ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·126001
·
IF 2.142
Dongxin Shi,Xiaoling Xie,Haiqi Pu,Xi Zhang,Qiang Zhou,Zhengliang Wang,Yanqing Ye,Minghong Chen
A novel red-emitting Rb2KGaF6:Mn4+ phosphor with octahedral particulate morphology was presented. The XRD Rietveld refinement results indicate that the phosphor crystallized into the cubic phase of Fm\overline{3}m space group with double perovskite structure. The photo-luminescence spectrum exhibits intense red emission lines with zero-phonon line (ZPL) and v6 peak locating at 620 and 628 nm respectively. The optical parameters of low color temperature (Tc = 3824 K) and high color rendering index (Ra = 90.2 ) from white LED imply its potential application in solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wanguo Liu,Fuyu Chen,Xiaogen Zhan,Peichang Ouyang
The developments of science and technology have made greenhouse plant cultivation increasingly valued, which has made the research on light sources of great significance, causing that deep-red-emitting phosphors have particular research prospects. In this work, Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under high-temperature solid-state method is synthesized in air and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film is prepared. Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ at room temperature shows deep-red emission in the range of 600 – 800 nm with photoluminescence (PL) peaks at ∼660 and 672 nm because of the 2 E g → 4 A 2g transition of Mn 4+ ion in octahedron [MnO 6 ] when it is excited by light from ultraviolet to green (250–540 nm). PL spectra of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ under different excitation wavelength and the time-resolved PL spectra at room temperature are investigated, which confirm one luminous center (Mn 4+ ). The good thermos-stability is proved by the temperature-dependent PL spectra. The potential applications of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ in plant growth lighting and polymer luminescent film are explored via absorption spectra of plants, PL spectrum of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ , and Li 1.6 Mg 1.6 Sn 2.8 O 8 :Mn 4+ @PDMS film.
研究领域:
材料科学
·
光学
·
植物生物学
·
固体物理
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Haifeng Zhe,Zongqi Chen,Jie Li,Yayun Zhou,Qiang Zhou,Zhengliang Wang
Modulating phase transitions in fluoride phosphors is essential for developing high-performance luminescent materials, but conventional extreme-condition methods often cause structural damage and efficiency degradation. This study proposes a thermal-pressure coupling strategy to achieve reversible Fm-3m to P6 3 mc phase transformation in K 2 SiF 6 :Mn 4+ under mild conditions. The distorted [MnF 6 ] 2- octahedra in the P6 3 mc enhance d-orbital hybridization, significantly reinforcing the zero-phonon line (ZPL). Consequently, luminescence intensity increases by 1.54-fold, external quantum efficiency (EQE) improves by 29.5%, and 90% intensity is retained at 200 °C. LED devices employing P6 3 mc phosphor sheets achieve a color rendering index (Ra) of 84.4 and luminous efficacy of 138.2 lm/W while maintaining stable Ra and correlated color temperature (CCT) across 20 - 300 mA driving currents. Notably, device temperature at 200 mA operation is reduced by 30% compared to conventional methods. This work establishes an effective approach for optimizing fluoride phosphors and advancing high-performance lighting technologies.
研究领域:
材料科学
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光学材料
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固态照明
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发光二极管
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无机荧光粉
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS LETTERS A
·
2019
·
IF 2.087
Renping Cao,Longxiang Xu,Yaqin Ran,Xinyan Lv,Siling Guo,Hui Ao,Ting Chen,Zhiyang Luo
Ba 2 LaSbO 6 :Mn 4+ , Ba 2 LaSbO 6 :Mn 4+ , Dy 3+ , and Ba 2 LaSbO 6 :Mn 4+ , H 3 BO 3 phosphors are synthesized in the air by high temperature solid state reaction method. The particle sizes and sintering degree of Ba 2 LaSbO 6 :Mn 4+ phosphor may be changed by doping Dy 3+ ion and H 3 BO 3 . When the small amount of Dy 3+ ion and H 3 BO 3 are codoped, the emission intensity of Ba 2 LaSbO 6 :Mn 4+ phosphor can be enhanced 1.2–1.3 times and the quantum efficiency of Ba 2 LaSbO 6 :Mn 4+ phosphor can be improved. The lifetime of Ba 2 LaSbO 6 :Mn 4+ phosphor may be changed by doping Dy 3+ ion and H 3 BO 3 . The experimental results are valuable in research of luminescence property of Mn 4+ -doped luminescence materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2016
·
IF 2.183
Renping Cao,Zhihui Shi,Guanjun Quan,Zhiyang Luo,Pengjie Tang,Hui Ao,Xiaoguang Yu
Novel double perovskite Li 3 Mg 2 NbO 6 :Mn 4+ deep red-emitting phosphor is synthesized by solid-state reaction method in air. Emission band peaking at ∼670 nm with chromaticity coordinates (0.722, 0.278) is observed in the range of 600–780 nm due to 2 E → 4 A 2 transition of Mn 4+ ion. Excitation spectrum monitored at 670 nm contains three excitation bands peaking at ∼310, 395, and 470 nm within the range 220–600 nm, which indicate that Li 3 Mg 2 NbO 6 :Mn 4+ phosphor can be excited by ultraviolet, near ultraviolet, and blue light-emitting diode chips. The optimal Mn 4+ doping concentration is about 0.4 mol%. Fluorescence lifetime decreases from 0.485 to 0.32 ms with increasing Mn 4+ ion concentration from 0.2 to 1.2 mol%. Time resolved emission spectra and lifetime data confirm that there is only a single type of Mn 4+ ion luminescent center in Li 3 Mg 2 NbO 6 :Mn 4+ phosphor. The possible luminous mechanism of Mn 4+ ion is analyzed by Tanabe–Sugano energy diagram.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dong Li,Yuexiao Pan,Xunan Wei,Jun Lin
Red phosphors based on Mn 4+ doped fluorides emitting narrow red light under the excitation of blue GaN chips, which can help to improve the luminescence efficiency and color rendering index (CRI) of white light-emitting diodes (WLEDs). In this paper, we carried out a room-temperature synthesis method to obtain a new phosphor of CsNaGe x Sn 1-x F 6 :Mn 4+ (CNGSFM) which contains double-central ions Ge 4+ and Sn 4+ . By controlling the different ratios of the central ions Ge 4+ /Sn 4+ , the contraction and expansion of the matrix lattice CNGSF can be freely changed, which provides a new direction for exploring the trimming method of the lattice effect on the luminescence performance of phosphors. Mn 4+ in CNGSFM shows weak stability and its luminescence quenches fastly in humid environments , so that we explored a facile strategy to improve its humidity resistance. Furthermore, the quenched luminescence of the CNGSFM can be restored through surface modification. Therefore, our results not only establish the tunable mechanism between luminescence performance and microstructure, but also provide a feasible strategy to improve the humidity resistance of Mn 4+ doped double-composite fluoride phosphors.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 17
·5711-5721
·
IF 4.174
Haipeng Ji,Xinghui Hou,Maxim S. Molokeev,Jumpei Ueda,Setsuhisa Tanabe,Mikhail G. Brik,Zongtao Zhang,Yu Wang,Deliang Chen
Blue light pumped red luminescence with broadband and high photon-energy emission is highly desired for phosphor-converted white light-emitting diodes (pc-wLEDs), to achieve a high color rendering index and high luminous efficacy. Mn4+-doped red-emitting phosphors generally exhibit sharp vibronic emissions associated with the parity- and spin-forbidden 2Eg → 4A2g transitions. In this paper, two abnormal luminescence behaviors were observed for Mn4+ in the MgAl2O4:Mn4+ spinel phosphor with a short wavelength emission band peaking at 651 nm. Firstly, the Mn4+ 2Eg → 4A2g transition exhibits ultrabroadband luminescence in MgAl2O4 and the large full-width at half-maximum (FWHM) is dependent both on the calcination temperature and on the partial substitution of Al3+ with Ga3+. Secondly, the thermal quenching behavior of the Mn4+ 2Eg → 4A2g luminescence in MgAl2O4 shows a dependence on its thermal treatment and preparation method. The Rietveld refinement and Raman results demonstrate that the variation in the FWHM of the luminescence spectra is a sum effect of structural ordering (i.e., isotropic displacement decrease of constituent atoms) and the Mg ↔ Al anti-site disorder. A model for the observed varying thermal quenching of luminescence was tentatively proposed. The intrinsic thermal quenching temperature of Mn4+ luminescence in MgAl2O4 was found to be 390–400 K using the samples prepared by the co-precipitation and molten salt methods. The present work gives a novel perspective to understand the luminescence spectra of Mn4+ 2Eg → 4A2g transition.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 22
·10875-10883
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IF 3.3
Cong Ding,Zhongfa Li,Wenjun Zhang,Jun Ou,Xue Wen,Chengyue Xin,Min Su
The optical properties of Mn4+-activated phosphors are heavily affected by the host and the related data are difficult to obtain, which makes quantitative design of novel phosphors with required wavelength particularly challenging. In the era of big data, computation is emerging as a vital complement to materials development. Compared with traditional calculation routes, machine learning (ML) models provide better solutions for the problems wherein understanding the underlying physics is complicated with sparse data. In this study, we developed six ML models based on a sparse and small data set to rapidly predict the peak emission wavelength of novel phosphors and use Recursive Feature Elimination (RFE) to select the best features. Among them, the K-nearest neighbors regression (KNN.r) algorithm using non-parametric regression technology can predict the value of the target variable based on the similarity between the target value and its spatial neighbors, which can tackle sparse data sets with no obvious linear relationship well and has the best prediction accuracy. These models were then used to predict 278 potential Mn4+-activated phosphor hosts extracted from the inorganic crystal structure database (ICSD), and 19 samples were selected to validate these methods. In order to overcome the lack of physical and chemical insight of KNN, a visual data analysis was carried out based on hierarchical clustering analysis (HCA), and the rule between the peak emission wavelength and the structure of host was proposed. Guided by the results of KNN and HCA, six samples were selected for the synthesis and characterization to verify our conclusions. The measured values of all these phosphors exhibit good agreement with the predicted results, suggesting the success of our methodology. Thus, the model established and the rule proposed in this paper provide a new pathway for the rapid discovery of novel phosphors.
研究领域:
材料科学
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光学
·
数据科学
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Bingjie Han,Xinyu Chang,Haili Jiang,Yuhan Wang,Fengjun Tian,Kang Li,Sivagunalan Sivanathan,Xinghua Yang
Red inorganic phosphors are widely utilized in the field of artificial plant supplemental lighting. Nevertheless, their red light emission falls short of satisfying the plant's dual requirements for both deep-red and far-red light simultaneously. In this work, multiple red emission Sm 3+ and Sm 3+ -Mn 4+ activated CaGdMgNbO 6 (CGMNO) red phosphors were prepared by high-temperature solid-state reaction. The luminescence characteristics, thermal stability, energy transfer behaviour and optical temperature sensing properties were investigated. The 550–750 nm emission bands of CGMNO:Sm 3+ and CGMNO:Sm 3+ , Mn 4+ matched the absorption band of the plant. The inhibition of energy transfer between activated ions and the structural reconstruction of conduction band traps reveal the anomalous thermal quenching behavior of Sm 3+ ions at high temperatures. These results show that Sm 3+ -Mn 4+ co-activated CGMNO phosphors have potential applications in plant growth.
研究领域:
材料科学
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植物学
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 9
·1562-1571
·
IF 2.9
Fadong Li,Yaosen Ye,Ruirui Cui,Jun Zhang,Cong Xu,Hui Xu,Gangyi Zhang,Chaoyong Deng
A series of Mn 4+ -doped and Mn 4+ ,K + -co-doped Ba 2 LaTaO 6 (BLT) double-perovskite phosphors was synthesized using a high-temperature solid-state reaction. The phase purity and luminescence properties were also studied. The optimum doping concentration of Mn 4+ and K + was obtained by investigating the photoluminescence excitation spectra and photoluminescence emission spectra. The comparison of BLT:Mn 4+ phosphors with and without K + ions shows that the photoluminescence intensity of K + -doped phosphors was greatly enhanced. This is because there was a charge difference when Mn 4+ ions were doped with Ta 5+ ions in BLT. Mn 4+ –K + ion pairs were formed after doping K + ions, which hinders the nonradiative energy transfer between Mn 4+ ions. Therefore, the luminescence intensity, quantum yield, and thermal stability of phosphors were enhanced. The electroluminescence spectra of BLT:Mn 4+ and BLT:Mn 4+ ,K + were measured. The spectra showed that the light emitted from the phosphors corresponded well with chlorophyll a and phytochrome P R . The results show that the BLT:Mn 4+ ,K + phosphors had good luminescence properties and application prospects and are ideal materials for plant-illuminated red phosphors.
研究领域:
材料科学
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植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 10
·5077-5085
·
IF 3.784
Zhaowu Wang,Haipeng Ji,Zongtao Zhang,Jian Xu,Deliang Chen
The cation exchange method has been demonstrated to be efficient in doping Mn 4+ ions into various fluorides to synthesize the red-emitting LED phosphors. This paper, however, reports the challenge in using this method to dope Mn 4+ into the Na 2 SiF 6 single crystals, to prepare the fluoride phosphor in single-crystal form, a state-of-the-art study in the white LED lighting field. The millimeter-sized Na 2 SiF 6 single crystals with a uniform columnar morphology (2–3 mm in length) were successfully grown in solution by a slow cooling process after optimizing the precursors. Then, the crystals were soaked in the HF solution dissolved with K 2 MnF 6 to implement Mn 4+ -doping via the cation exchange process. Evaluation of the Mn 4+ -doping behavior reveals that the Mn 4+ ↔ Si 4+ cation exchange is less efficient in the case of single crystal host compared with the polycrystalline powdery ones and by-reactions also occur which generates new phases. The Na 2 SiF 6 single crystals doped with Mn 4+ exhibit a series of discrete sharp peaks with intense zero phonon line emission at 617 nm under 450 nm blue irradiation. This study may trigger the exploration of new single crystal fluoride phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 21
·1-15
·
IF 2.8
Yang Chong,Long Juling,Li Bin,Ma Rongbo,Cao Bin,Huang Weichao
A series of Sr 3 LiSbO 6 : Mn 4+ and Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ red phosphors were synthesized using the high-temperature solid-state method. The phase, luminescence properties, and thermal stability of these phosphors were thoroughly investigated. The Sr 3 LiSbO 6 : Mn 4+ phosphors exhibited a strong far-red emission band ranging from 650 to 750 nm centered at 693 nm, which is attributed to the 4 E 2g → 4 A 2g transition of Mn 4+ . To further broaden the emission spectra of the Sr 3 LiSbO 6 : Mn 4+ phosphors, doping with Sm 3+ ions as a co-activator was performed. The Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ phosphors exhibited two emission bands located at 601 nm and 693 nm (red and far red), which are well-matched with the absorption bands of phytochromes Red (P R) and phytochromes Far-Red (P FR) . Additionally, the emission intensity and thermal stability of the phosphors were improved. Sr 3 LiSbO 6 : Mn 4+ emits far-red light in the range of 650 nm-750 nm, while Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ emits red light in the range of 500 nm-750 nm. In the context of Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ , we designed a LED lamp for plant growth and carried out experiments on plant seed germination. The findings from these experiments demonstrate the positive impact of red LEDs on plant growth and development. Additionally, our results suggest the potential application of red phosphors with Sr 3 LiSbO 6 : Mn 4+ , Sm 3+ in plant growth.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）