JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jinsheng Liao,Minghua Wang,Zhuo Han,Junxiang Huang,Guoliang Gong,Junxiang Fu,He-rui Wen
A new far-red/green dual-emitting phosphor La 2 ZnTiO 6 :Mn 4+ /Er 3+ (LZT:Mn 4+ /Er 3+ ) was successfully synthesized by the sol-gel method. Under 381 nm excitation, LZT:Mn 4+ /Er 3+ phosphor shows the strong far-red emission peak of 709 nm (Mn 4+ : 2 E g → 4 A 2g ) and weak green emission peak of 523/548 nm (Er 3+ : 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ), which consistent with the requirement of plant growth for far-red and green light. A 1.5-fold enhancement of far-red emission intensity is found in LZT:Mn 4+ /Er 3+ phosphor compared with the Mn 4+ singly-doped counterparts. Moreover, the relative emission intensity of far-red and green can be easily controlled by changing temperature. Utilizing the optimal LZT:0.2%Mn 4+ /2%Er 3+ phosphor as plant lighting, a prototype near-UV-pumped LED device was fabricated. Upon 120 mA driving current, it demonstrated far-red/green dual emission. All the results indicated that the LZT:Mn 4+ /Er 3+ phosphor is a potential material for plant growth illumination with far-red/green light.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Chao Hu,Lan Luo,Rui Guo,Ziying Ma,Ye Liu
Mn 4+ -active far-red emitting garnet phosphors are attractive in plant cultivation for chemical/physical stability and emission band well matching with the phytochrome absorption. (La 1-x Y x ) 3 Li 5 Sb 2 O 12 : Mn 4+ (x = 0∼0.4) garnet phosphors were fabricated by solid-state reaction in this work. The powder could exhibit far-red emission centered around 717 nm (related to Mn 4+ 2 E g → 4 A 2g transition), with the highest luminescence quantum efficiency ( QE ) and thermal quenching temperature ( T 0 . 5 ) reaching 38.03 % and 520 K, respectively. Comparing with La 3 Li 5 Sb 2 O 12 :Mn 4+ , the properties have been improved significantly, with double in QE and 20 K higher in T 0.5 . Y 3+ cation substitution would lead a stronger crystal field (verified by D q /B calculation) and a less spin-orbit coupling (verified by EPR spectra), and result in a smaller energy splitting and centroid shifting in 2 E g level. Then the luminescent efficiency and thermal stability would be improved a lot. The work not only provides a new far-red-emitting phosphor but also offers a strategy for Mn 4+ -active luminescence material improvement.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qinan Mao,Gan Li,Xinyu Shen,Junhua Xi,Lang Pei,Xinyue Li,Jiasong Zhong
Currently, Mn 4+ -activated phosphors have attracted extensive attention for their versatile applications in general lighting, display and plant cultivation. Owing to 3d 3 electronic configuration of Mn 4+ ion, modifying its local coordination environment emerges as a potent method to tailor its luminescence behavior. Herein, a heterovalent substitution strategy is reported to greatly enhance the photoluminescence (PL) of Ba 2 CaWO 6 :Mn 4+ . The effects of the substitution of rare-earth ions (Ln 3+ = Lu 3+ , Y 3+ , Gd 3+ , La 3+ ) for Ca 2+ ions on the PL properties of the phosphor are studied in detail. The PL spectral change of Mn 4+ induced by Ln 3+ substitution is clarified in terms of the local structure of [WO 6 ] octahedron and the valence state of Mn. By selection of Ln 3+ ions and optimization of Ln 3+ doping concentration, the emission intensity of Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor reaches up to 46.3 times as that of Ba 2 CaWO 6 :0.25Mn 4+ . Besides, the Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor exhibits an internal quantum yield of 56.9 % and a thermal stability of 72.6 %@423 K. Finally, Ba 2 Ca 0.85 Ln 0.15 WO 6 :Mn 4+ based phosphor conversion LED devices are demonstrated, which can be potentially employed for indoor plant lighting.
研究领域:
材料科学
·
光电技术
·
照明技术
✓ 已验证
DOI
高影响因子
Solids
·
2025
·Vol. 6
·期 3
·53
·
IF 2.4
Chenxing Liao,Huihuang Cai,Dongyuan Dai,Liaolin Zhang
Mg2TiO4:Mn4+(MTO:Mn4+) red phosphor has important applications in areas such as red LEDs and forensic science, but the preparation of MTO:Mn4+through the solid-state reaction method requires a high sintering temperature. Herein, MTO:Mn4+red phosphor was synthesized using the solid-state reaction method with LiCl flux, and its crystallographic structure and photoluminescence properties were studied to determine the influence of experimental parameters like the amount of fluxing agent added and sintering temperature in producing a bright red phosphor suitable for LEDs. The experimental results showed that samples with added LiCl could form pure MTO after sintering at 950 °C, whereas those without LiCl still contained a mixture of MTO and MgTiO3, even when sintered at 1400 °C. The optimal performance was achieved with a sample doped with 0.2 mol% Mn4+, synthesized using 50 wt% LiCl flux and sintered at 950 °C for 12 h. This sample exhibited a broad excitation band and a narrow red emission band peaking at 662 nm, confirming its excellent luminescence properties. Furthermore, a prototype red LED fabricated with a 377 nm chip and MTO:0.2% Mn4+phosphor achieved photoelectric conversion efficiency of 78.5% at a 100 mA drive current, confirming its viability for high-performance red LED manufacturing.
研究领域:
材料科学
·
发光材料
·
无机化学
·
固体化学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11419-11428
·
IF 2.195
Zhao Caiyue,Xu Yudong,Wang Lei,Chen Xinyi,Hu Wenjie,Dai Zhaoxiang,Hu Mengyuan,Liu Kai,Shi Min
In this study, Bi 3+ and Mn 4+ co-doped CaAl 12 O 19 phosphors were prepared via high-temperature solid-state reaction method, and their crystal structure, particle morphologies, luminescence properties, charge compensation mechanism and crystal field effect were investigated in detail. A most remarkable tuning effect can be achieved when the Bi 3+ concentration is 5% in CaAl 12 O 19 :Bi 3+ , 0.05% Mn 4+ and the electric multipolar interaction is inferred to be the main mechanism for concentration quenching effect. It is also found that, as charge compensators rather than sensitizers, Bi 3+ ions can effectively tailor the emissions in a wide range through partial reducing Mn 4+ to Mn 2+ . The charge compensation physics presumably involves the shift of Fermi energy level ( E F ) and variations of valence states of manganese ions after Bi 3+ introduction. Moreover, the authors calculated the splitting energy (Δ) and Racah parameters ( B and C ) for Mn 4+ in octahedral sites and Mn 2+ in tetrahedral sites by combining excitation spectra with Tanabe-Sugano diagram. The experimental results will be of certain helpfulness in developing phosphors used in white LED.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yuan Zhong,Nan Zhou,Mao Xia,Yue Zhou,Hongxi Chen,Zhi Zhou
Indoor cultivation has attracted more and more concerns in the last few years. Searching for ideal red-emitting phosphors for this application has been a great challenge. In this paper, a novel red-emitting phosphor SrAl 3 BO 7 :Mn 4+ (SABO:Mn 4+ ) had been synthesized through a modified hydrothermal reaction method for the first time. Three kinds of effect parameters, including hydrothermal reacting time, sintering temperature and Mn 4+ doping concentration, were comprehensively considered to optimize the phase purity and luminescent properties of the SABO:Mn 4+ phosphor. Besides, the luminescent properties of SABO:Mn 4+ was systematically investigated through UV–vis absorption spectra , PLE and PL spectra, CIE chromaticity coordinate and decay times. The excitation band of this phosphor locates in the wavelength range of 250–550 nm, resulting from Mn 4+ → O 2− charge transfer and electron transitions from 4 A 2 – 4 T 1 , 2 T 2 and 4 T 2 energy levels. Meanwhile, a sharp emission band is detected from 600 to 700 nm with two emission peaks located at 648 and 662 nm, which is assigned to 2 E → 4 A 2 characteristic transition of Mn 4+ . In addition, Mg 2+ /Zn 2+ /Ca 2+ are co-doped as charge compensators to improve the luminescent properties of SABO:0.03Mn 4+ . The impacts of doping concentration of Mg 2+ /Zn 2+ /Ca 2+ on the photoluminescent intensity, QE and thermal stability of SABO:0.03Mn 4+ phosphor is investigated carefully. The corresponding mechanism is discussed via decay times, EPR spectra and configurational coordinated diagram. More importantly, the EL spectrum of as-fabricated pc-LED device matches well with the absorption of plant pigments, demonstrating this novel phosphor can regard as a promising red-emitting luminescent material to meet the light requirement in plant growth LED lighting.
研究领域:
材料科学
·
光学工程
·
植物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Simin Gu,Mao Xia,Cheng Zhou,Zihui Kong,Maxim S. Molokeev,Li Liu,Wai-Yeung Wong,Zhi Zhou
The discovery of novel Mn 4+ -doped oxide red phosphor with suitable spectrum for plant growth is a hot issue in the recent years due to the characteristic red photoluminescence of 2 E g → 4 A 2 transition in Mn 4+ ions. Generally, the emission position of Mn 4+ is hard to tune because of specific crystal field in most phosphors. In this work, tunable luminescence property with obvious red shift in the spectra is observed in the Mn 4+ -doped SrMgAl 10-y Ga y O 17 red phosphor via simple substitution of Ga 3+ for Al 3+ , and crystal field theory and nephelauxetic effect are employed to explain this phenomenon. Meanwhile, the Ga 3+ dopant changes the shape of the spectra because Ga 3+ dopant guides the replacement site of Mn 4+ and changes the luminescence center. Improved emission intensity is obtained because appropriate Ga 3+ doping leads to larger band gap and reduces non-radiative transitions. Phosphor-converted LED (pc-LED) devices fabricated with blue chip (470 nm) and the as-obtained SrMgAl 10-y Ga y O 17 :1.0%Mn 4+ phosphors emit bright blue and red light, which fit the absorption regions of plant pigments well, thus SrMgAl 10-y Ga y O 17 :Mn 4+ phosphor can be a candidate for plant growth LED light.
研究领域:
材料科学
·
光电子学
·
固体化学
·
农业光生物学
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发光材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 45
·17180-17191
·
IF 4.569
Liang Li,Qianwen Cao,Jing Xie,Wenming Wang,Yubei Wang,Hongmei Chen,Zhongyuan Li,Yan Pan,Xiantao Wei,Yong Li
Altering the local symmetry of an activator by lattice tuning is considered an effective strategy to optimize the luminescence performance of phosphors. Herein, the novel Mn4+-activated double perovskite phosphor La1.67MgTaO6 (LMTO) with A-site defects was successfully prepared. Benefiting from the random occupation of the nearest A-site by cations and vacancies, the distorted [MnO6] octahedra lack the inversion center. The LMTO:0.4 mol%Mn4+ phosphor has a significant zero-phonon line intensity with a high internal quantum efficiency (IQE) value of 62.97% after the Laporte selection rule is broken. Furthermore, local lattice tuning was performed by increasing the randomness of the A-site and the distortion index of the [MnO6] octahedron by co-doping with Ca2+ or Sr2+ ions. Importantly, the IQE value of the samples was enhanced from 62.97% to 72.65% and the activation energy increased from 0.497 eV to 0.548 eV, which can be well applied in the fields of plant cultivation and warm white light-emitting diodes. These studies provide valid fundamental insights for the selection of excellent luminescent matrices to obtain efficient Mn4+-activated phosphors via local lattice tuning.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 12
·20173-20182
·
IF 3.83
Shujie Gai,Haifeng Zhu,Peixin Gao,Cheng Zhou,Zihui Kong,Maxim S. Molokeev,Zhiyong Qi,Zhi Zhou,Mao Xia
Currently, phosphor-converted LEDs (pc-LEDs) are revolutionizing the industry of plant growth lighting. To meet the requirements of this technology, phosphors with tunable photoluminescence , high thermal stability and luminous intensity are required. Herein, we found that the simple substitution of yttrium for lanthanum in La 2 MgTiO 6 :Mn 4+ (LMT:Mn 4+ ) system could satisfy above three criteria simultaneously. The photoluminescence properties can be regulated by continuously controlling the chemical composition of La 2-x Y x MgTiO 6 :Mn 4+ solid solution . The La sites are occupied by Y ions , causing a significant blue shift in the emission spectra which owing to the change of local crystal field strengthen. Meanwhile, the thermal stability and decay lifetimes are also varied due to the variation of local structure and band gap energy. The thermal stability of the material reaches 83.5% at 150 °C, which is better than the reported La 2 MgTiO 6 :Mn 4+ and Y 2 MgTiO 6 :Mn 4+ phosphors. The electronic luminescence (EL) of pc-LED devices using La 2-x Y x MgTiO 6 :Mn 4+ red phosphor is evaluated, which matching the absorption regions of plant pigments well, reflecting the superiority of the studied phosphors in plant growth lighting areas.
研究领域:
材料科学
·
光电子学
·
无机化学
·
农业工程
·
固体物理
·
发光材料
·
植物生理学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 30
·12465-12476
·
IF 3.5
Fei Wang,Huihui Chen,Shiwei Zhang,Huiqing Jin
Red fluorescent materials have important application value in the background light and LED lighting fields of displays. In this work, a novel type of rare earth free deep-red phosphor LiMg4SbO7:Mn4+ was prepared successfully, and its crystal structure, microstructure, fluorescence spectrum, quantum yield, thermal stability, fluorescence lifetime, color coordinates and color purity were studied in detail. The excitation spectra of LiMg4SbO7:Mn4+ phosphors are located at 200–600 nm, which can be matched with ultraviolet, near-ultraviolet, and blue-light chips. The exciting result is that the LiMg4SbO7:0.002Mn4+ phosphor exhibits astonishing quantum efficiency, thermal stability and color purity. Finally, the developed LiMg4SbO7:Mn4+ and the yellow phosphor Y3Al5O12:Ce3+ (YAG:Ce3+) were mixed and coated on a blue light chip (460 nm) to produce a w-LED, which exhibited warm white luminescence with color coordinates of (0.3575, 0.3809), correlated colour temperature (CCT) of 4687 K, and color rendering index (CRI) of 83.6. It is reasonable to consider that LiMg4SbO7:Mn4+ phosphors with excellent photoluminescence performance have great application value in LED lighting fields.
研究领域:
材料科学
·
发光材料
·
半导体照明
·
光学工程
·
固态照明
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bin Li,Yingfang Li,Bin Cao,Chong Yang,Rongbo Ma,Chaoyong Deng,Weichao Huang
The high-temperature solid-state method synthesized novel double perovskite CaSrLaSbO 6 : Bi 3+ , Mn 4+ phosphors. Its crystal structure, luminescence properties, crystal field strength, energy transfer process, and temperature-sensitive properties were comprehensively investigated. The band gap values of CaSrLaSbO 6 were calculated using density functional theory. In the CaSrLaSbO 6 host, Bi 3+ exhibits multiple emission properties in the violet, blue, and NIR regions due to the 3 P 1 → 1 S 0 transition, while the red emission is due to the 2 E g → 4 A 2g transition of Mn 4+ . Light-converting films fabricated using CaSrLaSbO 6 :Bi 3+ , Mn 4+ under 302 nm UV excitation with multiple emissions showed significant plant growth promotion. In addition, the optical temperature-dependent response of CaSrLaSbO 6 : Bi 3+ , Mn 4+ was analyzed using the luminescence intensity ratio technique, and the relative sensitivity of the best samples reached 2.1 % K −1 . The above results indicate that CaSrLaSbO 6 : Bi 3+ , Mn 4+ provides almost all the light sources necessary for plant growth and can be applied in the field of optical temperature sensors, which shows that this multifunctional phosphor has great potential for application.
研究领域:
材料科学
·
植物学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junze Tong,Long Li,Haiqing Su,Feng Hong,Edwin Yue Bun Pun,Hai Lin
Red-emitting Mn 4+ -doped fluoride phosphors are promising fluorescent material for use in high-performance warm white light emitting diodes (WLEDs). However, low stability and non-green synthesis method limit the development and commercialization of such phosphor. Herein, a series of novel (Li/Na/Cs) 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphors with optimized fluorescence properties induced by alkaline metal ions replacement are successfully synthesized via a green and eco-friendly approach. Under the irradiation of 460 nm blue light, Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ red phosphor with narrow band emission peak has the best optical performance. The optimal doping concentration of Mn 4+ in Cs 0.4 Ba 0.8 SiF 6 host and the reason for concentration quenching are systematically analyzed. Furthermore, the moisture resistance and thermal stability of this phosphor are discussed. After being soaked in deionized water for 90 min, the PL intensity of Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphor can maintain at 40% of that in air, which is 4 times higher than commercial K 2 SiF 6 :Mn 4+ . At the operating temperature of LED (423 K), Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ red phosphor can exhibit stable light output intensity and color. A warm WLED with low correlated color temperature of 4336 K, high color rendering index of 88.4 and high lumen efficiency of 105.96 lm/W is fabricated via using Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphor as a component of red-light, and the warm WLED can maintain stable output even at high driving currents. Overall, the alkali metal ion replacement and green synthesis strategies have opened up a new perspective for the synthesis of efficient Mn 4+ -doped fluoride phosphors, which has dual benefits for optimizing the performance of WLED and environmental protection.
研究领域:
材料科学
·
光学工程
·
环境科学
✓ 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）