-doped system was demonstrated with great potential in dynamic stress visualization, naked-eye-invisible information encryption and special identification under challenging conditions (e.g., underwater). We further demonstrated practical applications by fabricating dual-mode flexible NIR mechanoluminescent paper sheets and sprayable coatings. This work contributes to the advancement of new NIR mechanoluminescent materials with unique morphological features for various scenarios, including the advancement of intelligent sensing and multi-level anti-counterfeiting technologies.
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高影响因子
危险品化学品经营许可证（带存储）