Advanced Optical Materials
·
2022
·Vol. 10
·期 21
·2201182
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IF 10.05
Keming Zhu,Zhiying Wang,Hanyu Xu,Zuoling Fu
Lead halide perovskites have been very promising for versatile optoelectronic applications, whereas the inherent toxicity and instability of lead halide restrict its wide application. Herein, a kind of high-performance multifunctional phosphor is designed based on heavy concentration Er 3+ -activated lead-free double perovskite Cs 2 NaBiCl 6 (CNBC), which realizes the self-sensitization of Er 3+ ions and emits high-brightness pure green emission upon dual near-infrared (dual-NIR) excitation. The luminescence properties can be further optimized by adding sensitizers (Yb 3+ /Nd 3+ ). Interestingly, the emission intensity of the green region is heightened by 212-fold after Yb 3+ ions doping, which is 40 times higher than that of the current popular phosphors (α-NaYF 4 :2%Er 3+ ,18%Yb 3+ ). Meanwhile, the temperature sensing properties of the thermally coupled levels (Er 3+ : 2 H 11/2 , 4 S 3/2 ) in Cs 2 NaBiCl 6 :40%Er 3+ are also investigated systematically based on the luminescence intensity ratio principle, and the maximum relative sensitivity is calculated to be as high as 1.27% K -1 (980 nm) and 1.57% K -1 (808 nm). Fortunately, the thermal stability and the performance for temperature readout of the studied phosphors are still maintaining a high level after doping sensitizers. The insights provided by this work will broaden the scope of lead-free halide double perovskites in the fields of luminescence and thermometry.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2673-2683
·
IF 2.302
Huang Zhangyu,Yi Mengji,Gao Huiping,Zhang Zhenlong,Mao Yanli
A strategy is demonstrated for simultaneous size and color tuning of KZnF 3 :Yb 3+ /Er 3+ nanocrystals through transition metal Mn 2+ doping. The experimental results indicate that the introduction of Mn 2+ into the KZnF 3 :Yb 3+ /Er 3+ reaction system facilitates the decrease of the crystal size. Moreover, in the case of a high concentration of Mn 2+ doping, the downshifting (DS) and upconversion (UC) luminescence all show a single red band emission. In this work, we mainly investigate the DS and UC energy transfer process among Mn 2+ /Yb 3+ /Er 3+ in KZnF 3 nanocrystals by the detection and analysis of the absorption, excitation, emission, and transient fluorescence spectra. The results show that both Mn 2+ and Yb 3+ ions can decrease the green emission while improving the red luminescence of Er 3+ . This DS and UC single red color tuning is significant for the application of nanoparticles in light conversion, biological labeling, or plant photosynthesis.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Mei-Hong Liu,Teng-Teng Li,Xiao Wang,Da-Yu Liu,Ning Yuan,De-Long Zhang,Yue Tian
Er 3+ /Yb 3+ -codoped CaIn 2 O 4 nano-fibers with good morphology were synthesized by electrospinning technique. X-ray diffraction was performed on the synthesized phosphor of nano-fibers to confirm that the CaIn 2 O 4 crystalline phase is dominant in it. The morphology of the nano-fibers was characterized by scanning electron microscopy. Optimal power supply voltage and thickener concentration for the synthesis were obtained. Er 3+ 980-nm-upconverted emission characteristics of the nano-fibers were investigated. The results show that two-photon process is the dominant mechanism for the upconversion emissions. The nano-fibers doped with 5 mol% Er 3+ display the strongest upconversion fluorescence. Temperature characteristics of the green 530 and 550 nm upconversion fluorescence of the nano-fibers were also studied for thermometry purposes. The results reveal that the nano-fibers show thermally stable spectral structure and the ones doped with 5 mol% Er 3+ display the highest thermal sensitivity of green fluorescence intensity ratio. We conclude that there exists an optimal Er 3+ concentration of 5 mol%, and the CaIn 2 O 4 nano-fibers doped with this optimal Er 3+ concentration display some spectroscopic properties favorable for ratiometric thermometry in the high-temperature regime.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·
IF 2.1
Xinzhu Gan,Bin Tian,Zhigang Wang,Yong Xu,Ling Li,Lin Wang,Chonghe Xu
This study aimed to prepare YAlO 3 fibers doped with 2 mol% Er 3+ using electrospinning and a carbon-free sol system as the precursor. X-ray diffraction, thermal gravimetry and differential thermal analysis, and Fourier transform infrared were employed to characterize the thermal behavior and crystallization process of the precursor fibers. Scanning electron microscope analysis showed that the Er 3+ :YAlO 3 fibers had a uniform diameter of 1 μm, a dense and crack-free surface, and a non-porous cross-section. Upon excitation at 450 and 488 nm, upconverted luminescence spectra were obtained from the Er 3+ :YAlO 3 fibers. This observation indicates their potential as upconversion luminescent agents capable of converting visible light into ultraviolet light. These properties make the Er 3+ :YAlO 3 fibers promising candidates for various upconversion luminescence 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 Materials Chemistry C
·
2024
·
IF 5.7
Xueting Zhao,Junhao Ma,Jindan Zha,Kuisui Huang,Chenghui Chai,Zhaoyi Yin,Zhiguo Song,Jianbei Qiu,Yongjin Li
Traditional inorganic photoreversible color-switching materials (PCSMs) usually exhibit slow color switching and single color switching characteristics, which severely restrict their use in information storage, anti-counterfeiting, and other applications. Herein, we report a fast photoresponsive color-switching inorganic PCSM based on oxygen-vacancy (OV) Bi3O4Br:Yb3+,Er3+ (BYE-OV) nanosheets. The BYE-OV nanosheets demonstrated considerable photoreduction activity and effective charge carrier separation when exposed to ultraviolet (UV) light, resulting in a rapid change in color from light yellow to dark brown. Moreover, under 980-nm excitation, the green and red emissions of the BYE-OV nanosheets were considerably enhanced, being 9.6 and 8.8 times higher than those of the BYE nanosheets, respectively. Additionally, BYE-OV nanosheets were combined with an agarose hydrogel to produce BYE-OV/agarose nanocomposite films, which exhibited excellent photoreversible color switching and upconversion (UC) luminescence. This research provides new insights into the development of innovative inorganic PCSMs, thereby considerably broadening their potential applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2024
·
IF 3.1
Yin Liu,Jie Wan,Yongbao Xiao,Dechao Yu
Glass forming regions of Al 2 O 3 -CaO-SrO (AlCaSr) system were systematically studied and clearly depicted by a combination of thermodynamic calculation method and traditional melt-quenching experiments. The glass forming region was first found with a composition range of Al 2 O 3 : 12–32 mol%, CaO: 43–68 mol%, and SrO: 20–36 mol%. Moreover, two representative glass compositions, 26.6Al 2 O 3 -49.4CaO-24SrO (AlCaSr-1) and 17.48Al 2 O 3 -58.52CaO-24SrO (AlCaSr-2), in central part of the experimental glass forming region and the corresponding glass doped with 1 mol% Er 2 O 3 , i.e., AlCaSr-1-Er and AlCaSr-2-Er, were selected and carefully prepared in our lab. Detailed investigations proved that the AlCaSr glasses had excellent comprehensive properties with high T g temperature (∼ 800 °C), wide transparency wavelength range (0.3–6 μm), and low maximum phonon energy (∼ 770 cm −1 ), and good 2.7 μm mid-infrared emitting properties via doping Er 3+ activators. These results highlight the potential application of AlCaSr glasses as infrared materials, and could benefit the development of high-performance infrared glasses.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 103
·101707-101713
·
IF 3.289
Shengjun Zhang,Jiajia Zhou,Ruozhen Wu,Lei Lei,Zhen Xiao,Junjie Zhang,Shiqing Xu
Lanthanide (Ln3+)-doped nanoparticles that produce strong red upconversion (UC) luminescence are desirable for biological applications. For nanoparticles, modification of their electronic properties and stabilization of their crystallographic phase are crucial for tuning their luminescence behaviors. Here, Yb3+–Er3+ doped Gd2O3 nanoparticles have been synthesized by calcining Gd2O2S in nitrogen (O2-free) and ambient air (∼21% O2), respectively. Various approaches including X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy and thermo-gravimetric and differential thermal analyses (TG-DTA) were used to characterize the structure, morphology and phase formation mechanism of the nanoparticles. Upconversion luminescence properties were investigated by emission intensity vs. excitation power (double logarithmic relationship) and temperature dependent emission spectroscopy. The different splitting transition probabilities of the cubic and/or monoclinic phase, the probability of multiphonon relaxations and cross relaxations between Er3+ ions are responsible for the efficient red emission in the cubic Gd2O3 nanoparticles. More importantly, the lower phonon energy of the pure cubic sample has good thermal stability in the current detectable range of 20–100 °C. These results imply that the cubic Gd2O3 upconversion nanoparticles may have multiplexing functionality in bio-imaging.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-12
·
IF 5.228
Pan Qiwen,Yang Dandan,Kang Shiliang,Qiu Jianrong,Dong Guoping
Rare earth doped mid-infrared (MIR) fluorescent sources have been widely investigated due to their various potential applications in the fields of communication, chemical detecting, medical surgery and so forth. However, with emission wavelength extended to MIR, multiphonon relaxation process that strongly quenched the MIR emission is one of the greatest challenges for such practical applications. In our design, we have described a controllable gas-aided annealing strategy to modulate the phase, crystal size, morphology and fluorescent performance of a material simultaneously. Uniform and monodispersed Er 3+ -doped La 2 O 2 S and La 2 O 2 SO 4 nanocrystals with a similar lattice structure, crystallinity, diameter and morphology have been introduced to investigate the impact of multiphonon relaxation on luminescence performance. Detailed spectroscopic evolutions in the region of MIR, near-infrared (NIR), visible upconversion (UC) and their corresponding decay times provide insight investigation into the fluorescent mechanism caused by multiphonon relaxation. A possible energy transfer model has also been established. Our results present direct observation and mechanistic investigation of fluorescent evolution in multiphonon relaxation process, which is conductive to design MIR fluorescent materials in the future. To the best of our knowledge, it is the first investigation on MIR fluorescent performance of La 2 O 2 S nanocrystals, which may find various applications in many photoelectronic fields.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 6
·693-702
·
IF 2.889
Xu Jie,Lu Qiling,Lin Jinfeng,Lin Cong,Zheng Xinghua,Lin Tengfei,Wu Xiao
Er 3+ -doped Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 ( x Er-BCTZ, x = 0, 0.005, 0.01, 0.015) multifunctional thick films were prepared by the tape-casting method, using sol-gel-derived nano-sized powders as the matrix material. The surface morphologies, photoluminescence, and electrical properties were investigated. Dense microstructures with pure perovskite structure were obtained in the thick films. By doping an appropriate amount of Er 3− , the samples exhibit superior up-conversion photoluminescence performance and simultaneously enhanced electrical performances. In addition, relatively higher texture fractions (with the largest value of 83.5%) were realized through introducing plate-like BaTiO 3 templates to make the thick film grow by the [001] c orientation. And the ferro-/piezoelectric properties of the thick films were further improved, showing potential in the applications of micro-optoelectronic devices.
研究领域:
材料科学
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光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 7
·1-11
·
IF 1.604
Yao Hanyu,Shen Honglie,Tang Quntao,Yang Nannan,Zhai Zihao,Li Yufang
NaY(WO 4 ) 2 : Er 3+ phosphors with various doping concentrations of [Er 3+ ]/([Er 3+ ]+[Y 3+ ]) (0, 5, 7, 10, 12, 15%) were successfully synthesized by high-temperature solid-state reaction. X-ray diffraction (XRD) measurement demonstrated the presence of tetragonal-phase NaY(WO 4 ) 2 phosphors and Fourier transform infrared (FT-IR) spectra showed a strong υ 3 stretching vibration mode of WO 4 2− , indicating the good crystallization of the phosphors. Well-crystallized phosphors showed a fine morphology with particle sizes of 0.8–10 µm by scanning electron microscope (SEM). Under excitation of 980 nm laser, Er 3+ -doped phosphors exhibited strong green emissions centered at 527 and 549 nm in addition to a 665 nm emission band in the red region, which were assigned to the 2 H 11/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions, respectively. When the doping concentration was 10%, the intensities of green and red emissions reached their maximum values, stronger than that in 5% Er 3+ doped one by 13 times. The double-logarithm plot of the upconversion (UC) emission intensity to the excitation power for different Er 3+ doping concentrations depicted that at least two infrared photons were involved for every emitted green and red photon. UC emission intensity changing with temperature displayed different trends for the phosphors with different Er 3+ concentrations. The enhancement for green emission band centered on 549 nm could reach 50 times at 30 K in sample with 5% Er 3+ concentration. Under excitation by 355 nm laser, all the phosphors showed a strong PL emission band at 430 nm, while green luminescence band locating from 540 to 570 nm was only observed in 7, 10, and 12% Er 3+ -doped phosphors, which was ascribed to 4 S 3/2 → 4 I 15/2 transition.
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
Shiying Tan,Xusheng Wang,Yan Zhao,Yanxia Li,Xi Yao
Rare earth doped upconversion luminescent materials have the advantages of low toxicity, high chemical stability, excellent photostability, narrow emission band, and long luminescent life, but their low fluorescence quantum efficiency restricts their practical application in the field of temperature sensing. In this paper, Er 3+ doped KYb(MoO 4 ) 2 (KYM) phosphors were synthesized by a temperature solid state reaction method. When the doped concentration is 5 mol%, the luminescence intensity get its strongest value. On this basis, 2 mol% trivalent ions Gd 3+ , La 3+ and Y 3+ (R 3+ ) were doped respectively, and the luminescence intensity increased by about 2 times. By the fluorescence intensity ratio technique, the KYM:5Er phosphor has the maximum absolute temperature sensitivity of 0.0106 K -1 . By codoping 2 mol% Gd 3+ in KYM:5Er, the upper limit of temperature measurement increased from 513 K to 663 K, which shows that Er 3+ -doped and Er 3+ /R 3+ -codoped KYM have the potential as temperature sensors .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Optics Express
·
2016
·Vol. 7
·期 6
·2174-2185
·
IF 3.344
Xuanyuan Wen,Baoju Wang,Ruitao Wu,Nana Li,Sailing He,Qiuqiang Zhan
Simultaneous deep macroscopic imaging and microscopic imaging is in urgent demand, but is challenging to achieve experimentally due to the lack of proper fluorescent probes. Herein, we have designed and successfully synthesized simplex Er3+-doped upconversion nanoparticles (UCNPs) with double excitation bands for simultaneous deep macroscopic and microscopic imaging. The material structure and the excitation wavelength of Er3+-singly doped UCNPs were further optimized to enhance the upconversion emission efficiency. After optimization, we found that NaYF4:30%Er3+@NaYF4:2%Er3+ could simultaneously achieve efficient two-photon excitation (2PE) macroscopic tissue imaging and three-photon excitation (3PE) deep microscopic when excited by 808 nm continuous wave (CW) and 1480 nm CW lasers, respectively. In vitro cell imaging and in vivo imaging have also been implemented to demonstrate the feasibility and potential of the proposed simplex Er3+-doped UCNPs as bioprobe.
研究领域:
生物医学工程
·
材料科学
·
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）