INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xiangping Li,Zhipeng Guan,Ziru Liu,Rensheng Shen,Yan Li,Runpu Zhou,Hongquan Yu,Lei Li,Baojiu Chen
In this work, the nitriding method was used to improve the up-conversion (UC) luminescence intensity and temperature sensing sensitivity of phosphor materials. Yb 3 Al 5 O 12 : Er 3+ and partially nitrided Yb 3 Al 5 O 12-1.50 x N x : Er 3+ phosphors by using AlN as nitrogen source were prepared via solid-state reaction method. The influence of nitridation on the UC luminescence and temperature sensing properties of Yb 3 Al 5 O 12 : Er 3+ phosphors upon 980 nm excitation were discussed. Almost pure red UC emission was obtained, and the intensity of the red UC emission of the samples was enhanced by 25 % after nitridation. Meanwhile, the absolute temperature sensitivity respectively derived from the intensity ratios of the green and red emissions increased by 5 % and 50 % after nitridation. Judd-Ofelt theory was utilized to analyze the change of the crystal field environment around Er 3+ and confirmed that the introduction of N 3– reduced the symmetry around Er 3+ and strengthened the covalence between Er 3+ and ligands, which may result in the enhancement of UC emission intensity and temperature sensing sensitivity. The experiment proved that Yb 3 Al 5 O 12 : Er 3+ red UC phosphors had potential application in luminescence imaging and temperature sensors.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3722-3725
·
IF 1.339
Song Weiye,Guo Xingyuan,He Guanghui,Qin Weiping
β-NaLuF4:20%Yb,0.5%Tm,x%Gd (x = 10,20, 30) nanocrystals were synthesized by high temperature thermal decomposition method. X-ray diffraction (XRD) show the as-prepared samples are characteristic of a pure β-NaLuF4. Transmission
electron microscope (TEM) investigations indicate the nanocrystals have particle size of ∼85 nm with good monodispersity and well-defined crystallographic facets. Particularly, under 980 nm excitation, upconversion (UC) emissions in the UV range of 270–320 nm were observed in these
nanocrystals, which further prove that β-NaLuF4 is an excellent host for building UV compact solid-state lasers or fiber lasers.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 10
·2767
·
IF 5.076
Yu Liu,Ziwen Zhou,Shaojian Zhang,Enming Zhao,Jing Ren,Lu Liu,Jianzhong Zhang
To date, the mechanisms of Er3+upconversion luminescence via 980 and 1530 nm excitation have been extensively investigated; however, based on discussions, they either suffer from the lack of convincing evidence or require elaborated and time-consuming numerical simulations. In this work, the steady-state and time-resolved upconversion luminescence data of Er3+-doped NaYF4were measured; we therefore investigated the upconversion mechanisms of Er3+on the basis of the spectroscopic observations and the simplified rate equation modeling. This work provides a relatively simple strategy to reveal the UCL mechanisms of Er3+upon excitation with various wavelengths, which may also be used in other lanthanide ion-doped systems.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Pengfei Shuai,Libing Liao,Qingfeng Guo,Dan Yang,Ruiqi Shi,Lefu Mei
Cryolite was considered to be an ideal up-conversion host material due to its low phonon energy, which can effectively suppress the radiation-free transition process of excited state energy levels. In the present paper, a novel up-conversion material K 3 YF 6 :Ho 3+ , Yb 3+ with cryolite structure was prepared successfully using a high-temperature solid state method. The up-conversion luminescence properties of K 3 YF 6 doped with different Ho 3+ /Yb 3+ doping ratio were investigated and the optimal doping ratio were confirmed in this system. Under 980 nm excitation, Ho 3+ /Yb 3+ co-doped K 3 YF 6 revealed a strong green emission at the 541 nm, 549 nm and a weak red emission peaking at 666 nm, corresponding to the 5 F 4 , 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions of Ho 3+ , respectively. All the red and green up-conversion emission of K 3 YF 6 :Ho 3+ , Yb 3+ belong to two-photon process and energy transfer from Yb 3+ to Ho 3+ simultaneously. Additionally, to understand the energy transfer and electronic transition process of the red and green light emitted, the possible luminescence mechanism were also analyzed in this paper. All the results indicate that Ho 3+ /Yb 3+ co-doped K 3 YF 6 have potential application value in green up-conversion luminescent materials.
研究领域:
材料科学
·
光学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Yuzhen Wang,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
With the rapid development of science and technology, the high-security-level anti-counterfeiting technique is essential for ensuring property or information security. In this work, we prepared micron NaYTiO 4 : Bi/Er (NYT: Bi/Er) phosphors with integrating up-conversion (UC) photoluminescence, down-shifting (DS) emission, phosphorescence and photochromism (PC) performances for advanced multiple anti-counterfeiting application. Owing to the abundant energy levels of Er 3+ ions, the UC and DS luminescence behaviors are anticipated. Specifically, the yellow-green emission of Er 3+ ions can be observed upon 980 nm excitation, and the bright green emission is demonstrated under 281 or 254 nm excitation due to the energy transitions of Er 3+ ions and the energy transfer process from Bi 3+ to Er 3+ ions. Besides, the introduction of Bi 3+ ions generates defect levels in the matrix and thus leads to phosphorescence. Furthermore, the repeatable PC performance could be triggered by the 365 nm irradiation and vanished with 450 nm illumination or thermal stimulation. To verify the practical usability of NYT: Bi/Er phosphors on anti-counterfeiting applications, some experiments are designed and successfully executed. It is believed that the NYT: Bi/Er phosphors can be a promising candidate for high-security-level multiple anti-counterfeiting.
研究领域:
材料科学
·
光学材料
·
安全技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2018
·
IF 13.709
Jing Zuo,Langping Tu,Qiqing Li,Yansong Feng,Ivo Que,Youlin Zhang,Xiaomin Liu,Bin Xue,Luis J. Cruz,Yulei Chang,Hong Zhang,Xianggui Kong
Photoswitchable materials are important in broad applications. Recently appeared inorganic photoswitchable upconversion nanoparticles (PUCNPs) become a competitive candidate to surmount the widespread issue of the organic counterparts —photobleaching. However, current PUCNPs follow solely Yb3+/Nd3+ cosensitizing mode, which results in complex multilayer doping patterns and imperfectness of switching in UV–blue region. In this work, we have adopted a new strategy to construct Nd3+ free PUCNPs—NaErF4@NaYF4@NaYbF4:0.5%Tm@NaYF4. These PUCNPs demonstrate the superior property of photoswitching. A prominent UV–blue emission from Tm3+ is turned on upon 980 nm excitation, which can be completely turned off by 800 nm light. The quasi-monochromatic red upconversion emission upon 800 nm excitation—a distinct feature of undoping NaErF4 upconversion system—endows the PUCNPs with promising image-guided photoinduced “off–on” therapy in biomedicine. As a proof-of-concept we have demonstrated the imaging-guided photodynamic therapy (PDT) of cancer, where 800 nm excitation turns off the UV–blue emission and leaves the emission at 660 nm for imaging. Once the tumor site is targeted, excitation switching to 980 nm results in UV–blue emission and the red emission. The former is used to induce PDT, whereas the latter is to monitor the therapeutic process. Our study implies that this upconversion photoswitching material is suitable for real-time imaging and image-guided therapy under temporal and spatial control.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
诊疗学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）