Laser & Photonics Reviews
·
2025
·
IF 10
Weidong Zeng,Xinyu Zhang,Rundong Tian,Shuxing Li,Rong-Jun Xie
Laser-driven solid-state lighting is recognized as next-generation high-power and super-brightness lighting sources, but the color temperature of which is greatly limited by scarcity of efficient orange–red color converters. To address this issue, a thermally robust phosphor ceramic of Ca 1- x - y Li x Al 1- x - y Si 1+ x + y N 3- y O y :Ce 3+ (CALSON:Ce is reported, with chromatic coordinates of x = 0.15 and y = 0.1) prepared by spark plasma sintering. Highly efficient CALSON:Ce phosphor powders are first synthesized by “seed” sintering and further treated by acid washing, demonstrating an external quantum efficiency (EQE) as high as 66% and a photoluminescence retention of 91% at 200 °C. The phosphor ceramic fabricated at 1600 °C has the highest EQE of 57% and luminous saturation threshold of 19.58 W mm −2 . By coating the CALSON:Ce ceramic with a La 3 Si 6 N 11 :Ce (LSN:Ce) phosphor layer, white light can be generated under blue laser excitation with a power density of 11.28 W mm −2 , achieving a color temperature of 4943 K, a luminous flux of 675.76 lm, and a luminous efficacy of 119.81 lm W −1 . This work proposes a “seed” sintering method that enables to improve the quantum efficiency of phosphors and ceramics.
研究领域:
材料科学
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光学工程
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固态照明
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光子学
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 23
·2000976
·
IF 8.286
Yayun Zhou,Changkai Yu,Enhai Song,Yuanjing Wang,Hong Ming,Zhiguo Xia,Qinyuan Zhang
Narrow-band red-emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K 2 SiF 6 :Mn 4+ (KSFM) single crystal phosphors with tunable sizes (20–1000 µ m) are grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn 4+ -rare interface layer in KSFM single crystals enables the simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal quenching, and dissipation for high-power and laser-driven lighting applications. As a prototype, a warm white laser diode device with a high luminous flux of 202.7 lm and correlated color temperature of 3277 K, as well as a color rendering index of 87.9 is presented. This work provides new insights into the development of highly efficient and stable materials for advanced lighting applications.
研究领域:
材料科学
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光学工程
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发光材料
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2020
·
IF 3.104
Jie Wang,Xiusha Peng,Danzhao Cheng,Zhigang Zheng,Hai Guo
Single-phase Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors with adjustable luminescence were successfully prepared by high-temperature solid-state reaction method. The structural, luminescent properties and energy transfer (ET) process of Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors were systematically analyzed with the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), excitation spectra, emission spectra and photoluminescence decay curves. Tunable luminescence ranging from green through yellow and definitively to red can be achieved by elevating amounts of Eu 3+ ions in Tb 3+ ,Eu 3+ co-doped samples. Besides, the ET mechanism and efficiency were also analyzed and the maximum ET efficiency is 67%. All the results show that Y 2 BaAl 4 SiO 12 :Tb 3+ ,Eu 3+ phosphors can be used in solid-state lighting.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
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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
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 11
·10454-10464
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IF 2.195
Yao Jiao,Ye Huihua,Wang Xusheng,Li Yanxia
The xMg 2+ /ySm 3+ ions co-doped CaTiO 3 :0.12Eu 3+ red phosphors were synthesized by solid-state reaction method and their structure, crystalline morphology, luminescent properties, decay curves and quantum efficiency were investigated in detail. The XRD patterns show these phosphors have an orthorhombic perovskite structure when the sintering temperature was 1350 °C. From photoluminescence spectra, two excitation peaks were observed located at 397 nm ( 7 F 0 → 5 L 6 ) and 465 nm ( 7 F 0 → 5 D 2 ), and there are two prominent red emission peaks around 595 nm ( 5 D 0 → 7 F 1 ) and 616 nm ( 5 D 0 → 7 F 2 ) corresponding to the magnetic dipole transition and electric dipole transition of Eu 3+ respectively. The luminescent properties were improved by adjusting Mg 2+ and Sm 3+ ions co-doping concentration and their optimal doping amount was found to be 7 mol% and 0.5 mol%. At this moment, their internal quantum efficiency was measured to be 52.4% and 47.5% respectively and decay times were 0.64 ms and 0.59 ms. According to concentration quench theory, the critical distance between activators in CaMTiO 3 :Eu 3+ (M = Mg, Sm) were 15.27 Å and 15.07 Å. CaTiO 3 :Eu 3+ phosphor’s thermal stability has been improved a lot due to Mg 2+ introduction. When temperature increases from 248 to 388 K, the red emission intensity of CaMg 0.07 TiO 3 :0.12Eu 3+ and CaMg 0.07 TiO 3 :0.12Eu 3+ ,0.005Sm 3+ phosphors have decayed only 12.1% and 15.9% respectively. These experimental results have indicated that the synthesized red phosphors can be used in solid state lighting devices.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMEDICAL OPTICS
·
2025
·Vol. 30
·期 4
·046501
·
IF 2.9
Huaiyuan Zhang,Yiting Hu,Xingwei Pu,Shizheng Zhang,Yi He,Kun Chen,Ziji Liu
Significance The multiplexing capabilities of fluorescence imaging are enhanced by its exceptional molecular specificity with diverse fluorescent probes, making it a powerful tool for studying complex biological structures, organization, and functions. Recent advances in super-resolution fluorescence microscopy have further revolutionized our ability to explore biology and related fields. However, current multicolor super-resolution fluorescence imaging systems often come with high costs and bulky designs. Aim We present a multicolor extended resolution fluorescence imaging system that uses light-emitting diode to simplify the optical path, make the design more compact, and reduce system costs. Approach This multicolor extended resolution fluorescence imaging system is based on structured illumination, utilizing a simple diffraction unit positioned between the light source and the sample in a wide-field microscope. Notably, this design could be easily integrated into standard widefield microscopes as a convenient add-on unit, enabling extended resolution imaging. Results Our system demonstrates concurrent extended resolved imaging of three-color microsphere beads and successfully showcases multicolor extended resolution fluorescence imaging of biological tissue samples, revealing intricate structural details. Conclusions This system provides a structurally simple, cost-effective alternative to traditional microscopes, offering flexible multicolor extended resolution fluorescence imaging and potential applications in multimodal imaging.
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DOI
PubMed
高影响因子
OPTICAL ENGINEERING
·
2023
·
IF 1.3
Jie Zheng,Xian Wu,Wenkai Zhang,Jiahao Cheng,Ke Liu,Guijie Liang,Xin Zhang,Jingyang Wang,Yating Zhang,Qingsong Hu
In recent years, lead-free metal halide luminescent materials have attracted extensive attention because of their excellent properties including but not limited to good environmental compatibility, ultrawide emission band, and high photoluminescence quantum yield. They are considered to have great application potential in the photoelectric field. We modified the previously reported synthesis and prepared pure phase Cs2SnCl6 : Bi3 + , Te4 + using simple solution method. Then the emitter was further coated with polysiloxane to form polysiloxane luminescent ceramic (PSOLC). The prepared PSOLCs have almost the same luminescence as the powders, and their color coordinates and color temperature can be tuned freely by adjusting the ratio of blue and yellow emission, which both encourage outdoor-lighting application. Additionally, they are demonstrated to support flexible luminescence and show highly improved machinability. To test their performance in practical application, we apply the PSOLCs to safety identification board and finally get a satisfactory result, directly indicating that the PSOLCs prepared from lead-free perovskite are quite suitable for flexible-lighting-related display 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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zelong Jiang,Tao Hu,Fanchao Men,Hong Yang,Wei Lv,Dawei Wen,Qingguang Zeng,Yan Gao
The pursuit of efficient red emitting Eu 2+ doped oxide is endless, aiming to replace the state-of-the-art CaAlSiN 3 :Eu 2+ nitride counterpart to achieve cheaper and more stable warm illumination. Herein, we identify a hitherto unreported CaLuGaO 4 olivine compound. The crystal structure of the compound is belong to orthorhombic Pnma . Phonon dispersion relations have no imaginary frequency, verifying thermodynamic stability of the crystal structure. It structurally contains an octahedral Ca 2+ site that definitely has strong crystal field splitting energy, which motivates us to incorporate it with Eu 2+ to realize red emission through 4 f 6 5 d 1 → 4 f 7 transition of the octhdedral Eu 2+ ion. This goal is achieved as found the divalent Eu 2+ is necessarily stabilized in this site under CO sintering atmosphere rather than H 2 /N 2 . The as-designed CaLuGaO 4 :Eu 2+ exhibits impressively appealing properties, i.e., intense red emission at 650 nm (λ ex = 450 nm), with high PLQY up to 86 % and good thermal stability in temperature range 10–500 K, marking it as a promising and formidable red phosphor in warm illumination. The excellent emission properties are theoretically revealed to associate with the closed-packed dimensional crystal structure with high Debye temperature equals 440 K, which reduces the non-radiative recombination loss. The investigations in electron-vibrational interaction in the Eu 2+ :5 d state disclosing the interaction is intermediate coupling regime with Huang-Rhys factor of 4.3. As a proof-of-concept experiment of the red phosphor for illumination, a prototype WLED possession of low CCT = 3917 K, high Ra = 92.2, and excellent luminous efficiency = 110 lm/W is constructed, and a portable rechargeable LED flashlight is assembled, by utilizing CaLuGaO 4 :Eu 2+ phosphor as a key red convector. Moreover, we have also demonstrated the phosphor synthesized under H 2 /N 2 can apply for latent fingerprint visualization.
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 MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Yanrong Liang,Xiangjia Sun,Tongtong Zhu,Haitao Wang,Shuo Wang,Xiaojuan Liang,Weidong Xiang,Weiwei Huan,Jie Li,Junlong Wang
In recent years, the development of solid-state lighting devices has increasingly shifted towards high-power laser illumination, making it imperative to develop fluorescent conversion materials with exceptional thermal stability and luminous quality. In this study, we introduced a highly reflective TiO 2 substrate in combination with a high thermal conductivity AlN substrate to design a Ce:YAG-PiG-TiO 2 -AlN Film (Ce:YAG PTAF) color converter with outstanding photothermal performance. Remarkably, the thermal conductivity of this material reaches 48.28 W m −1 K −1 . Notably, the optimized PTAF can withstand a high-power output of up to 12.14 W in a static environment, with a maximum luminous flux (LF max ) of 2284.6 lm and maximum luminous efficacy (LE max ) of 222.35 lm W −1 , showcasing its excellent optical properties. Furthermore, the fabricated Ce:YAG-PiG-TiO 2 -AlN-Wheel (Ce:YAG PTAW), equipped with a motor operating at 7200 r/min, emits an extraordinary brightness of 4404 lm under 88 W of ultra-high laser irradiation, with stability surpassing that of commercial silicone color wheels, thanks to its superior Li 2 O-Al 2 O 3 -SiO 2 (LAS) glass system. Interestingly, we designed an innovative spatially separated two-color segmented wheel structure, effectively mitigating the photon reabsorption phenomenon caused by the overlap of the fluorescent powder absorption peaks. When the ratio of Ce:YAG to Ce:GdYAG is 240:120, it yields white light with a color rendering index (CRI) of 80.2, and luminous flux remaining at 3317.8 lm. When encapsulated in a reflective module, it accurately reflects the true color states of objects. These results collectively indicate that both Ce:YAG PTAF and PTAW possess significant application potential in the realm of high-power laser illumination.
研究领域:
光学材料
·
固态照明
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xin Bao,Ke Zhao,Zhen Tian,Wenquan Sun,Hui Wang,Zixuan Liu,Lijia Zhao,Hui Li,Xi Yuan
Long-lived thermally activated delayed fluorescence (TADF) emission has gained extensive attention due to its potential application in information encryption, illumination, and bioimaging. However, developing visible light-excited TADF materials is still a significant challenge. Herein, visible light triggered TADF emission was achieved by embedding chlorine doped carbon dots (Cl-CDs) into a g-C3N4 nanosheet matrix through a simple microwave treatment. The strong electron-withdrawing effect of the chlorine dropping redshifts the excitation wavelength, and the covalent bonds between Cl-CDs and the matrix significantly stabilize the triplet state. Green TADF with a peak at 520 nm could be obtained in the Cl-CD composite when excited by the UV to visible light, and the afterglow signal can be observed by the naked eye for up to 5 s after a mobile phone flashlight irradiation. The composite also exhibited temperature-responsive color stability under UV light irradiation. Consequently, the Cl-CD composite was successfully employed in concepts of information encryption and single-component time delay WLED development. This research provides materials and strategies that may motivate the visible light-excited TADF applied in advanced information encryption and illumination areas.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Zhenxing Qin,Wenhai Wang,Ming Wen,Rui Zhang,Qingmei Zhang,Kun Li,Jinhong Li,Wen Yang,Yi Zhou
Multicolor emissive carbon dots (CDs) have potential applications in many fields such as photoelectric display, light-emitting devices, and bioimaging. Such CDs by heteroatom doping of nitrogen elements assisted with various solvents has achieved recently, yet generally low efficiency in red-light region. Herein, we developed a facile route to synthesize multicolor-emissive CDs governed by a solvothermal method of tetrahydrofuran solvent. The maximum emission locates at 432, 510, and 584 nm with the absolute FL QYs up to 21.1%, 11.0%, and 55.4% for selected B-CDs, G-CDs, and YG-CDs, respectively. By means of the analysis on their PL spectra, fluorescence lifetimes , and microstructures, the different graphitic degrees and surface states formed under the participation of S and N elements in as-prepared CDs determine the fluorescent color, and large sp 2 -conjugated domains within the YR-CDs is closely related to high QY. They, likewise, endow the YR-CDs with high sensitivity for ion detections of Ag + and Fe 3+ , which was further illustrated to have different quenching mechanisms each other due to the affinity interaction with different surface groups of the CDs. High PL QYs of these CDs emission are beneficial to application in solid lighting, phosphors dried by these CDs solutions were mixed with PVP water solution to fabricate CDs/PVP films. The films exhibited stable fluorescence, and three phosphors were also mixed together in proportion to obtain white-light film with a CIE coordinates of (0.34, 0.34), which demonstrates that these CDs are potentially fluorescent nanomaterial in the solid-state lighting field.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Haonan Yu,Jingming Chan,Balaji Devakumar,Xiaoyong Huang
High-efficiency far-red emitting phosphors with an emission peak of around 730 nm are urgently needed for indoor plant growth light-emitting diode (LED) lighting. In this article, we report on the synthesis, crystal structure, and luminescence properties of a new highly efficient Mn 4+ ion-activated Li 3 La 3 W 2 O 12 (LLWO) far-red emitting phosphor. A group of LLWO:Mn 4+ phosphors doped with different Mn 4+ ion concentrations have been prepared via the conventional high-temperature solid-state reaction route. X-ray diffraction Rietveld refinement reveals that the LLWO:Mn 4+ phosphor has the monoclinic structure with space group P2 1 /n , along with lattice parameters of a = 5.5396 Å, b = 5.6026 Å, c = 7.8802 Å, α = γ = 90°, β = 90.0988°, and V = 244.57 Å 3 . Interestingly, LLWO:Mn 4+ phosphors can generate bright narrowband far-red emission in the 650–800 nm wavelength range peaking at 719 nm due to the spin- and parity-forbidden 2 E g → 4 A 2g transition of Mn 4+ ions, matching well with the absorption spectrum of phytochrome P FR . The excitation spectrum monitored at 719 nm has a broad excitation band with the range from 250 to 550 nm centered at 339 nm and 472 nm, indicating that LLWO:Mn 4+ phosphors could be efficiently pumped by both ultraviolet and blue LED chips. The highest far-red emission is achieved for the sample doped with 1.2 mol% Mn 4+ ion, and this optimal LLWO:1.2%Mn 4+ sample shows a high internal quantum efficiency of 88.4% and a decay lifetime of 2.289 ms. Commission Internationale de l’Eclairage (CIE) color coordinates of LLWO:1.2%Mn 4+ are determined to be (0.7326, 0.2674). Besides, the crystal field analysis and temperature-dependent emission spectra of the as-prepared samples have been investigated in detail. The emission intensity of LLWO:1.2%Mn 4+ sample at 423 K remains about 40% of that at 303 K. Finally, a LED device is fabricated by integrating the LLWO:1.2%Mn 4+ phosphors and a 460 nm blue LED chip, which shows bright blue and far-red dual emission bands under 20–300 mA driving currents. This work demonstrates that these newly developed far-red emitting LLWO:Mn 4+ phosphors have excellent application prospects in plant growth LED lighting.
研究领域:
材料科学
·
园艺学
·
光学工程
✓ 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）