OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiajie Pan,Youjie Hua,Zhanhao Fan,Hongping Ma
Far-red light plays a crucial role in the field of plant lighting. Herein, a novel far-red phosphor BaAl 2 Si 3 O 4 N 4 : Sm 2+ , which can be effectively excited by blue light, was successfully prepared by high-temperature solid-state reaction. The PL spectrum show a broadband emission range from 600 nm to 950 nm (FWHM = 120 nm), which is well matched with the absorption of P FR in plant. In BaAl 2 Si 3 O 4 N 4 : Sm 2+ , the Ba 2+ are coordinated with three N and six O atoms. When the rare earth ion of Sm 2+ was doped into the host lattice , Ba 2+ was partially replaced by Sm 2+ . The low temperature PL spectra at 8–80 K were studied in detail. It was found that the PL spectra at low temperature were composed of some sharp lines and broadband superposition, which corresponding to the 5 D 0 - 7 F J (J = 0–4) energy level transition of Sm 2+ . It is shown that the broadband emission of the phosphor was caused by the broadening of the 4f 5 5 d 1 energy level due to the strong crystal field effect. The thermal stability analysis showed that the luminescence intensity of BaAl 2 Si 3 O 4 N 4 : Sm 2+ at 150 °C still maintains 62.7 % of that at room temperature , showing excellent thermal stability. All results indicate that BaAl 2 Si 3 O 4 N 4 : Sm 2+ phosphor has important potential applications in the field of plant lighting.
研究领域:
材料科学
·
光电子学
·
农业光学
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无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Renping Cao,Xiaoshan Hu,Jingheng Nie,Bang Lan,JinRong Wang,Ting Chen,Yuyu Chen,Jing Wang
With the need of food safety and high yield, new luminescent materials with promoting plant photosynthesis have attracted more and more attention. In this research, we synthesize the far-red-emitting LaBaMg(Ti 0.5 W 0.5 )O 6 :Mn 4+ phosphor in air. We investigate the crystal structure and phase, particle morphology and size, and the luminescence properties. The samples show a broad excitation spectrum under monitored 704 nm due to the Mn 4+ - O 2− charge transfer (CT) and the transitions 4 A 2g → 4 T 1g , 2 T 2g , and 4 T 2g of Mn 4+ in the range of 300 – 600 nm. The far-red emission of sample is observed with the emission spectrum (650 – 790 nm) is attributed to the E g → 4 A 2g transitions. The chromaticity coordinates are (0.7329, 0.2671). The crystal field strength ( D q ), the Racah parameters ( B and C ), and D q / B values are ∼ 1972 cm −1 , 596 cm −1 , 3219 cm −1 , and 3.31, respectively. 0.2 mol% is the optimal Mn 4+ concentration. Emission spectra under excitation wavelength from 320 nm to 560 nm and time-resolved emission spectra confirm the only luminous center (Mn 4+ ) in LaBaMg(Ti 0.5 W 0.5 )O 6 :Mn 4+ . Lifetime reduces with added Mn 4+ concentration. The temperature-dependence emission spectra confirm that sample has a good thermo-stability. The thermal quenching phenomenon and luminous mechanism are analyzed. The luminescence properties of sample infer its application prospect in plant growth light-emitting diode (LED).
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 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 Materials Chemistry C
·
2024
·
IF 5.7
Chenyang Li,Yimin Zhou,Fei Tang,Yizhuo Chen,Kangzhen Tian,Bo Zhao,Shijie Xu
Far-red (FR) emission (>700 nm) with high efficiency and excellent thermal stability is in great demand for solid-state lighting applications in health illumination. However, currently used FR materials often face challenges such as complex synthesis, low efficiency, and thermal instability. In this study, we present a highly efficient and thermally stable far-red phosphor, Mn4+-activated La1−xCaxAlO3−yFy, with a dominant emission wavelength of 731 nm. Based on this, an ultrathin phosphor–glass composite (PGC), with a FR luminescence quantum yield of 68.2%, is prepared using a tape-casting process combined with a low-temperature cofiring technique. The impact of ionic substitution on the crystal structure and luminescence properties is examined to establish the optimal doping conditions. Interestingly, we observed that the prepared PGC exhibits temperature-dependent luminescence distinct from that of FR phosphor. The luminescence lifetime for the PGC is measured to be nearly 3.576 ms, representing a 28.4% decrease compared to that of the pure phosphor. Ultimately, light-emitting diodes (LEDs) are fabricated by combining the PGC with a violet chip, and their electroluminescence (EL) properties are strongly dependent on the configuration of the PGC composite. This research offers a straightforward and versatile method for producing ultrathin far-red PGCs that hold promise for diverse photonic applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Wei Li,Nan Ma,Qi Sun,Shaoying Wang,Zongjie Zhang,Balaji Devakumar,Xiaoyong Huang
Novel efficient Ba 2 YTaO 6 :Mn 4+ (BYT:Mn 4+ ) far-red emitting double-perovskite phosphors for plant cultivation LEDs were reported in this article. These phosphors were successfully synthesized via a traditional high-temperature solid-state reaction method, and their crystal structure, luminescence properties, fluorescence decay lifetimes, Commission Internationale de l'Eclairage (CIE) chromaticity coordinates, internal quantum efficiency, and thermal stability have been systematically investigated. XRD Rietveld refinement demonstrated that the BYT:Mn 4+ compound crystallized into cubic crystal system with Fm 3 ‾ m space group, and the lattice parameter were a = b = c = 8.445 (7) Å, α = β = γ = 90°, and V = 602.231 (10) Å 3 . Interestingly, the obtained samples showed an intense far-red emission band centered at 690 nm under excitation of 360 nm, which matched well with the absorption band of phytochrome P FR. In BYT:Mn 4+ phosphors, the Mn 4+ ions occupied the TaO 6 octahedron by replacing the Ta 5+ site, and the optimal doping concentration of Mn 4+ ions was determined to be 0.4 mol%. The CIE chromaticity coordinates and internal quantum efficiency of BYT:0.4%Mn 4+ phosphors were (0.7283, 0.2717) and 41.5%, respectively. In addition, when the temperature reached at 423 K, the emission intensity of BYT:0.4%Mn 4+ phosphors remained 37% of that at 303 K. Therefore, all of these investigations demonstrated that BYT:Mn 4+ phosphors could be used as potential far-red emitting phosphors for plants cultivation LEDs.
研究领域:
材料科学
·
植物生物学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·1300-1317
·
IF 3.784
Yan Xie,Xue Geng,Yuan Wang,Jiang Guo,Yuhui Lu,Qiuyi Lv,Zhijiang Ma,Dan zhang,Jin Zhao,Bin Deng,Ruijin Yu
High-efficiency and far-red light phosphors based on Mn 4+ -doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn 4+ -doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn 4+ -activated oxide phosphors. Herein, a series of Sr 2 InSbO 6 :Mn 4+ , M (SISO:Mn 4+ , M) (M = Li + , Na + , and K + ) far-red-emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn 4+ samples showed a far-red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far-red-phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn 4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li + , Na + , and K + ) could improve the luminescent intensity of SISO:Mn 4+ . The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn 4+ and SISO:0.006Mn 4+ , 0.006Li + phosphors are 22.67% and 60.56%, respectively. SISO:Mn 4+ , Li + phosphors-based plant growth light-emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yingfang Li,Hai Wu,Bin Cao,Tingting Zhang,Yixi Lu,Chaoyong Deng,Weichao Huang
Developing far-red phosphors with high thermal stability and spectral matching is of great significance for plant growth light-emitting diodes (LEDs). In this paper, NaAl 5 O 8 : Cr 3+ far-red emitting phosphors were synthesized by the high-temperature solid-phase reaction method. The crystal field parameters, luminescence properties, and thermal quenching behavior were investigated in detail. The NaAl 5 O 8 : Cr 3+ phosphor showed a far-red emission band centered at 707 nm, which is attributed to the 2 E→ 4 A 2 transition of Cr 3+ ions. Notably, NaAl 5 O 8 : Cr 3+ phosphor exhibited outstanding thermal stability, with an integrated emission intensity reaching 109 % at 423 K compared to that at room temperature (298 K), corresponding to a 9 % increase in emission intensity at high temperature. The full width at half maximum in the temperature-dependent emission spectra increased with increasing temperature. Eventually, a prototype LED device was fabricated by integrating the NaAl 5 O 8 : Cr 3+ phosphors and a commercial 410 nm LED chip. The obtained electroluminescence spectrum of the LED was well matched with the absorption band of the photosensitive pigment P FR , and the fabricated LED performed well in plant cultivation applications. In the sunflower plant growth experiment, the average growth rate under pc-LED irradiation was 1.8 times that under sunlight. These results indicate that NaAl 5 O 8 : Cr 3+ phosphor has great potential for application in plant growth LEDs.
研究领域:
材料科学
·
光电子学
·
农业光学
·
无机化学
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2021
·
IF 4.291
Wei Li,Liangling Sun,Balaji Devakumar,Nan Ma,Zongjie Zhang,Xiaoyong Huang
In this work, we demonstrated novel Mn 4+ -activated double-perovskite SrLaZnSbO 6 (SLZS) far-red-emitting phosphors for plant cultivation LED lighting. These SLZS:Mn 4+ far-red-emitting phosphors doped with various Mn 4+ concentrations were successfully prepared by using a traditional high-temperature solid-state reaction route. The phase purity, crystal structure, photoluminescence properties, decay lifetimes, CIE chromaticity coordinates and temperature-dependent spectra of as-prepared samples were systematically studied. The SLZS:Mn 4+ phosphors showed an intense far-red emission band in the 650−800 nm spectral region with a maximum at 706 nm under 364 nm excitation, which was due to the 2 E g → 4 A 2g transition of Mn 4+ ions. The optimal doping concentration of Mn 4+ ions in SLZS:Mn 4+ phosphors was found to be 0.5 mol%. And the CIE chromaticity coordinates of SLZS:0.5 %Mn 4+ phosphors were calculated to be (0.7276, 0.2724), which were located in the far-red region. The emission spectrum of SLZS:Mn 4+ phosphors could match well with the absorption band of phytochrome P FR . All of these results demonstrate that SLZS:Mn 4+ phosphors have a huge potential application in indoor plant cultivation.
研究领域:
材料科学
·
光学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dong Yi,Jiawei Fu,Fenzhong Long,Jin Han,Fangui Meng,Xinmin Zhang
To improve the quality of white LED and develop plant growth lighting, considerable efforts have been devoted to investigating red phosphor. Eu 3+ -activated phosphors are well-known red-emitting components due to their 5 D 0 - 7 F 1,2 transitions in various applications. It is also found that its 5 D 0 - 7 F 4 transition in the range of far-red wavelengths has potential applications in the fields of daily and agricultural lighting. In this study, two kinds of Eu 3+ -doped layered perovskite La 2 Ti 2 O 7 and A 2 La 2 Ti 3 O 10 (A = Li, Na, K) phosphors were synthesized by the solid-state method. The crystal structure, absorption, excitation, and emission spectra of all the samples were investigated in detail. Dissimilar luminescent behaviors of the studied samples were observed. Due to the different crystal structure and chemical composition of the host matrix, each compound exhibits a different emission spectrum. Specifically, Eu 3+ occupies a lower symmetric La 3+ site in A 2 La 2 Ti 3 O 10 (A = Li, Na, K) phosphors, resulting in an intense 5 D 0 - 7 F 4 far-red emission, while in La 2 Ti 2 O 7 :Eu 3+ , Eu 3+ gives a weak 5 D 0 - 7 F 4 emission. To the best of our knowledge, this is the first report that Eu 3+ exhibits a strong 5 D 0 - 7 F 4 far-red emission in the titanate host lattices with perovskite structure. Besides, A 2 La 2 Ti 3 O 10 :Eu 3+ (A = Li, Na, K) phosphors achieve higher photoluminescence efficiency than La 2 Ti 2 O 7 :Eu 3+ . Among them, the internal quantum efficiency of the optimized Li 2 La 2 Ti 3 O 10 :1.2Eu 3+ is about 84.7 %, and it has a better thermal stability (80 % at 125 °C). Furthermore, good photoelectric performances of red/white-LEDs fabricated by utilizing the representative Li 2 La 2 Ti 3 O 10 :1.2Eu 3+ as red/far-red components indicate that it has potential applications in indoor/outdoor lighting and plant growth lighting. This study provides a feasible way for developing efficient Eu 3+ -activated far-red optical materials.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Jiang Zhehui,Wang Tianhao,Zhang Kaixue,Zhang Meiqi,Ma Ling,Ren Weichao,Bao Yihong,Ma Wei
Light quality consists of a spectrum of different bands, which not only affects plant, development, and primary metabolism but also affects the secondary metabolism of plants. It is an important factor affecting the content of active components of medicinal plants. The A. paniculata seedlings planted in the laboratory, as materials, were tested with red light, far red light, blue light, and ultraviolet light separately. The study assays the content of six main chemical components separately by LC-MS, observes the changes in the content, and analyzes the relationship between the light quality and the active ingredient of A. paniculata. Using the ointment yield and pH value, the fingerprint analysis method of A. paniculata standard decoction was established, and we discussed the selection of index components of A. paniculata standard decoction. It was suggested to select andrographolide as the index component. It will provide a theoretical basis for the large area cultivation of A. paniculata and optimize the quality of medicinal materials to ensure the quality of standard decoction.
研究领域:
生药学
·
植物生理学
·
药物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chunli Peng,Baoling Tang,Mingkai Wei,Xuejie Zhang,Maxim S. Molokeev,Haoran Zhang,Bingfu Lei
Cr 3+ -doped phosphors still suffer from limitations, such as low quantum efficiency, poor thermal stability, and spectral peak mismatch, restricting their application in pc-LEDs for indoor agriculture. In this study, cation Sc substitution strategy was applied in Y 3 Ga 5 O 12 . Given that the emission location, an efficient far-red (FR) phosphor Y 3 ScGa 4 O 12 :Cr 3+ (YSGO:Cr 3+ ) with high matching to phytochrome was constructed, under 442 nm excitation, realizing FR emission (728 nm) with FWHM 99 nm. The optimized phosphor demonstrates exceptionally high internal quantum efficiency of 95.4 % and excellent thermal quenching property (91.6 %@423 K). Furthermore, a fabricated phosphor-converted light-emitting diode (pc-LED), combining YSGO:0.07 Cr 3+ with a 450 nm chip, delivers FR output power of 36.74 mW with a photoelectric conversion efficiency (PCE) of 12.8 % at 100 mA, demonstrating ultra-low quenching rate (<5 % intensity loss after 3 months operation). A supplemental lighting model for lettuce growth was constructed, which significantly improves in physiological parameters, confirming the great potential of this phosphor for plant lighting applications.
✓ 已验证
产品关联
DOI
高影响因子
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