CERAMICS INTERNATIONAL
·
2026
·
IF 6
Nasi Yu,Wenhua Li,Jiyou Zhong
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have an extensive range of applications within multiple fields, such as bioimaging, night vision and non-destructive examination. Therefore, developing broadband, low-cost, and efficient NIR phosphors capable of satisfying the demands of the above applications is desired. In this work, a series of inexpensive phosphate Na 2 AlTi(PO 4 ) 3 :Cr 3+ phosphors were developed. This material shows a broadband NIR emission covering 700-1200 nm with emission peak located at 830 nm and a full width at half maximum (FWHM) of 152 nm under 470 nm excitation. Moreover, the photoluminescence quantum yield (PLQY) can be optimized to 79.1%, suggesting a high efficiency among octahedral Al 3+ -containing NIR materials. Finally, a prototype NIR pc-LED device was fabricated via directly coating the InGaN blue LED chip with the optimized Na 2 AlTi(PO 4 ) 3 :Cr 3+ phosphor. The NIR output power of the device was determined to be 17.24 mW at 100 mA driving current, and the corresponding NIR photoelectric conversion efficiency was 7.51%, indicating the excellent output performance, and good potential in practical applications.
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PROGRESS IN NUCLEAR ENERGY
·
2026
·
IF 3.2
Yixuan Cai,Mei Li,Hedi Wei,Xudong Wang,Jiayi Chen,Jia Yan,Rugeng Liu,Linshan Zhang,Wei Han
To electrodeposit uranium dioxide from LiCl–KCl molten salt containing Cr 3+ and Ni 2+ , a series of electrochemical techniques were employed to investigate the electrochemical behavior of UO 2 2+ , Cr 3+ , and Ni 2+ . CV and SWV measurements revealed that Cr 3+ is reduced to metallic Cr through a two-step process, while Ni 2+ undergoes a one-step, two-electron process to form metallic Ni. UO 2 2+ is reduced to uranium dioxide via two successive one-electron transfer steps, and its reduction mechanism remains unaffected by the presence of Cr 3+ and Ni 2+ . Chronoamperometry was employed to study the influence of Cr 3+ on the nucleation mechanism of UO 2 2+ , which indicated that the addition of Cr 3+ could decrease the nucleation density of uranium dioxide. In addition, the effects of Cr 3+ and Ni 2+ on the electrodeposition of uranium dioxide were separately explored. In the presence of Cr 3+ , the deposited product contained only uranium dioxide and no Cr was deposited, but the current efficiency was reduced. Pulse electrolysis was carried out and found that current efficiency could be improved by pulse electrolysis in the presence of Cr 3+ . The introduction of Ni 2+ led to the co-deposition of uranium dioxide and Ni, while significantly accelerating the extraction rate of uranium dioxide. Thermodynamic analysis and experimental results indicate that this enhancement arises from the in situ reduction of UO 2 2+ by the deposited Ni, a process that proceeds much faster than the direct electrochemical reduction of UO 2 2+ .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jianhua Lin,Liuyan Zhou,Long Ren,Yuyu Shen,Yanling Chen,Jie Fu,Lei Lei,Renguang Ye,Degang Deng,Shiqing Xu
Near-infrared (NIR) phosphors converted to light-emitting diodes (pc-LED) sources have extensive application prospects in medical imaging, foodstuff analysis and plant growth fields. However, there are some shortcomings in NIR phosphors, such as narrow emission band and poor thermal stability. Here a new wide band NIR luminescent phosphor Cr 3+ -doped Sr 3 Sc 4 O 9 (SSO) is introduced. The emission spectrum ranges from 600 nm to 1000 nm, with a peak value of 761 nm and the value of full width at half maximum (FWHM) is 120 nm. The internal quantum efficiency (IQE) of sample is about 87% according to the fitting result. The most appropriate doping concentration is x = 0.02 and the best excitation wavelength is 468 nm, which matches the commercial blue chip. At the same time, the phosphor shows good thermal stability in variable temperature spectrum test, and can maintain 70.4% emission intensity at 373 K relative to room temperature . To better understand its practical applications, packaged pc-LED is designed to show good NIR light penetration in spectral penetration tests . This study provides an excellent choice of NIR phosphors.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Feifeng Huang,Yuqing Yan,Guanyu Zhu,Yi Zhang,Zhexuan Gao,Mingwei Fu,Ying Tian,Degang Deng,Shiqing Xu
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are highly promising for various applications, including food analysis, night vision, and biological detection. In this work, we report a Cr 3+ -doped Zn 7 Sb 2 O 12 phosphor, which was prepared through a high-temperature solid-phase method. Under excitation at 400 nm, the phosphor reveals an emission spectrum that extends from 700 to 1400 nm, peaking at 950 nm with a full width at half maximum (FWHM) of 179 nm. In addition, the internal quantum efficiency (IQE) of the Zn 7 Sb 2 O 12 : 0.01Cr 3+ phosphor is recorded at 33.13%. When encapsulated in pc-LEDs, the phosphor achieves a near-infrared (NIR) output power of 18.90 mW at 160 mA, along with a photoelectric conversion efficiency (PCE) of 15.45% at 20 mA. The developed pc-LED shows promise in non-destructive testing and night vision technologies.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yanting Zhu,Chenxia Li,Degang Deng,Hua Yu,Hao Li,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor was synthesized by traditional high temperature solid stated method, and the temperature-sensitive characteristic of the phosphor was researched. Due to the temperature sensitivity of the fluorescence lifetime of Cr 3+ , the thermometry based on fluorescence lifetime can be realized. Furthermore, the emissions of Eu 2+ ion and Cr 3+ ion can be well separated, which shows the excellent signal recognition ability of this phosphor. The Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor can be used for the thermometry based on fluorescence intensity ratio. A dual-mode optical thermometry is proposed and researched in the temperature range of 293–563 K by using the decay lifetime of Cr 3+ emission and in the temperature range of 295–476 K by using the fluorescence intensity ratio of Eu 2+ to Cr 3+ as temperature readout. The maximum values of relative sensitivity are 0.466% K −1 at 363 K and 0.259% K −1 at 476 K. The Eu 2+ /Cr 3+ co-doped BaAl 12 O 19 phosphor has excellent optical temperature characteristic , and its dual-mode thermometry characteristics provide convenience for the application of this material. This phosphor has potential application prospects in the field of optical thermometry.
研究领域:
材料科学
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光学工程
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无机化学
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传感器技术
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功能材料
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Advanced Optical Materials
·
2024
·Vol. 12
·期 15
·2303018
·
IF 8
Xueqing Liu,Lu Chen,Xiaowen Huo,Feng Liu,Chuan Liao,Liangliang Zhang,Jiahua Zhang,Shaoan Zhang,Yang Li,Xiao-jun Wang,Yichun Liu
The ZnGa 2 O 4 :Cr 3+ phosphor has emerged as a significant luminescent material due to its long-lasting afterglow and near-infrared emission, making it suitable for applications in bioimaging and night-vision detection. However, the limited availability of excitation light sources poses a challenge for charging the phosphor. In this study, the charging capabilities of ZnGa 2 O 4 :Cr 3+ using visible lasers and a white flashlight as excitation sources are explored. By absorbing two excitation photons, the high-lying delocalized state of Cr 3+ can be excited through a two-step process, resulting in the filling of persistent luminescence traps and producing a long-lasting emission peaking at 696 nm. The application of the white flashlight revealed a nonlinear excitation threshold for charging at 1.5 mW cm −2 . The findings also uncovered that the excitation mechanism involves excited-state absorption and energy-transfer upconversion. Moreover, taking advantage of the unique excitability of the near-infrared persistent phosphor, the potential for charging persistent luminescent probes in vivo using chicken breast tissue as a representative model is showcased. The present upconversion charging approach may offer promising possibilities and introduce a novel excitation technique for ZnGa 2 O 4 :Cr 3+ persistent phosphor.
研究领域:
材料科学
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光子学
·
发光材料
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生物成像
·
光学传感
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Applied Materials Today
·
2026
·
IF 6.9
Feifeng Huang,Renguang Ye,Chenxia Li,Shuangbin Ma,Feiting Huang,Degang Deng,Shiqing Xu
Cr 3+ -activated near-infrared (NIR) phosphors have attracted significant attention in recent years owing to their potential applications in nondestructive testing, bioimaging, and night vision technologies. However, the development of high-performance NIR phosphors remains a considerable challenge. In this work, a novel broadband NIR-emitting phosphor, YGdScSbO 7 : Cr 3+ , was successfully synthesized via a high-temperature solid-state reaction. The obtained phosphor exhibits a strong emission centered at 763 nm with a full width at half maximum (FWHM) of 142 nm. Inspired by the cation substitution strategy, the partial substitution of Sc 3+ with Ga 3+ ions significantly improves the emission intensity and quantum efficiency. The optimized sample, YGdScSbO 7 : 0.03Cr 3+ , 0.8Ga 3+ , shows a broadband NIR emission covering the 600–950 nm region with a FWHM of 117 nm and an internal quantum efficiency as high as 73.89%. Furthermore, the sample maintains approximately 56.64% of its initial emission intensity at 363 K, indicating great thermal stability. A NIR phosphor-converted LED (pc-LED) fabricated by the optimized phosphor with a 450 nm blue LED chip delivers an output power of 8 mW under the 180 mA driving current, demonstrating promising potential for applications in night vision illumination, nondestructive inspection, and biomedical imaging.
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Advanced Powder Materials
·
2026
·
IF 24.9
Maoyuan Huang,Haiyang Li,Jie Zhao,Bo Tan,Shiliang Mei,Wanlu Zhang,Pengfei Tian,Ruiqian Guo
Indium phosphide (InP) quantum dots (QDs) have gained global research focus owing to their eco-friendly properties and outstanding optical characteristics. However, blue emission of InP QDs has made slow progress owing to surface defects and lattice mismatch between core and shell. Meanwhile, the ferromagnetism of traditional dilute magnetic semiconductors (DMSs) is limited by insufficient Curie temperature, failing to meet practical applications. Herein, we report Cr 3+ -doped InP/ZnS QDs with dual functions of pure blue emission and room-temperature ferromagnetism. By using hot injection method, Cr 3+ ions are precisely embedded into the core-shell interface of QDs, effectively passivating the surface defects of the InP cores. This approach enables the fabrication of pure blue-emitting QDs with an emission of 471 nm, a photoluminescence quantum yield (PLQY) of 52%, and a full width at half maximum (FWHM) of 46 nm. Through the dominance of ferromagnetic superexchange interaction, synergizing with the intrinsic strong local magnetic moment of Cr 3+ and quantum confinement effect, room-temperature ferromagnetism is achieved in InP-based QDs for the first time (Curie temperature above 350 K and maximum coercivity of 95.45 Oe). This work provides new materials for spintronic devices, and the Cr 3+ doping strategy also offers a reference for the opto-magnetic regulation of III-V QDs.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yu Zhang,Kai Li,Xuelian Zhou,Kaixuan Wang,Ze Wang,Sur Lig,Kefu Chao,Fengqi Zhao
Cr 3+ -doped near-infrared phosphors have recently attracted a wide attention. Here, NIR Ca 1- y Sr y Al 12- x Ga x O 19 :0.12Cr 3+ phosphors are obtained by a high-temperature solid-phase method. First, a series of CaAl 7.88 Ga 4 O 19 :0.12Cr 3+ samples is studied and shows that the crystal field strength can be tuned by cation substitutions, until achieving a sharp emission at 692 nm and a broad emission at 780 nm under a 400 nm excitation, and an internal quantum yield of 90.73%. A further substitution by an appropriate amount of Sr 2+ is suggested to be beneficial to increase the rigidity of the crystal structure by Debye temperature calculations. Experimentally, it is observed that Sr 2+ for Ca 2+ substitutions did not affect the luminescence wavelength and resulted in a significant increase of the thermal stability. When 0.7 Sr 2+ substitute Ca 2+ , the thermal stability at 450 K increased by 28% compared to the samples without Sr 2+ .
研究领域:
材料科学
·
无机化学
·
固体物理
·
光学材料
·
功能材料
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CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 21
·43373-43382
·
IF 5.1
Xin Yi,Hui Liu,Yihuan Wang,Junjie Chen,Zhanglin Chen,Yuzhen Wang,Xuanyi Yuan,Kaiming Zhu
Photo-stimulated luminescent materials are one of the most attractive alternatives for next-generation optical information storage technologies. However, there are still some challenges in regulating appropriate energy levels of traps in luminescent materials for optical information storage. Herein, a green emission nanophosphor Zn 2 SiO 4 : Mn 2+ , Cr 3+ with the trap depth of 1.05 eV, fulfilling the requirements for optical information storage, was fabricated for the first time through the solution combustion method and subsequent heat treatment at 1000 °C for 2 h. The crystal structure, micromorphology , photoluminescence (PL), photoluminescence excitation (PLE), and afterglow properties of Zn 2 SiO 4 : Mn 2+ , Cr 3+ were studied systematically. By applying the strategy of trap depth engineering, high trap density with proper trap depth was observed when Cr 3+ ions were introduced into Zn 2 SiO 4 : Mn 2+ . Thermoluminescence (TL) glow-curve analysis through the initial rise (IR) method was conducted to gain some insights into the information of traps. As proof of application, optical information storage was experimentally achieved by choosing 275 nm illumination for “information writing” and 980 nm NIR excitation for “information reading”. The results indicate that Zn 2 SiO 4 : Mn 2+ , Cr 3+ phosphor holds promise for potential applications in the field of optical information storage.
研究领域:
材料科学
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光存储
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发光材料
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纳米技术
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·7069-7077
·
IF 3.9
Xiaomeng Yin,Ming Qiang,Hui Lin,Dawei Zhang,Ruijin Hong,Zhaoxia Han
In this work, we fabricated a novel spinel-type phosphor material MgAl 2− x Ga x O 4 doped with Cr 3+ by the high-temperature solid-state sintering method. The crystal field environment of the spinel was tuned by replacing the Al ions with Ga 3+ ions of different concentrations. The cell volume and D q / B gradient increase from 2.82 to 2.62 with increasing Ga 3+ ion doping concentration. This also implies a gradual decrease in the field strength of the crystal. Based on this, the excitation spectra of MgAl 1.995− x Ga x O 4 :0.5%Cr 3+ phosphors yield a redshift. Increasing the Ga 3+ ion doping concentration also improves the emission intensity and thermal stability of the phosphors, and the emission intensity of the Ga 3+ -doped phosphors is significantly increased. For a Ga/Al ratio of 1, the thermal stability of the phosphor emission is optimal. The emission intensity at 140°C can maintain 76% of the emission intensity at room temperature, indicating that appropriate Ga 3+ ion doping can improve the emission efficiency and thermal stability of the phosphors.
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OPTIK
·
2022
·
IF 2.84
Wenlin Feng,Chenyuan Yuan,Ting Li,Xiaozhan Yang
A fiber-optic surface plasmon resonance (SPR) sensor based on the trivalent chromium-ion imprinted polymer (Cr 3+ -IIP) was proposed and fabricated. A small core-diameter fiber (SCF) with a length of 1 cm is spliced between two multimode fibers (MMFs) to form the MMF-SCF-MMF sensing structure. A 67-nm thick Ag film was evaporated on the outside surface of the SCF, and then Cr 3+ -IIP and nonionic imprinted polymer materials were respectively coated on the surface of the Ag film and then the fiber-optic SPR sensor was obtained. The results show that with the increase of Cr 3+ concentration in the range of 0–1.1 µM, the SPR peak indicates redshift with 80.5 nm. The sensitivity and linearity of the sensor are 71.7 nm/µM and 0.994, respectively. The limit of detection of the sensor is about 0.041 μM (2.145 ppb). The fiber-optic SPR sensor is expected to be applied to the detection of trace Cr 3+ ions in water.
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