Advanced Optical Materials
·
2023
·Vol. 11
·期 24
·2301126
·
IF 9
Dongping Wen,Shanling Zuo,Chunfeng Huang,Zongqian Tan,Fuxi Lu,Yi Liang,Xiaoming Mo,Tao Lin,Sheng Cao,Jianrong Qiu,Jialong Zhao,Ping Chen
Excitation polarized upconversion luminescence (EPUL) from lanthanide ions has attracted considerable attention due to its wide applications in microfluidics, single particle tracking, security inks, and cell internal viscosity testing. However, controlling the degree of excitation polarization (DOEP) of the EPUL remains a significant challenge. Here, the modulation of the DOEP (from 0 to 0.5) of the EPUL from Er 3+ doped single nanorods by changing the concentration of doped Er 3+ , Yb 3+ , or Mn 2+ is systematically studied. By analyzing the lifetimes and disproportionate changes in luminescence intensities, it is found that optimizing Er 3+ , Yb 3+ , or Mn 2+ concentration can reduce non-radiative transition and population density in excited states, leading to the enhancement of the DOEP under a good alignment of transition dipoles. Furthermore, the possibility of anti-counterfeiting based on such tunable EPUL is illustrated. Three kinds of fine patterns with a small size of 10 µm are realized by assembling the single nanorods accurately via optical tweezers. The patterns and their EPUL guarantee double protection for the feasibility of anti-counterfeiting. The findings of this study offer insights into the EPUL from lanthanide ions and provide a microscale platform via the EPUL for the application of multidimensional information encoding and reconfigurable double anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 9
·1-14
·
IF 2.5
Li Yan,Li Xiangping,Fan Chen,Liu Ziru,Cheng Lihong,Xu Sai,Cao Yongze,Yu Hongquan,Chen Baojiu
Using a solid-state technique under low temperature conditions, Er 3+ /Yb 3+ co-doped Bi 2 Mo 2 O 9 phosphors with different concentrations were prepared, exhibiting excellent green up-conversion luminescence property. A thorough investigation was conducted on the phase structure, optical transition, up-conversion luminescence, and down-shifting luminescence properties of the prepared samples. Bi 2 Mo 2 O 9 : Er 3+ /Yb 3+ phosphors excited at 381, 980, and 1550 nm showed strong green fluorescence together with very faint red emission. The mechanism of up-conversion luminescence and its capacity for temperature sensing were examined under the excitation of various wavelengths. Under 980 nm excitation, the maximal relative and absolute sensitivities were determined to be 1.107%K − 1 and 0.756%K − 1 at 303 K and 513 K, respectively. Furthermore, the Judd-Ofelt intensity parameters of Er 3+ in Bi 2 Mo 2 O 9 : Er 3+ /Yb 3+ phosphors were calculated using the diffuse reflectance spectra and fluorescence lifetime of Er 3+ . In addition, material was combined with polyacrylic acid to make an anti-counterfeiting pattern. The results indicate that Bi 2 Mo 2 O 9 : Er 3+ /Yb 3+ phosphor is an excellent green phosphor with optical temperature measurement function, and it also has certain applications in the field of anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2015
·Vol. 24
·期 11
·118501
·
IF 1.603
Chang-Bai Liu,Ying He,Sheng-Lei Wang
In this work, pure α-Fe2O3 and Er2O3-Fe2O3 nanotubes were synthesized by a simple single-capillary electrospinning technology followed by calcination treatment. The morphologies and crystal structures of the as-prepared samples were characterized by scanning electron microscopy and x-ray diffraction, respectively. The gas-sensing properties of the as-prepared samples have been researched, and the result shows that the Er2O3-Fe2O3 nanotubes exhibit much better sensitivity to ethanol. The response value of Er2O3-Fe2O3 nanotubes to 10 ppm ethanol is 21 at the operating temperature 240°, which is 14 times larger than that of pure α-Fe2O3 nanotubes (response value is 1.5). The ethanol sensing properties of α-Fe2O3 nanotubes are remarkably enhanced by doping Er, and the lowest detection limit of Er2O3-Fe2O3 nanotubes is 300 ppb, to which the response value is about 2. The response and recovery times are about 4 s and 70 s to 10 ppm ethanol, respectively. In addition, the Er2O3-Fe2O3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2015
·
IF 1.909
Xuesong Wang,Jinbao Zhang,Lianyuan Wang,Shouchun Li,Li Liu,Chang Su,Lili Liu
Pure and Er-doped In 2 O 3 nanotubes were systematically fabricated by using a single nozzle eletrospinning method followed by calcination . The as-synthesized nanotubes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry and X-ray powder diffraction (XRD). Compared with pure In 2 O 3 nanotubes, Er-doped In 2 O 3 nanotubes exhibit improved formaldehyde sensing properties at 260 °C. The response of Er-doped In 2 O 3 nanotubes to 20 ppm formaldehyde is about 12, which is 4 times larger than that of pure In 2 O 3 nanotubes. The response and recovery times of Er-doped In 2 O 3 nanotubes to 20 ppm formaldehyde are about 5 and 38 s, respectively. Furthermore, the response of Er-doped In 2 O 3 nanotubes to 100 ppb formaldehyde is 2.19.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Tong,Hongquan Yu,Xiangping Li,Sai Xu,Baojiu Chen
Owing to their environmental friendliness, structural tunability, and ability to emit self-trapped excitons, lead-free halide double perovskites (DPs) have demonstrated significant potential for applications in light-emitting diodes (LEDs) and photodetectors. However, their chemical and thermal stability is generally insufficient. These limitations hinder their practical application in LEDs, as these devices typically generate considerable heat under high operating currents and prolonged usage, particularly in the case of infrared LEDs. In this work, Er 3+ -doped double perovskites (Cs 2 NaYCl 6 and the Cs 2 NaYCl 6 @0.6 KBr composite) were synthesized via a hydrothermal method. The emission intensity of Cs 2 NaYCl 6 :2 % Er 3+ @0.6 KBr is five times greater than that of Cs 2 NaYCl 6 :2 % Er 3+ within the wavelength range of 1400–1600 nm. In the Cs 2 NaYCl 6 :Er 3+ @0.6 KBr composite, the surface defects of Cs 2 NaYCl 6 :Er 3+ were modified by the introduction of KBr, leading to an increase in the external quantum efficiency (EQE) of Cs 2 NaYCl 6 :Er 3+ from 9.5 % to 30.0 %. Under a 150 mA working current, the operating temperatures of the near-infrared (NIR) LED devices based on the Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr composite are 53.2 and 47.4 °C, respectively. After working for 2 h, the temperatures of the NIR LEDs based on Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr were 60.3 °C and 46.0 °C, respectively, under a 100 mA operating current.
研究领域:
材料科学
·
光学工程
·
固态照明技术
·
稀土发光材料
✓ 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）