OPTIK
·
2022
·
IF 2.84
Ying Chen,Xuegang Zheng,Haobo Lin,Meijuan Liu,Shusheng Pan,Zhiyu Liu,Tong Liu,Dekang Xu,Hao Lin
In the work, a range of Er 3+ -sensitized NaYF 4 upconversion (UC) particles doped with Tm 3+ and Ho 3+ are successfully prepared by hydrothermal process. The UC crystals appear two green emission peaks at 529 and 541 nm and a remarkable red emission peak at 655 nm under 980 and 1532 nm irradiations. Here, Tm 3+ and Ho 3+ serve as trapping centers, which confine the excitation energy efficiently to promote the red UC emission and improve the red to green ratio. UC mechanisms in the Er 3+ /Tm 3+ co-doped and Er 3+ /Ho 3+ co-doped NaYF 4 crystals are discussed at length based on the UC luminescence spectroscopy. Unlike the traditional sensitization with high Er 3+ concentration doping to obtain red light, the red UC luminescence is acquired by low Er 3+ concentration doping, which can effectively avoid concentration quenching caused by high Er 3+ concentration doping. Furthermore, NaYF 4 :Er 3+ , Tm 3+ crystals exhibit stronger red UC emission compared with NaYF 4 :Er 3+ , Ho 3+ counterparts. Er 3+ -sensitized NaYF 4 crystals doped with Tm 3+ and Ho 3+ ions generate pure red light more efficaciously under 1532 nm excitation than under 980 nm excitation. The phosphors emitting brilliant red UC emission have the potential applications in solid state lasers and biological imaging.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 13
·6313-6320
·
IF 6.7
Wang Sheng,Jinshu Huang,Zhiyuan Cai,Li He,Bo Zhou
2 μm mid-infrared (MIR) light sources have shown great potential for broad applications in molecular spectroscopy, eye-safe lasers, biomedical systems and so on. However, previous research studies were mainly focused on conventional materials such as glasses, glass-ceramics and crystals, limiting the luminescence intensity and miniaturization of photonic devices. Here we report a new strategy to realize the multiple excitation wavelength responsive MIR emission in a single nanoparticle by employing an erbium sublattice as the sensitizing host. Intense 2 μm emission of Ho3+ from its 5I7 → 5I8 optical transition was observed under 808, 980 and 1530 nm excitations. The possible energy transfer mechanism between Er3+ and Ho3+ ions was discussed. We also designed a core–shell–shell nanostructure by inserting an NaYF4:Yb interlayer to maximize the absorption of 980 nm photons and enhance the 2 μm emission. The MIR luminescence under 808 nm excitation can be further improved by introducing Nd3+ into the outermost shell and attaching indocyanine green dyes. These results present an efficient way for the development of MIR luminescent nanomaterials with great potential in the fields of MIR gain devices, nanosized MIR light sources, and nanophotonics.
研究领域:
纳米光子学
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材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS TECHNOLOGY
·
2014
·
IF 0.746
D. Zhang,B. Zhang,X. N. Tang,Y. P. He,G. C. Gao,P. Jiang
A new inorganic antibacterial material was synthesised by the sol–gel method using copper ion as antibacterial ion, holmium nitrate as additive and white carbon black as carrier. The structure and properties of the inorganic antibacterial material were characterised by inductively coupled plasma atomic emission spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, X-ray diffraction (XRD) and antibacterial experiments (Escherichia coli as experimental bacteria). The result showed that the bacteriostasis rate of this new material was higher than that of the general Cu antibacterial white carbon black (without containing holmium); the bacteriostasis rate was over 90%. The form of the inorganic antibacterial material was investigated by XRD. The difference between the new inorganic antibacterial material and white carbon black was studied by FT-IR. Scanning electron microscopy and EDS were used to detect the holmium ion in the material.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Jingheng Nie,Bo Zhou,Shaofan Fang,Haizhe Zhong,Henan Li,Yumeng Shi
Inorganic lead-free halide perovskites with a broad-band emission of self-trapped excitons (STEs) have attracted great attention in lighting applications. However, it remains a fundamental challenge to expand the display color gamut because it is difficult to individually tune the emitting proportion at different wavelengths. Herein, we employ a doping route to incorporate Sb3+, Er3+, and Ho3+ ions into the Cs2NaInCl6, which enables multicolor emissions with narrow full width at half-maxima and high photoluminescence quantum yields (PLQYs). The blue emission (445 nm) originates from STEs in the [SbCl6]3– octahedrons, while the narrowband green (550 nm) and red (655 nm) emissions are mainly derived from the Er3+ and Ho3+ ions, respectively. An efficient energy transfer between multiple luminescent centers is the key point to achieve such an efficient and tunable emission. By controlling the lanthanide doping level, the emission color can be systematically modulated, and cold 10401 K (0.278, 0.286) to warm 4608 K (0.347, 0.298) adjustable white-light emission (PLQY of ∼70%) can be achieved successfully. The results provide inspiration for the material design of lead-free perovskites with efficient and tunable light-emitting properties for optoelectronic applications.
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 LUMINESCENCE
·
2023
·
IF 3.6
Chuncheng Zhang,Chaomin Zhang,Chao Yun
In this paper, Er 3+ /Ho 3+ co-doped fluoride glasses were prepared by the high temperature melt-quenching technique. Pumped by the 980 nm LD , as a result of the emission spectra overlapping of Er 3+ and Ho 3+ ions, a broadband mid-infrared emission band from 2530 to 2950 nm with a full width at half maximum of the synthetic fluoride glasses near 231 nm was obtained, which exist latent application in wide band tunable mid-infrared fiber laser. Furthermore, the intense 4.1 μm mid-infrared fluorescence (3600–4400 nm) was obtained and the FWHM was 320 nm. The up-conversion emission peaks around 525, 546 and 660 nm, near-infrared emissions at 1.2 and 1.5 μm together with mid-infrared fluorescence around 2.0 μm was observed in Er 3+ /Ho 3+ co-doped fluoride glass. Moreover, the relevant energy transfer processes were discussed in detail based on the emission spectrum and the energy level transition processes. The results indicate that the fabricated Er 3+ /Ho 3+ co-doped fluoride glasses exist prominent emission features for fiber laser gain medium.
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
·1-12
·
IF 5.418
Wang Linxuan,Li Liang,Yuan Maohui,Yang Zining,Han Kai,Wang Hongyan,Xu Xiaojun
Spectrally determination of temperature based on the lanthanide-doped nanocrystals (NCs) is a vital strategy to noninvasively measure the temperature in practical applications. Here, we synthesized a series of SrF 2 :Yb 3+ /Ho 3+ NCs and simultaneously observed the efficient visible upconversion luminescence (UCL) and near-infrared (NIR) downconversion luminescence (DCL) under 980, 940 and 915 nm excitations. Subsequently, these NCs were further utilized for thermometers based on the Boltzmann (thermally coupled levels, TCLs) and non-Boltzmann (non-thermally coupled levels, NTCLs) of Ho 3+ ions in the first (~ 650 nm), second (~ 1012 nm) and third (~ 2020 nm) biological windows (BW-I, BW-II and BW-III) under tri-wavelength excitations. The thermometric parameters including the relative sensitivity ( \(S_{{\text{r}}}\) ) and temperature uncertainty ( \(\delta T\) ) are quantitatively determined on the I 648 / I 541 (BW-I), I 1186 / I 1012 (BW-II), and I 1950 / I 2020 (BW-III) transitions of Ho 3+ ions in the temperature range of 303–573 K. Comparative experimental results demonstrated that the thermometer has superior performances.
研究领域:
生物医学
·
光学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Wenxia Wu,Yazhao Wang,Limin Wu,Huiting Zhang,Zhonghua Zhu,Shengdi Ta,Peng Zhang,Shoulei Xu,Bernard A. Goodman,Wen Deng
Under excitation at 980 nm, Tm3+ may emit ultraviolet, blue, and red light, and Ho3+ may emit green light through multiphoton upconversion processes in Yb/Tm/Ho codoped materials. However, because the probability of the electron population of the higher excited state energy levels is much lower than that of the lower ones in multiphoton upconversion processes, it is difficult to observe the ultraviolet emission of Tm3+-doped single crystals under excitation at 980 nm. Here, we report that high-quality single crystals of cubic ZrO2 codoped with Tm2O3, Ho2O3, and Yb2O3 are successfully grown by the optical floating zone method, and ultraviolet emission at 308 nm was observed for the first time from multiphoton upconversion transitions in these highly transparent, low phonon energy single crystals under excitation at 980 nm. This result demonstrates the prospect of making ultraviolet solid-state lasers pumped by near-infrared light. Moreover, bright white light was emitted from the single crystal prepared with 5.00 mol % Yb2O3, 0.75 mol % Tm2O3, 0.0075 mol % Ho2O3, 2.2425 mol % Y2O3, and 92.00 mol % ZrO2 under excitation at 980 nm, and a bright solid white light source excited by a near-infrared light-emitting diode for practical use is presented.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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