ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Lin Yang,Hao Wu,Guo-hui Pan,Liangliang Zhang,Huajun Wu,Zhendong Hao,Feng Liu,Jiahua Zhang
The luminescence thermal enhancement (LTE), in lanthanide-doped upconverting nanocrystals (UCNCs), has attracted extensive attention for its applications in anticounterfeiting, temperature sensing, and so on. Some mechanisms for LTE were proposed, including thermally induced water desorption from the surface of UCNCs, but conclusive evidence is absent for any of the mechanisms. Here, vacuumizing is employed in the experiment for the LTE in NaYF4:Ho3+/Yb3+ UCNCs, and significantly promoted LTE is observed. The 300–450–300 K temperature cycling experiment in vacuum shows continuous luminescence enhancement without luminescence intensity recovery as in the cooling process in moisture air, indicating the effect of water desorption because water readsorption is blocked in vacuum. It is found that the Ho3+ 5I6 level can be deexcited by direct long-range energy transfer to water adsorbed at the surface of nanocrystals due to resonant coupling between the Ho3+ 5I6 → 5I7 transition and the −OH vibration of water. As a result, water desorption suppresses the 5I6 depopulation and thus enhances the luminescence of Ho3+. Finally, the regulation of upconversion LTE is realized by adjusting the size of nanocrystals and Ho3+ or Yb3+ concentrations. Our findings indicate that the vacuumizing technique is an effective method to distinguish water-desorption-induced LTE. This work deepens the understanding of LTE and offers insights into the regulation of LTE.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTIK
·
2021
·
IF 2.443
Pan Lu,Lin Lin,Zheng Li,Zhuohong Feng,Yuanming Yang,Jieyi Cai,Zhezhe Wang,Zhiqiang Zheng
Dual-phase compounds consisting of CsPbBr 3 perovskite quantum dots (PQDs) and NaYF 4 :Ho 3+ nanoparticles (NPs) were prepared, and their phase compositions and luminescence properties were characterized. The temperature-dependent fluorescence spectra of compounds were measured under 447 nm excitation in the temperature range from 123 K to 433 K. With the increase of temperature, the fluorescence intensities of PQDs and NPs show different decreasing trends due to different temperature quenching mechanisms. Then, the temperature sensing properties of compounds are studied via fluorescence intensity ratios (FIRs) of 529 nm (CsPbBr 3 ) to 647 nm and 751 nm (NaYF 4 :Ho 3+ ). The result shows that I 529 /I 751 owns super large absolute sensitivity (385 K −1 ), high relative sensitivity (5.13%∙K −1 ) and distinct optimum temperature uncertainty (0.00345 K). Therefore, this compound may be used as highly sensitive temperature sensors .
研究领域:
材料科学
·
光学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Yaqian Chen,Huanping Wang,Xiaoting Zhang,Zhen Xiao,Qinghua Yang,Ruoshan Lei,Degang Deng,Lihui Huang,Shiqing Xu
(Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders doped with various concentrations of Tm 3+ and Ho 3+ were prepared by the citrate method. The standard cubic Y 2 O 3 phase can be matched in the Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders. The nanopowders exhibit average particle sizes of 40, 60, 80 and 100 nm after calcinated at 900, 1000, 1100 and 1200 °C, respectively. The energy transfer from Tm 3+ to Ho 3+ and the optimum fluorescence emission around 2 μm were investigated. Results indicate that the emission bands at around 1.86 and 1.95 μm correspond to 3 F 4 → 3 H 6 transition of Tm 3+ and 5 I 7 → 5 I 8 transition of Ho 3+ , respectively. Better spectral properties were achieved in Tm 3+ /Ho 3+ co-doped (Y 0.87 La 0.1 Zr 0.03 ) 2 O 3 nanopowders with the average size of 100 nm obtained at the conditions of the treatment of precursors calcinated at 1200 °C for 2 h doped with 1.5 mol% Tm 3+ and 1 mol% Ho 3+ .
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Xiaotong Zhao,Mo Liu,Niannian Xu,Shunbin Wang,Pengfei Wang
This study presents the experimental realization of a microsphere laser resonator designed to operate within the approximate wavelength range of 1.2 μm and 2.0 μm. This resonator, employing a Ho 3+ -doped fluoroaluminate glass microsphere, was stimulated by a 1150 nm laser, marking the first demonstration of its kind. The observed laser emissions at ∼1.2 μm and ∼2.0 μm were ascribed to the transitions of Ho 3+ ions, specifically 5 I 6 → 5 I 8 and 5 I 7 → 5 I 8 , respectively. The fabrication of the microsphere, possessing a characteristic diameter of approximately 50 μm, entailed the controlled melting of a fluoroaluminate glass filament through the application of a focused CO 2 laser beam. Concurrently, a tapered fiber with a waist diameter of ∼2 μm was created by subjecting a standard silica single-mode fiber to a process of controlled heating and stretching. The findings of this investigation suggest promising prospects for the development of multi-wavelength lasers utilizing fluoroaluminate glass microspheres, particularly in intricate environmental settings.
研究领域:
光学
·
材料科学
·
激光技术
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Zehua Zhang,Lili Wang,Ruiliang Zuo,Zhenzhen Jiang,Guangyong Jin
The single-component white light emission microcrystals were synthesized in Bi 3+ /Sb 3+ /Ho 3+ ions tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 double perovskites by a simple precipitation method. In Bi 3+ /Sb 3+ ions double-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 microcrystals, the tunable emission from yellow (Bi 3+ ) to blue (Sb 3+ ) can be achieved under ultraviolet light excitation. Particularly, the white light emission is obtained after doping Ho 3+ ion because of the energy transfer processes of Bi 3+ →Ho 3+ and Sb 3+ →Ho 3+ . The chromaticity coordinates (CIE) of Cs 2 Ag 0.2 Na 0.8 LuCl 6 :5 mol% Bi 3+ ,1 mol% Sb 3+ ,15 mol% Ho 3+ microcrystal are (0.3354, 0.3394) under 315 nm excitation. Meanwhile, the white light emissions with different color temperatures are obtained through varying the excitation wavelength (255–365 nm). Additionally, temperature-dependent fluorescence spectra show that the emission intensity of Bi 3+ /Sb 3+ /Ho 3+ tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 microcrystal at 423 K remains 54% of that at 303 K. Moreover, the fluorescence intensity ratio (FIR) of 641 and 665 nm is highly temperature-dependent, the relative sensitivity ( S r ) reaches 1.06%/K at 303 K under 315 nm excitation. Simultaneously, the microcrystal shows thermochromism phenomenon, and the emission changes from white to blue-purple with the increase of temperature from 303 to 513 K. The novel temperature sensing is achieved based on CIE coordinates and temperature technology in Cs 2 Ag 0.2 Na 0.8 LuCl 6 :5 mol% Bi 3+ ,1 mol% Sb 3+ ,15 mol% Ho 3+ microcrystal by exciting at 315 nm. The corresponding maximum S r is 0.34%/K. Accordingly, Bi 3+ /Sb 3+ /Ho 3+ ions tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 double perovskite has potential applications in the fields of white light emitting diode and optical temperature sensing.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 2
·1445-1456
·
IF 2.478
Qin Rongpang,Jinhua Xinwei,Hu Jinghua,Zhao Li
Dye-sensitized solar cells (DSSCs) based on conventional P25 photoanode films have poor photovoltaic performance due to their inability to utilize the infrared light, which accounts for 43% of the solar spectrum. To overcome this defect, we prepared the upconversion luminescent material NaYbF 4 : Ho 3+ by the solvent thermal method and incorporated it into the photoanode of DSSCs. The upconversion luminescent material NaYbF 4 : Ho 3+ is a composite multifunctional material that can absorb infrared light and emit different bands of visible light. The composite film formed by doping NaYbF 4 : Ho 3+ in the photoanode film can indirectly utilize infrared light to broaden the spectral absorption range and improve the absorption of photons. The effect of different incorporation ratios of fluorescent materials on cell performance was studied. Optimal performance devices based on optimized ratios of UCNPs achieve a high-power conversion efficiency of 7.52%, an improvement of 28.8% compared to conventional P25 nanoparticle-based DSSCs (5.84%). The improved performance of NaYbF 4 : Ho 3+ -based DSSCs could be attributed to the upconversion luminescence effect, high light-trapping efficiency, low charge transfer resistance, and long electron lifetime. This work provides a new possible way to extend the spectral response range of DSSCs and to prepare high-performance solar cells.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yiying Zhu,Guoxun Sun,Yining Wang,Yixin Sun,Xiaole Xing,Mengmeng Shang
Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho3+-doped Cs2NaBiCl6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn2+, apart from the characteristic emissions from Ho3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn2+ and a sharp emission peak at 657 nm from Ho3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs2NaBiCl6 to Mn2+ and then from Mn2+ to Ho3+. The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn2+ overcomes the low absorption efficiency caused by f–f forbidden transitions of Ho3+. Finally, the diverse luminescent performance within the Cs2NaBiCl6:Ho3+, Mn2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Optoelectronics
·
2023
·Vol. 16
·期 1
·1-11
·
IF 5.4
Zhang Chuancheng,Ding Shoujun,Wang Miaomiao,Ren Hao,Tang Xubing,Zou Yong,Dou Renqin,Liu Wenpeng
Optical thermometry based on the upconversion (UC) luminescence intensity ratio (LIR) has attracted considerable attention because of its feasibility for achievement of accurate non-contact temperature measurement. Compared with traditional UC phosphors, optical thermometry based on UC single crystals can achieve faster response and higher sensitivity due to the stability and high thermal conductivity of the single crystals. In this study, a high-quality 5 at% Yb 3+ and 1 at% Ho 3+ co-doped Gd 0.74 Y 0.2 TaO 4 single crystal was grown by the Czochralski (Cz) method, and the structure of the as-grown crystal was characterized. Importantly, the UC luminescent properties and optical thermometry behaviors of this crystal were revealed. Under 980 nm wavelength excitation, green and red UC luminescence lines at 550 and 650 nm and corresponding to the 5 F 4 / 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions of Ho 3+ , respectively, were observed. The green and red UC emissions involved a two-photon mechanism, as evidenced by the analysis of power-dependent UC emission spectra. The temperature-dependent UC emission spectra were measured in the temperature range of 330–660 K to assess the optical temperature sensing behavior. At 660 K, the maximum relative sensing sensitivity ( S r ) was determined to be 0.0037 K −1 . These results highlight the significant potential of Yb,Ho:GYTO single crystal for optical temperature sensors. Graphical abstract
研究领域:
光学材料
·
固体物理
·
发光光谱学
·
温度传感技术
✓ 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
METHODS
·
2019
·
IF 3.782
Hongshun Hao,Shouchen Hao,Hongman Hou,Gongliang Zhang,Yunxia Hou,Zuowei Zhang,Jingran Bi,Shuang Yan
A novel photoelectrochemical (PEC) immunosensor based on CdSe quantum dots (QDs) sensitized Ho 3+ /Yb 3+ -TiO 2 for the detection of Vibrio parahaemolyticus (VP) was assembled. The working electrode was constructed via the layer-by-layer (LBL) method with the Ho 3+ /Yb 3+ -TiO 2 , CdSe QDs, NHS/EDC, antibody of VP (anti-VP), bovine serum albumin (BSA) modified on the surface of the FTO in sequence. Ascorbic acid (AA) acts as an electron donor to combine photogenerated holes in order to provide a stable current system. Ho 3+ and Yb 3+ co-doping TiO 2 broadened the spectral response range of TiO 2 to the infrared region and improved the photocurrent responsiveness of TiO 2 . The PEC immunosensor, with Ho 3+ /Yb 3+ ratio of 1:5, Ho 3+ /Yb 3+ -TiO 2 of 2 mg/mL and PBS solution of pH 7.4, had an optimal photocurrent responsiveness. Immobilization of anti-VP was by classical NHS/EDC coupling reactions between COOH groups of CdSe QDs and NH 2 groups of the anti-VP. The results indicated that PEC immunosensors had a low detection limit of 25 CFU/mL, a wide detection range of 10 2 –10 8 CFU/mL, high stability, low price, and short detection time. This method could be promising for the rapid and ultrasensitive detection of pathogenic microorganisms in the food.
研究领域:
生物传感
·
食品安全检测
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2023
·Vol. 54
·期 6
·651-661
·
IF 2.5
Pengfei Shuai,Qingfeng Guo,Libing Liao,Zhaoliang Yan,Ke Su,Yujia Wang,Lefu Mei
In this work, a method for controllable regulation of crystal form was proposed for the first time and the effects of different crystal forms on the up-conversion luminescence properties of Ho 3+ , Yb 3+ co-doped K 3 Sc 0.5 Lu 0.5 F 6 (KSLF) phosphors was explored. KSLF:Ho 3+ , Yb 3+ phosphors were synthesized by the high temperature solid-state reaction method, and X-ray diffraction (XRD) results illustrate that the compounds can obtain monoclinic phase and cubic phase at different synthesis temperatures. In addition, according to the power-dependent up-conversion luminescence (UCL) intensity, the UCL mechanism and the electronic transition process are discussed. Simultaneously, the temperature sensing behavior of the best samples with different crystal forms at different temperatures was studied by fluorescence intensity ratio technique. All the results show that KSLF:Ho 3+ , Yb 3+ phosphors show great application potential in the field of temperature sensing, and the preparation of KSLF:Ho 3+ , Yb 3+ in different crystal forms can provide a reference value for crystal design and growth.
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 SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·8149-8156
·
IF 2.478
Yun Rui,Luo Li,He Jingqi,Wang Jiaxi,Li Xiaofen,Zhao Weiren,Nie Zhaogang
Lanthanide-doped system with adjustable multicolor and white up-conversion (UC) emission has been developed in GdVO 4 (GVO): Tm 3+ -Ho 3+ -Yb 3+ /-Nd 3+ phosphors, which are fabricated via a facile solid-state reaction. Herein, we study their phase structures and the Ho 3+ concentration effect on their up-conversion emission. Under 980 nm excitation, the Tm 3+ -Ho 3+ -Yb 3+ tri-doped GVO phosphors exhibit intense luminescence combined with red, green and blue (RGB) emission and the successive energy transfer between Tm 3+ -Ho 3+ -Yb 3+ ions causes a slight shift in the color coordinates of samples with different doping concentrations. Under 808 nm excitation, the color coordinate of the optimum GVO: Tm 3+ -Ho 3+ -Yb 3+ -Nd 3+ phosphor is located at (0.3277, 0.3433), which is closest to the ideal white light emission corresponding to (0.3333, 0.3333). Therefore, it is proved that these phosphors provide potential applications in the fields of displays, lasers and optical telecommunication.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）