CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qinghai Sun,Zhibo Zheng,Xiaolu Yang,Yanxia Zhao,Zhou Luo,Chao Wang,Yanhua Song,Haifeng Zou,Shihou Sheng
Herein, a variety of single-phase full-spectrum emission phosphors doped with Eu 2+ were synthesized. Under the 350 nm excitation, as K + and Y 3+ were introduced into Ca 10 Na(PO 4 ) 7 (CNP):1.5%Eu 2+ , respectively, the emission color of Ca 9.85 K y Na (1- y ) ( PO 4 ) 7 :1.5%Eu 2+ (0 ≤ y ≤ 1.0) was tuned from yellow to cyan, while that of Ca (9.85- z ) NaY 0.667 z (PO 4 ) 7 :1.5%Eu 2+ (0 ≤ z ≤ 1.0) was tuned from yellow to green. The internal quantum yield (QY) of Ca 9·85 K 0·4 Na 0·6 (PO 4 ) 7 (CKNP):1.5%Eu 2+ and Ca 9·45 NaY 0·267 (PO 4 ) 7 (CNYP):1.5%Eu 2+ reached 47.47 % and 27.11 %, respectively. The introduction of K + or Y 3+ made Eu 2+ selectively occupy the Ca sites and led to changes in the local environment of Eu 2+ , allowing for spectral tuning emission. In addition, the luminescence intensity of the samples retained 54.59 % and 31.34 % of their room temperature values. Eventually, two white light emitting diode (WLED) devices were fabricated, combining the synthesized white emitting phosphors with 365 nm ultraviolet (UV) chips. They exhibited high color rendering indices of 84.7 and 77.0, along with low correlated color temperatures of 5435 K and 5023 K. The Commission Internationale de L'Eclairage (CIE) color coordinates were (0.3349, 0.3975) and (0.3517, 0.4366), respectively. The results pointed to the phosphors' potential suitability for use in the WLED sector.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Lanxiu Ni,Xuhui Geng,Shenghong Li,Haijing Ning,Yan Gao,Yafeng Guan
A flame photometric detector with a silicon photodiode assembly instead of a photomultiplier tube for sulfur detection was developed and evaluated. The photosensitive area of photodiode, the optical design, and band-pass filters, were optimized. It was found that the optimal photosensitive area of the photodiode was 100 (mm) 2 , and three focus lenses combined with a broad band-pass filter of 378/52 nm and a QB21 glass yielded the best result. This design fully utilized the wide emission spectrum of S 2 *, the response characteristics of silicon photodiode, and effective absorption of strong emission spectrums of OH* at wavelength around 310 nm by QB21 glass. The limits of detection for nine kinds of sulfur containing compounds were between 5.8 × 10 −12 to 9.5 × 10 −12 g s −1 . This mode provided a linear response of 3 orders of magnitude for compounds being tested and a selectivity of sulfur over carbon of 10 5 . It is demonstrated for the first time that the overall performance of the flame photometric detector integrated with a silicon photodiode assembly work at room temperature was comparable to a conventional detector coupled with a photomultiplier tube, with advantages of short equilibration time, robust to electromagnetic interference and vibration, and low cost. The new detector can find wide application in gas chromatography and on-line monitoring instruments for sulfur measurement.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ChemPlusChem
·
2018
·Vol. 83
·期 11
·1052-1056
·
IF 3.205
Wenxu Yin,Xiaoyu Zhang,Xue Bai,Dingke Xue,Xingwei Zhuang,Hongwei Song,William W. Yu
Graphical S-TOP and go ! A low-cost, one-pot synthesis of WS 2 quantum dots was devised that relies on activated elemental sulfur (S-TOP, S dissolved in tri-n-octylphosphine) instead of an organic sulfur source. Light-emitting devices prepared from this material display a high color rendering index of 93 (see figure). We report a facile and low-cost synthesis of WS 2 quantum dots with bright broad-band emission, which are suitable for lighting applications. The thus fabricated WS 2 light-emitting diodes (LEDs) exhibit voltage independent electroluminescence spectra, and the optimized white LEDs generate a high color rendering index of 93.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 32
·5355-5362
·
IF 3.117
Jianing Tan,Song Jiang,Binghui Ge,Bojia Xu,Baobao Cao
SnO2(ZnO:Sn)m is a new phase recently found in the diagram of a ZnO–SnO2 binary system in the form of a one-dimensional nanowire, which is a new group of superlattice oxide besides the widely known M2O3(ZnO)m (M = trivalent elements, such as In, Ga, and Al, and m = integer). Thereafter, more comprehensive structural and physical properties of SnO2(ZnO:Sn)m are still quite lacking due to the difficulties in high purity synthesis. In this study, we demonstrate a rational design for the growth of SnO2(ZnO:Sn)m superlattice nanowire arrays using a home-built double-tube chemical vapor deposition (CVD) system for the first time. The atomic microstructure of the nanowire array was investigated by Cs-corrected scanning transmission electron microscopy (STEM), and a phenomenon of unsaturated Sn occupation in Sn–O octahedral layers was observed. Two new vibrational modes at 276 cm−1 and 698 cm−1 were found in Raman measurement. The photoluminescence (PL) spectrum of SnO2(ZnO:Sn)m superlattice nanowires displays an interesting broad-spectrum emission in the range of around 380–570 nm. Kelvin probe force microscopy reveals that the average work function of SnO2(ZnO:Sn)m nanowires is in the range of 4.05–4.32 eV.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）