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Photoluminescence Properties of New Deep Red-emitting Mn2+-activated CaLaGa3S6O Phosphors
Ruijin Yu,양현경,문병기,최병춘,정중현 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.7
A new deep red-emitting Mn<SUP>2+</SUP>-activated CaLaGa<SUB>3</SUB>S<SUB>6</SUB>O phosphor was prepared by using a solidstate reaction method. X-ray diffraction studies confirm a tetragonal structure with space group <i>P</i>2<sub>1</sub><i>m</i>. The emission spectrum showed a broad band with an emission maximum at 676 nm under a host excitation of 332 nm. The optimum PL emission intensity was obtained at a concentration of 0.03 mole of Mn<SUP>2+</SUP>. The fluorescence lifetime of Mn<SUP>2+</SUP> was calculated to be 0.368 ms for CaLaGa<SUB>3</SUB>S<SUB>6</SUB>O:0.03Mn<SUP>2+</SUP>. The Commission Internationale de I묮clairage (CIE) chromaticity coordinates showed that the phosphors emissions were in the deep red region and were very near to the National Television Standards Committee (NTSC) standard values for red. Since the phosphor excitation lies in the near-UV excitable region, giving a deep red emission, it can be used for applications in near-UV phosphor converted white LED lighting and display devices.
Preparation and luminescence of blue-emitting phosphor Ca2PO4Cl:Eu2+ for n-UV white LEDs
Ruijin Yu,Chongfeng Guo,Ting Li,Yan Xu 한국물리학회 2013 Current Applied Physics Vol.13 No.5
A series of blue-emitting Ca2 xEuxPO4Cl phosphors were synthesized by a solid state method in a reducing atmosphere. The factors those affect the structure and the photoluminescence (PL) intensities of phosphors,including the dosage of chlorine source CaCl2, reaction time and annealing temperature, have been investigated in detail. X-ray diffraction (XRD) and photoluminescence measurements were performed to testify the crystal structure and luminescent properties. The optimal Eu2þ concentration was determined, and the mechanism of the concentration quenching was predominated by dipoleedipole interaction. The present phosphor exhibits a strong absorption in the near-UV region, emits an intense blue emission centered at 451 nm and presents excellent thermal stability, suggesting that the phosphor is competitive as a promising blue-emitting phosphor for near ultraviolet (n-UV) light-emitting diodes (LEDs).
Luminescence and thermal-quenching properties of Dy3+-doped Ba2CaWO6 phosphors
Yu, Ruijin,Shin, Dong Soo,Jang, Kiwan,Guo, Yue,Noh, Hyeon Mi,Moon, Byung Kee,Choi, Byung Chun,Jeong, Jung Hyun,Yi, Soung Soo Elsevier 2014 Spectrochimica acta. Part A, Molecular and biomole Vol.125 No.-
A series of new double perovskite tungstate Ba2CaWO6:xDy(3+) (0.01 <= x <= 0.15) phosphors were synthesized via solid state reaction process. XRD analysis confirmed the phase formation of Ba2CaWO6:Dy3+ materials. The photoluminescence excitation and emission spectra, concentration effect, thermal-quenching, and decay property were investigated. The phosphor could be excited by the UV light region from 250 to 400 nm, and it exhibits blue (493 nm) and yellow (584 nm) emission corresponding to F-4(9/2)-H-6(15/2) transitions and F-4(9/2)-H-6(13/2) transitions, respectively. The optimum dopant concentration of Dy3+ ions in Ba2CaWO6:xDy(3+) is around 5 mol% and the critical transfer distance of Dy3+ is calculated as 14 angstrom. The thermal-quenching temperature is 436 K for Ba2CaWO6:0.05Dy(3+). The fluorescence lifetime is also determined in Ba2CaWO6:0.05Dy(3+). (C) 2014 Elsevier B.V. All rights reserved.
Yu, Ruijin,Gao, Zhiwen,Deng, Huajuan,Jeong, Jung Hyun North-Holland 2017 Journal of luminescence Vol.192 No.-
<P><B>Abstract</B></P> <P>A new fluoride phosphor of Eu<SUP>2+</SUP>-activated Ba<SUB>2</SUB>Zn<SUB>7</SUB>F<SUB>18</SUB> has been prepared via two-step solid-phase synthesis. Pure crystalline formation was verified by the X-ray diffraction (XRD) Rietveld refinement. The photoluminescence (PL) spectrum, decay curves (lifetimes), time-resolved emission, and internal quantum efficiency (QE) of Ba<SUB>2</SUB>Zn<SUB>7</SUB>F<SUB>18</SUB>:Eu<SUP>2+</SUP> were characterized. The phosphors show sensitive response to near-UV excitation and emit blueish green luminescence with a maximum quantum efficiency of 70%. The excitation band can well match with the commercial near-UV LED chips (360–400nm). This is favourable for fabricating white LED lighting devices. The scintillating properties were also confirmed under excitation of X-ray irradiation with a lifetime of 850ns. Eu<SUP>2+</SUP>-activated Ba<SUB>2</SUB>Zn<SUB>7</SUB>F<SUB>18</SUB> has a high thermal stability with activated energy of 0.63eV. It could be potential for high-performance lighting and scintillator due to desirable luminescence properties.</P>
Tao Zhu,Yuan Yuan,Qi Yu,Huiying Xiang,Xu Dai,Guoyong Liu,Ruijin Liao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
The overhead aluminum conductors are prone to corrosion, especially in areas with marine climates,which interferes with the safe operation of the power system. Herein, slippery liquid infused porous surface(SLIPS) conductors were successfully prepared on pure aluminum (Bare) conductors by anodizingand infusion of silicone oil. The corrosion resistance of the conductors during 30 days of salt spray corrosionand 7 days of energized conditions was studied. The results indicated that the corrosion of theBare and anodic aluminum oxide (AAO) conductors was more severe under energized (alternating current(AC) and direct current (DC)) conditions. The exacerbation of corrosion by DC energization wasremarkably higher than that of AC energization. The AAO conductor showed better corrosion resistancethan the Bare conductor, which was attributed to the porous alumina retarding the medium intrusion. Due to the barrier effect provided by the lubricant layer, the SLIPS conductor always presented excellentcorrosion resistance than the Bare and AAO conductors. In addition, the mechanical and electrical propertiesof the SLIPS conductor were comparable to the Bare conductor and could satisfy the basic requirementsfor practical applications. The prepared SLIPS conductors offer great application prospects for thecorrosion protection of aluminum conductors.
Gao, Zhiwen,Xue, Na,Jeong, Jung Hyun,Yu, Ruijin Elsevier 2017 Materials research bulletin Vol.95 No.-
<P><B>Abstract</B></P> <P>A series of novel bismuthate tellurate SrBi<SUB>2(1-<I>x</I>)</SUB>Eu<SUB>2<I>x</I> </SUB>TeO<SUB>7</SUB> (<I>x</I> =0.02–0.40) red-emitting phosphors were successfully prepared through a high-temperature solid-state reaction at 800°C. The compounds crystallized in the cubic structure with the space group <I>Pa</I> 3 ¯ . Photoluminescence characteristics indicate that the SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:Eu<SUP>3+</SUP> phosphor can be excited effectively under 465nm irradiation, which matches well with the output wavelength of blue LED chips. The emission spectrum of SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:Eu<SUP>3+</SUP> phosphor shows four peaks assigned to the <SUP>5</SUP>D<SUB>0</SUB>–<SUP>7</SUP>F<SUB>J</SUB> (<I>J</I> =0–4) transitions of Eu<SUP>3+</SUP> upon 394 and 465nm excitation. The maximum photoluminescence intensity was found at 30 mol% in the SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:<I>x</I>Eu<SUP>3+</SUP> phosphors. The quenching temperature for SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:0.30Eu<SUP>3+</SUP> was revealed at 403K by temperature dependent emission spectra. The CIE chromaticity coordinates of SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:0.30Eu<SUP>3+</SUP> are very close to the National Television System Committee (NTSC) standard red.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel bismuthate tellurate SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:Eu<SUP>3+</SUP> red-emitting phosphor was firstly synthesized. </LI> <LI> Its structure, luminescent properties are well studied and characterized. </LI> <LI> It was promising as the red component for GaN-chip based w-LEDs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A novel bismuthate tellurate SrBi<SUB>2</SUB>TeO<SUB>7</SUB>:Eu<SUP>3+</SUP> red-emitting phosphor can be excited efficiently under 465nm irradiation.</P> <P>[DISPLAY OMISSION]</P>
MALICIOUS URL RECOGNITION AND DETECTION USING ATTENTION-BASED CNN-LSTM
( Yongfang Peng ),( Shengwei Tian ),( Long Yu ),( Yalong Lv ),( Ruijin Wang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.11
A malicious Uniform Resource Locator (URL) recognition and detection method based on the combination of Attention mechanism with Convolutional Neural Network and Long Short-Term Memory Network (Attention-Based CNN-LSTM), is proposed. Firstly, the WHOIS check method is used to extract and filter features, including the URL texture information, the URL string statistical information of attributes and the WHOIS information, and the features are subsequently encoded and pre-processed followed by inputting them to the constructed Convolutional Neural Network (CNN) convolution layer to extract local features. Secondly, in accordance with the weights from the Attention mechanism, the generated local features are input into the Long-Short Term Memory (LSTM) model, and subsequently pooled to calculate the global features of the URLs. Finally, the URLs are detected and classified by the SoftMax function using global features. The results demonstrate that compared with the existing methods, the Attention-based CNN-LSTM mechanism has higher accuracy for malicious URL detection.