OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiang Meng,Jiajun Ma,Kang Xie,Liang Hong,Junxi Zhang,Zhijia Hu
We have demonstrated a low threshold and tunable flexible random laser (RL) in dye-doped poly ethylene glycol diacrylate (PEG-DA) hydrogel, which was prepared by crosslinking polymerization using PEG-DA monomer and photoinitiator. The random lasering is attributed to the light scattering from the porous structure of hydrogels, and the wavelength of random lasing can be tuned by ~3.2 nm in the temperature range from 30 °C to 70 °C. Under the continuous increasing and decreasing temperature cycle, the random lasing tunable phenomenon can still be observed, which proves that this flexible material can be used as a new temperature sensor . In addition, we also explored the application of flexible laser in phototherapy. Considering the good elasticity and transparency of hydrogels, this thermo-responsive property will be of great significance to the biomedical applications of flexible material.
研究领域:
生物医学工程
·
光学工程
·
高分子材料科学
·
光子学
·
生物传感器
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2016
·Vol. 4
·期 5
·798-806
·
IF 5.359
Enhai Song,Zitao Chen,Ming Wu,Sha Ding,Shi Ye,Shifeng Zhou,Qinyuan Zhang
In contrast to well-known multiple and fixed upconversion (UC) emission bands from lanthanide (Ln 3+ ) ions activated luminescent materials, room temperature wavelength-tunable single-band UC emissions are designed and demonstrated in Ln 3+ ions/transition metal Yb 3+ /Mn 2+ codoped fluoride perovskites ABF 3 (A = K + , Rb + , and Cs + ; B = Mg 2+ , Zn 2+ , and Cd 2+ ). Upon 976 nm laser excitation, the perovskites ABF 3 :Yb 3+ , Mn 2+ exhibit intense single band UC emission centered at 550–610 nm depending on the substitution of the A + and / or the B 2+ species in ABF 3 . Crystal structure and luminescent properties analysis show that the UC emission should originate from the transitions of super-exchange coupled Yb 3+ –Mn 2+ pair. The Stokes and UC emission properties, UC luminescence decay behaviors, as well as temperature dependent UC emission properties of ABF 3 :Yb 3+ , Mn 2+ are investigated and discussed in detail. The intense room (or high) temperature UC emission and ultralong UC decay lifetimes (≈25–45 ms) clearly reveal that the perovskites ABF 3 :Yb 3+ , Mn 2+ can be potentially applied in the fields of time-resolved luminescence imaging, lighting, and solid state lasers.
研究领域:
材料科学
·
光学材料
·
无机化学
·
光子学
·
固体物理
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2019
·
IF 1.337
Zhen Xiao,Jiawei Zhang,Jing Zhu,Hui Xu,Huanping Wang,Shiqing Xu,Yang Xia
Ho 3+ /Yb 3+ co-doped PbTiO 3 nanocrystals with different content of dopant were successfully prepared via a facile hydrothermal method. The purity, morphology, element distribution, chemical state and up-conversion (UC) photoluminescence (PL) of PbTiO 3 nanocrystals affected by Ho 3+ dopant are investigated systematically. X-ray diffraction (XRD) results illustrate that PbTiO 3 samples with the doping Ho 3+ concentration ranging from 0 to 5 mol-% are perovskite structure. The doping Ho 3+ ions have no change on the crystal structure of perovskite PbTiO 3 . Owing to the non-equivalent substitution of Ho 3+ to Ti 4+ in PbTiO 3 , the particle size of Ho 3+ /Yb 3+ co-doped PbTiO 3 samples is decreased as well as the particle agglomeration is detected. Moreover, Ho and Yb ions have uniform distributions in the PbTiO 3 nanoparticles as the presence of Ho 3+ and Yb 3+ cations. The up-conversion spectra demonstrate that Ho/Yb co-doped PbTiO 3 samples have up-conversion emissions centered at 550 nm, 660 nm and 755 nm, corresponding to the transitions of 5 F 4 ( 5 S 2 )→ 5 I 8 , 5 F 5 → 5 I 8 and 5 S 2 ( 5 F 4 )→ 5 I 7 of Ho 3+ ions. Additionally, the effect of temperature on the UC PL property of Ho 3+ /Yb 3+ co-doped PbTiO 3 system is further investigated. The sensitivity and the trend of Ho 3+ /Yb 3+ co-doped PbTiO 3 samples in temperature from 298 k to 493K are calculated on the basis of fluorescence intensity ratio (FIR) method. Ho 3+ /Yb 3+ co-doped PbTiO 3 nanocrystals are verified the high potential in the optical temperature sensing.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
光子学
·
功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiangqian Li,Jiapei Gu,Zhan Zhou,Lufang Ma,Yiping Tang,Jinwei Gao,Qianming Wang
The generation of novel optical sensing structures through the lanthanide coordination has been a key scientific endeavor. The design of molecular indicator for chemical response is derived from the assembly of a polymeric-based ternary europium (III) complex system (Eu(NTA) 3 L/PVA (NTA = 4,4,4-trifluoro-1-(naphthalen-2-yl)butane-1,3-dione, L = 2-(4-(4-(allyloxy)phenyl)-6-(pyridin-2-yl)pyridin-2-yl)pyridine, PVA = poly(vinyl acetate)). The electrospinning technique has been employed to create a nanometer scale membrane and this functional film with ultrafine fibers (diameter of about 110 nm) exhibits intense red light at 618 nm under ultra-violet excitation of 340 nm. The luminescent signal transduction involves the interaction of hydrogen chloride (HCl) with the organic ligand. The strong acidity of the analyte induces dissociation of complex network and the evolution of emission from red to blue has been observed. The fabricated nanosensor demonstrates rapid response time (<2 s) and the detection limit has been calculated to be 3.0 ppm. This effective strategy for achieving lanthanide complex-encapsulated polymer fibers will contribute to the development of new intelligent photonic devices.
研究领域:
材料化学
·
分析化学
·
纳米科技
·
光子学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2014
·
IF 1.716
J. Yuan,W.C. Wang,D.D. Chen,M.Y. Peng,Q.Y. Zhang,Z.H. Jiang
Enhanced 1.8 μm emission from Tm 3+ by Yb 3+ sensitization and bubbling in tungsten tellurite glasses has been demonstrated under the excitation of a 976 nm laser diode . Radiative properties such as spontaneous emission probabilities, radiative lifetimes and fluorescence branching ratios along with absorption and emission cross sections have been calculated from the absorption spectra . The influences of Yb 3+ concentration, Tm 3+ concentration, and bubbling time on spectroscopic properties have been thoroughly investigated. It is found that with increasing the bubbling time to 35 min, OH − content deceases sharply while 1.8 μm emission intensity improves greatly and 3 F 4 level lifetime prolongs to 1.57 ms close to radiative time. After 35 min, they change very little due to almost reaching the dynamic balance. The strength of interaction between Tm 3+ and OH − is determined. The energy transfer mechanism between Yb 3+ and Tm 3+ is proposed by photoemission spectroscopy and lifetime measurement. The energy transfer coefficients have been analyzed by the extended spectral overlap method and hopping model. Large ratio of the forward energy transfer from Yb 3+ to Tm 3+ to the backward one (223) and high energy transfer efficiency (97%) from Yb 3+ to Tm 3+ ensure efficient 1.8 μm emission. Hence, Yb 3+ sensitization and the reduction of OH − content could be expected to open up a possibility to achieve high efficient 2.0 μm lasing from Tm 3+ under a 976 nm LD pump.
研究领域:
光学材料
·
激光物理
·
固体激光器
·
光谱学
·
无机非金属材料
·
光子学
·
稀土发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
S.J. Huang,Y.B. Xiao,J.L. Liu,Y. Ji,L.Y. Mao,W.C. Wang
In this work, a multicomponent GeO 2 –Sb 2 O 3 –BaO (BSG) glass is explored to assess its potential for 1.06 μm fiber lasers . The glass-forming region of BSG system is predicted and determined experimentally based on a thermodynamic method. Benefitting from the incorporation of Sb 2 O 3 , this system possesses an exceptionally large glass-forming region, as well as high density and refractive index , wide infrared transmission range and low phonon energy. Furthermore, an efficient near-infrared emission at 1064 nm from Nd 3+ has been realized in this oxide glass with relatively long measured lifetime (200.58 ± 1.24 μs) and large emission cross-section (3.015 ± 0.090 × 10 −20 cm 2 ), indicating that Nd 3+ -doped BSG glass is a promising candidate for laser application in 1.06 μm region.
研究领域:
光学材料
·
玻璃科学
·
激光物理
·
无机非金属材料
·
光子学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 19
·12425-12430
·
IF 4.123
Yuxian Zhang,Weidong Zhao,Jiahui Wen,Jinming Li,Zhou Yang,Dong Wang,Hui Cao,Maohua Quan
A new type of electric- or thermal-responsive multilayer device composed of SiO2 bilayer inverse opal (IOP) and chiral nematic liquid crystals (N*LCs) was developed. Bilayer IOP was fabricated by layer-by-layer assembly of polystyrene (PS) spheres with two different sizes and showed a reflectance in an extended range of the near-infrared region. Furthermore, the electrically or thermally tunable reflectance of the bilayer-IOP–N*LC device was investigated. The device exhibited the photonic bandgap (PBG) of the N*LC–IOP composite structure with the application of an electric field (voltage-on), while it presented the reflectance of N*LCs without an electric field (voltage-off) and the electrically-responsive behaviour could be reversibly switched. Besides, the device exhibited a gradient redshift of reflectance as temperature increased below the clearing point (TC) while it showed the PBG of the N*LC–IOP composite structure when the temperature was above TC.
研究领域:
光子学
·
材料科学
·
液晶器件
·
光学材料
·
智能材料
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 16
·2102562
·
IF 10.05
Ping Chen,Dongyan Li,Zexin Li,Lejing Pi,Xiang Xu,Haoyun Wang,Xing Zhou,Tianyou Zhai
High-security encryption has always been important in economic and military fields as well as in daily life. 2D van der Waals (vdW) rare-earth (RE) materials have advantages in photoluminescence (PL) modulation to achieve high-security encryption because of their multiple sharp emission peaks, which will facilitate the multimode regulation for high-security encryption of programmable information. Here, programmable information encryption has been achieved by applying 2D vdW ErOCl via the editable electric-tunable PL. The correct information encoded in PL outputs can be tactfully decrypted from the PL intensity ratio of 2 H 11/2 – 4 I 15/2 and 4 S 3/2 – 4 I 15/2 transitions. This strategy for ASCII codes and images encryption with high-security is demonstrated. This novel approach, PL modulation of 2D vdW RE material based on programmable electric inputs, will mark a new path to achieve high-security encryption.
研究领域:
材料科学
·
光电子学
·
信息安全
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2015
·
IF 1.231
Peican Chen,Fuwang Mo,Anxiang Guan,Rongfang Wang,Guofang Wang,Siyu Xia,Liya Zhou
Bi 3+ /Tb 3+ , Eu 3+ co-doped Li 6 Gd(BO 3 ) 3 (LGBO) phosphors were synthesized via a traditional solid-state method. Phase purity was investigated using X-ray diffraction, absorption strength of the phosphors were investigated by UV–vis absorption spectra , and the photoluminescence properties of the phosphors were studied systematically. Results showed that the emission intensity of Bi 3+ , Eu 3+ co-doped LBOG was 2.76 times higher than that of Eu 3+ -doped LGBO irradiated at 275 nm, thereby implying the possibility of energy transfer from Bi 3+ to Eu 3+ . The excitation spectra of Tb 3+ , Eu 3+ co-doped LGBO phosphors are broader in comparison with single-doped phosphors and show tunable colors from green to yellow to orange-red when the ratio of Tb 3+ to Eu 3+ is adjusted These results demonstrate that LGBO:Tb 3+ , Eu 3+ phosphors have potential use in light-emitting diodes.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Haoyue Hao,Hongyu Lu,Guanghong Ao,Yinglin Song,Yuxiao Wang,Xueru Zhang
The nearly pure green and red emissions of Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 were realized by tri-doping Eu 3+ and Ce 3+ , respectively. The Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 powder, radiating intense green and red emissions, was prepared by a typical sol-gel method. Under the excitation of 980 nm laser, the red-to-green ratio was tuned from 0.2 to 4 as the concentration of Eu 3+ changed from 6 to 0 mol%, attributed to the energy transfer processes between Ho 3+ and Eu 3+ . Meanwhile, the red-to-green ratio altered from 4 to 20 as the concentration of Ce 3+ changed from 0 to 20 mol% via the cross relaxing processes between Ho 3+ and Ce 3+ . The prepared phosphors, possessing large tuning range of red-to-green ratio and resisting high temperature, can be potentially applied to colorful display and solid-state lighting.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态照明
·
显示技术
✓ 已验证
DOI
高影响因子
ACS Photonics
·
2018
·
IF 6.88
Fengren Cao,Wei Tian,Meng Wang,Liang Li
The hybrid organic–inorganic perovskites have been considered as promising candidates for high-performance photodetectors. However, how to fabricate self-powered broadband perovskite photodetectors with tunable photoresponse is still challenging. Herein, we design, for the first time, a ferroelectric semiconductor SrTiO3 (STO) and perovskite film hybrid structure based photodetector. After applying appropriate poled bias, the hybrid photodetector exhibits higher responsivity and faster response speed as compared to an unpoled device and a device without an STO ferroelectric interlayer. By optimizing the STO interlayer density, the positively poled photocurrent and response speed are enhanced to 0.956 mA and 0.1 s at zero bias, respectively. The corresponding responsivity is as high as 0.73A/W at a wavelength of 550 nm, which is much higher than that of the device without an STO interlayer. The improved performance is attributed to the fact that positively polarized STO layers can provide a built-in potential and promote the band bending at the semiconductor surface to facilitate the separation and transportation of the photogenerated charge carriers. Our work provides a promising route to design high-performance ferroelectric–perovskite photodetectors.
研究领域:
光电子学
·
材料科学
·
半导体器件
·
铁电材料
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Weichang Li,Jixi Xu,Qiang He,Yan Sun,Shiyu Sun,Wei Chen,Malgorzata Guzik,Georges Boulon,Lili Hu
The development of novel phosphors with stable and efficient green and red up-conversion (UC) emission is important for many applications such as fluorescent labeling , color display and anticounterfeiting. In this work, we report a stable and efficient green and red up-converter of LiYF 4 :Yb 3+ ,Ho 3+ octahedrons obtained by modified hydrothermal method . The UC emission and luminescence decays of LiYF 4 :Yb 3+ ,Ho 3+ with various Yb 3+ and Ho 3+ ion concentrations were studied systematically under 976 nm LD excitation. The Yb 3+ and Ho 3+ ion concentrations were optimized to be 20 mol% and 1 mol% respectively, for efficient green and red UC emissions. LiYF 4 :Yb 3+ ,Ho 3+ presents not only controlled morphology of monodisperse octahedrons with length of ∼20 μm and width of ∼10 μm, but also performs efficient green and red UC emissions, which is about four times stronger than that of β-NaGdF 4 : 20 Yb 3+ ,0.5Ho 3+ (NaGdF 4 : 20 Yb 3+ ,0.5Ho 3+ ). More importantly, the stable UC emission with variation of green intensity ratio ΔG% (G% = I 520-570nm /I 500-700nm , ΔG%= (G%) max -(G%) min ) and red intensity ratio ΔR% (R% = I 625-685nm /I 500-700nm , ΔR%= (R%) max -(R%) min ) < 1% was found over 976 nm LD excitation power density (PD) ranging from 1.0 to 5.6 W/cm 2 . Whereas, their variations of ∼6% and 25% are observed at the same excitation PD for NaGdF 4 :20 Yb 3+ ,0.5Ho 3+ and commercial β-NaYF 4 :20 Yb 3+ ,2Er 3+ (NaYF 4 : 20 Yb 3+ ,2Er 3+ ), respectively. The mechanism of green and red UC emissions in LiYF 4 : Yb 3+ ,Ho 3+ as a consequence of energy transfer processes has been briefly discussed taking into account the UC emission kinetics. The highly stable intensity ratio of G% and R% combined with the efficient green UC color hints the potential application of LiYF 4 : Yb 3+ ,Ho 3+ in fluorescent labeling and color display.
研究领域:
材料科学
·
光学材料
·
发光学
·
光子学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）