Materials Today Chemistry
·
2021
·
IF 8.301
Nan Ma,Wei Li,Balaji Devakumar,Zongjie Zhang,Xiaoyong Huang
The development of high-brightness far-red-emitting phosphors with emission wavelength within 650–750 nm is of great significance for indoor plant cultivation light-emitting diode (LED) lighting. Herein, we demonstrate a novel efficient far-red-emitting phosphors CaMg 2 La 2 W 2 O 12 :Mn 4+ (abbreviated as CMLW:Mn 4+ ) toward application in plant cultivation LEDs. Interestingly, the CMLW:Mn 4+ phosphors show a broad excitation band in the 250–600 nm spectral range with two peaks at 352 and 479 nm, indicating they could be efficiently excited by near-ultraviolet and blue light. Under 352 nm excitation, the CMLW:Mn 4+ phosphors exhibit an intense far-red emission band in the wavelength range of 650–800 nm peaking at 708 nm, corresponding to the 2 E g → 4 A 2g transition of Mn 4+ ions. Mn 4+ doping concentration-dependent luminescence properties are studied in detail, and the concentration quenching mechanism is also investigated. Particularly, the internal quantum efficiency of CMLW:Mn 4+ phosphors reaches as high as 44%, and their PL spectra match well with the absorption spectrum of phytochrome P FR (P FR stands for far-red-absorbing form of phytochrome). Furthermore, a prototype LED device is fabricated by coating the as-prepared CMLW:0.8%Mn 4+ phosphors on a 460 nm blue LED chip, which produces bright far-red emissions upon 20–300 mA driving currents. This work reveals that the newly discovered far-red-emitting CMLW:Mn 4+ phosphors hold great potential for application in indoor plant cultivation.
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
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Kang Cheng,Xinyue Liu,Rongbo Ma,Bin Li,Chong Yang,Xinyong Gong,Weichao Huang
Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors were successfully synthesized by the high-temperature solid-state reaction method. Cr 3+ , Mn 4+ co-doped Li 2 MgTiO 4 phosphors have two emission peaks at 674 nm and 719 nm, corresponding to 2 E→ 4 A 2 transitions of Mn 4+ and 2 E→ 4 A 2 transitions of Cr 3+ , respectively. The two emission peaks are matched with the absorption of P R and P FR , and the intensity ratio of the two emission peaks is adjusted by changing the doping concentration of Mn 4+ , indicating that the phosphors have potential applications in plant cultivation. In addition, it can be observed that the emission peak corresponding to Mn 4+ can decrease sharply with the increase of excitation wavelength, while the emission peak corresponding to Cr 3+ can change little, which indicates that the phosphors can be used for wavelength detection. The security ink prepared by Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors shows that it can be applied in anti-counterfeiting labels. These results suggest that Li 2 MgTiO 4 :Cr 3+ , Mn 4+ have the great potentiality to be used for plant cultivation, wavelength detection and anti-counterfeiting.
研究领域:
材料科学
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光学工程
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Jinquan Chen,Conghua Yang,Yibo Chen,Jin He,Zhao-Qing Liu,Jing Wang,Jilin Zhang
Modulating the local environment around the emitting ions with component screening to increase the quantum yield and thermal stability is an effective and promising strategy for the design of high-performance fluorescence materials. In this work, smaller Lu3+ was introduced into the La3+ site in a Mn4+-activated LaAlO3 phosphor with the expectation of improving the luminescence properties via lattice contraction induced by cation substitution. Finally, a La1–xLuxAlO3:Mn4+ (x = 0–0.04) perovskite phosphor with a high quantum yield of 86.0% and satisfactory thermal stability was achieved, and the emission peak at 729 nm well matches with the strongest absorption peak of the Phytochrome PFR. The favorable performances could be attributed to the suppressed cell volume and superior lattice rigidity after the substitution of Lu3+. This work not only obtains a highly efficient La1–xLuxAlO3:Mn4+ (x = 0.02) phosphor, which holds great potential for application in plant-cultivation light-emitting diodes, but also provides an applicable strategy for further investigation of far-red-emitting phosphors.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zaifa Yang,Wenyue Zhang,Zhide Wang,Yu Zheng,Yi Su,Haowen Xu,Zhengxin Guo,Ruoxuan Wang,Shuyu Yang
In recent years, near-infrared phosphor-converted light-emitting diodes (NIR pc⁃LEDs) have attracted a lot of attention in the fields of night vision, sensing and nondestructive testing. However, realizing multifunctional applications with the same material is still a great challenge. In this study, we prepared an efficient and thermally stable excellent Cr 3+ -activated Cd 3 Al 2 Ge 3 O 12 (CAG) garnet NIR phosphor. Under the excitation of 436 nm blue light, its NIR emission covers the range of 600–900 nm, the highest peak is at 714 nm and an internal quantum efficiency is 80.4 %. Meanwhile, the phosphor exhibits excellent thermal stability, and the integrated intensity of its NIR emission spectrum at 423 K temperature is 89.4 % of room temperature (89.4 %@423 K), which shows remarkable high thermal stability characteristics. The temperature-dependent properties of the fluorescence lifetime of Cr 3+ and the fluorescence intensity ratio of the thermally coupled energy levels in CAG:0.005Cr 3+ were utilized for thermometry studies from 100 K to 275 K. The relative thermometric sensitivities of the two methods reached a maximum value of 1.4 % K −1 at 200 K and a maximum value of 1.2 % K −1 at 100 K. Finally, the applications of the CAG:0.005Cr 3+ phosphor in plant illumination, night-vision monitoring and non-destructive testing of biological tissues were discussed by using the synthesized NIR pc⁃LEDs, which proves that the CAG:0.005Cr 3+ phosphor has a broad application prospect.
研究领域:
材料科学
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光学工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·140
·
IF 3.426
Feng Chen,Huihui Chai,Zhaoxi Song,Ling Yu,Can Fang
In this work, a citric acid monohydrate (CAM)-templated polydimethylsiloxane (PDMS) sponge was proposed to mimic heterogeneous pore structures in the soil for plant cultivation. The porosity of the PDMS sponges was tuned by adjusting the CAM template. The water intake capability of the sponge was improved by (3-Aminopropyl) triethoxysilane (APTES) functionalization. The pore size and pore distribution were characterized by SEM and micro-computed tomography (micro-CT). The effect of pore structures onOryzasativa(O. sativa) growth was investigated. Also, a 3D multi-layer PDMS sponge assembling was proposed to mimic the heterogeneous pore distribution at the different soil depth. The different growth rates ofO. sativaandNicotiana tabacum L.(N. tabacum) seeds on porous PDMS sponge indicated the impact of physical obstacles (pores) and chemical (water content) conditions on plant development. It is anticipated that this PDMS sponge could serve as a 3D matrix to mimic soil and provide a new idea for plant cultivation.Keywords:PDMS sponge;porous 3D matrix;artificial soil;seed germination;plant cultivation
研究领域:
植物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Sijin Zhang,Shujie Gai,Xiaojuan Zhang,Mao Xia,Zhi Zhou,Xiao Cheng,Maohai Yao,Maxim S. Molokeev,Qiuju Feng
Red and far-red emitting phosphors have been widely used in phosphor-converted light emitting diode (pc-LED) devices to provide lighting for indoor plant growth, thus achieving desired product qualities. Among the many ways to optimize phosphors’ optical performance, cationic substitution is one of the most effective methods. In this study, red phosphors (Li 2 MgTi 1- x - y O 4 : x Mn 4+ , y Ge 4+ ) were synthesized by high temperature solid state method and the optical performance of phosphors were improved with increasing Ge 4+ constituents. In particular, luminescence intensity of Li 2 MgTiO 4 : 0.002Mn 4+ , 0.1Ge 4+ increased by 152% under 468 nm excitation, and the thermostability of emission intensity increases from 22% ( y = 0) to 43% ( y = 0.1), which is about twice as much. Finally, pc-LED device was fabricated via the red phosphor Li 2 MgTiO 4 : 0.002Mn 4+ ,0.1Ge 4+ coated on a 470 nm ultraviolet chip. By changing the proportion of the phosphor, the electroluminescence spectra of pc-LED device could match well with the absorption regions of plant pigments. Therefore, Li 2 MgTiO 4 : 0.002Mn 4+ , 0.1Ge 4+ phosphor has potential application in plant lighting. Furthermore, this work can offer some helpful references for improving luminescent efficiency by simply modulating the chemical composition.
研究领域:
材料科学
·
光学
·
农业工程
✓ 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
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
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
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·794
·
IF 2.7
Wang Xuekai,Cao Yongze,Yan Xianglan,Li Lei,Zhang Xizhen,Zhang Jinsu,Chen Baojiu
17K 2 O–33SnO–50P 2 O 5 –xMnCl 2 glasses with x = 0, 0.6, 1.2, 1.8, 2.4, 3.0 were made using melt quenching at 500 °C low temperature. The structure and photoluminescence properties of these glasses were investigated, and the water resistance was evaluated. The experimental results show that the effectively energy transfer from Sn 2+ to Mn 2+ occurs, and when Mn 2+ doping at 3.0, the energy transfer efficiency reaches 74%. Under 340 nm excitation, the emission wavelength is in the range of 500–800 nm, covering the absorption wavelength of chlorophyll P R and P FR , which indicates that the low temperature glasses can be used for plant cultivation. This glass material was immersed in water for 24 h, and the luminescence intensity decreases 10%. This indicates that the glass material has certain waterproof property.
研究领域:
材料科学
·
农业光学
·
无机非金属材料
·
光生物学
·
功能玻璃
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Enjie He,Xiangxiao Chen,Yaqi Wu,Yinkang Cui,Tao Wang,Fangfang Li,Qingyan Han,Xuzhong Zuo,Nian Liu
This study presents the synthesis and characterization of efficient deep-red-emitting CaMg 2 La 2 W 2 O 12 :Mn 4+ , Nd 3+ (CMLW:Mn 4+ , Nd 3+ ) phosphors for application in light-emitting diodes (LEDs) designed for indoor plant cultivation. The phosphors were prepared via a high-temperature solid-state reaction and exhibited an orthorhombic structure with optimal luminescence properties at Mn 4+ (0.90 %) and Nd 3+ (0.60 %) doping concentrations. The enhanced performance of CMLW:0.90 %Mn 4+ , 0.60 %Nd 3+ over its Nd 3+ -free counterpart originates from three synergistic mechanisms: (1) Nd 3+ substitution for larger La 3+ induces lattice shrinkage, shortening the Mn 4+ -O 2- bond length and enhancing the crystal-field strength, thereby increasing the radiative transition probability of 2 E g → 4 A 2g emission at 708 nm; (2) Nd 3+ co-doping suppresses concentration quenching by increasing the critical distance between Mn 4+ ions, as evidenced by prolonged lifetime and higher optimal Mn 4+ concentration; (3) The optimal Nd 3+ concentration improves lattice rigidity while avoiding defect formation observed at higher doping levels. The resulting phosphor demonstrates intense deep-red emission matching the phytochrome P FR absorption band, excellent thermal stability (73.66 % intensity at 453 K), and a high internal quantum efficiency (IQE) of 86.80 %. A prototype LED device exhibits stable deep-red emission and a luminous efficacy of 0.10 lm/W under 365 nm excitation. These results position CMLW:Mn 4+ , Nd 3+ phosphor as a promising candidate for indoor plant cultivation LEDs.
研究领域:
材料科学
·
光学工程
·
农业光电子学
·
固体化学
·
光生物学
✓ 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）