OPTICAL MATERIALS
·
2025
·
IF 4.2
Chen-Yang Qi,Dan Zhao,Rui-Juan Zhang,Qing-Xia Yao
Mn 4+ has garnered significant global interest due to its application in red light emission, particularly within the realm of plant growth lighting. However, there are relatively few studies focusing on the incorporation of Mn 4+ into titanate materials. In this research, we synthesized a series of Ba₆Y₂Ti 4-x O₁₇ (BYT: x Mn⁴⁺) phosphors with varying concentrations of Mn 4+ using a high-temperature solid-state synthesis method. Initially, we confirmed the structural integrity and phase purity of the samples through X-ray diffraction (XRD) analysis and refinement techniques. The experimental results indicate that under near-ultraviolet (UV) excitation, these phosphors emit far-red light at approximately 700 nm. Furthermore, their emission spectra align closely with the spectral requirements of chlorophyll and photoreceptive pigments (P r and P fr ), which are essential for optimal plant growth. This characteristic makes them promising candidates for plant cultivation applications. Consequently, we posit that BYT:0.015Mn⁴⁺ represents a novel titanate-based far-red emitting material with considerable potential for use in LED lighting systems designed for plant growth particularly in enhancing photosynthetic efficiency and promoting overall plant development.
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 30
·9925-9933
·
IF 4.029
L. Y. Wang,E. H. Song,T. T. Deng,Y. Y. Zhou,Z. F. Liao,W. R. Zhao,B. Zhou,Q. Y. Zhang
Herein, a Mn4+ ion doped complex ternary-alkaline fluoride red phosphor K2NaAlF6:Mn4+ has been synthesized through a facile two-step co-precipitation method at room temperature. The crystal structure, morphological properties and influence of the dopant concentration, temperature and humidity on luminescence properties as well as the performance of the as-synthesized phosphor used in white light emitting diodes (WLEDs) were investigated carefully. Intense absorption in the blue region (∼460 nm) and bright narrow-band red emission (∼630 nm) with high color purity were observed from this resultant powder. Temperature-dependent investigation and reliability examination in a HTHH environment (85 °C high temperature and 85% high humidity) indicate that the obtained ternary-alkaline fluoride phosphor K2NaAlF6:Mn4+ presents more exceptional thermal quenching behavior and longevity compared to some other binary-alkaline fluorides. Moreover, using K2NaAlF6:Mn4+ as a red light component, a warm WLED with a preferable color rendering index (Ra = 85.5) and luminous efficacy (LE = 91.2 lm W−1) as well as a low corresponding color temperature (CCT = 3650 K) is easily achieved, further revealing the great potential of the as-prepared ternary-alkaline fluoride red phosphor K2NaAlF6:Mn4+ for WLED applications.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Changran Zheng,Zhoudong Yang,Huimin Xu,Bobo Yang,Jun Zou,Tianhe Lu,Xi Zhu,Mingqing Pan,Sergey Lishik,Jiajie Fan
KGe 2 F 6 :Mn 4+ phosphors exhibit a narrow emission peak at 625 nm with a FWHM of only 3-5 nm, enabling their widespread use in smartphones, televisions, and automotive displays. However, as an ionic crystal consisting of K + and [GeF 6 ] 2- units with relatively weak electrostatic bonding, KGF easily develops surface water films under high-temperature and high-humidity conditions, leading to K + migration and accelerated luminescence degradation. In this study, a rapid Plasma-Assisted Film Deposition (PAFD) technique was employed to construct a nanoscale silica layer with a thickness of approximately 200 nm on KGF phosphor particles, followed by hygrothermal aging tests at 100 °C and 100 % RH. Arrhenius kinetics modelling and analysis revealed that the coating increased the apparent activation energy from 20.05 to 21.35 kJ mol −1 , suggesting improved resistance against hygrothermal degradation. First-principles calculations confirmed that water was physisorbed on all crystal facets, with the (021) surface exhibiting the highest adsorption energy (−0.80eV). Furthermore, 5 ps ab initio molecular dynamics (AIMD) simulations demonstrated that adsorbed water induced K + displacement from lattice sites, a phenomenon that intensifies with increasing temperature. The nanoscale silica coating effectively suppresses this migration. These findings demonstrate that the rapid plasma-assisted coating strategy significantly enhances KGF's hygrothermal stability and ensures reliable performance in demanding harsh environments.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 20
·1575
·
IF 3.2
Liao Mingyu,Li Gan,Yang Heyi,Mao Qinan
Far-red phosphors have garnered significant research interest due to their essential function in plant growth lighting. Nevertheless, the development of plant lighting technologies is constrained by the relatively low efficiency and inadequate thermal stability of oxide‑based deep-red-emitting phosphors. In this work, we synthesize the far-red Mn 4+ -doped double perovskite-structured oxides Ba 2 MgWO 6 (BMWO: Mn 4+ ) by the high-temperature solid-state method and enhance its luminescence through dual-substitution strategy. By substituting Mg 2+ with Gd 3+ and Ca 2+ , the emission intensity of BMWO: Mn 4+ has been increased from the initial 100 to 425 and 3716%, respectively, while the quantum yield improves from 0.2 to 89.9%. Meanwhile, BaCa 0.9 Gd 0.1 WO 6 : Mn 4+ (BC 0.9 G 0.1 WO: Mn 4+ ) also possesses excellent thermal stability, retaining 78.2% of its initial intensity at 423 K. Based on crystal structure analysis and electron cloud characterization, we found that the enhancement of Mn 4+ luminescence originates from the modulated crystal field environment of Mn 4+ , which affects the lattice symmetry of the [WO 6 ] octahedra as well as the vibrational stretching modes. Finally, the pc-LEDs based on BC 0.9 G 0.1 WO: Mn 4+ exhibits strong overlap with the plant phytochromes P R /P FR . This work offers both a strategy for tuning Mn 4+ emission and a practical example for designing artificial lighting systems in plant cultivation.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yue Zhong,Jing Xie,Chao Wang,Tao Su,Yang Li,Wenming Wang,Yan Pan,Xiantao Wei,Yong Li
The advancement of modern artificial plant cultivation necessitates the development of high-performance far-red-light sources precisely tailored to plant spectral absorption profiles, which is crucial for enhancing crop yield and quality in contemporary agricultural practices. In this study, a cation substitution strategy was implemented by replacing Ba 2+ ions with smaller Ca 2+ cations to induce unit cell contraction. This structural modification reduces the degree of distorted octahedral coordination available for Mn 4+ substitution, effectively suppressing non-radiative transitions. As a result, the optimized phosphor exhibits a threefold enhancement in emission intensity along with significantly improved thermal stability. Furthermore, the incorporation of H 3 BO 3 as a flux agent enhanced crystallinity, synergistically boosting both luminescent performance and thermal stability. The resultant Mn 4+ -activated phosphor achieves a quantum efficiency of 81.2 % with characteristic far-red emission peaking at 708 nm. Fabricated far-red phosphor-converted light-emitting diodes and photoconversion films incorporating this phosphor demonstrate exceptional potential for precision-controlled plant growth modulation.
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Meilan Hu,Chenxing Liao,Libin Xia,Weixiong You,Zhifeng Li
A series of Mn 4+ doped La 2 MgTiO 6 red-emitting materials with double-perovskite structure and high efficient red emission have been successfully prepared by molten salt assisted method which LiCl acting as molten salt at a relatively low temperature. The effects of the reaction temperature and the usage amounts of LiCl on the structure and photoluminescence properties of phosphors were studied. Experimental results indicate that the synthesis temperature of the Mn 4+ -doped La 2 MgTiO 6 by molten salt method is only 800 °C while the traditional solid phase method requires 1350 °C. The morphology and particle size of phosphors can be well controlled by adjusting the reaction temperature and the amount of molten salt. The thermal stability and quenching mechanism of phosphors were studied by temperature dependent emission spectra , which demonstrated that LiCl is benefit to improve the thermal stability of the Mn 4+ activated La 2 MgTiO 6 phosphors.
研究领域:
材料科学
·
发光材料
·
无机化学
·
固态物理
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Hua Yu,Renguang Ye,Huanping Wang,Shilong Zhao,Degang Deng,Shiqing Xu
Single doped Mg 0.388 Al 2 O 3.408 O 4 phosphor was prepared and multivalent Mn ion (Mn 2+ and Mn 4+ ) emission was achieved in a single host. The structure, morphology, and luminescence characteristics of Mn ions in Mg 0.388 Al 2 O 3.408 O 4 were discussed in detail, especially the temperature dependent emission characteristics of Mn ions. Based on the fluorescence intensity ratio (FIR) of Mn 2+ versus Mn 4+ and the decay lifetime of Mn 4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 293–473 K. The maximum relative sensitivities ( S r ) are derived as 2.83 % K −1 (at 373 K based on FIR) and 3.40 % K −1 (at 473 K based on decay lifetime), respectively. The temperature sensing characteristics of Mg 0.388 Al 2.408 O 4 : Mn 2+ /Mn 4+ powders in a full fiber system were studied, which can provide thermal-sensitive emissions at dual-wavelengths for stable ratiometric temperature sensing with good precision and repeatability. The constructed all fiber temperature sensing system has been applied in the on-line monitoring of CPU temperature.
研究领域:
光学传感器
·
发光材料
·
温度传感
·
光纤技术
·
荧光粉材料
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 11
·3865-3874
·
IF 6.4
Sheng Wu,Shanshan Hu,Quan Liu,Shuai Zhang,Dongliang Jiang,Guoxing Zhang,Yakun Le,Yao Xiao,Binli Xiao,Puxian Xiong,Yan Chen,Yinzhen Wang
Luminous properties play an essential role in phosphor-converted white light-emitting diodes for high-quality illumination, where the self-reducing behavior of doped activators and their excellent thermal stability have received significant attention. Here, we prepared NaY9Si6O26:Mn2+ red phosphors by a high-temperature solid-state reaction method, which achieved self-reduction of Mn4+ → Mn2+ and excellent thermal stability (luminous intensity at 420 K is 98% of that at room temperature) under ambient conditions. First-principles calculations and X-ray photoelectron spectroscopy elucidated a self-reduction mechanism from Mn4+ to Mn2+. The defect types were calculated in conjunction with thermoluminescence, verifying that the low thermal quenching properties originated from the transfer of electrons from the defect energy level to the Mn2+ excited state center induced by the cationic vacancy defect, which suppressed the luminescence loss from thermal quenching. In this work, the effect of defects on luminescence properties is highlighted and the further exploration of defect control is stimulated, opening up a new avenue for new types of highly thermally stable materials.
研究领域:
材料科学
·
光子学
·
固态化学
·
发光材料
·
LED技术
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 8
·4373-4383
·
IF 3.502
Yongli Zhang,Yuding Huang,Minghui Li,Chao Liang,Haifeng Zhu,Yuan Zhong,Nan Yang,Zhi Zhou,Mao Xia
To fulfil the demands of high-power plant growth lamps, cation co-doping is an effective way to tune the photoluminescence properties of manganese (Ⅳ)-activated aluminate phosphors. Therefore, we managed to synthesize a series of cations co-doped CaYAlO 4 : x Mn 4+ , m Sr 2+ , M + (M + = Li + , Na + , and K + ) (CYAO:Mn, Sr, M) far-red-emitting phosphors. The excitation spectrum of these phosphors contained two excitation bands, and the opposite effects of these two bands on the luminescence intensity have been observed with the increase of Mn 4+ concentration. By adding 0.1 mol Sr 2+ ions to replace Ca 2+ site, the emission intensity and thermal stability of CYAO:Mn phosphors can be enhanced. Furthermore, the luminescence properties of CSYAO:Mn can be further improved by co-doping monovalent alkali metal ions to serve as charge compensators, the increased number of Mn 4+ luminescence centers. Moreover, 0.6 mol% Na + can increase the initial emission intensity of the phosphors by 117% as the best ratio. The characteristic emission spectrum of the phosphors CYAO:Mn,Sr,M correspond to the phytochrome P FR of plants. These experiments and characterization results have certified that these phosphors have a potential application in indoor plants cultivation.
研究领域:
材料科学
·
光学材料
·
园艺照明
·
荧光粉化学
·
室内农业
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Chunyan Zhou,Hua Fan,Jinling Huang,Shu Li,Yaoyao Huang,Meiping Huang,Yin Huang,Xinjing Guo,Liya Zhou
Broad red emitting phosphors are essential for the growth of indoor plants. Previous Mn 4+ -activated far-red phosphors typically displayed narrow emission, which could not well overlap with plant pigment absorption. A high temperature solid state technique was used to create the unique double perovskite LaGeSbO 6 :Mn 4+ phosphor with an emission peak centered at 700 nm and an impressive full width at half maximum (FWHM) of 100 nm. The origin of ultra-broadband emission of LGS:Mn 4+ phosphors was confirmed by crystal structure and time-resolved spectra owing to the occupation of the two octahedral [SbO 6 ] and [GeO 6 ] centers by the Mn 4+ ion. The quenching mechanism is brought about by the dipole-dipole interaction. The broadband emission is substantially broader than that of other Mn 4+ -activated red emitting phosphors previously described. Besides, the emission spectrum of LaGeSbO 6 :0.4%Mn 4+ matches well with the phytochrome P FR absorption band for plant development. All of the findings suggested that the novel LaGeSbO 6 :Mn 4+ phosphor could be potentially used in light-emitting diodes for indoor plant culture.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yi Zhang,Cuiping Zhou,Jingwei Li,Jing Dong,Shuai Weng,Pengfei Yin,Xiyuan Sun,Jian Wang,Zhiwei Lu,Hanbing Rao
Herein, a novel Ba 2 SrWO 6 :Mn 4+ , La 3+ (BSW:Mn 4+ , La 3+ ) far-red phosphor was obtained by an addition strategy of La ion to negligible-luminescence BSW:Mn. Deep-red emission peaks at ∼ 664, 679 and 690 nm were observed for BSW:Mn 4+ , La 3+ with the excitation band in the 250 ∼ 600 nm spectral range, which are well matched to the absorption of chlorophyll and phytochromes. An impressive nanorod surface micro-morphology was observed in BSW samples and the size of the surface-grown nanorods can be changed by the addition of La ions. It was speculated that the generation of oxygen vacancies in BSW:Mn probably causes the self-reduction process of Mn 4+ → Mn 2+ , and a charge replenishment mechanism was proposed to explain the abnormal luminescence of Mn 4+ ions. The BSW:0.5%Mn, 5%La phosphor showed a CIE chromaticity coordinate of (0.724, 0.276) with a high color purity of 100%. In addition, the internal and external quantum efficiency of BSW:0.5%Mn, 5%La phosphor reach as high as 51.9% and 39.5%, respectively. Finally, LED devices were fabricated by using the as-prepared BSW:0.5%Mn, 5%La phosphor and applied in the illumination on tomato seeds. It shows that the LED devices can promote the seeding of tomatoes effectively, indicating a potential application value in the plant cultivation field.
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高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Zhu Peide,Zhao Xuelin,Zhang Yuqi,Liu Yinping,Zhao Ziyi,Yang Ziji,Liu Xinzhu,Zhang Weiye,Guo Zixuan,Wang Xiao,Niu Yingchun,Xu Meng
Carbon dots (CDs), a new zero-dimensional material, have ignited a revolution in the fields of sensing, bioimaging, and biomedicine. However, the difficulty of preparing CDs with Fenton-like catalytic properties has seriously hindered their application in the diagnosis of oxidation/reduction biomolecules or metal ions. Here, an innovative method was successfully established to synthesize Mn3+/Mn4+ ion-doped blue-green fluorescent CDs with Fenton-like catalytic properties using manganese acetate as the manganese source. Specifically, the CDs prepared here were equipped with functional groups of -COOH, NH2, C=O, and Mn-O, offering the possibility to function as a fluorescence sensor. More importantly, the introduction of manganese acetate resulted in the preparation of CDs with Fenton-like catalytic properties, and the dual-signal fluorescence detection of dopamine (DA) was realized with linear ranges of 100–275 nM and 325–525 nM, and the detection limits were 3 and 12 nM, respectively. In addition, due to the Fenton-like catalytic activity of Mn3+/Mn4+ ion-doped CDs, the material has broad application prospects in the detection of oxidation/reduction biomolecules or metal ions related to disease diagnosis and prevention.
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DOI
PubMed
高影响因子
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