MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Wenkai Zhang,Chaoyong Deng,Min Zhang
Dy 3 + doped Gd 2 MgTiO 6 (GMT) phosphors were were fabricated using the high temperature solid state method in this study. Fluorescence, UV-visible spectrometer, X-ray photoelectron spectrometer, and Transient fluorescence spectrometer. The results show that the structures of the series of phosphors belong to the monoclinic crystal system, and Dy 3 + was successfully incorporated into the GMT host without affecting its structure. The samples emitted extremely strong blue and yellow light, which are the transitions derived from 4 H 9 / 2 to 6 H 15 / 2 (482 nm) and 6 H 13 / 2 (575 nm) levels, respectively. The sample shows obvious effects of concentration, GMT: 0.11Dy 3 + phosphor has the best photoluminescence (PL) intensity 7.148 × 10 5 , lifetime is 0.16 ms, and an internal quantum efficiency (IQE) is 2.1 % . The Dy 3 + doped sample has a larger energy band gap of 4.11 eV. The prepared samples exhibit color coordinates in proximity to that of standard white light, which indicates that the phosphor GMT: Dy 3 + can be applied to white light phosphors and light-emitting diode (LED) devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiaojian Zhang,Zhiqin Zhang,Yamin Feng,Honglei Yuan,Gaoliang Wang
Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors were synthesized by sintering at 910 °C for 24 h under air in a muffle furnace. The phase, luminescence properties and potential applications in LED devices were investigated. X-ray diffraction results indicate the successful doping of Bi 3+ ions in Ba 3 Lu 2 B 6 O 15 host. The diffuse reflectance and excitation spectra demonstrate the excitability on UV light. Upon the excitation at 365 nm, the Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors show narrowband blue emission with the peak at 417 nm. The highest emission intensity with the quantum yield of 85.7% and ΔE a value of 0.215 eV is generated by the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor. The light characteristics of the UV-pumped LED devices containing the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor demonstrate the potential application of Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors in the lighting field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 13
·9464-9470
·
IF 2.019
Xing Yangyang,Zhu Yingchun,Chang Chengkang,Wang Yunli,Wang Yang
Eu 2+ -doped β-Sialon phosphors with a composition of Eu
x
Si 5 Al 1− x
O z+ x
N 8−z− x
( x = 0.05, 0.06, 0.07) were synthesized in a new synthetic route using novel raw materials, such as nano-silicon dioxide (SiO 2 ), nano-carbon (C), and aluminum (Al). This is different from the prevailing method using Si 3 N 4 , AlN, and Al 2 O 3 to obtain β-Sialon phosphors. Compared with the conventional method, lower cost raw materials, simpler pretreatment and a relatively shorter reaction time are achieved. The phosphors show a high purity. All the phosphors exhibit green emission under ultra violet (UV) radiation. A broad band of excitation spectra implies the promising application in UV ray based green light-emitting diode (LED). Chromaticity coordinates of the β-Sialon: Eu 2+ phosphors demonstrate that it is accessible to obtain different green emissions from single phase of Eu 2+ -doped β-Sialon through adjusting Eu 2 O 3 concentration. Furthermore, the Eu
x
Si 5 Al 1− x
O 1 + x
N 7 − x
( x = 0.05) shows a better thermal stability than the commercial green-emitting silicate phosphor. These results indicate a promising prospect for this efficient and economic route in preparing β-Sialon: Eu 2+ phosphors, and the phosphors are a highly promising candidate for LED applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Chen Dongxun,Lv Xulong,Liang Yanjie
In this work, Dy 3+ -doped Bi 2 SiO 5 nanoparticles with uniform spherical morphology and narrow size distribution have been successfully synthesized using a facile template-assisted approach. The effects of sintering temperature and Dy 3+ doping concentration on the phase composition, morphology, and luminescence properties of Bi 2 SiO 5 :Dy 3+ nanophosphor are systematically investigated through X-ray diffraction, scanning electron microscopy, and photoluminescence (PL) spectroscopy. X-ray diffraction results confirm that the synthesized Bi 2 SiO 5 :Dy 3+ nanospheres exhibit a pure tetragonal phase. Meanwhile, the phosphor particles are composed of monodisperse nanospheres with an average diameter of approximately 265 nm. Upon excitation at 388 nm, intense photoluminescence is noted in the blue ( 4 F 9/2 → 6 H 15/2 ) and yellow ( 4 F 9/2 → 6 H 13/2 ) spectral regions due to the characteristic emissions of Dy 3+ ions. Temperature-dependent PL spectra reveal that the optimized Bi 2 SiO 5 :2.5%Dy 3+ nanospheres maintain extraordinary luminescence thermal stability, retaining 81.0% of its emission intensity at 423 K compared to 303 K. The phosphor also showed remarkable color stability, with CIE chromaticity coordinates shifting minimally from (0.377, 0.413) at 303 K to (0.373, 0.407) at 423 K. This newly developed Bi 2 SiO 5 :Dy 3+ nanospheres exhibit commendable PL properties, enabling them as promising candidates for yellow phosphors in LEDs and display applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 24
·5186-5194
·
IF 6.569
Yan Zhang,Yanjie Liang,Shihai Miao,Dongxun Chen,Shao Yan,Jingwei Liu
A series of Cr3+-doped BaMSi3O9 (M = Zr, Sn, Hf) near-infrared emitting phosphors with tunable luminescence properties have been successfully synthesized by using a simple solid-state reaction method. The developed BaMSi3O9:Cr3+ phosphors show a broad near-infrared emission band ranging from 650 nm to 1200 nm with a peak wavelength longer than 800 nm and a full width at half maximum (FWHM) of more than 155 nm upon blue light excitation. The optimized phosphor also demonstrates good thermal stability, whose emission intensity at 150 °C can retain about 59% of its initial intensity at room temperature. The near-infrared LED prototypes constructed by combining the BaMSi3O9:Cr3+ phosphor with a blue LED chip give a maximum output power of 12.19 mW at a drive current of 320 mA. By using the fabricated near-infrared LED device as a lighting source, night-vision lighting and blood vessel imaging of human fingers and arms are successfully realized, demonstrating the great potential of BaMSi3O9:Cr3+ phosphors for near-infrared LED 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
Materials
·
2017
·Vol. 10
·期 11
·1242
·
IF 2.654
Yangyang Xie,Chong Geng,Yiqun Gao,Jay Guoxu Liu,Zi-Hui Zhang,Yonghui Zhang,Shu Xu,Wengang Bi
In this report, to tackle the thermal fluorescent quenching issue of II-VI semiconductor quantum dots (QDs), which hinders their on-chip packaging application to light-emitting diodes (LEDs), a QD-ZnS nanosheet inorganic assembly monolith (QD-ZnS NIAM) is developed through chemisorption of QDs on the surface of two-dimensional (2D) ZnS nanosheets and subsequent assembly of the nanosheets into a compact inorganic monolith. The QD-ZnS NIAM could reduce the thermal fluorescent quenching of QDs effectively, possibly due to fewer thermally induced permanent trap states and decreased Förster resonance energy transfer (FRET) among QDs when compared with those in a reference QD composite thin film. We have demonstrated that the QD-ZnS NIAM enables QDs to be directly packaged on-chip in LEDs with over 90% of their initial luminance being retained at above 85 °C, showing advantage in LED application in comparison with conventional QD composite film.Keywords:quantum dots;nanosheet;assembly;thermal stability
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Shuang Guo,Shuxue Zhou,Huijing Li,Bo You
This paper presents a facile method to fabricate volumetric light diffusing films with high transmittance and haze simultaneously by mimicking the micro- and nanostructure of compound eyes. Strawberry-like polymethyl methacrylate/SiO 2 composite microspheres were first prepared via the electrostatic attraction between positively charged PMMA spheres and negatively charged SiO 2 nanoparticles , and further blended with polyacrylate latex to produce light diffusing coatings. A novel light diffusing film with hemispherical surface was built by casting the light diffusing coatings on optical-grade PET film. Effects of the sizes of PMMA spheres and SiO 2 nanoparticles on the optical properties of light diffusing film were investigated by a haze meter and application on a LED lamp. The best result (transmittance 94.6% and haze 84.2%) was achieved for the strawberry-like composite microspheres based on 1 μm PMMA spheres and 50 nm SiO 2 nanoparticles. The light-diffusing mechanism of the strawberry-like microspheres in the film was discussed.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Konglan Chen,Shiyu Jia,Xueliang Zhang,Zifan Shao,Yayun Zhou,Ting Fan,Ting Yu,Tingting Deng
Development of highly thermally stable broadband near-infrared (NIR) luminescence materials is crucial for advancing the prolonged stable application of smart NIR light sources. In this study, a zero-thermal-quenching and reversible temperature-dependent broadband NIR-emitting Cs2NaAl3F12:Cr3+ phosphor is demonstrated, benefiting from its stable polyhedron-cluster-building rigid structure. The excellent thermal stability of Cs2NaAl3F12:Cr3+ is rooted in its stable [Al6Na4F45] cluster building unit, which provides a rigid structure with a weak electron–phonon coupling effect and a wide band gap with a huge thermal activated barrier. Such characteristics are well revealed by multiple studies on crystal structure, electronic structure, Huang–Rhys factor S, configuration coordinate model, and Debye temperature. The incorporation of Li or K instead of Na weakens the luminescence thermal stability, directly proving the importance of the stable [Al6Na4F45] cluster for stable Cr3+ substitution and rigid structure construction. Furthermore, Cs2NaAl3F12:Cr3+ presents much superior thermal stability compared to traditional rigid garnet-type fluorides Na3X2Li3F12:Cr3+ (X = Al, Ga, In). A high-power NIR LED is presented, utilizing the high quantum efficiency (∼71%) and extremely thermally stable broadband NIR emission around 750 nm of Cs2NaAl3F12:Cr3+. It realizes clear vein and cartilage imaging in the human hand, demonstrating its potential in medical diagnosis applications. This result provides important insights for designing new-type rigid crystal structures using stable polyhedron clusters as basic units, advancing the development of highly thermally stable NIR-emitting phosphors.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Ruoxian Hou,Chuanying Shen,Hanzhang Chen,Lingqiang Meng,Longyun Xu,Jiyang Wang,Duanliang Wang
Zero-dimensional (0D) organic–inorganic hybrid halides present many fascinating photophysical properties for promising optoelectronic applications such as light-emitting diodes (LEDs), X-ray imaging, photodetectors, and anticounterfeiting. Herein, a centimeter-sized single crystal (C6H10N2)2MnCl6·2H2O with a 0D perovskite structure was obtained via a solvent evaporation method. A bright red emission at 618 nm with a larger Stokes shift of more than 300 nm and a long fluorescence lifetime of 6.21 ms were measured. Notably, a reversible PL switching from red emission to nonluminescence has been presented in the cycles of heating–cooling processes from RT to 100 °C. Furthermore, the temperature-induced luminescence shows a quick recovery after 20 conversion cycles, exhibiting excellent stability and temperature sensing. According to the structural and theoretical analyses, the temperature-induced luminescence is primarily due to hydrogen-bonding interactions between (MnCl6)4– and H2O molecules. Particularly, a temperature anticounterfeiting application has been designed based on its reversible temperature-dependent PL switching. Importantly, the ultraviolet-pumped LEDs fabricated by (C6H10N2)2MnCl6·2H2O single crystals are perfectly achieved. Anyway, this work clearly demonstrates that 0D Mn-based perovskite with temperature-dependent PL switching greatly extends its potential applications in electro-optical display, temperature sensing, and anticounterfeiting devices.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 13
·3941-3949
·
IF 6.1
Guocheng Pan,Yaowu Wang,Jianfeng Wang,Zhenping Wu,Yiheng Yue,Nan Lin,Shiqing Xu,Gongxun Bai
Near-infrared (NIR) phosphor-converted light emitting diodes (pc-LEDs) highly demand broadband NIR phosphors for applications in food safety and smart detection. However, the lack of tunable NIR luminescent materials limits their development. Herein, we constructed a series of NIR Cr3+ doped Ga2O3-based materials with broadband, tunable, efficient emissions by utilizing [Zn2+–Ge4+] and [Ga3+–Ga3+] co-unit substitution. The obtained results show that the emission peak of NIR phosphors can be modulated from 713 to 765 nm. Meanwhile, the excitation peak remains in the blue light region. NIR phosphor-converted devices were prepared with 450 nm LED chips, which were studied using NIR imaging, penetration imaging, anti-counterfeiting, and pupil recognition technologies. Interestingly, NIR mechanoluminescence (ML) was realized based on the developed phosphors, which were successfully applied for non-destructive measurements of solids and in vivo bioimaging. Our study proposes a series of tunable and broadband luminescent materials and devices for NIR applications.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
传感器技术
·
固体物理
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 39
·395703
·
IF 3.874
Zhihua Li,Xin Ding,Bing Yu,Yu Min,Bin He,Youqing Shen,Hailin Cong
Near-infrared (NIR) emission materials can be widely applied in various fields, such as food detection, imaging, treatment, electronic products. With the trend of miniaturization of equipment, smaller materials are needed. In this work, we successfully synthesized a series of M2Ga2GeO7:N3+ (M = Ca, Ba, Sr; N = Cr, Nd, Er) samples and then focused on the study of Nd3+ doped Sr2Ga2GeO7 (SGGO). A series of SGGO:xNd3+ sub-micron phosphors were prepared via a microwave-assisted sol–gel process combined with subsequent calcination at 750 ℃, and the structural information and luminescent properties were systematically studied. SGGO is a representative tetragonal crystal and belonging to the space group of P4¯21m (113). The Nd3+ ions occupy eight-coordinated Sr2+ sites in the crystal lattice. From SEM analysis, the average particle size distribution is 219.7 ± 41.4 nm. The sub-micron phosphors have rich excitation spectra ranging from 350 nm to 850 nm and can produce multiband NIR emissions of 1331, 1056, and 905 nm when excited by ultraviolet and NIR light. The maximum emission intensity was obtained by optimizing the doping ratio of Nd3+ ions. A commercial chip was then utilized to fabricate light-emitting diodes (LEDs) to verify its application potential in NIR-II mini-LEDs. Compared with blue light LEDs, the as-prepared LEDs had good imaging penetration depth and could be clearly observed under 10 mm of chicken breast coverage. The maximum imaging penetration depth can be 33 mm.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Xiaohong Pei,Shipeng Yang,Xinfeng Zhu,Erjian Sun,Xiaohan Hei,Zhongxian Song,Kai Liu
Development of multi-colour emitting phosphors for applications in LED is always a hot topic in rencent years. Herein, we prepared solid solutions K 2 Y 1- x - y Tb x Eu y Zr(PO 4 ) 3 and studied their luminescent properties. Both Tb 3+ and Eu 3+ emission peaks can be generated by using characteristic exciting wavelength of Tb 3+ (378 nm) due to the Tb 3+ →Eu 3+ energy transfer. By simply changing the relative proportions of Tb 3+ /Eu 3+ , the emitting color of phosphors K 2 Tb 1- y Eu y Zr(PO 4 ) 3 changes from green ( y = 0), through yellow ( y = 0.005) to red ( y = 0.08). Thermostability study showed that at 150 °C, the integral intensity is 57% of that at 25 °C, suggesting a good thermostability. Finally, we fabricated three LED lamps by using a 365 nm chip with y = 0, 0.005, 0.08 phosphors, and green, yellow and red light can be observed.
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
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