CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiuna Tian,Hongjian Dou,Lingyuan Wu
Based on the luminescence of Bi 3+ , novel temperature sensing materials YNbO 4 :Bi 3+ and YNbO 4 :Bi 3+ /Sm 3+ were successfully synthesized by solid state reaction. The XRD patterns show that the synthesized materials have a pure phase of YNbO 4 . With the excitation of 314 nm, the YNbO 4 :Bi 3+ material shows intense temperature-dependent luminescence in the range of 303 K–463 K. Based on the temperature-dependent luminescence of Bi 3+ in YNbO 4 , the maximum relative sensitivity can be obtained at 434 K (1.72% K −1 ). Under the excitation of 406 nm, the YNbO 4 :Sm 3+ material shows the characteristic emission peaks of Sm 3+ . In YNbO 4 :Bi 3+ /Sm 3+ phosphor, the large overlap between the emission spectra of Bi 3+ and the excitation spectra of Sm 3+ leads to a significant energy transfer from Bi 3+ to Sm 3+ . With the excitation of 314 nm, the emission spectra of YNbO 4 :Bi 3+ /Sm 3+ material shows the characteristic peaks of Bi 3+ and Sm 3+ . The luminescence intensity ratio of Sm 3+ and Bi 3+ shows a strong temperature dependence. Based on the luminescence intensity ratio, a large relative sensitivity is obtained at 455 K (1.57% K −1 ).
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
·
2018
·Vol. 29
·期 14
·11878-11885
·
IF 2.324
Ding Shoujun,Zhang Haotian,Liu Wenpeng,Sun Dunlu,Zhang Qingli
LnNbO 4 (Ln = Y, Gd and Lu) is a type of material that can be used as both outstanding self-activated phosphor and laser host has generated significant interests. However, their electronic structures and optical properties still require elucidation. To solve this intriguing problem, firstly, YNbO 4 and LuNbO 4 polycrystalline with monoclinic crystal structure were prepared by traditional high-temperature solid-state reaction method and their structure and luminescent properties were characterized in experiment. Additionally, their CIE chromaticity coordinate were presented to illustrate the luminescent color and the chromaticity coordinates for YNbO 4 and LuNbO 4 are x = 0.1581, y = 0.0725 and x = 0.1581, y = 0.0753, respectively. Secondly, systematic theoretical calculations based on density functional theory method were carried out on them and their band structures, density of states as well as optical properties were obtained in theoretical. The calculated band gap for YNbO 4 and LuNbO 4 are 4.101 and 4.214 eV, respectively. Lastly, a comparison between the experimental and calculated band gap and refractive index was conducted. The good coincident between them indicating the calculated results are reliable. Therefore, all of the obtained results could provide an essential understanding of LnNbO 4 materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yuanyuan Tian,Yue Tian,Ping Huang,Lei Wang,Qiufeng Shi,Cai’e Cui
Yb 3+ /Er 3+ co-doped YNbO 4 nanoparticles (NPs) with an average size of 35 nm were prepared via modified molten salt method for the first time. The phase purity, crystal structure, morphologies, and upconversion luminescence (UCL) properties as well as quantum yield and temperature sensing behavior of the as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and upconversion luminescence (UCL) spectra, respectively. The XRD Rietveld refinements based on the XRD data were employed to reveal the phase purity and structure of the as-prepared samples. It was confirmed that the optimal doping concentration of Yb 3+ ions in YNbO 4 :Yb 3+ , Er 3+ NPs is around 10 mol%, which has a maximal quantum yield of 0.1%. The temperature sensing behavior of the as-prepared YNbO 4 :Yb 3+ , Er 3+ NPs was studied based on the fluorescent intensity ratio (FIR) technique from two thermal coupled 2 H 11/2 and 4 S 3/2 levels. It was found that the temperature sensitivity was sensitive to the doping concentration of Yb 3+ ions. In addition, the dependence of UCL colors on temperature was observed and the corresponding mechanism was proposed. Therefore, the as-prepared Yb 3+ /Er 3+ co-doped YNbO 4 NPs have double function of optical thermometer and safety sign for the high temperature environment.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science Letters
·
2012
·Vol. 10
·期 1
·274-278
·
IF 0
Liu Chenglu,Wang Fang,Zhou Zhiqiang,Jia Peiyun
YNbO4:Eu nano-phosphors were successfully prepared in NaNO3 molten salt. X-ray diffraction was used to characterize the structure of the samples. The results indicate that a suitable amount of NaOH in NaNO3 molten salt can effectively improve the crystallinity
of the samples annealed at same temperature; meanwhile, the elevation of annealing temperature increases the crystallinity, and transfers the crystalline phase from scheelite to fergusonite. The micrographs of transmission electron microscopy reveal that the grain size increases with the elevation
of annealing temperature. Upon excitation into the niobate groups at 260 nm, YNbO4:Eu nano-phosphors exhibit weak emission at 405 nm, originated from Nb–O charge transfer transition and the characteristic emission of Eu3+, which indicates there is an energy transfer
from niobate group to Eu3+. Monitored by emission of 615 nm, the excitation spectrum shows that the f-f transition of 7F0–5L6 at 396 nm is more intense than the Nb–O charge transfer band at 260 nm. This intense absorption at
396 nm make YNbO4:Eu nano-phosphors an excellent candidate of white light emitting diode.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Aihua Zhou,Xiaohong Wang,Chengguo Ming,Yumiao Pei
At present, many researchers are focusing on Er 3+ ions doped thermally enhanced upconversion luminescent materials. However, the anti-thermal-quenching downshifting emissions of the activator in a phosphor have not yet been studied in sufficient depth. Herein, Eu 3+ /Er 3+ co-doped YNbO 4 phosphors prepared are explored for selectively enhanced red emission (Eu 3+ : 5 D 0 → 7 F 2 and 5 D 0 → 7 F 4 ) due to the defect-mediated thermal enhancement of emission by thermal compensation mechanism. Moreover, the coexistence of intrinsic luminescence centers ([NbO 4 ] 3- ), Er 3+ and Eu 3+ ions enables tunable emission color shifting from red to green and red under excitation at 250 nm, 379 nm, and 395 nm, respectively. This multi-wavelength excitation approach ensures the material's application in anti-counterfeiting. Based on the different thermal response of [NbO 4 ] 3- and Eu 3+ ions, an optical temperature sensing is achieved. The relative sensitivity of YNbO 4 :2%Eu 3+ /8%Er 3+ sample could reach 2.466% K −1 at 323 K. The above results indicate that the sample is a promising candidate for multi-functional applications.
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 34
·2401688
·
IF 8
Yuqi Chen,Fangyi Zhao,Kangrui Qiang,Qinan Mao,Heyi Yang,Yiwen Zhu,Meijiao Liu,Jiasong Zhong
Phosphors with multifunctional applications have attracted extensive research, especially in thermometer and anti-counterfeiting fields. Herein, a series of Pr 3+ -doped YNbO 4 (YNO) phosphors with adjustable photoluminescence and red persistent luminescence (PersL) performances are developed. YNO host exhibits the blue self-activated luminescence, and the different Pr 3+ emission peaks possess various thermal stability properties due to the thermal quenching channel generated by the intervalence charge transfer state between Pr 3+ and Nb 5+ ions. Two kinds of fluorescence intensity ratio models with high absolute and relative sensitivities are realized to measure the temperature under dual-wavelength excitation. Moreover, YNO:Pr 3+ exhibits the red PersL with a duration of about 120 s upon ceasing the UV excitation light source. The fabricated YNO:Pr 3+ -polydimethylsiloxane films display different luminescence patterns with the passage of time after turning off UV light, which can cleverly achieve dynamic conversion. These results demonstrate that YNO:Pr 3+ phosphor has potential applications in dual-wavelength excited thermometry and dynamic anti-counterfeiting fields.
研究领域:
材料科学
·
光学传感
·
防伪技术
·
发光材料
·
测温技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yuxuan Luo,Danyu Zhang,Shujun Xu,Lianjie Li,Liping Chen,Hai Guo
Herein, YNbO 4 (YNO):Bi 3+ ,Ln 3+ (Ln = Dy, Eu) phosphors were manufactured though high-temperature solid-phase reaction. Their structural properties, optical characteristics and energy transfer mechanisms (Bi 3+ →Ln 3+ ) were analyzed in detail, and their potential application in optical thermometry was explored. Under 312 nm excitation, YNO:Bi 3+ ,Ln 3+ phosphors show broad emission from Bi 3+ ions ( 3 P 1 → 1 S 0 ) and sharp peaks from 4f-4f transitions of Ln 3+ ions. YNO:Bi 3+ ,Ln 3+ samples exhibit high sensitivity and superior thermochromic properties in temperature sensing. For YNO:Bi 3+ ,Dy 3+ phosphor, the maximum absolute sensitivity ( S a ) and relative sensitivity ( S r ) reach 14.25 %K −1 (573 K) and 1.48 %K −1 (444 K), respectively. For YNO:Bi 3+ ,Eu 3+ phosphor, the maximum S a and S r reach 38.21 %K −1 (573 K) and 1.58 %K −1 (445 K), respectively. And the chromaticity shift of emission from YNO:Bi 3+ ,Eu 3+ phosphor is 0.38 for temperature from 303 to 573 K. Such results suggest that YNO:Bi 3+ ,Ln 3+ phosphors can be candidate for visual and highly sensitive optical thermometry.
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 ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yuyan Deng,Yulong Hao,Shuo Feng,Xiahong Lin,Zhenglin Sun,Haiqin Sun,Qiwei Zhang
Photochromic materials have attracted considerable attention owing to their promising applications in smart displays and optical information storage. However, most photochromic materials still face challenges, such as limited coloration and low photochromic efficiency, which restrict their potential applications in multicolor displays and high-quality optical storage. In this study, Co ions were selected as a coloring agent, and introduced into YNbO 4 matrix, showing high efficient photochromism and chemical coloration properties. Under 265 nm irradiation, the photochromic efficiency increases from 45.6% (x = 0) to 71.5% (x = 0.003), while the luminescence modulation ratio rises from 33.6% to 72.2%, thereby substantially improving optical storage capability. Most importantly, Co doping expands the surface color range from pale yellow (x = 0) to green (x = 0.001) or blue (x ≥ 0.003), and the photochromic coloration changes from brown (x = 0) to dark grey (x ≥ 0.001) after 265 nm irradiation, realizing multicolor chromism. Such multicolor features rely on synergistic coupling of photochromic and chemical coloration. These results highlight the great potential of the YNbO 4 :xCo system for multicolor display and optical storage, and provide valuable insights for future design of multicolor photochromic materials.
✓ 已验证
DOI
高影响因子
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