JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2022
·
IF 6.814
Zhi Zhou,Shuqing Feng,Shujie Gai,Peixin Gao,Chen Xu,Mao Xia,Wenbang Tang,Xuedan Lu
Industrial Seedling Raising (ISR) is increasingly becoming an important part of Modern Agriculture because of its efficient utilization of land, water, and fertilizer as well as its advantages of being not easily affected by the weather. However, the high cost and high energy consumption of light sources for plant growth is limiting the popularization of ISR technology. Phosphor-converted light-emitting diodes (pc-LEDs) make use of relatively affordable red phosphor and blue light chips, providing an adjustable spectrum to optimize plant growth. To identify the energy-saving light quality of pc-LEDs, we investigated the effects of a variety of light qualities on the growth of tobacco seedlings. Y 3 Al 5 O 12 :Ce 3+ , CaAlSiN 3 :Eu 2+ , KAl 11 O 17 :Eu 2+ phosphors were combined with the blue light chip according to different proportions to produce the following light sources: CK (white light), T1 (blue light), T2 (red light), T3 (red: blue light ratio = 1:4), T4 (red: blue light ratio = 4:1). The tobacco variety Xiangyan7 grown continuously under T1, T2, T3, and T4 significantly increased the leaf area, stem length, biomass, root area and main root length compared with those grown under white light. Among the five kinds of light qualities tested, T4 treatment exerted the best effect on leaf development and biomass increase, while T2 exerted the best effect on stem elongation . The cytological analysis demonstrated that the promotion of the cell size and cell number of leaf epidermal cells by T1-T4 might contribute to the leaf expansion. Further analysis at the molecular level suggested that the light quality affected the RNA levels of the genes involved in cell division and expansion. When tobacco seedlings reached the same biomass, T1-T4 light sources saved 71%, 86%, 80% and 89% of electric energy respectively compared with white light. Therefore, the application of specific pc-LEDs not only reduces the cost of light source production, but also saves energy consumption, offering great potential for ISR technology to cut costs and increase efficiency.
研究领域:
农业
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植物生理学
·
照明技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mingjun Zhao,Chongyun Shao,Weichang Li,Danping Chen,Wei Chen
A novel strategy for effectively enhancing the near-infrared (NIR) broadband luminescence of Fe 3+ by modifying the symmetry of the Fe 3+ coordination field is developed and evaluated. The borate glass doped with F (fluorine) or S (sulfur) prepared in a reducing atmosphere exhibits broadband NIR luminescence in the 500–1150 nm wavelength range under approximately 360 nm near-ultraviolet (NUV) excitation. The emission peak wavelength is about 740 nm, with a full-width at half maximum (FWHM) of 225 nm and an average lifetime of several hundred microseconds. Combining photoluminescence (PL), absorption (Abs), and electron paramagnetic resonance (EPR) spectroscopy, we proposed that this NIR emission originates from the tetrahedral impurity Fe 3+ coordinated with F − or S 2− in the glass. The presence of F and S alters the symmetry of the local coordination of Fe 3+ centers, resulting in increased splitting of the d-electrons, hence, enhancing the luminescence of the d→d transition. In addition, an NIR gc-LED device is developed by coupling NIR fluorescent glass with a 365 nm commercial near-ultraviolet light-emitting diode (LED). This NIR gc-LED device can be utilized for nondestructive internal detection, nondestructive imaging of blood vessels in the human finger, and night vision. The transparent glass developed in this work is an excellent addition to the group of novel NIR materials and displays significant potential for NIR luminescence applications.
研究领域:
材料科学
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光学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ganggang Guo,Qiong Xi,Tao Yin,Jianju Nie,Yayuan Zhang,Li Guan,Zhenyang Liu,Fenghe Wang,Xu Li
Broadband near-infrared (NIR) phosphors are key materials for the preparation of NIR phosphor-converted light-emitting diodes (pc-LEDs). The wider coverage of the NIR spectrum means that more substances can be detected by NIR light and more applications are possible. However, ultra-broadband NIR phosphors with the full-width at half maximum (FWHM) greater than 200 nm still face challenges in terms of thermal stability as well as internal quantum efficiency (IQE). In this work, a series of La 2 CaTa x Zr (1- x ) O 6 (LCTZO): Cr 3+ phosphors was successfully synthesized by the high-temperature solid-phase method. The non-equivalent substitution strategy of Ta 5+ in place of Zr 4+ effectively modulates the crystal field environment of Cr 3+ and reduces the number of defects, thus modulating the luminescence properties of the phosphor. Under the 471 nm excitation, the spectrum of La 2 CaTa 0.3 Zr 0.7 O 6 : 2 % Cr 3+ can cover the 700–1400 nm band (FWHM = 201 nm) with IQE of 42.6 %, and the emission intensity can be maintained at 373 K at 74 % of that at room temperature . The prepared NIR pc-LED with ultra-wide spectral coverage shows better potential applications in the fields of night vision and biological tissue penetration.
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
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分子成像
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光电子学
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纳米医学
✓ 已验证
DOI
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 6
·768-775
·
IF 6.099
Lingling Xie,Bingkun Chen,Fa Zhang,Ziheng Zhao,Xinxin Wang,Lijie Shi,Yue Liu,Lingling Huang,Ruibin Liu,Ruibin Liu,Bingsuo Zou,Yongtian Wang,Yongtian Wang
Lead halide perovskites have drawn extensive attention over recent decades owing to their outstanding photoelectric performances. However, their toxicity and instability are big issues that need to be solved for further commercialization. Herein, we adopt a facile dry ball milling method to synthesize lead-free Cs3Cu2X5 (X=I, Cl) perovskites with photoluminescence (PL) quantum yield up to 60%. The optical features including broad emission spectrum, large Stokes shift, and long PL lifetime can be attributed to self-trapped exciton recombination. The as-synthesized blue emissive Cs3Cu2I5 and green emissive Cs3Cu2Cl5 lead-free perovskite powders have good thermal stability and photostability. Furthermore, UV-pumped phosphor-converted light-emitting diodes were obtained by using Cs3Cu2I5 and Cs3Cu2Cl5 as phosphors.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xuewan Lin,Jiyou Zhong
Near-infrared (NIR) phosphors are key components for NIR phosphor-converted light-emitting diodes (pc-LEDs), which serve as compact light sources for a range of smart spectroscopic applications. However, developing an efficient, low-cost, and broadband NIR phosphor with a long-wavelength emission peak beyond 900 nm remains a considerable challenge. Guided by design principles summarized here, we selected the double-perovskite Ca2MgTeO6 as a host for Fe3+ doping. Systematic analysis of the crystal and electronic structures reveals the crystal’s strong potential for generating efficient NIR luminescence. Experimental results confirm that the optimally doped sample exhibits NIR emission centered at 944 nm and achieves a remarkably high photoluminescence quantum yield (PLQY) of 87.8% under 310 nm excitation. Finally, the developed material was successfully applied in nondestructive testing, night vision, and information encryption, realizing multifunctional applications.
研究领域:
材料科学
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光学材料
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固态照明
·
发光学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
S. Zhang,Y. Liu,J. Yin,X. Zhang,Y. Li,L. Su,Z. Zhou,M. Xia
Plant factory, a new agricultural planting technology, has emerged and rapidly grown in recent years, with phosphor conversion light emitting diodes (pc-LEDs) considered as the first choice of source light for the plant factory. In this study, a new type of Cr 3+ -activated Li 2 MgTi 3 O 8 phosphor (LMT: Cr 3+ ) was synthesized by high temperature solid state method. X-Ray diffraction patterns showed that there was no detectable impurity in these samples. The photoluminescence spectra revealed that this phosphor can emit far-red light with the peak at 740 nm excited by ultraviolet and blue light, overlapped well with the P FR . After introducing Zn 2+ ions (LMT: Cr 3+ , Zn 2+ ), the luminescence intensity increases by 46% mainly due to the increase of lattice distortion, and internal quantum yield was improved from 25.4% to 41.3% under 365 nm excitation. Finally, the pc-LED devices, consisting of 470 nm chip coated with the optimal phosphor, exhibited good luminescence and overlapping with P FR . These results indicate that the LMT: Cr 3+ , Zn 2+ phosphor has the potential application in modern agriculture.
研究领域:
材料科学
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光电技术
·
农业技术
·
植物生理学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiaozhong Wu,Decai Huang,Qiuming Lin,Lei Han,Weixiong You,Jing Zhu,Xinyu Ye
The research on near-infrared (NIR) phosphors has become a trending topic, as their optical properties directly impact the performance of the NIR phosphor-converted light-emitting diode (pc-LED). NIR pc-LED has emerged as a multifunctional light source across various fields due to its unique advantages of high penetration and invisibility. Herein, a peculiar broadband NIR-emitting phosphor is presented, RbAl3P6O20: Cr3+ (RAPO: Cr3+), with an NIR emission range from 650 to 1000 nm and peaking at ∼785 nm with a full-width at half-maximum (fwhm) of ∼1900 cm–1. Gaussian fitting analysis reveals that broadband emission originates from Cr3+, occupying two different octahedral sites in the host. The optimized phosphor RAPO: 0.08Cr3+ exhibits an internal quantum efficiency of 60% and excellent thermal stability (90% at 423 K). The application of pc-LED devices was evaluated by assembling a RAPO: 0.08Cr3+ phosphor with an InGaN-based LED (450 nm), achieving a remarkable NIR output power of 27.9 mW at 120 mA. The results demonstrate that RAPO: Cr3+ is an optimistic phosphor for NIR photoelectron (pc-LED) light sources.
研究领域:
材料科学
·
光电子学
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固态照明
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光谱学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hangzhang Kou,Fanlei Qin,Jianfeng Wang,Esmaeil Heydari,Gongxun Bai
Near-infrared (NIR) wireless communication has been widely investigated because of its fast transmission speed and good penetration barrier performance. Despite their promising characteristics, the implementation of these materials is substantially limited by thermal degradation effects. To address this challenge, we developed Cr3+-activated gadolinium gallate phosphors that exhibit an emission bandwidth of 92.8 nm at half-maximum intensity while maintaining 86.3% of the initial luminous intensity at 150 °C. Furthermore, phosphor-converted light-emitting diodes (pc-LEDs) were manufactured, attaining a 1060 mW NIR output power and 360 mA current. The device was used to test the signal transmission effect using the prepared NIR pc-LEDs as the light source. In the case of input sine wave, inverse sine wave, and triangle wave, the transmission of the waveform was realized, and its penetration performance was tested. The experimental findings demonstrate that the proposed material exhibits promising applications in NIR optical communication systems.
研究领域:
材料科学
·
光学通信
·
固态照明
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光子学
·
半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 22
·5960-5968
·
IF 7.779
Qiqiong Ren,Jian Zhang,Maxim S. Molokeev,Guojun Zhou,Xian-Ming Zhang
Low-dimensional metal halides have emerged as promising platforms for the development of new-generation phosphor-converted light emitting diodes (pc-LEDs), in which zero-dimensional (0D) hybrids with lone-pair ns2 states, in particular, show unprecedented competitiveness owing to their fascinating photoluminescence (PL) properties. Herein, we designed a novel 0D indium hybrid, (C20H20P)2InCl5, and proposed a co-doping strategy to incorporate Bi3+ (6s2) and Sb3+ (5s2) ions into this indium hybrid. Widely tunable emissions from blue to red are achieved, which are assigned to the triplet self-trapped excitons (STEs) (3P1 → 1S0) of Bi3+ (476 nm) and Sb3+ (658 nm), respectively. Importantly, an uncommon triplet–triplet energy transfer from Bi3+ to Sb3+ contributes to tunable dual emissions, and enables a single-phase cool white-light emission under ultraviolet (UV) excitation. Moreover, the energy transfer mechanism is discussed clearly by fluorescence photon dynamic analysis and DFT calculations. This work provides a deeper insight into triplet–triplet energy transfer, as well as presents a new model system for tuning the PL behaviours of ns2 configuration dopants.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 39
·2508768
·
IF 26.8
Lei Zhong,Yuefei Xiang,Shiwen Liu,Zaidong Chen,Qingyu Kong,Zhaowen Bai,Yang Ren,Fangxi Xie,Chunyan Jiang,Lei Zhou,Jean-Claude G. Bünzli,Mingmei Wu
Near-infrared (NIR) light sources hold great potential for applications in night vision illumination, bio-imaging, and non-destructive testing. However, radiationless de-activation and low absorption restrict the development of high-efficiency blue light excitable NIR phosphors, especially for emissions beyond 900 nm. Herein we report a high-performance Cr 3+ -activated forsterite (Mg 2 SiO 4 :1.5%Cr 3+ , 5%Li + ) phosphor exhibiting broadband NIR emission peaking at 960 nm with a record external quantum efficiency (EQE) up to 48%. The introduction of Li + as a charge compensator and symmetry distorter not only suppresses Cr 4+ formation but also enhances the cross section of Cr 3+ d - d forbidden transitions in Mg 2 SiO 4 . More importantly, Li + promotes excited-state energy transfer between Cr 3+ emitters, yielding exceptional thermal stability and external quantum efficiency. A fabricated NIR phosphor-converted light-emitting diode (LED) achieved a NIR radiated power of 356 mW (at a driving current of 700 mA) and an electro-optical conversion efficiency up to 12.9% (at 100 mA). This work unlocks new possibilities for smart spectroscopy applications, from non-destructive testing to human angiography and biometric recognition.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
发光
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhongyu Tong,Jiamin Li,Yuqing Yan,Feifeng Huang,Guanyu Zhu,Huanping Wang,Hua Yu,Degang Deng
The development of tunable broadband near-infrared (NIR) fluorescent materials with excellent luminescent properties is still a challenge for the next generation of intelligent NIR light sources. Here, a series of Cr 3+ doped magnetoplum type NIR phosphors were prepared by the high-temperature solid-state method. Their luminescent properties and the methods to broaden the luminescence bandwidth were discussed in detail. In BaAl 12 O 19 : Cr 3+ phosphor, Cr 3+ -Cr 3+ ion pair was constructed based on heavily doped Cr 3+ ions, so as to broaden its spectral emission range. With the increase of Cr 3+ doping concentration, the full width at half maximum (FWHM) of BaAl 12 O 19 : Cr 3+ sample increased from 18.5 nm to 93.7 nm. Furthermore, the crystal field environment of Cr 3+ ions in BaAl 12 O 19 : Cr 3+ phosphors was changed by cationic substitution (Sr 2+ substituted Ba 2+ ion site). The FWHM of NIR emission increases from 49.37 nm to 123.78 nm, and the internal quantum efficiency (IQE) increases from 65.6 % to 76.2 %, with good thermal stability ( I 373 K / I 298 K = 77.3 %). An intense NIR emission of 31.3 mW at 100 mA is produced by the phosphor-converted light-emitting diode (pc-LED), exhibiting a photoelectric efficiency of 15.3 %.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
发光光谱学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Peng Chunli,Tang Baoling,Zhang Xuejie,Molokeev Maxim S.,Zhang Haoran,Lei Bingfu
Near-infrared (NIR) spectroscopy has significantly advanced NIR light sources. However, creating NIR emitters with optimal luminescence properties, high thermal stability, and adjustable emission peaks poses a critical challenge for future smart NIR devices. We introduced a chemical unit cosubstitution strategy by incorporating Ca 2+ and Sn 4+ ions into the garnet structure. Through this approach, Y 3− y Ca y Ga 4.95− y Sn y G 12 :0.05Cr 3+ ( y = 0–1) phosphors were developed by modulating the A&C ligands, resulting in emission centers ranging from 708 to 768 nm. The modified local environment of Cr 3+ accounts for the increased light intensity (2.71 times) and broadening observed. Furthermore, this study investigated the impact of varying Cr 3+ concentrations (Y 2.6 Ca 0.4 Ga 4.6− x Sn 0.4 G 12 : x Cr 3+ ) on the production of high-performance phosphors. Compared with Y 3 Ga 4.93 G 12 :0.07Cr 3+ , the optimized phosphor exhibited exceptional external quantum efficiency (EQE = 34.96%). The luminescence enhancement is attributed to an increase in radiative transitions caused by octahedral Jahn-Teller distortion, whereas the notable thermal stability (91.3% at 423 K) is attributed to the presence of weak electron-phonon coupling (EPC) and oxygen vacancy (O V ) defects. Finally, by combining it with a 450 nm blue LED chip, we constructed a near-infrared phosphor-converted LED (NIR pc-LED) device with superior electroluminescence efficiency (18.8% @ 100 mA), increasing the ultralow quenching rate (< 5% intensity loss after 30 days of operation) and demonstrating remarkable performance in plant lighting applications.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
植物生物技术
✓ 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）