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 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
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 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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Muhammad Amin Padhiar,Shaolin Zhang,Fangrong Qin,Minqiang Wang,Yongqiang Ji,Noor Zamin Khan,Nisar Muhammad,Sayed Ali Khan,Jahangeer Ahmed,Shusheng Pan
Lead-free double perovskites (DPs) in the form of two-dimensional (2D) nanosheets (NSs) have emerged as exceptional candidates compared to zero-dimensional (0D) nanocrystals (NCs). This preference is attributed to their intriguing fundamental properties and promising applications in optoelectronics. Notably, NSs offer superior performance due to their enhanced surface passivation capabilities, facilitating more efficient treatment of surface defects and thereby enhancing optoelectronic properties. However, the realization of Cs 2 NaInCl 6 as lead-free DPs NSs is yet to be achieved. In this study, we successfully synthesized Cs 2 NaInCl 6 co-doped with Bi 3+ /Mn 2+ NSs. The two-step solution process synthesis enables us to achieve dimensionality control, progressing from 0D NCs to 2D NSs. Comprehensive optical spectroscopy analyses reveal that the NSs exhibit a suppressed non-radiative decay rate ( Knr ) of 5.03 × 10 −3 ns −1 in contrast to NCs with a Knr of 3.21 × 10 −2 ns −1 . This observation is indicative of a well-passivated surface in NSs. In contrast, NSs with identical composition and surface morphology significantly enhance the photoluminescence quantum yields (PLQYs) up to 73%, which represents the highest PLQYs recorded in Cs 2 NaInCl 6 DPs to the best of our knowledge. Beyond fundamental investigations, the study explores the practical applications of these NSs as anti-counterfeit marks created on a flexible substrate, demonstrating robust emission under UV light. Additionally, the fabrication and testing of a light-emitting diode (LED) showcase the versatility of these NSs in optoelectronic devices. This comprehensive exploration of the optical, morphological, and application aspects of Cs₂NaInCl₆ doped with Bi³⁺/Mn 2 ⁺ NSs contributes valuable insights to the evolving landscape of lead-free perovskite materials, highlighting their potential for diverse technological 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
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Jian Li,Zhi-yong Mao,Da-jian Wang,Ying-chun Zhu,Lin Gan,Fang-fang Xu
Tunable white light of Eu 2+ doped SiAlON crystal/glass composite phosphor with blue-yellow dual-emissions was demonstrated by variation of excitation wavelength in this work. The excitation properties of blue emission originated from the transition of Eu 2+ ions in the Si–Al–B–O–N glass matrix and that of yellow emission originated from the transition of Eu 2+ ions in the SiAlON lattice were investigated, respectively. By varying the excitation wavelength in the range of 330–380 nm, white emission was tuned from cool white to warm white for this SiAlON crystal/glass composite phosphor owing to the various excitation properties of these two emission bands. Presented results indicate that this tunable SiAlON crystal/glass composite white-light phosphor might be applied in white LED, combining with UV chips with different emitting wavelengths in the range of 330–380 nm.
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 Chemistry C
·
2022
·Vol. 10
·期 28
·10292-10301
·
IF 8.067
Zixuan Wu,Xinxin Han,Juan Wang,Yayun Zhou,Ke Xing,Sheng Cao,Jialong Zhao,Bingsuo Zou,Ruosheng Zeng
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) is a prospective next-generation light source for smart and broadband NIR spectroscopy. However, the improvement of photoluminescence quantum yield and thermal quenching stability is still a crucial challenge for the pc-LED related broadband NIR phosphors. Herein, a highly efficient and thermally stable broadband NIR emitting fluoride phosphor Cs2KGaF6:Cr3+ is fabricated, which exhibits a full width at half-maximum (FWHM) of 110 nm centered at 782 nm. Notably, the phosphor exhibits an ultra-high internal quantum efficiency (IQE) of 90.2% and excellent thermal stability (I150 °C = 88.7%). The excellent anti-thermal quenching behavior is attributed to the relatively weak electron–phonon coupling effect in Cs2KGaF6:Cr3+ with a small Huang–Rhys factor of 2.17. Based on the prominent luminescent properties of the phosphor, a NIR pc-LED with a high photoelectric conversion efficiency of 22.05% is fabricated by combining the phosphor with a commercial blue LED chip. Moreover, the NIR pc-LED manifests distinguished performances in night vision security inspection, non-destructive testing, intelligent identification and biomedical imaging, indicating extensive application prospects for the as-prepared Cs2KGaF6:Cr3+ phosphor.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Zhiyu Yang,Guangxiang Lu,Jiani Ma,Tao Yang,Guotao Xiang,Li Li,Xianju Zhou,Zhiguo Xia
The rapid advancements in solid-state lighting have underscored the need for efficient and thermally stable phosphors for light-emitting diode (LED) applications. Herein, a red phosphor CaSc 2 O 4 :Eu 2+ ( λ ex = 450 nm, λ em = 650 nm) is synthesized employing a non-stoichiometric strategy to increase photoluminescence quantum efficiency (PLQY). Spectroscopic and crystallographic properties analysis confirm that the red emission band originates from Eu 2+ ions occupying a single Ca 2+ site with significant nephelauxetic effects and crystal field splitting. Excessive CaCO 3 additions promote the reduction of Eu 3+ and an increase of trap concentration, enhancing the PLQY from 24% to 61% and improving the emission intensities at 150 °C from 8% to 41% of that at room temperature. Versatile LED light sources, including high-quality white LED, red LED in plant growth, and the integrated pixelated intelligent LED matrices have been explored for the practical applications. This study proposes an optimized strategy to enhance the efficiency and thermal stability of Eu 2+ -doped oxide-based red phosphors for multifunctional lighting applications.
研究领域:
材料科学
·
固体照明
·
发光材料
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yanan Li,Shujie Gai,Hui Zhu,Jian Yin,Wenyuan Guo,Maxim S. Molokeev,Xiangyang Lu,Mao Xia,Zhi Zhou
Herein, the strategy of replacing Ge 4+ with smaller Si 4+ was adopted to realize the site-selective occupation of Bi 3+ activator in the small ring and obtain a near-infrared light-emitting in Zn 2 (Ge,Si)O 4 . The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift ( ε c ) and crystal field splitting ( ε cfs ). This work not only provides new insights for the development of Bi 3+ -activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi 3+ .
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yongfeng Liu,Qingyu Xie,Yupeng Ying,Zhaoju Gao,Xiuwen Shao,Weizhi Xia,Min Zhou,Wei Pei,Xiaosheng Tang,Yusong Tu
All-inorganic perovskite quantum dots (PeQDs) hold immense potential for use in light-emitting diodes (LEDs) due to their excellent optoelectronic properties. However, the scalable synthesis and poor stability have severely hindered their application. Here, we solved both the two issues with “one stone”, namely a bipolar ligand 3-(N,N-dimethyloctadecylammonio) propane sulfonate (ASC18). ASC18 contains a positively charged quaternary ammonium group and a negatively charged sulfonic group, which enables for long-term reaction and gram-level synthesis of PeQDs with outstanding morphology, crystallinity, and optical properties. Density functional theory calculations and experimental studies show that these merits arise from the inhibition of Ostwald ripening by ASC18 due to their simultaneous interaction with undercoordinated Br – and Pb 2+ via a bidentate binding mode. Furthermore, ASC18 capped PeQDs present significantly improved stabilities against air, UV irradiation, heat, and polar solvent. Finally, both electroluminescent LEDs and down-conversion white LEDs fabricated with our PeQDs show significant operational stability. This presents a trustworthy avenue to obtain high-quality PeQDs for their practical applications.
研究领域:
材料科学
·
光电领域
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Yang,Wei Lü,Jin Xiang Lim,Biao Wang
There is strong demand of exceptional efficiency for near-infrared (NIR) phosphors for next-generation integrated and intelligent multifunctional light-emitting diode (LED) devices. Designing NIR phosphors with excellent efficiency that simultaneously meet multiple application requirements is challenging. Hence, this work focuses on the NIR optical properties and the corresponding multifunctional applications for Cr 3+ activated LaMgAl 11 O 19 (LMAO) phosphors. The blue light excitable LMAO:Cr 3+ phosphors can produce intense NIR emission ranging from 630 to 1000 nm with an 95.8% internal quantum efficiency as well as excellent thermal stability (I 423 K /I 303 K = 75.9%). Additionally, benefiting from the strong correlation between fluorescence lifetime and ambient temperature, the LMAO:Cr 3+ phosphors were showed promising potential for application in temperature sensing. Notably, the NIR phosphor-converted LED devices based on LMAO:Cr 3+ phosphors and commercial blue LED chip were self-built, which exhibiting great potential for indoor plant cultivation, night vision, and nondestructive detection. This study describes the highly efficient LMAO:Cr 3+ phosphors preparation and the corresponding multifunctional applications in the fields of optical thermometry, indoor plant cultivation, night vision, and nondestructive detection, which is crucial for the next-generation integrated and intelligent multifunctional LED devices.
研究领域:
材料科学
·
光学工程
·
固态照明
·
温度传感技术
·
植物生长技术
·
无损检测
✓ 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）