JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zixuan Wang,Haitao Guo,Xusheng Xiao,Yantao Xu,Xiaoxia Cui,Min Lu,Bo Peng,Anping Yang,Zhiyong Yang,Shaoxuan Gu
0.2%–3% weight of Dy 3+ ions doped 64GeS 2 ·16Ga 2 S 3 ·20CdI 2 glasses were synthesized, and their spectroscopic properties were investigated. It was shown that the host glass could dissolve as much as 3% Dy 3+ ions without deteriorating the glass transparency. The mid-infrared (MIR) emissions of the glasses did not present remarkable concentration quenching when the Dy 3+ ions concentration was less than 0.6%. It was also shown that the MIR emission properties could be significantly improved by reducing S H/O H impurities in the glasses. The spectral analyses indicated that the 2.9 and 4.3 μm emissions of Dy 3+ ions in the glass showed relatively large stimulated emission cross sections. The glass doped with as high as 0.4% Dy 3+ ions was successfully drawn into fibers, indicating good potential of the doped glass for MIR lasers.
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 THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 10
·5910-5918
·
IF 3.094
Renping Cao,Xinyan Lv,Yaqin Ran,Longxiang Xu,Ting Chen,Siling Guo,Hui Ao,Xiaoguang Yu
Li 5 La 3 Ta 2 O 12 :Mn 4+ (LLTO:Mn 4+ ) phosphors are prepared in air via high-temperature solid-state method and investigated for their crystal structures and luminescence properties. LLTO:Mn 4+ phosphor under excitation at 314 nm shows deep-red emission peaking at 714 nm due to the 2 E→ 4 A 2 transition of Mn 4+ ion. The excitation bands in the range 220 - 570 nm are attributed to the Mn 4+ - O 2- charge-transfer band and the 4 A 2g → 4 T 1g , 2 T 2g , and 4 T 2g transitions of Mn 4+ , respectively. The optimal Mn 4+ ion concentration is ~0.4 mol%. The concentration quenching mechanism in LLTO:Mn 4+ phosphor is electric dipole-dipole interaction. The luminous mechanism and temperature quenching phenomenon are explained by the Tanabe-Sugano energy level diagram and the configurational coordinate diagram of Mn 4+ in the octahedron, respectively. The experimental results indicate that LLTO:Mn 4+ phosphor has a potential application prospect as candidate of deep-red component in light-emitting diode (LED) lighting.
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 RARE EARTHS
·
2015
·
IF 1.261
Mengting LI,Baoxiang JIAO
ZnTiO 3 :Eu 3+ phosphors were synthesized with different concentrations of Eu 3+ doping through sol-gel method. The samples were calcined at different temperatures for 2 h in air. The synthesized powders were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), transmission electron microscopy (TEM), Raman and photoluminescence spectroscopy. The XRD results showed that the ZnTiO 3 :Eu 3+ phosphors doped with different concentrations of Eu 3+ ions calcined at 600 °C were of single phase, which indicated that the Eu 3+ ions had been successfully incorporated into the ZnTiO 3 host lattice and did not destroy the lattice structure of ZnTiO 3 host. The Raman spectrum, SEM and TEM also proved that the doping of Eu 3+ did not change the lattice structure of hexagonal ZnTiO 3 host. The photoluminescence (PL) of Eu 3+ ions with the main emission peak at 614 nm was observed to increase with Eu 3+ concentrations from 0.5 mol.% to 2.0 mol.% and decreased when the concentration was increased to 2.5 mol.%. The decrease in the PL intensity at higher Eu 3+ concentrations could be associated with concentration quenching effect. The CIE1931 chromaticity diagram ( x , y ) of ZnTiO 3 :2.0 wt.%Eu 3+ phosphors were located in the red region ( x =0.652, y =0.347). The luminescence properties suggested that ZnTiO 3 :Eu 3+ phosphors might be regarded as a potential red phosphor candidate for light emitting diodes (LEDs).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 20
·16452-16460
·
IF 3.289
Jie Chen,Ye Sheng,Xiuqing Zhou,Murad M. A. Abualrejal,Meiqi Chang,Zhan Shi,Haifeng Zou
Luminescent one-dimensional Eu3+ doped SiO2 fibers have been readily prepared by electrospinning method combined with a sol–gel process. In this work, polyvinylpyrrolidone (PVP) as a simple commercial dendrimer not only increased the viscosity of solution but also provided weak hydrogen bonds with silica, which was significant in improving the electrospinability. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the as-obtained samples present fiber-like morphology with uniform size and the diameters of fibers became wider with the increase of Eu3+ concentration, from nanoscale to microscale. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) indicated that Eu3+ activator ions have been doped into the interstitial sites of SiO2 fibers through the electrostatic interaction, which would reduce the symmetry of SiO2 framework. The photoluminescence (PL) properties include the diffuse reflectance, excitation and emission spectra indicated that the obtained SiO2:Eu3+ fibers exhibited typical Eu3+ (5D0–7FJ) red emission under ultraviolet excitation and the band energy was changed due to the doping of stable Eu3+ activator ions. Meanwhile, the concentration quenching effects and decay kinetics behaviors of SiO2:Eu3+ fibers were investigated and the optimal doping concentration and the longest lifetime were both in the composition of 16 mol% Eu3+. In addition, the energy-dispersive X-ray spectrum (EDS), thermogravimetry differential thermal analysis (TG-DTA) and the formation mechanism were also displayed in order to better understand the work.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Bin Hao,Lihong Zhao,Mingming Zhang,Yan Huang,Wenwu Zhao,Jian Liu
NaBa 12 B 7 O 21 F 4 : x Eu 3+ phosphors, where 0 < x ≤ 0.16, were obtained through the high temperature solid phase reaction method. The phosphors showed significant red fluorescence emission resulting from the dominant 5 D 0 → 7 F 2 transitions. The optimum doping concentration of Eu 3+ ions in the NaBa 12 B 7 O 21 F 4 matrix were estimated to be 14 mol%. The phenomenon of concentration quenching was researched, and the concentration quenching of NaBa 12 B 7 O 21 F 4 : x Eu 3+ phosphors maybe caused by the exchanging interaction of Eu 3+ ions. Moreover, it was found that the optimal-component NaBa 12 B 7 O 21 F 4 :0.14Eu 3+ phosphor showed high absolute luminescence quantum efficiency and had a millisecond fluorescence lifetime.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tianyun Du,Xiaojie Xue,Xiuxun Han
Rare earth activated color converted phosphors have been widely used in solid-state lighting and display fields. Developing phosphors with high luminous efficiency is of great significance for light-emitting devices. Concentration quenching is the main factor limiting the improvement of phosphor luminescence efficiency during increasing the activator doping level. In this study, a novel structural optimization strategy is developed to overcome the impact of concentration quenching. In Tb 3+ activated NaYSiO 4 (NYSO), large-size Gd 3+ ions are introduced to adjust the distance of rare earth ions and suppress the energy transfer between Tb 3+ luminescent centers. It is shown that at a critical Tb 3+ concentration, for which concentration quenching tends to occur in NaYSiO 4 :Tb 3+ , Gd 3+ incorporation successfully raises the internal quantum efficiency from 64.8 % for Tb 3+ -singly-doped NYSO up to 80.6 % for Gd 3+ /Tb 3+ co-doped one. The findings can offer a feasible pathway in promoting the luminescent properties of silicate phosphor hosts.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Li,Yong Hong Ma,Aihua Mao,Xiwei Qi
A series of transparent (1- y )La 2 O 3 –Ga 2 O 3 - y Sm 2 O 3 - x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm 3+ and Eu 3+ enhanced the energy absorption of Eu 3+ , notably improving the characteristic emission peak 5 D 0 - 7 F 2 of Eu 3+ . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu 3+ ions. As the concentration of Eu 3+ increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm 3+ and Eu 3+ , Sm 3+ may primarily serve as the sensitizer, and Eu 3+ as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu 3+ ions and adjacent ions, an increase in Eu 3+ concentration leads to a decrease in the distance between Eu 3+ and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu 3+ concentration, the CIE chromaticity coordinates for the samples co-doped with Sm 3+ and Eu 3+ shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Xiang-Yang Chen,Zhi-Jun Zhang,Ang Feng,Meng Xu,Jing-Tai Zhao,Fang-Fang Xu
Density functional theory calculations on monoclinic Lu 2 WO 6 is carried out using the Cambridge Sequential Total Energy Package code. The result indicates that Lu 2 WO 6 is a broad band gap semiconductor with an indirect band gap of 3.13 eV. Eu ions are trivalency and the average coordination number is 7.6(5), indicating that the site of Lu is occupied by Eu. The activation energy Δ E is calculated as 0.314 eV. In addiation, the thermal quenching mechnism of Eu-activated Lu 2 WO 6 and the different concentration quenching mechanisms for 5 D 0 and 5 D 1 emissions of Eu ions have been proposed.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Shao-rong Bie,Ding-shun She,Wen Yue
A series of Ca 10 (PO 4 ) 6 F 2 :Er 3+ phosphors doped with varying concentrations of Er 3+ concentrations (2–14 mol.%) have been synthesized via a hydrothermal method to investigate their optical spectroscopy and temperature-sensing properties. Rietveld refinements of the XRD data reveal that Er 3+ ions preferentially occupy Ca2 sites rather than Ca1 sites to reduce electrostatic repulsion between cations within the fluorapatite lattice. Morphological characterization using SEM, TEM, and EDS confirms that the synthesized phosphors exhibit a rod-like morphology with dimensions of approximately 2.5 μm in length and 1 μm in diameter, along with an excellent single-crystal structure and uniform elemental distribution. Under 378 nm excitation, the phosphors exhibit prominent green emission peaks corresponding to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. The optimal dopant concentration is determined to be 10 mol.%, with a calculated critical distance of 9.98 Å, indicating that electric quadrupole–quadrupole interactions dominate the concentration quenching mechanism. The luminescence lifetime of the optimized phosphor has been measured as 0.604 ms. Additionally, the chromaticity coordinates (0.3127, 0.6723) and high color purity (98.06 %) highlight the potential applicability of this phosphor in white light-emitting diodes (LEDs) and other optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Cheng Yang,Zhongfang Zhang,Guangcai Hu,Rui Cao,Xiaojuan Liang,Weidong Xiang
Currently, the non-rare-earth Mn 4+ -activated oxide red phosphor is of great interest as color converter for warm white light-emitting diodes (W-LEDs), owing to its admirable luminescent properties and low price. Herein, a novel blue-light activated Ca 14 Zn 6 Ga 10 O 35 :Mn 4+ (CZG:Mn 4+ ) phosphor, exhibiting strong red emission attributed to Mn 4+ : 2 E g → 4 A 2g spin-forbidden transition in region of 650–750 nm under 462 nm excitation, is successfully synthesized through a traditional solid-state reaction route in air. Subsequently, the microstructure and luminescent performance of this red-emitting phosphor are discussed in detail. The crystal field strength ( Dq ) and the Racah parameters ( B and C ) are carefully calculated to estimate the nephelauxetic effect of Mn 4+ suffering from the CZG host lattice. In addition, the concentration quenching and thermal quenching characteristics are also systematically investigated. After incorporating CZG:Mn 4+ and commercial Y 3 Al 5 O 12 :Ce 3+ (Ce:YAG) phosphors into a blue LED device, warm white light with high color rendering index and low correlated color temperature is successfully achieved. Therefore, the CZG:Mn 4+ phosphor can serve as color converter for use in warm W-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
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 22
·6701-6710
·
IF 7
Fangyi Zhao,Yuhe Shao,Zhen Song,Quanlin Liu
Luminescence concentration quenching and thermal quenching are closely related to the energy transfer (ET) process between optically active ions. Herein, we utilize the structural confinement effect in Sr9Ga(PO4)7 (SGP) to selectively control ET pathways so as to suppress luminescence concentration and thermal quenching. In the Fe3+-doped SGP compound, the relatively large Fe3+–Fe3+ distances can inhibit the ET between Fe3+ ions, leading to weak concentration quenching. The Sr9Ga0.8(PO4)7:0.2Fe3+ (SGP:0.2Fe3+) phosphor exhibits the highest near-infrared (NIR) luminescence intensity, and the emission intensity for 50% and 100% Fe3+-doped SGP phosphors is 73.46% and 18.25% of that for the optimal sample SGP:0.2Fe3+, respectively. Upon co-doping Yb3+ into SGP:0.2Fe3+, Fe3+–Yb3+ distances are much shorter than those of Fe3+–Fe3+, causing energy to quickly migrate from the quenching center Fe3+ to the thermally stable center Yb3+. The thermal stability of SGP:0.2Fe3+,0.07Yb3+ is greatly enhanced compared to SGP:0.2Fe3+. This study provides a strategy for enhancing NIR luminescence through utilizing structural confinement to control ET pathways toward suppressing concentration and thermal quenching. Finally, we demonstrate the potential applications of SGP:0.2Fe3+ and SGP:0.2Fe3+,0.07Yb3+ phosphors in night vision and optical thermometry fields.
研究领域:
材料科学
·
光学材料
·
固体发光
·
无机非金属材料
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Na-Na Zhang,Hong-Yu Wang,Xue-Yuan Yan,Xu-Ping Wang,Bing Liu,Yuan-Yuan Zhang,Yu-Guo Yang
In this work, deep-red-emitting La 3 Ga 5 SiO 14 :Mn 4+ (LGS:Mn 4+ ) phosphors were successfully fabricated using high-temperature solid-state synthesis techniques, and a series of features were characterized. The phase and lattice information of the phosphors were determined through X-ray diffraction and Rietveld refinement. The microstructure and elemental characteristics were analyzed using scanning electron microscope. Infrared spectroscopy revealed the lattice vibration characteristics of the phosphors. The UV-visible absorption spectra demonstrated the absorption characteristics and band gap. Luminescence measurements showed that LGS:0.05 %Mn 4+ phosphors emit the bright deep-red light at 713 nm when excited at 365 nm, which originates from the 2 E g → 4 A 2g transitions of Mn 4+ ions. The optimum doping concentration for Mn 4+ is x = 0.25 mol% and the concentration quenching mechanism is attributed to dipole-dipole interactions. The lifetime of Mn 4+ ion decreases monotonically with the addition of Mn 4+ ions owing to the non-radiative transition effects. In addition, the prepared LGS:0.25 mol%Mn 4+ phosphors exhibit good thermostability, with an activation energy of 0.637 eV
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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