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| 1 | Synthesis and photoluminescence properties of Sr4La(PO4)3O: RE3+ (RE=Eu/Tb/Ce) phosphors显示文摘A series of RE^(3+)(RE=Eu∕Tb∕Ce)-activated Sr_4La(PO_4)_3O(SLPO) phosphors are synthesized with a hightemperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology,and CIE values of the SLPO:Eu^(3+)∕Tb^(3+)∕Ce^(3+)phosphors are investigated. Under 394 nm excitation, the SLPO:Eu^(3+)exhibits red emission, and the SLPO:Tb^(3+)presents a green emission upon 379 nm excitation, while Ce^(3+)-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO:Eu^(3+)∕Tb^(3+)∕Ce^(3+)phosphors can be effectively excited by nearultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes. | 程菊 张佳 张宏超 Sardar Maryam 边心田 沈中华 倪晓武 陆建 | 2017 | Chinese Optics Letters2017，15，12： | 1 |
| 2 | A single-phase full-color phosphor Sr_(2)Ca_(2)La(PO_(4))_(3)O:Eu^(2+),Tb^(3+),Mn^(2+):Photoluminescence and energy transfer显示文摘A single-phase full-color emitting phosphor Sr_(2)Ca_(2)La(PO_(4))_(3)O:Eu^(2+),Tb^(3+),Mn^(2+) was synthesized by the high temperature solid-state method.The phase formation,luminescence properties,thermal stability,and energy transfer from Eu^(2+)to Tb^(3+) and Eu^(2+)to Mn^(2+) in Sr_(2)Ca_(2)La(PO_(4))_(3)O were investigated in details.Tunable emission color from blue to blueish green or orange can be observed under 365 nm near-ultraviolet excitation based on the energy transfer from Eu^(2+) to Tb^(3+)or Mn^(2+) ions by varying the ratio of Eu^(2+)/Tb^(3+)or Eu^(2+)/Mn^(2+) ions.White light was obtained with chromaticity coordinates of(0.3558,0.3500)in the Sr_(2)Ca_(2)La(PO_(4))_(3)O:0.04Eu^(2+),0.08Tb^(3+),0.40Mn^(2+) phosphor,suggesting their potential applications in white light emitting diodes. | Ju Cheng Xintian Bian Zhangyin Zhai Maryam Sardar Jian Lu | 2022 | Journal of Rare Earths2022，40，4： | 1 |
| 3 | Thermomechanical response of aluminum alloys under the combined action of tensile loading and laser irradiations显示文摘This study reports the investigation of the thermomechanical behavior of aluminum alloys(Al-1060, Al-6061, and Al-7075) under the combined action of tensile loading and laser irradiations. The continuous wave ytterbium fiber laser(wavelength 1080 nm) was employed as the irradiation source, while tensile loading was provided by the tensile testing machine. The effects of various pre-loading and laser power densities on the failure time, temperature distribution, and the deformation behavior of aluminum alloys are analyzed. The experimental results represent the significant reduction in failure time for higher laser power densities and for high preloading values, which implies that preloading may contribute a significant role in the failure of the material at elevated temperature. Fracture on a microscopic scale was predominantly ductile comprising micro-void nucleation, growth, and coalescence. The Al-1060 specimens behaved plastically to some extent, while Al-6061 and Al-7075 specimens experienced catastrophic failure. The reason and characterization of material failure by tensile and laser loading are explored in detail. A comparative behavior of under-tested materials is also investigated. This work suggests that studies considering only combined loading are not enough to fully understand the mechanical behavior of under-tested materials. For complete characterization, one should consider the effect of heating as well as loading rate and the corresponding involved processes with the help of thermomechanical coupling and the thermal elastic-plastic theory. | Mohsan Jelani 李泽文 沈中华 Maryam Sardar | 2018 | Chinese Physics B2018，27，3： | 0 |
| 4 | Numerical simulation and experimental investigation of Ti-6Al-4V melted by CW fiber laser at different pressures显示文摘The interaction of continuous wave(CW) fiber laser with Ti-6Al-4V alloy is investigated numerically and experimentally at different laser fluence values and ambient pressures of N_2 atmosphere to determine the melting time threshold of Ti-6Al-4V alloy. A 2D-axisymmetric numerical model considering heat transfer and laminar flow is established to describe the melting process. The simulation results indicate that material melts earlier at lower pressure(8.0 Pa) than at higher pressure(8.8×10~4 Pa) in several milliseconds with the same laser fluence. The experimental results demonstrate that the melting time threshold at high laser fluence(above 1.89×10~8 W/m^2) is shorter for lower pressure(vacuum), which is consistent with the simulation. While the melting time threshold at low laser fluence(below 1.89×10~8 W/m^2) is shorter for higher pressure. The possible aspects which can affect the melting process include the increased heat loss induced by the heat conduction between the metal surface and the ambient gas with the increased pressure, and the absorption variation of the coarse surface resulted from the chemical reaction. | Aasma Tabassum 周洁 韩冰 倪晓武 Maryam Sardar | 2017 | Optoelectronics Letters2017，13，4： | 0 |
| 5 | Combining Cubic Spline Interpolation and Fast Fourier Transform to Extend Measuring Range of Reflectometry显示文摘The reflectometry is a common method used to measure the thickness of thin films. Using a conventional method,its measurable range is limited due to the low resolution of the current spectrometer embedded in the reflectometer.We present a simple method, using cubic spline interpolation to resample the spectrum with a high resolution,to extend the measurable transparent film thickness. A large measuring range up to 385 m in optical thickness is achieved with the commonly used system. The numerical calculation and experimental results demonstrate that using the FFT method combined with cubic spline interpolation resampling in reflectrometry, a simple,easy-to-operate, economic measuring system can be achieved with high measuring accuracy and replicability. | 程菊 陆建 张宏超 雷枫 Maryam Sardar 边心田 左芬 沈中华 倪晓武 施锦 | 2018 | Chinese Physics Letters2018，35，5： | 0 |
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