CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiao-Na Shen,Yu-Guo Yang,Wei Zhao,Xu-Ping Wang,Yuan-Yuan Zhang,Bing Liu,Hua-Jian Yu,Cheng-Cheng Qiu,Xian-Shun Lv,Rui Zhang,Lei Wei,Hua-Di Zhang
Phosphor-converted near-infrared light-emitting diodes (pc-NIR-LEDs) exhibit unique advantages over traditional NIR light sources, shifting the research focus toward high-performance NIR phosphors. The transition metal Cr 3+ ion serves as an ideal NIR activator, displaying highly sensitive emission characteristics that are strongly influenced by the primary crystal field environment. However, reports on Cr 3+ doping in SrLaGaO 4 (SLG) with a disordered structure as the host material remain limited. This study focuses on the synthesis of SrLaGa 1-x O 4 :x%Cr 3+ phosphors, where x ranges from 0.2 to 1.2. The optimized SLG:Cr 3+ phosphor demonstrates ultra-wideband NIR emission spanning from 650 to 1250 nm under excitation at 429 nm. Notably, the material exhibits superior thermal stability (ΔE = 0.35 eV, E G = 5.17 eV), retaining 66.55 % emission intensity at 423 K. Detailed optical analysis reveals that the emission from Cr 3+ -Cr 3+ ion pairs during the ( 4 A 2 , 4 T 2 → 4 A 2 , 4 A 2 ) transitions results in non-uniform broadening of the optical transition, which is one of the key factors contributing to its superior NIR performance. The output power of the pc-NIR-LED based on the SLG 0.99 :1.0 % Cr 3+ and 430 nm chip reached 0.418 W@150 mA. The results suggest that the novel SLG:Cr 3+ phosphor holds great prospects for advancing NIR lighting technology.
研究领域:
材料科学
·
光学物理
·
固态照明
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 19
·6536-6548
·
IF 6.1
Wen Song,Kaiwen Zhang,Xiaoyi Dong,Liang Xu,Yongjin Li,Rui Hu,Zhaoyi Yin,Zhengwen Yang,Jianbei Qiu,Zhiguo Song
Realizing efficient long-wavelength near-infrared (NIR) emission of Cr3+ ions is still a challenge in spinel-based phosphors due to the limitations of strong crystal fields. Here, we propose three design strategies for obtaining weak crystal fields in spinel-type crystals, and report for the first time designed Cr-activated LiZnNbO4 (LZNO) crystals with unique weak crystal fields and application of an NIR enhancement strategy via heterotopic and heterovalent doping with trivalent rare earth ions. Under irradiation with 468 nm blue light, the phosphor presents ultra-wideband NIR emission centered at 800 nm covering the region of 650–1300 nm, which is attributed to the larger radius, high valence state of cations and the low symmetry of octahedral sites in the LZNO spinel. Supported by XRD refinement, XPS analysis, and density functional theory (DFT) calculation results, it was shown that when Er3+ ions are designedly doped with the Zn2+ sites of the spinel crystals, effective promotion of the valence state transformation of Cr4+ to Cr3+ in the LZNO:Cr3+ system is achieved by defect charge compensation, and this enhances the NIR emission by nearly 3 times. The results of this work not only enrich the material family of Cr3+-activated NIR emitting phosphors, but also offer a novel and simple method for improving the luminescence efficiency of Cr3+-activated phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Shifang Wang,Mingzheng Sun,Xiaolang Fan,Bowei Liu,Chuangchuang Qiao,Shuang Jing,Xufeng Zhou,Wei Li,Yangbo Wang,Huaiyong Li
Broad band near-infrared emitting phosphors activated with Cr 3+ ions have great potential in a variety of applications. The luminescence efficiency and thermal stability are two critical parameters that are highly concerned in practical applications. In this work, a series of Cr 3+ ion-activated Ca 9 Ga(PO 4 ) x (VO 4 ) 7-x were synthesized. The photoluminescence (PL) properties of Cr 3+ were studied as functions of coordination environment, Cr 3+ concentration and temperature. The coordination environment of Cr 3+ ions is modified by gradually substitution of P by V without change the crystal structure of the host lattice. A continuous solid solution is formed, and the cell parameters and volume increase monotonically with V content. Great improvement in the intensity is observed for Ca 9 Ga(PO 4 ) 3.5 (VO 4 ) 3.5 , which increases by 26 and 2.4 times than the parents compositions Ca 9 Ga(PO 4 ) 7 and Ca 9 Ga(VO 4 ) 7 , respectively. Decay dynamic analysis suggests that both coordination environment modification and reduction of quenching center responsible for the great enhancement. An optimized concentration of 3.0 % is revealed and the intensity at 433 K maintains 81.1 % of the intensity at 293 K, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 27
·2214497
·
IF 19
Zhichao Liu,Xue Yu,Qingpeng Peng,Xiaodie Zhu,Jianqiang Xiao,Jiangtao Xu,Shouxiang Jiang,Jianbei Qiu,Xuhui Xu
Mechanoluminescence (ML) materials with long-wavelength emission bands are essential for future in vivo bioimaging, non-destructive testing of solids, etc. The lack of a defined mechanism, however, prevents the application of near infrared ML materials above 650 nm in several new fields. Here, the addition of Ga 3+ ions to Y 3 Al 5 O 12 : Cr 3+ manipulates matrix microstructure evolution, boosting near-infrared (NIR) zero-phonon line (ZPL) stress optical output of the Cr 3+ ion at 688 nm. The key factor changing the crystal field intensity D q /B due to the addition of Ga 3+ ions is what causes the luminescence amplification of ZPL. The ML fabricated by composite polydimethylsiloxane and Y 3 Al 4 GaO 12 : Cr 3+ (YAGG: Cr 3+ ) may penetrate chicken feet epidermal tissue and 4 mm pork tissue thanks to the strong NIR ZPL emission of YAGG: Cr 3+ phosphor. This discovery of enhancing near-infrared ZPL intensity by solid solution provides us with a new technique for optimizing NIR ML materials, as well as a new prospect for NIR ML materials in biological applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Bo Gao,Xiao Zang,Xiuhui Yin,Baolei Qi,Jiahao Li,Zewen Dong,Xufeng Zhou,Wei Li,Yangbo Wang,Huaiyong Li
Broadband near-infrared (NIR) phosphors emitting in the 700–1000 nm range find extensive applications in night vision, medical image, and food analysis. High luminescence thermal stability of their spectra is crucial for maintaining consistent and reliable output under various thermal conditions. Microcrystalline powders of Sr2Sc2B4O11:Cr3+ are synthesized, and their photoluminescence (PL) properties are studied as functions of Cr3+ concentration, temperature, and excitation power. The energy band structure and phonon density of states of the Sr2Sc2B4O11 lattice are studied theoretically. It is revealed that Sr2Sc2B4O11 is an indirect bandgap material with a bandgap of 3.16 eV. Sr2Sc2B4O11:Cr3+ shows broadband NIR emission centered at 825 nm upon 455 nm excitation with lifetimes on the order of 100 μs from 80 to 600 K. The PL shows good luminescence thermal stability with a quenching temperature of 380 K. Notably, 57% of the room-temperature PL intensity is retained at 423 K. The high luminescence thermal stability of the PL may be attributed to the constraint on the deformation of ScO6 polyhedra through the formation of dimers. A luminescence thermometer based on the lifetime of Sr2Sc2B4O11:Cr3+ is proposed. It is determined that the relative sensitivity of the thermometer increases gradually from 80 to 600 K and exceeds 0.5% K–1 starting from 300 K.
研究领域:
材料科学
·
光学
·
无机化学
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Siquan Xu,Donghui Pan,Yuanfeng Wu,Jingdeng Fan,Ningxin Wu,Lijing Gao,Wenqi Li,Guomin Xiao
The mesoporous SBA-15 has long been used as an adsorbent for the removal of toxic metal ions. Achieving secondary utilize of spent adsorbent is undoubtedly an advisible option for environmental protection and recycling economy. In the present study, phosphoric acid-modified SBA-15 (P-SBA-15) was found to be an available adsorbent, and the composites (Cr3+/P-SBA-15) formed after adsorption of Cr3+ ions have the ability to efficiently catalyze the conversion of xylose and xylan into furfural. The physicochemical properties of the Cr3+/P-SBA-15 composites were characterized, and the effects of various reaction parameters on their catalytic performance were also investigated. Among the Cr3+/P-SBA-15 composites with different Cr3+ contents, the (0.25)Cr3+/P-SBA-15 composite not only achieved excellent 91% and 58% furfural yields from xylose and xylan, but also had almost constant catalytic performance after five cycles. The findings herein provided a reference for achieving high yields of furfural and reuse of spent adsorbents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Zayakhuu Gerelkhuu,Bui The Huy,Jong Won Chung,The-Long Phan,Eric Conte,Yong-Ill Lee
Upconversion phosphors can convert near-infrared light into visible emission by sequentially absorbing multiple photons. In most studies, Yb 3+ /Er 3+ , Yb 3+ /Tm 3+ ions are used as sensitizer/activator in host materials. In this work, we introduce chromium (Cr 3+ ) ions to NaLu 0.86-x Gd 0.12 F 4 :Cr x 3+ Er 0.02 3+ (UCCr) material that is instead of ytterbium (Yb 3+ ) ions. The UCCr material with a different concentration of Cr 3+ ions (0≤x≤0.24) was synthesized by a facile hydrothermal synthesis method. The characterization of the developed UCCr material was performed by photoluminescence (PL), Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and Electron paramagnetic resonance (EPR). The effect of Cr 3+ ions on the upconversion luminescence and magnetic-resonant properties of UCCr material was investigated in detail. The upconversion mechanism was proposed.
研究领域:
材料科学
·
光学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shifang Wang,Mingzheng Sun,Xiaolang Fan,Bowei Liu,Chuangchuang Qiao,Shuang Jing,Xufeng Zhou,Wei Li,Yangbo Wang,Huaiyong Li
Broad band near-infrared (NIR) emitting phosphors activated with Cr 3+ ions hold great potential for diverse applications. Microcrystalline barium gallate powders activated with Cr 3+ were synthesized, and their phase structure, photoluminescence properties as well as their potential uses in luminescence thermometry and plant cultivation, are investigated. It is revealed that Ba 1.3 Ga 12 O 19.3 : Cr 3+ exhibits high efficiency NIR emission in the 650–950 nm range upon blue excitation. At 80 K, the emission is dominated by narrow-peaks resulting from 2 E→ 4 A 2 transition. However, as the temperature rises, thermal coupling between the 2 E and 4 T 2 states leading to increased population of 4 T 2 state, the emission transforms into broad-band. At the same time, a significant decrease in lifetime is observed. This is attributed to the substantial difference in the transition probabilities of 2 E and 4 T 2 states, as well as the initiation of the nonradiative process, specifically the crossover from the 4 T 2 to the 4 A 2 state. Luminescence thermometers based on both luminescence intensity ratio (LIR) and lifetime of Ba 1.3 Ga 12 O 19.3 : 0.45 % Cr 3+ are proposed. High relative sensitivities of 6.78 %·K −1 at 113 K, and above 1 %·K −1 until 293 K is achieved from the LIR-based thermometer, and high values (ca. 1 % K −1 ) over a wide temperature range of 173–573 K are achieved from the lifetime readout.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 20
·10954-10963
·
IF 2.936
Ting Song,Meng Zhang,Yuxue Liu,Jian Yang,Zheng Gong,Hong Yan,Hancheng Zhu,Duanting Yan,Chunguang Liu,Changshan Xu
Spinel-phase Zn2Ga2.98Ge0.75–xSnxO8:Cr0.023+ (ZGGSO:Cr3+) nanoparticles with various Sn4+ concentrations were prepared by a hydrothermal method in combination with a post-annealing in vacuum at high temperature. For these nanoparticles, the observed near infrared (NIR) persistent luminescence peaked at ∼697 nm and originates from the 2E, 4T2 (4F) → 4A2 transitions of Cr3+ and the afterglow time exceeds 800 min. For both the interior and surface Cr3+ ions in the ZGGSO host, it can be found that the increased energy transfer from Cr3+ to the deep trap (anti-site defects, ) after the substitution of Ge4+ by Sn4+ plays a key role in enhancing the persistent luminescence of the ZGGSO:Cr3+ nanoparticles. Strikingly, this energy transfer process can be controlled through the variations in the crystal field strength and the trap depths. Our results suggest that not only Sn4+ substitution can improve in vivo bioimaging but also the existence of deep traps in ZGGSO:Cr3+ nanoparticles is helpful for retracing in vivo bioimaging at any time.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Haiyang Liu,Xuejuan Wan,Tianqi Liu,Yuanqing Li,Youwei Yao
Cascade recognition of trivalent chromium cation (Cr 3+ ) and fluoride anion (F − ) via rhodamine-urea methacrylate-based fluorescent probe (RhBUA) and its subsequent cationic complex was reported. The non-fluorescent rhodamine derivatives can selectively detect Cr 3+ cation over some other metal ions in CH 3 CN–H 2 O (90/10, v/v, pH 7.0) solutions with a 1:1 stoichiometry, leading to prominent fluorescence OFF–ON switching. The obtained RhBUA–Cr 3+ complex can subsequently serve as a sensitive and selective chemosensor for F − ion. Complete signal quenching (fluorescence ON–OFF switching) can also be observed, ascribing to the extraction of Cr 3+ cation and the resulting deformation of RhBUA–Cr 3+ complex.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
InfoMat
·
2025
·
IF 22.3
Gaochao Liu,Zhan Xiong,Weibin Chen,Shuai Zhang,Yuzhen Wang,Zhiguo Xia
High-power broadband near-infrared (NIR) light sources have attracted extensive interest toward emerging non-invasive imaging and detection applications. However, exploring highly stable luminescent materials with targeted broadband NIR emission remains a great challenge. Here, MgAl 2 O 4 :Cr 3+ translucent ceramics have been designed and fabricated by a spark plasma sintering method, and a giant redshift of the emission band occurs from 686 to 928 nm due to the decreasing local structural symmetry around the isolated Cr 3+ ions induced by the abundant cation vacancies. As Cr 3+ content increases, MgAl 2 O 4 :6%Cr 3+ ceramic realizes the optimized external quantum efficiency of 73% with broadband NIR emission centered at 890 nm and a full-width at half-maximum of 315 nm under 450 nm excitation. The next-generation laser-driven light source containing NIR ceramic provides an output power exceeding 2 W and a light conversion efficiency of 22% when pumped with a blue laser of 10 W·mm −2 . The proof-of-concept demonstrations in imaging and detection reveal the advantages of high-power and high-efficiency laser-driven broadband NIR light sources and promote future development in the chemical design of NIR emitters.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2025
·Vol. 40
·期 7
·e70255
·
IF 3
Keyue Wu,Yi Yang,Zeya Wang
Near-infrared (NIR) phosphors activated by Cr 3+ ions hold significant potential for applications such as night vision and plant growth lighting due to their tunable emission properties governed by crystal field (CF) strength. In this study, Cr 3+ and Ti 4+ co-doped MgO phosphors were synthesized via a high-temperature solid-state reaction to modulate the NIR emission. Structural and optical characterizations revealed that Ti 4+ incorporation enhances the CF strength ( D q/ B ratio increases from 2.4 to 2.6), inducing a blue shift in the emission peak from 810 (MgO:Cr 3+ ) to 780 nm (Mg 0.8 Ti 0.2 O:Cr 3+ ) and with a strong sharp emission at 720 nm. The Ti 4+ doping also increases the fluorescence lifetime from 150.9 to 816.4 μs, attributed to altered Cr 3+ occupancy in octahedral sites and modified spin-allowed transitions. These findings demonstrate that Ti 4+ co-doping effectively tunes the NIR emission of MgO:Cr 3+ phosphors, offering a promising strategy for designing wavelength-adjustable NIR light sources.
研究领域:
材料科学
·
光学材料
·
固体物理
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）