CHEMISTRY OF MATERIALS
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2025
·
IF 7
Hui Zhu,Cheng Zhou,Siying Li,Huanhuan Chen,Xuan Shi,Yanyue Li,Pingzhi Zhang,Wei Li,Maxim S. Molokeev,Andrey O. Zolotov,Jing Wang,Zhi Zhou,Mao Xia
Introducing large-radius cations usually causes structural relaxation, leading to a spectral redshift and low optical performance in Cr3+-activated phosphors. Here, MNAl10O17:Cr3+ phosphors are synthesized, and the substitution of large-radius cations induces the abnormal lattice shrinkage of the N site and atomic site splitting of the M site due to the unique hexaaluminate structure, further distinctly improving luminescent properties. To investigate the university of atomic site splitting, a series of phosphors, Na2(1–m)K2mAl10.8O17:0.2Cr3+ and Gd1–nLanMgAl10.8O19:0.2Cr3+, are synthesized, and the variation of their luminescent properties conforms to the expected rule. Finally, Ga3+ ions are introduced to improve the luminescence efficiency. Internal/external quantum efficiencies of the optimal sample are 98.1 and 65.8%, respectively. Meanwhile, an anomalous spectral blueshift indicates the existence of Cr3+–Cr3+ exchange coupling pairs, and a comparative analysis of similar cases is conducted to provide some insights into the luminescence of coupling pairs.
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高影响因子
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
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固态照明
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无机化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Xiaoqian Dong,Zhibin Chen,Lehui Liu,Feifei Yuan,Yisheng Huang,Lizhen Zhang,Zhoubin Lin
Broadband near-infrared (NIR) phosphors play a crucial role in the development of next-generation smart NIR light sources based on blue light-emitting diodes (LEDs). The emission bandwidth is an important parameter for evaluating the performance of these phosphors. Herein, an ultra-broadband NIR phosphor CaMgSi 2 O 6 :Cr 3+ (CMSO:Cr), with a tunable emission band and a full width at half maximum (FWHM) ranging from 138 nm to 393 nm, is obtained by adjusting the doping concentration of Cr 3+ . In the low-concentration doped sample, a single emission peak at 785 nm is observed. When the concentration of Cr 3+ exceeds 1.0 at%, emissions at both 785 nm and 980 nm are detected. The emission peak at 785 nm originates from the [MgO 6 ](Ⅰ) octahedron within the CMSO structure. On the other hand, the emission peak at 980 nm is attributed to the presence of a twisted octahedron [MgO 6 ](Ⅱ), which is caused by defects and vacancies resulting from the charge imbalance when Mg 2+ ions are replaced by Cr 3+ ions. The Cr 3+ ion primarily occupies the [MgO6](Ⅰ) site in the lower-concentration doped sample, which explains the photoluminescence peak at 785 nm. With the increase in the concentration of Cr 3+ ions, more and more Cr 3+ ions preferentially occupy the [MgO 6 ](Ⅱ) octahedral sites, leading to the broad emission at 980 nm. A novel NIR phosphor light source was fabricated by combining a blue chip with CMSO:Cr phosphor. Driven by a current of 60 mA, the NIR light output power of 5.89 mW and 0.76 mW is achieved by using CMSO:0.015Cr and CMSO:0.04Cr, respectively. This work demonstrates that new luminescent centers can be generated by substituting heterovalent ions, resulting in broadened emission spectra.
研究领域:
材料科学
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光电
·
光子学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Geng Chen,Yahong Jin,Lifang Yuan,Bo Wang,Jiansheng Huo,Hao Suo,Haoyi Wu,Yihua Hu,Feng Wang
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) hold promising potential as next-generation compact, portable, and intelligent NIR light sources. Nonetheless, the lack of high-performance broadband NIR phosphors with an emission peak beyond 900 nm has severely hindered the development and widespread application of NIR pc-LEDs. This study presents a strategy for precise control of energy-state coupling in spinel solid solutions composed of MgxZn1–xGa2O4 to tune the NIR emissions of Cr3+ activators. By combining crystal field engineering and heavy doping, the Cr3+–Cr3+ ion pair emission from the 4T2 state is unlocked, giving rise to unusual broadband NIR emission spanning 650 and 1400 nm with an emission maximum of 913 nm and a full width at half-maximum (fwhm) of 213 nm. Under an optimal Mg/Zn ratio of 4:1, the sample achieves record-breaking performance, including high internal and external quantum efficiency (IQE = 83.9% and EQE = 35.7%) and excellent thermal stability (I423 K/I298 K = 75.8%). Encapsulating the as-obtained phosphors into prototype pc-LEDs yields an overwhelming NIR output power of 124.2 mW at a driving current of 840 mA and a photoelectric conversion efficiency (PCE) of 10.5% at 30 mA, rendering high performance in NIR imaging applications.
研究领域:
材料科学
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光电
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光子学
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固体物理
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化学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Honglei Yuan,Yanzhi Bai,Gaoliang Wang,Liuyang Xu,Huanxia Jia,Xianke Sun
The broadband near-infrared phosphors are feasible to apply in real-time nondestructive examination . In this work, La 3 Ga 5 SiO 14 :Cr 3+ phosphors with the broadband near-infrared emission have been synthesized using a solid state reaction method. Their optical characteristics were investigated via the measurements of ultraviolet–visible diffused reflectance and luminescence spectra. The occupations of Cr 3+ ions in La 3 Ga 5 SiO 14 host were inquired by the X-ray absorption near edge structure and electron paramagnetic resonance analyses. The results indicate that Cr 3+ ions substitute octahedral and tetrahedral Ga 3+ ions in La 3 Ga 5 SiO 14 host, which results in a sharp emission band coming from the 2 E g → 4 A 2g transitions of Cr 3+ and a wide emission band coming from the 4 T 2g → 4 A 2g transitions of Cr 3+ . The fabricated NIR pc-LED device by combining the synthesized La 3 Ga 5 SiO 14 :0.10Cr 3+ phosphor with a blue LED chip indicates that the La 3 Ga 5 SiO 14 :Cr 3+ phosphors have potential applications in nondestructive examination.
研究领域:
材料科学
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光学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2024
·
IF 4.3
Zhichao Ren,Hongquan Yu,Jinsu Zhang,Xiangping Li,Sai Xu,Baojiu Chen
For the first time, nanotubes of Y3Ga5O12:Cr3+ (referred to as YGO:Cr3+) and Y3Ga5O12:Cr3+/Yb3+ (referred to as YGO:Cr3+/Yb3+) were produced via a single-needle electrospinning method. The nanotubes of YGO:Cr3+ and YGO:Cr3+/Yb3+ have outer diameters between 190 and 210 nm, whereas the inner diameter ranges between 70 and 80 nm, and the wall thickness ranges from 50 to 60 nm. The temperature sensitivity of YGO:0.02Cr3+ nanotubes was examined by studying how the Cr3+ lifetime changes with temperature. In the temperature range of 303 to 723 K, the peak values of Sa and Sr were 0.274 and 0.0067 K–1, respectively. Temperature sensing properties of YGO:0.02Cr3+/yYb3+ (y = 0.01, 0.02, and 0.05) nanotubes were evaluated via the FIR technique utilizing nonthermally coupled energy levels. The I970/I708 in the YGO:0.05Cr3+/0.01Yb3+ nanotubes displayed a maximal Sr value of 0.013 K–1 at 633 K, which exceeds that of other Cr3+-doped NIR phosphors previously reported and is promising for high-temperature measurements.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
Current Analytical Chemistry
·
2025
·Vol. 21
·期 1
·57-67
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IF 1.7
Mengfei Yang,Jing Shi,Taiming Luo,Xiaozhan Yang
Aims By using terephthalic acid, 2, 5-furandicarboxylic acid, and terbium nitrate hexahydrate, a Tb-MOF with a core-shell structure was successfully designed and prepared. Methods A one-pot method was employed to design and synthesize core-shell Tb-MOF. The morphology, luminescence performance, and stability were well characterized. Results Tb-MOF demonstrated good water stability, acid and alkali resistance, and thermal stability. Tb-MOF was found to have high sensitivity to detect Cr3+, Bi3+, and acetone in an aqueous solution, and the LOD of Cr3+, Bi3+, and acetone were calculated to be 0.18 μM, 4.22 μM, and 0.26%, respectively. The sensing mechanism of Cr3+ and acetone was explained as energy-competitive absorption, and the sensing mechanism of Bi3+ was explained as ion replacement. Conclusion The prepared Tb-MOF can be developed as a multifunctional light-emitting sensor with high selectivity.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xin Xie,Wanyin Ge,Ye Tian,Qian Zhang,Maohao Yang,Chenge Wu,Peng He,Honglei Yin
To develop continuous broadband emission near-infrared (NIR) phosphors compatible with blue LED chips, numerous Cr 3+ -Yb 3+ co-doped phosphors have been synthesized. However, the emission spectra of Cr 3+ vary significantly across different matrix materials, while Yb 3+ maintains a relatively stable emission spectrum. This variation leads to notable luminescence depressions between 850 and 900 nm in many Cr 3+ -Yb 3+ co-doped phosphors. To address this emission spectrum gap, we utilized Cr 3+ as a sensitizer and introduced Nd 3+ as the luminescence center within the La 3 Sc 2 Ga 3 O 12 matrix material, establishing a Cr 3+ -Nd 3+ energy transfer channel. Under 480 nm excitation, we tuned emission peaks at 800 nm (Cr 3+ ) and 881 nm (Nd 3+ ). The stable NIR emission of Nd 3+ effectively compensates for the missing spectrum in Cr 3+ -Yb 3+ co-doping. The Cr 3+ -Nd 3+ energy transfer process was thoroughly analyzed using diffuse reflection spectrum, excitation spectrum, and fluorescence decay curves. The LSGO:0.125Cr 3+ , 0.03Nd 3+ compound with the best optical performance was packaged with a 480 nm LED chip to create a NIR light source. At a working current of 10 mA, it achieved a photoelectric conversion efficiency of 9.45 %, demonstrating its potential for applications in non-destructive detection and luminescence thermometry. This work presents a novel strategy for tuning NIR spectral distribution and developing continuous broadband NIR phosphors.
研究领域:
材料科学
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光学
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光子学
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光谱学
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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
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生物医学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Renping Cao,Jiaxue Tang,Jingheng Nie,Chenxing Liao,Ya Cao,Lan Li,Ru Liu,Jing Wang
Due to their applications in lighting, imaging, security, night vision, optoelectronics and other fields, far-red to near-infrared luminescence materials have attracted significant interest. Efficient pure phase Ca 2 AlNbO 6 :Cr 3+ phosphor is synthesized in air. The excitation spectrum of Ca 2 AlNbO 6 :Cr 3+ can be observed in the range of 260–700 nm because of the transitions 4 A 2 → 4 T 1 ( 4 P), 4 T 1 ( 4 F), and 4 T 2 ( 4 F) of the Cr 3+ ions. Ca 2 AlNbO 6 :Cr 3+ emits far-red to near-infrared light with peaks at 745 and 755 nm in the range of 650–880 nm due to the transitions 2 E → 4 A 2 and 4 T 2 ( 4 F) → 4 A 2 of the Cr 3+ ion. The concentration dependent spectra of Ca 2 AlNbO 6 :Cr 3+ confirm that 0.4 mol% is the optimal concentration of Cr 3+ ions in Ca 2 AlNbO 6 :Cr 3+ . The emission spectra under different excitation wavelength and time-resolved emission spectra indicate that Cr 3+ is the only luminous center in Ca 2 AlNbO 6 :Cr 3+ . As Cr 3+ is added from 0.2 mol% to 1.0 mol%, the lifetime of Ca 2 AlNbO 6 :Cr 3+ decreases in turn from 3.25 ms to 2.82 ms. The temperature dependent spectra prove a good thermal stability of Ca 2 AlNbO 6 :Cr 3+ . The paper content can be applied to develop new Cr 3+ -doped luminescence materials in the future.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MODERN OPTICS
·
2024
·
IF 1.2
Hui Ying Zhang,Wan Ying Xie,Peng Zhang,Xiao Hui Li,Zian Cheak Tiu
In this work, NaGdF4: 20%Yb, 2%Er microcrystals with varying contents of Cr3+ doping were obtained by conventional hydrothermal process. The microcrystal phase structure, morphology, upconversion luminescence mechanism, as well as temperature sensing behaviour under different treatment methods were researched. Based on the thermally coupled 2H11/2 and 4S3/2 levels of Er3+ and the dependence of fluorescence intensity ratio (FIR) on temperature, the optical temperature sensing behaviour of micrometer crystals were experimentally demonstrated. The NaGdF4: 20%Yb, 2%Er, 7%Cr microcrystals treated with high-temperature annealing show the best temperature sensing behaviour within the temperature span of 298–498 K. NaGdF4: 20%Yb, 2%Er, 7%Cr microcrystals with high temperature annealing presented the feasibility and promising properties for optical temperature sensing. The endeavour of emerging materials could lay the groundwork for future sustainable photonics engineering industrial growth.
研究领域:
材料科学
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光学工程
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DOI
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.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）