JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Jie Wang,Xirong Huang,Yinfei Liu,Feifei Huang,Renguang Ye,Hongping Ma,Youjie Hua,Shiqing Xu
Plant photosynthesis relies on photosynthetic pigments to absorb red and far-red light. Cr 3+ -doped ZnAl 2 O 4 exhibits superior red-light emission, holding great potential for plant illumination. Nevertheless, the luminescence efficiency of nanocrystalline glass-ceramics is limited by their crystal size. To address this issue, in this study, Cr 3+ -doped micron-sized ZnAl 2 O 4 devitrified glasses were fabricated via a cooling-induced self-crystallization method. Cr 3+ incorporation simultaneously modulates the crystallization kinetics of the devitrified glasses and significantly enhances the luminescent properties. The maximum luminescence intensity was obtained at the Cr 3+ doping concentration of 0.1 mol%. Notably, the as-prepared devitrified glasses retain approximately 84% of its room-temperature photoluminescence intensity, even at an elevated temperature of 150 ℃. The emission peak of the ZnAl 2 O 4 : Cr 3+ devitrified glasses in the red spectral region closely matches the absorption spectrum of phytochrome far-red, effectively satisfying the red-light requirement for plant photosynthesis. Electroluminescence (EL) characterization confirms its suitability for plant lighting applications. This work is of great significance for promoting the development of the plant lighting industry.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Yunyi Lu,Chenqi Kang,Zhenxiang Ye,Lehui Liu,Feifei Yuan,Yisheng Huang,Lizhen Zhang,Zhoubin Lin
This paper presents a method that employs charge compensation to effectively enhance the spectral, mechanical, and thermal properties of Cr 3+ : Ca 3 (VO 4 ) 2 (Cr:CVO) crystals. Due to doping with heterovalent ions, a significant number of oxygen vacancies are present in the Cr:CVO crystals, resulting in strong self-absorption and suppression of emission at 842 nm. To address this issue, Li + ions were introduced as charge compensators. When the concentration of Li + ions reached 5 at%, self-absorption was most effectively suppressed, and the emission at 842 nm was significantly enhanced. Additionally, the mechanical and thermal properties of the crystal are significantly improved. The XPS research results indicate that changes in the color, spectra, and physical properties of Cr:CVO crystals primarily depend on the relative concentration of oxygen vacancies within them. Both annealing and the introduction of Li + ions effectively reduce the high concentration of oxygen vacancies in Cr:CVO crystals. However, the strategy of Li + ion charge compensation is more effective than annealing in comprehensively enhancing the overall performance of Cr:CVO crystals. This study presents an effective strategy for defect regulation and performance optimization in Cr 3+ -doped oxide laser crystals.
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Juhang Liang,Xinxin Han,Hengjuan Deng,Shasha Wang,Dongxi Liu,Kui Zhang,Bingsuo Zou
The development of efficient and thermally stable near-infrared (NIR) phosphors is crucial for advancing next-generation smart NIR lighting sources, yet remains a formidable challenge. Herein, we report a high-performance K 2 NaAlF 6 :Mn 4+ ,Cr 3+ phosphor engineered via an efficient energy transfer strategy. The optimized phosphor exhibits a dominant NIR emission peak at 725 nm and achieves an exceptional energy transfer efficiency of 87.5 % from Mn 4+ to Cr 3+ . This efficient energy transfer, combined with the enhanced Cr 3+ absorption, contributes to a 91 % enhancement in NIR emission intensity and an increase in internal quantum efficiency from 74.0 % to 82.7 %. Meanwhile, the thermal stability is also significantly improved, with the co-doping sample retaining 83.4 % of its emission intensity at 425 K compared with 73.6 % for the singly Cr 3+ -doped counterpart, which is attributed to the enhanced lattice rigidity and the energy transfer process induced by Mn 4+ doping. A NIR phosphor-converted light-emitting diode (NIR pc-LED) fabricated with this phosphor and a blue chip demonstrates outstanding performance in applications of bioimaging, non-destructive testing and night vision imaging. Furthermore, its outstanding scintillation properties also enable high-resolution X-ray imaging. This work establishes a feasible design strategy for developing advanced multifunctional NIR luminescent materials that simultaneously achieve high efficiency and excellent thermal stability.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ye Wang,Zhijun Wang,Guohui Wei,Yuanbo Yang,Shaoxuan He,Jiehong Li,Yawei Shi,Rui Li,Jiawei Zhang,Panlai Li
The rapid development of portable spectroscopic detectors has given rise to a great demand for small light sources, and near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are preferred for their compactness and low cost, while phosphors used in NIR spectroscopy require broadband emission, high quantum yield and good absorption efficiency as well as the spectral range required to achieve detection. Inspired by the tunable structure of Gd 3 Ga 5 O 12 (GGG), a series of broadband phosphors Gd 3 Zn x Ga 5-2 x Ge x O 12 :1.5%Cr 3+ ( x = 0–2.0) with continuously tunable emission in the long-wave direction were designed using Zn 2+ -Ge 4+ instead of Ga 3+ -Ga 3+ in GGG to modulate the crystal field environment of Cr 3+ . The crystal field intensity of the octahedra occupied by Cr 3+ decreases with increasing co-substitution, and its full-width at half maximum (FWHM) from 105 nm to a maximum of 211 nm due to the change of local symmetry. In Gd 3 Zn 0.8 Ga 3.4 Ge 0.8 O 12 (GZGG):5%Cr 3+ , the internal quantum yield (IQY) and external quantum yield (EQY) reaches 79.6% and 31.2% with impressive absorption efficiency (41.1%). The obtained phosphors were made into pc-LED with blue light chips, which was applied to glucose solution degree detection. The results show that the GZGG:Cr 3+ will hopefully provide a new strategy for non-destructive testing.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yi Zhang,Zhexuan Gao,Yinyan Li,Huanping Wang,Shilong Zhao,Yang Shen,Degang Deng,Shiqing Xu,Hua Yu
Here, near-infrared broad dual-band emission phosphors were achieved through energy transfer between Cr3+ and Ni2+ ions in the β-Ga2O3 host. All samples co-doped with Cr3+ and Ni2+ exhibit dual-band emission covering 600–1700 nm under 430 nm excitation. Thanks to the doping of Cr3+ ions, the emission intensity of Ga2O3:Cr3+, Ni2+ phosphors has increased by about 2.4 times and the internal quantum efficiency has increased by 83.2% compared to Ga2O3:Ni2+ phosphors. Meanwhile, when the fluorescence lifetime was monitored at 745 nm, an efficient energy transfer between Cr3+ and Ni2+ ions in the β-Ga2O3 host was verified. Due to the significant differences in the emission temperature-sensitive properties of Cr3+ and Ni2+ ions, a thermometer was designed utilizing fluorescence intensity ratio technology, achieving a maximum relative sensitivity of 5.26% K–1, which surpasses most optical temperature measurement phosphors. This suggests that Ga2O3:Cr3+, Ni2+ samples hold promise as potential candidates for optical thermometer materials. Additionally, the broadband near-infrared emission of the Ga2O3:Cr3+, Ni2+ sample has been investigated for potential applications in component analysis and night vision, demonstrating its versatility for multifunctional applications.
研究领域:
材料科学
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光学传感器
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发光材料
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固体物理
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近红外成像
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 10
·1585
·
IF 5.1
Yu Zhang,Yinying Zhang,Min Liu,Lifen Meng
The development of cost-effective, eco-friendly, sensitive, and efficient analytical platforms for the monitoring of metal ions holds profound practical value. In this work,edible funguscarbon quantum dots (Ef-CQDs) are synthesized via a facile hydrothermal route usingedible fungusas a green carbon precursor, and a novel fluorescence sensing strategy is established for the rapid and selective detection of Cr3+in environmental water matrices. Systematic optical investigations revealed that the as-preparedEf-CQDsdisplayed outstanding selectivity toward Cr3+over other coexisting metal ions. Meanwhile, theEf-CQDsexhibited considerable scavenging activity toward hydroxyl radicals and DPPH radicals, endowing them with favorable antioxidant performance. When applied for Cr3+determination in real environmental water samples, the proposedEf-CQDsachieved satisfactory spiked recoveries ranging from 95.2% to 100.6%. This study provided a promising and sustainable approach for the green, rapid, and reliable monitoring of Cr3+in complex aqueous environments.
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PubMed
高影响因子
Surfaces and Interfaces
·
2022
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IF 6.137
Iltaf Khan,Aihua Yuan,Aftab Khan,Shoaib Khan,Sohail Khan,Sayyar Ali Shah,Waleed Yaseen,Yanjuan Cui,Xiaoping Shen,Xuyu Wang
In this novel research work, Cr 3+ incorporated and TiO 2 -modified porous SmFeO 3 -based nanocomposites are prepared via utilizing carbon nanosphere (CNS) as a hard template. Our experimental results proved that the introduction of porosity by employing a sequential template approach (STA) has upgraded the performances of SmFeO 3 nanoparticles. Remarkably, the incorporation of Cr 3+ increased the light absorption capability by generating surface states and regulating band gap positions, whereas the fabrication of TiO 2 enlarged surface area and enhanced charge separation by modulating high-level energy electrons (HLEEs). According to our experimental techniques, including TEM, HRTEM, SEM, TGA, BET, PEC, FS, and PL, it is demonstrated that most optimal 6Cr-PSFO and 4TiO 2 /6Cr-PSFO nanocomposites have high porosity, appropriate bandgap positions, large surface area, and show superior visible-light photocatalytic activities compared to pristine SmFeO 3 nanoparticles. Compared to pristine SFO, the activities of most active 4TiO 2 /6Cr-PSFO nanocomposites are improved by 8-fold for CO 2 conversion and 3-times for 4-chlorophenol (4-CP) degradation. The radical trapping experiment confirmed that the · OH i are the most active species and has a vital role in the photocatalytic degradation of 4-CP. Moreover, our experimental results are verified and consistent with theoretical calculations and computational studies. Finally, our research work will open up a new gateway for the designing of novel porous SmFeO 3 -based nanocomposites and their use in CO 2 conversion and pollutant removal.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 15
·5829-5839
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IF 8.067
Cheng Zhou,Lu Peng,Zihui Kong,Meihan Wu,Maxim S. Molokeev,Zhi Zhou,Jing Wang,Mao Xia
Cationic substitution is a common material modification strategy. Generally, it follows the principles of radius matching, valency equilibrium and stoichiometric substitution. However, radius-mismatched, nonstoichiometric-ratio ion substitution can achieve unexpected experimental results. Such unexpected results are very important for expanding the research of materials, but the modification mechanism is still unclear. In this work, the optical performance of ZnGa2O4:0.02Cr3+ (ZGO:0.02Cr3+) is effectively regulated by chemical unit cosubstitution (Ge4+–Li+/Na+ for Ga3+–Zn2+) and excess cation substitution synergetic strategies, and the thermal stability is retained at 97.7% at room temperature and 150 °C. Ge4+–Li+ and Ge4+–Na+ replace the lattice position of Ga3+–Zn2+ to enhance the photoluminescence (PL) intensity and quantum efficiency (QE) of ZGO:0.02Cr3+. The optimal doping contents of Ge4+–Li+ and Ge4+–Na+ are all 0.3 mol (PL intensity is 130.3% and 153.4% and QE = 77.4% and 85.1%). With further addition of Li+ ions, the emission intensity and QE continued to increase to 176.4% and 83.8%, respectively. The synergistic effect of the mechanism on optical properties is explained via Rietveld refinement, optical band gap energy and thermoluminescence. Finally, LED devices were fabricated by using the ZGO:0.02Cr3+,0.03Ge4+,0.11Li+ phosphor to investigate the effect on plant growth. The growth period was reduced and the fruit quality was improved in dwarf potted tomato, which shows the application prospect in plant growth of the ZGO:0.02Cr3+ phosphor.
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Laser & Photonics Reviews
·
2021
·Vol. 16
·期 2
·2100459
·
IF 13.138
Qianqian Zhang,Dongjie Liu,Peipei Dang,Hongzhou Lian,Guogang Li,Jun Lin
Achieving ultra-broadband and tunable photoluminescence of near-infrared (NIR) emitting phosphors is a key challenge for realizing its multi-applications. Here, a series of new ABO 4 :Cr 3+` (A 3+ = Ga, Sc, In; B 5+ = Ta, Nb) NIR-emitting phosphors with unprecedented tunable photoluminescence based on crystallographic site engineering and crystal field regulation is reported. Large spectral tuning from NIR-I to NIR-II is realized with the peak position varying from 825 to 1025 nm, by cation substitution with decreasing crystal field strength. Broadened full-width at half maximum from 125 to 231 nm can be tailored by controlling the occupancy of Cr 3+ on two different sites. Potential multi-applications of the tunable NIR emitting phosphors are proposed and validated in NIR spectroscopy detection, night vision, penetrating biology tissue, and so on. This work demonstrates that crystallographic site engineering can effectively tune the NIR optical properties of Cr 3+ -doped phosphor materials for multi-photoelectric applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoman Shi,Huimin Li,Ran Pang,Mekhrdod S. Kurboniyon,Lihong Jiang,Da Li,Su Zhang,Hongjie Zhang
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) can enable material identification by leveraging the absorption differences of specific functional groups (e.g., C-H and O-H) in the NIR region. The basic requirement for organics detection of NIR pc-LEDs is broadband emission that covers the strong absorption range of the functional groups. This work reports a new double perovskite matrix Cr 3+ -doped BaLaMgTaO 6 (BLMTO:Cr 3+ ) with 800 nm - 1200 nm broadband NIR emission upon 467 nm excitation, effectively covering the absorption regions of C-H and O-H bonds. Utilizing the first-principles calculations, crystal field theory and a variety of characterization methods, the spectral properties, the site occupancy of Cr 3+ and the temperature and concentration dependent spectra are fully demonstrated. Notably, by introducing Li + as a charge compensator, the spectra emission intensity increased to 1.67 times and the QY enhanced to 1.36 times. It is speculated that the intervention of Li + may make the charge balance after 2Cr 3+ → Mg 2+ + Ta 5+ substitution and form a more stable lattice environment. Finally, the NIR pc-LEDs assembled with BLMTO:Cr 3+ , Li + enables multi-applications in organic solution detection, biological imaging and night vision, paving the way for the development and application of multifunctional NIR pc-LEDs.
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高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300784
·
IF 11
Taoze Wang,Yuzhen Wang,Weibin Chen,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) lighting sources are applied in non-destructive examination and illumination supplements for night monitoring. As a critical component of NIR pc-LED, NIR phosphors are required to possess a high external quantum efficiency (EQE), super thermal stability, and broadband emission to meet applications. Here, Na 2 SrGe 6 O 14 :Cr 3+ (NSGO:Cr) glass ceramics (GC) bulk via highly crystallization from glass precursor is fabricated and demonstrates an ultrabroad emission band centered at 815 nm with a full width at half-maximum (FWHM) of 214 nm and a high EQE of 49.2%. Moreover, Yb 3+ co-doping significantly enhances Cr 3+ → Yb 3+ energy transfer (ET) due to the stronger Yb 3+ : 2 F 7/2 - 2 F 5/2 absorption. Benefiting from the ET process, the Cr/Yb co-doped GC exhibits NIR-I/II emission with improved thermal stability from 30.1% to 65.0%. Furthermore, an encapsulant-free NIR GC-converted LED (GCc-LED) is prepared and exhibits 52.2 mW NIR output power with a high photoelectric conversion efficiency (PCE) of 19.4%. Under a large current of 600 mA, the NIR device exhibits a watt-level output power of 922.4 mW with a PCE of 9.1%. Compared to conventional NIR powder phosphors, NSGO:Cr/Yb GC with high performance can open up an avenue for the fabrication of high power NIR lighting sources.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12189-12195
·
IF 7.059
Jun Zhou,Zhiguo Xia,Xiong Li,Xiangyan Yun,Jiayue Sun,Denghui Xu
The development of new luminescent materials with up-conversion (UC) emission falling within the first biological window (650–1000 nm) has drawn extensive attention in biological and medical fields. In this work, LiGaW2O8:Yb3+, Cr3+ UC phosphors were prepared for the first time, and the near-infrared (NIR) emission assigned to the 4T2–4A2 transition of Cr3+ was found to derive from the cooperative sensitization mechanism from Yb3+ to Cr3+. Moreover, the NIR emission of Cr3+ in the range of 700–900 nm can be greatly enhanced by the energy transfer (ET) process from Yb3+ sensitizers to Ho3+/Er3+ bridging centers and finally to Cr3+ emitting centers. Such success in LiGaW2O8:Yb3+, Ho3+/Er3+, Cr3+ provides a new perspective for designing superior UC phosphors with appropriate NIR emission, which could be used in biomedical fields.
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高影响因子
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