CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36114-36122
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IF 5.6
Mengchao Shen,Li Li,Mengnan Zhai,Zhongmin Cao,Faling Ling,Xianju Zhou,Yongjie Wang,Xiantong Tang,Xiaobing Luo,Yongbin Hua
In this study, a novel near-infrared (NIR) emitting double-perovskite phosphor SrLaMgSbO 6 :Cr 3+ (SLMSO: Cr 3+ ) was prepared through a solid-state reaction method. Through systematic investigation of Cr 3+ concentration-dependent photoluminescence properties, we identified SLMSO:0.02Cr 3+ as the optimal concentration composition exhibiting superior optical characteristics . Comprehensive characterization techniques were employed to analyze the crystal structure, morphological features, excitation-emission profiles, and crystal field environment of the developed phosphor. The as-synthesized phosphor demonstrates remarkable broadband NIR emission centered at 850 nm upon 520 nm excitation, which is attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ ions in the weak crystal field environment of the double-perovskite host. A particularly noteworthy finding is the exceptional thermal stability of the material, maintaining 86.7 % of its room-temperature (298 K) emission intensity at 423 K. Finally, we fabricated a NIR pc-LED device by integrating the optimized SLMSO:0.02Cr 3+ phosphor with a commercial 530 nm LED chip, promising applications in night vision technology and penetration imaging systems . The combination of broadband NIR emission, superior thermal stability, and efficient excitation by commercial LED chips positions this novel phosphor as a significant advancement in the field of NIR-emitting materials for practical applications.
研究领域:
材料科学
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光学工程
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固体物理
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功能材料
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光电探测
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kechen Zhang,Haojing Xu,Yuhe Shao,Zaisheng Wen,Ting Wang,Mingyue Chen,Zhen Song,Quanlin Liu
Achieving excitation-free, long-range target surveillance under complete darkness remains a critical challenge for night-vision technology. Here, a breakthrough is reported in near-infrared (NIR) persistent luminescence (PersL) materials designed specifically for this frontier. Through strategic bandgap engineering via Sm 3 ⁺ co-doping and In 3 ⁺ solid-solution incorporation in the novel Cr 3 ⁺-doped Mg 3 Ga 1.9 In 0.1 SnO 8 spinel phosphor, the afterglow intensity and duration are dramatically enhanced. The optimized material exhibits an ultra-long NIR PersL exceeding 168 h. Crucially, PDMS films embedded with this phosphor enabled real-time, persistent target detection at an unprecedented distance of 47.5 m in complete darkness, entirely without any external excitation source. This record-setting long-range performance demonstrates the material's potential as an enabling technology for passive, long-range nighttime surveillance systems. Comprehensive spectroscopic studies elucidate the underlying PersL mechanism. This work establishes a new pathway for designing ultra-long NIR PersL materials and paves the way for advanced applications in remote night-vision technologies.
研究领域:
材料科学
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光学材料
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光子学
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夜视技术
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远程传感
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 31
·10694-10702
·
IF 6.4
Yiwen Zhu,Yifan Yang,Yongqi Zhu,Yifan Chen,Zhenyu Liu,Fengmeng Lei,Hua Yu,Qinan Mao,Jiasong Zhong,Jing Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have been attracting considerable attention as a new solid-state light source for night vision technology and biological imaging applications. Nevertheless, the requirement for toxic and concentrated HF in the previous synthesis of fluoride phosphors may cause environmental pollution and safety problems. Here, we report a feasible HF-free green synthesis method using a two-step process to prepare the Cr3+ source and a series of Cr3+, Li+ doped NIR phosphors using aqueous solution and methanol solution. X-ray diffraction analysis indicates that the pure target material was successfully synthesized. The luminescence intensity of K2ZnF4:Cr3+,Li+ is 2.58 times improved compared with K2ZnF4:Cr3+. Furthermore, the prepared phosphors show broadband emission in the range of 650 to 1000 nm, with a full width at half-maximum (FWHM) of 139 nm peaking at 783 nm. The NIR output power of the pc-LED fabricated with the K2ZnF4:Cr3+,Li+ phosphor and a 450 nm blue chip reaches 1007 mW at 320 mA. This work provides a promising phosphor for application as a NIR light emitting diode and has important implications for the green synthesis of HF-free Cr3+-doped fluorides in the future.
研究领域:
材料科学
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光电
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化学
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环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Yang,Wei Lü,Jin Xiang Lim,Biao Wang
There is strong demand of exceptional efficiency for near-infrared (NIR) phosphors for next-generation integrated and intelligent multifunctional light-emitting diode (LED) devices. Designing NIR phosphors with excellent efficiency that simultaneously meet multiple application requirements is challenging. Hence, this work focuses on the NIR optical properties and the corresponding multifunctional applications for Cr 3+ activated LaMgAl 11 O 19 (LMAO) phosphors. The blue light excitable LMAO:Cr 3+ phosphors can produce intense NIR emission ranging from 630 to 1000 nm with an 95.8% internal quantum efficiency as well as excellent thermal stability (I 423 K /I 303 K = 75.9%). Additionally, benefiting from the strong correlation between fluorescence lifetime and ambient temperature, the LMAO:Cr 3+ phosphors were showed promising potential for application in temperature sensing. Notably, the NIR phosphor-converted LED devices based on LMAO:Cr 3+ phosphors and commercial blue LED chip were self-built, which exhibiting great potential for indoor plant cultivation, night vision, and nondestructive detection. This study describes the highly efficient LMAO:Cr 3+ phosphors preparation and the corresponding multifunctional applications in the fields of optical thermometry, indoor plant cultivation, night vision, and nondestructive detection, which is crucial for the next-generation integrated and intelligent multifunctional LED devices.
研究领域:
材料科学
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光学工程
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固态照明
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温度传感技术
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植物生长技术
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无损检测
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）