Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
·
IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2012
·
IF 11.421
Yunlu Dai,Ping’an Ma,Ziyong Cheng,Xiaojiao Kang,Xiao Zhang,Zhiyao Hou,Chunxia Li,Dongmei Yang,Xuefeng Zhai,Jun Lin
In this study, we report a new controlled release system based on up-conversion luminescent microspheres of NaYF4:Yb3+/Er3+ coated with the smart hydrogel poly[(N-isopropylacrylamide)-co-(methacrylic acid)] (P(NIPAM-co-MAA)) (prepared using 5 mol % of MAA) shell. The hybrid microspheres show bright up-conversion fluorescence under 980 nm laser excitation, and turbidity measurements show that the low critical solution temperature of the polymer shell is thermo- and pH-dependent. We have exploited the hybrid microspheres as carriers for Doxorubicin hydrochloride (DOX) due to its stimuli-responsive property as well as good biocompatibility via MTT assay. It is found that the drug release behavior is pH-triggered thermally sensitive. Changing the pH to mildly acidic condition at physiological temperature deforms the structure of the shell, causing the release of a large number of DOX from the microspheres. The drug-loaded microspheres exhibit an obvious cytotoxic effect on SKOV3 ovarian cancer cells. The endocytosis process of drug-loaded microspheres is observed using confocal laser scanning microscopy and up-conversion luminescence microscopy. Meanwhile, the as-prepared NaYF4:Yb3+/Er3+@SiO2@P(NIPAM-co-MAA) microspheres can be used as a luminescent probe for cell imaging. In addition, the extent of drug release can be monitored by the change of up-conversion emission intensity. These pH-induced thermally controlled drug release systems have potential to be used for in vivo bioimaging and cancer therapy by the pH of the microenvironment changing from 7.4 (normal physiological environment) to acidic microenvironments (such as endosome and lysosome compartments) owing to endocytosis.
研究领域:
生物材料
·
纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Yannan Qian,Xunze Tang,ZhengYu Zhang,Haiyan Zhang,Maxim Ivanov,Qibai Wu
A novel multicolor-tunable lanthanide doped 12CaO·7Al 2 O 3 (Ln 3+ :C12A7; Ln 3+ = Yb 3+ , Tm 3+ and Er 3+ ) synthesized by solid-state reaction method would greatly enhance the scope of its applications ranging from infrared solar cells to field emission display . The scanning electron microscopy (SEM) was used to characterize the morphology of Ln 3+ :C12A7. Under 980 nm excitation, the emission color was tuned from green-yellow to red region through adjusting the concentrations of Ln 3+ ions. The obtained near infrared upconversion (UC) emissions in Ln 3+ :C12A7 was corresponded to “window of optical transparency”. All blue, green and red UC emissions were populated by one-photon process, and the proposed UC mechanisms were studied in Ln 3+ :C12A7.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 20
·3432-3438
·
IF 3.117
Pengpeng Lei,Ran An,Chengyu Li,Jing Feng,Hongjie Zhang
Bismuth-based nanoparticles, particularly NaBiF4, have attracted extensive attention as hosts for lanthanides (Ln3+) ions and other luminescent ions in recent years. However, the controllable synthesis of NaBiF4 nanoparticles remains a challenge. Herein, different concentrations of Gd3+ ion-doped NaBiF4:Yb3+/Er3+ upconversion nanoparticles (UCNPs) have been successfully synthesized via a facile solvothermal method. By changing the doping levels of Gd3+ ions (0–20%), the size of NaBiF4:Yb3+/Er3+ UCNPs can be easily tuned from 200 nm to 50 nm, but the nanoparticles always maintained the hexagonal phase structure. Under 980 nm excitation, the as-synthesized NaBiF4:Yb3+/Er3+/20%Gd3+ UCNPs showed desirable luminescent properties. Furthermore, the 980 nm excited luminescence temperature-sensing behavior of NaBiF4:Yb3+/Er3+/20%Gd3+ UCNPs was achieved in a wide temperature range from 148 K to 498 K. These results provide strong evidence for the controllable synthesis of NaBiF4 UCNPs and their application in ratiometric temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-10
·
IF 3.159
Yuan Maohui,Wang Rui,Zhang Chaofan,Yang Zining,Yang Xu,Han Kai,Ye Jingfeng,Wang Hongyan,Xu Xiaojun
The presence of manganese ions (Mn 2+ ) in Yb/Er-co-doped nanomaterials results in suppressing green (545 nm) and enhancing red (650 nm) upconversion (UC) emission, which can achieve single-red-band emission to enable applications in bioimaging and drug delivery. Here, we revisit the tunable multicolor UC emission in a single Mn 2+ -doped β-NaYF 4 :Yb/Er microcrystal which is synthesized by a simple one-pot hydrothermal method. Excited by a 980 nm continuous wave (CW) laser, the color of the single β-NaYF 4 :Yb/Er/Mn microrod can be tuned from green to red as the doping Mn 2+ ions increase from 0 to 30 mol%. Notably, under a relatively high excitation intensity, a newly emerged emission band at 560 nm ( 2 H 9/2 → 4 I 13/2 ) becomes significant and further exceeds the traditional green (545 nm) emission. Therefore, the red-to-green (R/G) emission intensity ratio is subdivided into traditional (650 to 545 nm) and new (650 to 560 nm) R/G ones. As the doped Mn 2+ ions increase, these two R/G ratios are in lockstep with the same tunable trends at low excitation intensity, but the tunable regions become different at high excitation intensity. Moreover, we demonstrate that the energy transfer (ET) between Mn 2+ and Er 3+ contributes to the adjustment of R/G ratio and leads to tunable multicolor of the single microrod. The spectroscopic properties and tunable color from the single microrod can be potentially utilized in color display and micro-optoelectronic devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2014
·Vol. 4
·期 6
·1186-1196
·
IF 2.923
E. H. Song,S. Ding,M. Wu,S. Ye,Z. T. Chen,Y. Y. Ma,Q. Y. Zhang
Tunable broadband white upconversion (UC) luminescence has been demonstrated in Yb3+/Tm3+/Mn2+ tri-doped KZnF3 nanocrystals from the excitation of a 976 nm laser diode (LD). The white light is composed of three sharp band peaks at 480, 650 and 700 nm, originating from the UC emissions of Tm3+ ions, and one broad band centered at 585 nm, originating from exchange-coupled Yb3+–Mn2+ dimers. The effects of the concentration, pump power and temperature on the UC luminescence properties of KZnF3:Yb3+,Tm3+,Mn2+ nanocrystals have been investigated. By changing the Mn2+/Tm3+ content ratio, various colors of the UC luminescence can be easily obtained in KZnF3:Yb3+,Tm3+,Mn2+ nanocrystals, which gives these nanocrystals potential applications in the fields of lighting, displays and 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 Materials Chemistry C
·
2016
·Vol. 4
·期 42
·10154-10160
·
IF 5.066
J. L. Wang,E. H. Song,M. Wu,W. B. Dai,X. F. Jiang,B. Zhou,Q. Y. Zhang
Room-temperature green to orange color-tunable upconversion (UC) luminescence has been achieved from Yb3+/Mn2+ co-doped CaO by adjusting the doping concentration of Mn2+ ions and the temperature of the samples upon 980 nm laser diode excitation. In this material system, the green UC emission band centered at 508 nm and the wavelength-tunable orange UC emission band from 560 to 725 nm are realized at 980 nm excitation, which originate from the cooperative luminescence of Yb3+ pairs and the |2F7/2, 4T1(4G)〉 → |2F7/2, 6A1(S)〉 transition of exchange-coupled Yb3+–Mn2+ dimers, respectively. The characteristic Stokes and UC emission properties, UC luminescence decay behaviors, temperature-dependent UC emission properties, as well as the involved UC mechanism of CaO:Yb3+,Mn2+ are investigated and discussed in detail. This study offers a new method to design novel UC materials for lighting and display applications instead of using conventionally investigated lanthanide (Ln3+) ions, such as Er3+, Tm3+ and Ho3+.
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
·
2015
·
IF 2.605
Yurun Ma,Pingsun Qiu,Dongfang Xu,Jinrong Lin,Yanxue Tang,Feifei Wang,Xiyun He,Ziyao Zhou,Nianxiang Sun,Xinyang Zhang,Yi Zhou,Dazhi Sun
NaYF 4 nanorods , and nanoparticles co-doping with Yb 3+ and Er 3+ were synthesized by hydrothermal method . The effects of doped ion concentration, the ratio of NaF to Ln (NO 3 ) 3 and the reactant content on the luminescence properties of the nanocrystals were investigated in detail in this paper. The materials were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and photoluminescence (PL) spectra. The results indicate that a doping level of 20 mol% Yb 3+ and 2 mol% Er 3+ gives the strongest luminescence, and concentration quenching occurs, when Er 3+ concentration exceeds 5 mol%. Besides, the reaction of temperature and time were also investigated and the results showed that they have an effect on the shape, size, and crystal phase purity of the nanoparticles . The luminescence mechanism for the NaYF 4 :Yb 3+ , Er 3+ was discussed. Under 980 nm excitation, the Er 3+ ions doped into NaYF 4 samples emitted green fluorescence 520 nm ( 4 H 11/2 → 4 H 15/2 ), 550 nm ( 4 S 3/2 → 4 H 15/2 ) and red fluorescence 650 nm( 4 F 9/2 → 4 I 15/2 ), which were modified and enhanced by Yb 3+ ions.
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 ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoli Luo,Wu Zhao,Qichen Chen,Mingfeng Zhi
As a matrix material, NaYbF 4 has attracted more and more attention due to its large absorption cross section and high energy transfer efficiency. In this study, lanthanide doped NaYbF 4 upconversion (UC) nano-/micro-crystalline was carefully synthesized by hydrothermal method . The influence of kinds of external conditions, including reaction time, initial reaction solution pH value, organic solvents codoping, and Na + concentration on crystalline phase, size, morphology and especially luminescent property are systematically studied and the possible formation mechanism based on PH values is emphatically proposed. The products of NaYbF 4 with various morphologies range from nanospheres , microprisms, microdisks, hexagonal crown-capped shapes, hexagonal clam-like shapes and hexagonal flower-like shapes were successfully prepared. The results show that the up-conversion luminescence property is positively correlated with the slenderness ratio. Solvents codoping and Na + concentration can greatly improve the luminescence property, especially for red emission. Impressively, the emission colors and intensities might be finely tuned through finely tuning the PH values, solvents co-doping and Na + dosage. Furthermore, this study will be expected to contribute to the synthesis of various morphologies and improving the UC intensity of lanthanide doped crystals.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-8
·
IF 5.418
Yuan Maohui,Yang Zining,Yang Xu,Wang Linxuan,Wang Rui,Lan Sheng,Han Kai,Wang Hongyan,Xu Xiaojun
Controlling the upconversion luminescence (UCL) intensity ratio, especially pumped at 808 nm, is of fundamental importance in biological applications due to the water molecules exhibiting low absorption at this excitation wavelength. In this work, a series of β-NaYbF 4 :Er microrods were synthesized by a simple one-pot hydrothermal method and their intense green (545 nm) and red (650 nm) UCL were experimentally investigated based on the single-particle level under the excitation of 808 nm continuous-wave (CW) laser. Interestingly, the competition between the green and red UCL can be observed in highly Yb 3+ -doped microcrystals as the excitation intensity gradually increases, which leads to the UCL color changing from green to orange. However, the microcrystals doped with low Yb 3+ concentration keep green color which is independent of the excitation power. Further investigations demonstrate that the cross-relaxation (CR) processes between Yb 3+ and Er 3+ ions result in the UCL competition. Graphical Abstract
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2494-2504
·
IF 6.4
Xinxu Li,Bingting Bao,Xinyu He,Guoqiang Wang,Yantang Huang,Lingyun Li,Yan Yu
Optical temperature sensing technology, especially the fluorescence intensity ratio (FIR) type sensor based on Er3+, Yb3+ co-doped up-conversion (UC) luminescent materials, presents numerous opportunities in the field of temperature detection. Various Er3+, Yb3+ co-doped fluorides and oxides have been explored for the application of temperature sensing. Most of these Er3+, Yb3+ co-doped sensing materials are phosphors, for which the high temperature phase and chemical stability is still challenging. The Er3+, Yb3+ co-doped oxide single crystal is a promising solution to explore temperature sensing materials with practical application ability. In this work, an Er3+, Yb3+ co-doped LaBMoO6 single crystal (LBMO-SC: Er3+, Yb3+) is grown through flux assisted spontaneous crystal growth technology. Compared with the Er3+, Yb3+ co-doped LaBMoO6 polycrystalline samples (LBMO-PC: Er3+, Yb3+), the LBMO-SC: Er3+, Yb3+ shows improved UC performance with enhanced light emission and prolonged luminescence lifetime. The UC performance improvement results from the more efficient energy transfer between Yb3+ and Er3+. The energy transfer efficiency from Yb3+ to Er3+ in the LBMO-PC: Er3+, Yb3+ powders sintered at 1000 °C for 15 h is 7.3%, while it is 29.7% in the LBMO-SC: Er3+, Yb3+. The strong UC luminescence of LBMO-SC: Er3+, Yb3+ extends the temperature detection range; the luminescence of 4S3/2 → 4I15/2 in LBMO-SC: Er3+, Yb3+ is still measurable even when the temperature reaches 570 K. The LBMO-SC: Er3+, Yb3+ has a maximum value of relative temperature sensitivity of 1.16% K−1 at 300 K. Finally, an optical fiber type temperature sensor with practical application capability is successfully fabricated by using LBMO-SC: Er3+, Yb3+ as the luminescence sensing medium.
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
·
2023
·
IF 5.2
Hang Liu,Ziyi Zhang,Jian Liu,Kailin Wang,Yuhong Zhang
In this paper, the upconversion(UC) and downshifting(DS) luminescence and thermal sensing performances of the CaIn 2 O 4: RE 3+ /Tm 3+ /Yb 3+ (RE=Er, Ho) phosphors are investigated in detail. The bright UC emission bands from 450 to 900 nm and the DS luminescence bands from 1000 to 1700 nm are obtained under 980 nm excitation. The typical near infrared(NIR) emisson band(∼1550 nm) of Er 3+ ions and the NIR emission band(∼1200 nm) of Ho 3+ ions are gained. The temperature sensing features of CaIn 2 O 4: RE 3+ /Tm 3+ /Yb 3+ (RE=Er, Ho) phosphors are investigated with the luminescence intensity ratio (LIR) technique. The results indicate that the maximum relative sensitivity (S Rmax ) of CaIn 2 O 4: Er 3+ /Tm 3+ /Yb 3+ sample reaches 1.576% K -1 at 313 K, and the S Rmax of CaIn 2 O 4: Ho 3+ /Tm 3+ /Yb 3+ sample reaches 0.797% K -1 at 353 K in UC range. In addition, the higher temperature measuring sensitivities have been obtained in NIR-II region with the DS luminescence of CaIn 2 O 4: RE 3+ /Tm 3+ /Yb 3+ phosphors. The above results indicate that the CaIn 2 O 4: RE 3+ /Tm 3+ /Yb 3+ phosphors show bright emission bands in visible and NIR-II, and higher sensitivity for temperature measurement. The CaIn 2 O 4: RE 3+ /Tm 3+ /Yb 3+ phosphors present great application in optical temperature measurement.
研究领域:
材料科学
·
光学
✓ 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）