JOURNAL OF RARE EARTHS
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2025
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IF 7.2
Jianhua Liu,Jiarui Duan,Deyin Wang,Yuhua Wang
Phytochrome Pr and Pfr are essential for plant growth and photosynthesis, primarily absorbing deep red light at 660 nm and near-infrared (NIR) light at 730 nm. This paper is dedicated to enhance the efficiency of deep red to NIR light emission in BaLu 2– x SiAl 4– y O 12 (BLSA): x Ce 3+ , y Cr 3+ through an energy transfer strategy designed to promote plant growth and improve night vision. It is found that sample doped solely with Cr 3+ can emit deep red to NIR emission in BLSA; however, the spin-forbidden nature of the Cr 3+ 3d→3d transition leads to low luminescence efficiency. On the contrary, in Ce 3+ -doped BLSA, Ce 3+ ions efficiently absorb blue light and emit intense green light, which overlaps the wavelength range of Cr 3+ absorption spectrum. This spectral overlap promotes the energy transfer from Ce 3+ to Cr 3+ , thereby enhancing the deep red to NIR emission of Cr 3+ . This enhancement is evidenced by the external quantum efficiency of Cr 3+ emission, which is 12.5% in the sample doped solely with Cr 3+ and is increased to 48.6% when co-doped with Ce 3+ ions. The energy transfer mechanism between Ce 3+ and Cr 3+ is found to primarily involve dipole-dipole interactions, as described by Dexter's formula and multipole interaction modeling. In addition, by using BLSA:0.1Ce 3+ ,0.03Cr 3+ phosphor to fabricate NIR lighting devices, it is found that the emission spectra are highly matched with the absorption spectra of the phytochromes Pr and Pfr, demonstrating its great potential for application in indoor plant growth lighting. Moreover, the lighting source system is adaptable for various scenarios such as night vision and non-invasive bio-imaging, showcasing its promising versatility for application.
研究领域:
植物学
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光学材料
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植物生理学
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光子学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2022
·Vol. 12
·期 5
·
IF 1.697
Tu Huan,Zhao Guoying,Hou Jingshan,Liu Yufeng,Zhou Yan,Zhang Ganghua,Sun Hong-Tao,Li Ji-Guang,Fang Yongzheng
White light emitting diodes (LEDs) suffer from two most common drawbacks: the deficiency of the red component and the poor thermal stability of silicone. Ce 3+ -doped garnet phosphors with tailor-made luminescence properties can be achieved by variations in {A}, {B}, and {C} cation sites. Herein, a simultaneous ion co-substitution design strategy has been adopted to synthesize a series of (Y, Ca) 3 (Al, Mg) 2 (Al, Si) 3 O 12 garnet phosphors and corresponding phosphor-in-glass (PiG) films. The co-substitution is finely restricted to the assigned sites. The emission peak is shifted from 529 to 565 nm, which is beneficial to obtain low color temperatures and high color rendering using a single phosphor for white LEDs. By employing the as-synthesized phosphor, the corresponding PiG films were fabricated by the low temperature co-sintering technology using the SiO 2 –B 2 O 3 –ZnO–Na 2 O glass system characterized with excellent thermal stability and moisture resistance. The morphological and elemental analyses demonstrated that the as-made phosphor powders were uniformly distributed in the glass host without any interfacial reactions. Finally, modular white LEDs with a high color rendering (Ra = 82.7) is achieved through the as-synthesized PiG film on an InGaN blue chip. This study may open up a facile approach to obtain high quality luminescence based on the mono-luminescence center, avoiding excitation energy wastage and low quantum efficiency aroused by multi-luminescence centers or color compensation phosphors in glass.
研究领域:
材料科学
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光电子学
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固态照明
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无机化学
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应用物理学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Ying Wang,Chao Wang,Luxuan Men,Qingsong Hu,Jiawen Xiao
Rare earth-based halide double perovskites are regarded as an emerging class of X-ray scintillation materials. However, the majority of related scintillator applications are still focused on single crystal and powder systems; the application of nanocrystal (NC) scintillators is rarely reported. Here, we present the synthesis of high-purity Cs2NaTbCl6 NCs by an improved hot-injection method. Interestingly, hollow Cs2NaTbCl6 NCs are observed, the monitoring of the growth process indicates that micrometer-sized NaCl is the initial product, and then the NaCl would convert into Cs2NaTbCl6 NCs through the diffusion of Cs+ and Tb3+ into NaCl lattice, and the faster outward diffusion of Na+ results in the formation of hollow NCs. The double perovskite NCs exhibit green light emission, and the photoluminescence intensity can be significantly enhanced through Ce3+ doping. In particular, the Cs2NaTbCl6:5%Ce3+ scintillator exhibits a linear response and a low detection limit of 79.09 nGy/s when exposed to X-rays. Furthermore, a flexible scintillator film for X-ray imaging is prepared by mixing NCs with polymer, showing a high spatial resolution imaging capability of 10 lp/mm. This work provides a new strategy for hollow perovskite NCs and may shed light on the synthesis of related hollow NCs and their applications in X-ray detection.
研究领域:
材料科学
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纳米技术
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放射学
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闪烁材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Taifang Zhang,Dan Zhang,Zeyu Gao,Baoqi Ai,Valery F. Gremenok,Peng Wang,Chonggeng Ma
The advancement in the development of high-efficiency cyan-green emitting phosphors is pivotal for achieving high-color-quality full-visible-spectrum white light-emitting diodes (WLEDs). In this study, a series of novel cyan-green emitting BaLu 2 Al 3 ScGe 1- y Si y O 12 : x Ce 3+ (BLASGe 1- y Si y O: x Ce 3+ ) phosphors were successfully synthesized. X-ray diffraction analysis confirmed that all samples possess a typical garnet crystal structure, belonging to the Ia 3 ̅ d space group. The emission spectra of these BLASGe 1- y Si y O: x Ce 3+ phosphors effectively bridge the “cyan gap” within the 480–520 nm cyan-green emission region. Under 438 nm blue light excitation, the prepared BLASGO: Ce 3+ phosphor exhibits broad-band cyan-green emission with an emission peak at 504 nm and a full width at half maximum (FWHM) of 103 nm, thereby significantly enhancing cyan emission while preserving green emission. More importantly, by substituting Ge 4+ ions with smaller Si 4+ ions, the internal quantum efficiency (IQE) and thermal stability of the phosphor are markedly improved due to the highly symmetrical rigid structure. The optimized BLASSO: Ce 3+ phosphor demonstrates superior cyan-green emission performance with a high internal quantum efficiency of 93.28 % (an enhancement of 31.23 %) and thermal stability increased to 69.62 %. Based on the developed BLASSO: Ce 3+ cyan-green phosphor, a high-performance full-visible-spectrum WLED device was successfully fabricated, featuring a high color rendering index (CRI or R a , R a = 93.4) and a low correlated color temperature (CCT = 2814 K).
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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发光材料
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 8
·945
·
IF 2.9
Xinye Lu,Haixia Wu,Jisheng Xu,Jianni Chen,Yaqian Huang,Hongliang Li,Jie Song,Rui Huang
Zero-dimensional tin-based halide perovskites have garnered considerable interest owing to their remarkable optical properties, including broad-band emission, high photoluminescence (PL) efficiency, and low self-absorption. Nevertheless, enhancing the PL efficiency and stability of these materials remains a pressing challenge. In this study, the enhancement of PL and stability in Cs4SnBr6zero-dimensional perovskite was investigated through Ce3+doping. Our experimental results demonstrate that the incorporation of Ce3+can significantly boost the light emission intensity from self-trapped excitons (STEs) in Cs4SnBr6, achieving over a 150% increase compared to the undoped sample, with a PL quantum yield of approximately 64.7%. Moreover, the thermal stability of the corresponding doped sample is markedly enhanced. Through comprehensive analyses, including X-ray diffraction, energy-dispersive spectroscopy, time-resolved PL, and temperature-dependent PL measurements, we elucidate that the enhanced light emission is attributed to the distortion of the [SnBr6]4−octahedral structure induced by Ce3+doping, which strengthens electron–phonon coupling and elevates the binding energy of STEs.
研究领域:
材料科学
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光学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 19
·10625-10637
·
IF 14.511
Kun Wang,Xiaobing Huang,Tao Zhou,Dan Sun,Haiyan Wang,Zhi Zhang
The NASICON-type Na4MnV(PO4)3 (NMVP) possesses potential as a cathode material in SIBs, and is known for its stable 3D Na+ superconductive framework, high voltage platform, and relatively low cost and toxicity. Nevertheless, the intrinsic poor electronic conductivity and Jahn–Teller effect from Mn3+ during cycling limit its further application. Herein, to address such issues, a well-designed 3D porous spheroidal Ce3+-doped NMVP@CeO2/C cathode was constructed via a simple spraying drying-assisted route. As proved, the synergistic effect of Ce3+ doping in the crystal framework and CeO2 surface coating was achieved simultaneously, which greatly improved the electronic conductivity, facilitated the ion diffusion transfer and stabilized the crystalline structure. As a result, the as-prepared sample delivered superior discharge performance (50.3 mA h g−1 at 50C) and long circular life (91.0 mA h g−1 after 2000 cycles at 5C with 86.7% capacity retention). Furthermore, the reversible biphasic reaction for cathodes was confirmed by Galvanostatic intermittent titration technique (GITT) and ex situ XRD. The DFT calculation revealed the influence of Ce3+-doping on the crystalline framework and electrochemical properties. Finally, the optimized NMVP cathode also showed great potential for practical utilization through the successful assembly of full cells.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）