DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 43
·16757-16763
·
IF 4.569
Chaojie Li,Jiyou Zhong,Huan Jiang,Peng Shi
Compact broadband near-infrared (NIR) light sources generated by phosphor-converted light-emitting diodes (pc-LEDs) have attracted considerable interest in emerging smart NIR spectroscopy applications. However, discovering a highly efficient and thermally stable broadband NIR phosphor still remains a significant challenge. Here, we report a new efficient garnet phosphor, Gd3In2Ga3O12:Cr3+, which has a broadband emission peaking at 780 nm with a full-width at half maximum (FWHM) of 124 nm. The optimized Cr3+-doping concentration of this material is particularly high (9 mol%), resulting in a high quantum yield and absorption efficiency of 85.3% and 49.1%, respectively. Moreover, 87.7% of the initial emission intensity can be retained when heating up to 150 °C, demonstrating the excellent thermal stability of this material. Fabricating a prototype NIR device by using the as-prepared material in combination with a blue LED chip, an excellent NIR output power (33.7 mW) with a NIR photoelectronic conversion efficiency of 12.0% can be achieved under a 100 mA driving current. These results indicate that the Gd3In2Ga3O12:Cr3+ phosphor may have great potential for broadband NIR pc-LED applications.
研究领域:
光学材料
·
生物医学光子学
·
分子成像
·
转化医学
·
半导体器件
·
光电子学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·65882-65888
·
IF 5.6
Yonglin Chen,Haoyi Wu
In this work, Li 3 Mg 2 TaO 6 :Cr 3+ phosphors were designed and synthesized by solid-phase method. Spectra show that the Cr 3+ -doped phosphors exhibit broadband emissivity in the range of 700–1200 nm, with a full width at half maximum (FWHM) of approximately 165 nm at wavelength excitation at 462 nm. The internal quantum efficiency (IQE) of phosphors is 63.1 %. Under a driving current of 270 mA, the output power of the device can achieve 36.2 mW. Combining Li 3 Mg 2 TaO 6 :Cr 3+ phosphor and a 460 nm blue chip, a near-infrared pc-LED was fabricated and demonstrated for night vision of objects, as well as rapid imaging of the veins of a fist.
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产品关联
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
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光电子学
·
固态照明
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ganggang Guo,Qiong Xi,Tao Yin,Jianju Nie,Yayuan Zhang,Li Guan,Zhenyang Liu,Fenghe Wang,Xu Li
Broadband near-infrared (NIR) phosphors are key materials for the preparation of NIR phosphor-converted light-emitting diodes (pc-LEDs). The wider coverage of the NIR spectrum means that more substances can be detected by NIR light and more applications are possible. However, ultra-broadband NIR phosphors with the full-width at half maximum (FWHM) greater than 200 nm still face challenges in terms of thermal stability as well as internal quantum efficiency (IQE). In this work, a series of La 2 CaTa x Zr (1- x ) O 6 (LCTZO): Cr 3+ phosphors was successfully synthesized by the high-temperature solid-phase method. The non-equivalent substitution strategy of Ta 5+ in place of Zr 4+ effectively modulates the crystal field environment of Cr 3+ and reduces the number of defects, thus modulating the luminescence properties of the phosphor. Under the 471 nm excitation, the spectrum of La 2 CaTa 0.3 Zr 0.7 O 6 : 2 % Cr 3+ can cover the 700–1400 nm band (FWHM = 201 nm) with IQE of 42.6 %, and the emission intensity can be maintained at 373 K at 74 % of that at room temperature . The prepared NIR pc-LED with ultra-wide spectral coverage shows better potential applications in the fields of night vision and biological tissue penetration.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
分子成像
·
光电子学
·
纳米医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yixin Sun,Yining Wang,Minliang Deng,Xiaole Xing,Yiying Zhu,Mengmeng Shang
The swift progress in portable spectrometer technology has fostered a widespread need for compact light sources. Concurrently, near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs), characterized by their low cost and compact structure, emerge as an optimal choice. Inspired by phase optimization through fluxes, we successfully synthesized pure phase Lu 3 Mg 2 GaSi 2 O 12 (LMGS):Cr 3+ , 3 wt%MgF 2 luminescent materials by incorporating various fluxes including LiF, NaF, MgF 2 , CaF 2 , SrF 2 and BaF 2 . These materials emit broadband NIR light ranging from 620 nm to 1150 nm, with full width at half-maximums (FWHMs) exceeding 125 nm. By employing a dual-fluxes strategy to further enhance the luminescence intensity of Cr 3+ , the LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 sample exhibits a 2.45 times increase in emission intensity compared to the LMGS:3%Cr 3+ , 3 wt%MgF 2 sample. Concurrently, the quantum efficiency rises from 24 % to 46 %. Moreover, the integrated emission intensity of LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 retains at 75 %@425 K of its value at RT. Upon coupled with a 430 nm LED chip, the luminescent material exhibits an NIR output power of 43.8 mW@300 mA, indicating promising applications in rapid night identification, night vision and non-destructive testing.
研究领域:
材料科学
·
光学材料
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固态照明
·
光子学
·
无机化学
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DOI
高影响因子
Advanced Physics Research
·
2022
·Vol. 2
·期 4
·2200056
·
IF 0
Kuangnan Lyu,Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr 3+ -doped AlNbO 4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr 3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr 3+ emitters in different Al 3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO 4 :Cr 3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr 3+ -doped AlNbO 4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
研究领域:
光学材料
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生物医学光学
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光电子学
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无机功能材料
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分子影像
✓ 已验证
DOI
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Zhenyue Wu,Lina Li,Chengmin Ji,Guoming Lin,Sasa Wang,Yaoguo Shen,Zhihua Sun,Sangen Zhao,Junhua Luo
Organic–inorganic hybrid lead halide (e.g., CH3NH3PbX3, where X = CI, Br, and I) nanowires (NWs) with remarkable electric and optical properties have recently garnered increasing attention, owing to their structural flexibility and tunability compared to inorganic semiconducting NWs. While most recently reported NWs are limited to methylammonium/formamidinium three-dimensional lead halide perovskites, it is urgent to develop new organic–inorganic hybrid semiconducting NWs. Here, broad-band-emissive single-crystal semiconductive NWs based on a new ABX3-type organic–inorganic chain hybrid, (2-methylpiperidine)lead tribromide, are reported. It is believed that this work will enrich the organic–inorganic hybrid semiconducting NWs and may provide potential applications for LED displaying.
研究领域:
材料科学
·
半导体物理
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Yingguang Li,Mingwei Fu,Peng Qiao,Shulian Liu,Degang Deng,Shiqing Xu,Hongping Ma
In this study, a non-activated ion-doped full-spectrum emission phosphor for white light-emitting diode (WLED) lighting is proposed using oxygen defect engineering. The YMZn 3 AlO 7 (M = Ca, Sr, Ba) phosphors with "114″ structure were prepared via a high-temperature solid-state reaction. Under excitation with 373 nm ultraviolet (UV) light, YSrZn 3 AlO 7 in YMZn 3 AlO 7 (M = Ca, Sr, Ba) exhibited the highest emission intensity and formed a wide yellow emission band centred at 563 nm. The full width at half maximum of the YSrZn 3 AlO 7 phosphor was 172.6 nm. A theoretical model based on the designed oxygen vacancies was proposed to determine the self-activated luminescence mechanism. Density functional theory calculations revealed that oxygen vacancies lead to the generation of new energy levels. Electron paramagnetic resonance experiments further confirmed that the luminescence originated from oxygen vacancies. Eventually, a warm WLED device ((x, y) = (0.4057, 0.4359)) with a correlated color temperature of 3814 K and a relative color rendering index of 83 was successfully prepared using the YSrZn 3 AlO 7 phosphor and a 365 nm UV LED chip. These results suggest that YSrZn 3 AlO 7 is a promising WLED phosphor and provide new insights into the application of self-activated phosphors in WLED.
研究领域:
材料科学
·
光电技术
·
照明技术
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DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 9
·1558
·
IF 5.3
Qianyi Chen,Minbo Wu,Puxian Xiong,Yajing Zhao,Shuhang Tian,Yao Xiao,Yongsheng Sun,Dongdan Chen,Shanhui Xu,Zhongmin Yang
Yellow lasers are of great interest in biology, medicine and display technology. However, nonlinear emission of near-infrared lasers at yellow still presents particularly complex optical alignment to date. Here, to the best of our knowledge, we demonstrate the fabrication of a NaLa(WO4)2: Dy3+glass-ceramic fiber (GCF) for the first time. More importantly, the emission band of the GCF, which is around 575 nm, has a wide full-width half maximum (FWHM) of 18~22 nm, which is remarkably larger than that of the Dy3+-doped YAG crystal (<7 nm). The precursor fiber (PF) was drawn using the molten core drawing (MCD) method. In particular, benefiting from the in situ nanocrystals fabricated in the amorphous fiber core after thermal treatment, the resultant glass-ceramic fiber exhibits a five-times enhancement of luminescence intensity around 575 nm, compared with the precursor fiber, while retaining its broadband emission. Overall, this work is anticipated to offer a high potential GCF with prominent bandwidth for the direct access of a tunable yellow laser.Keywords:glass-ceramic fiber;broadband;yellow emission
研究领域:
光学
·
材料科学
·
激光技术
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 43
·16740-16747
·
IF 4.569
Liwei Zeng,Jiyou Zhong,Wenbin Lin,Weiren Zhao
Near-infrared (NIR) spectroscopy (700–1100 nm) based on a phosphor-converted light-emitting diode (pc-LED) has multi-functional applications in bio-imaging, night-vision, and food quality analysis, simulating the development of efficient and ultra-broadband NIR phosphors. Herein, a series of tunable and ultra-broadband NIR phosphor Ga2−2xZnxGexO3:Cr3+ was successfully produced by a [Zn2+–Ge4+] unit co-substituting a [Ga3+–Ga3+] unit in Ga2O3:Cr3+. With the increasing amount of [Zn2+–Ge4+] incorporation, the emission peak can be tuned from 726 to 808 nm, and the maximum FWHM can be extended from 126 to 190 nm. However, the excitation peak position remained nearly unchanged in the blue light region, enabling this material to perfectly match the InGaN blue LED chip. Although the gradually enhanced electron–lattice coupling and low energy barrier for thermal quenching caused by this co-substitution lead to a decrease in the photoluminescence quantum yield (PLQY) and thermal stability, respectively, the absolute values of these two criteria can be well maintained. Finally, to evaluate the practical applications, prototype NIR pc-LEDs were fabricated using these materials combined with 450 nm LED chips. Under the same conditions, the NIR output power and photoelectronic conversion efficiency of these devices are superior to those fabricated using the well-known ScBO3:Cr3+ phosphor. These results demonstrate that this series of materials with tunable and ultra-broadband NIR emissions has great potential for NIR pc-LED applications.
研究领域:
材料科学
·
光学工程
·
生物医学成像
·
半导体器件
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Song Wang,Peiqing Cai,Tianmou Xu,Xipeng Pu,Peng Du,Xiangfu Wang,Ying Tang,Xiaolin Yuan,Huacai Chen,Qi Ai,Junjie Si,Xin Yao,Maxim K. Rabchinskii,Pavel N. Brunkov,Zugang Liu
The electronic structure modulations by metal cation doping and organic ligands modification are aroused great interests in perovskite community for spectrum tailoring and quantum yield (QY) enhancement. Herein, we synthesized the two-dimensional (2D) lead bromide perovskite with cyclohexenylethylamine as the organic ammonium ligands and divalent manganese as the doping ions by the combination of facile solution processes and low temperature solid-state method. Thanks to the synergy effects of the steric-hindrance induced self-trapped exciton (STE) by A-site engineering and the elevation of cascaded energy funneling among the FE, STE and the 4 T 1 → 6 A 1 transition of Mn 2+ . The emission spectrum of the Mn 2+ doped 2D perovskite simultaneously covers both the blue and orange range with a QY of 47.01%, where the value is about twelve times of that of the un-doped one at room temperature . Our results indicate that the utilizing of soft organic ammonium and Mn 2+ doping in 2D perovskite could not only adjust the energy level states and improve the QY remarkably, but also explore new opportunities in warm-white LEDs and other applications.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
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
·
光学
·
光子学
·
光谱学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）