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wfw8712銅蟲 (初入文壇)
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1. 核/殼結構ZnS:Mn /ZnS 量子點光發(fā)射增強研究 張曉松, 李 嵐, 黃青松 , 張高峰, 徐建萍 , 宣榮衛(wèi), 魏鳳巍 2. Temperature dependence of the sole Mn2+ emissions in Manganese doped ZnS:Mn quantum dots Xiaosong Zhang, Gaofeng Zhang, Qingsong Huang, Fengwei Wei, and Yongliang Zhou |
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wfw8712: 金幣+15, ★★★★★最佳答案 2012-05-17 14:22:23
wfw8712: 金幣+15, ★★★★★最佳答案 2012-05-17 14:22:23
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Accession number: 20111513902033 Title: Temperature dependence of the sole Mn2+ emissions in manganese doped ZnS:Mn quantum dots Authors: Zhang, Xiao Song1, 2 ; Zhang, Gao Feng2 ; Huang, Qing Song2 ; Wei, Feng Wei2 ; Zhou, Yong Liang2 Author affiliation: 1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China 2 Institute of Material Physics, Tianjin University of Technology, Tianjin, 300191, China Corresponding author: Zhang, X. S. (zhangxiaosong@tjut.edu.cn) Source title: Advanced Materials Research Abbreviated source title: Adv. Mater. Res. Volume: 159 Monograph title: Micro Nano Devices, Structure and Computing Systems Issue date: 2011 Publication year: 2011 Pages: 572-577 Language: English ISSN: 10226680 ISBN-13: 9783037850091 Document type: Conference article (CA) Conference name: 2010 International Conference on Micro Nano Devices, Structure and Computing Systems, MNDSCS 2010 Conference date: November 6, 2010 - November 7, 2010 Conference location: Singapore, Singapore Conference code: 84505 Sponsor: International Science and Engineering Center (ISEC); National University of Singapore (NUS); Shenzhen University Publisher: Trans Tech Publications, P.O. Box 1254, Clausthal-Zellerfeld, D-38670, Germany Abstract: ZnS:Mn Quantum dots (QDs) excess of [S2-] were synthesized by the wet chemical precipitation method with an average diameter of 3.9 nm. Temperature dependence photoluminescence measurements of ZnS:Mn QDs excited at 330nm only show a clear broad emission band with peak at ∼595nm assigned to the 4T1&rarr6A1 transition within the 3d5 configuration of Mn2+ in QDs. Through the temperature dependence of emission intensity, emission energy and full widths at half maximum (FWHM), the mechanisms are analyzed to explain the temperature behavior of Mn2+ emission observed here reasonably. The Mn 2+ emission intensity decreases with increasing temperature. And the blue shift of the Mn2+ emission energy increase is also observed for increasing the temperature. Furthermore, the FWHM shows weak temperature dependence below 110 K and shows an increase with temperature increasing above 110 K. Consequently, the intrinsic mechanisms of temperature dependence photoluminescence are investigated. © (2011) Trans Tech Publications. Number of references: 15 Main heading: Semiconductor quantum dots Controlled terms: Electron correlations - Electron-phonon interactions - Manganese - Photoluminescence - Precipitation (chemical) - Temperature distribution - Zinc sulfide Uncontrolled terms: Average diameter - Blue shift - Broad emission bands - Doped ZnS - Electron phonon couplings - Emission energies - Emission energy full widths at half maximum photoluminescence - Emission intensity - Full widths at half maximums - Intrinsic mechanisms - Photoluminescence measurements - Quantum Dot - Quantum dots - Temperature behavior - Temperature dependence - Wet-chemical precipitation - ZnS:Mn Quantum dots Classification code: 933 Solid State Physics - 804.2 Inorganic Compounds - 802.3 Chemical Operations - 741.1 Light/Optics - 714.2 Semiconductor Devices and Integrated Circuits - 641.1 Thermodynamics - 543.2 Manganese and Alloys DOI: 10.4028/www.scientific.net/AMR.159.572 Database: Compendex Compilation and indexing terms, © 2012 Elsevier Inc. |
2樓2012-05-17 12:53:23
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wfw8712: 金幣+15, ★★★★★最佳答案 2012-05-17 14:22:28
wfw8712: 金幣+15, ★★★★★最佳答案 2012-05-17 14:22:28
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Accession number: 20110813685147 Title: Photoluminescence enhancement of ZnS:Mn/ZnS core/shell quantum dots Authors: Zhang, Xiao-Song1, 2 ; Li, Lan1 ; Huang, Qing-Song1 ; Zhang, Gao-Feng1 ; Xu, Jian-Ping1 ; Xuan, Rong-Wei1 ; Wei, Feng-Wei1 Author affiliation: 1 Institute of Material Physics, Tianjin University of Technology, Tianjin 300384, China 2 School of Materials Science and Engineering, Harbin Insititute of Technology, Harbin 150001, China Corresponding author: Zhang, X.-S. (zhangxiaosong@tjut.edu.cn) Source title: Guangdianzi Jiguang/Journal of Optoelectronics Laser Abbreviated source title: Guangdianzi Jiguang Volume: 22 Issue: 1 Issue date: January 2011 Publication year: 2011 Pages: 1-4 Language: Chinese ISSN: 10050086 CODEN: GUJIE9 Document type: Journal article (JA) Publisher: Board of Optronics Lasers, No. 47 Yang-Liu-Qing Ying-Jian Road, Tian-Jin City, 300380, China Abstract: ZnS:Mn and ZnS:Mn/ZnS core/shell quantum dots (QDs) were prepared in the aqueous medium from readily available precursors. The construction and luminescence properties of ZnS:Mn and ZnS:Mn/ZnS core/shell QDs were evaluated by X-ray diffraction (XRD) and photoluminescence (PL) spectra.The powder X-ray diffraction (XRD) measurements show that the ZnS:Mn and ZnS:Mn/ZnS core/shell QDs are β-ZnS structure, and the size of ZnS:Mn/ZnS core/shell QDs increases with adding ZnS shells. ZnS:Mn and ZnS:Mn/ZnS core/shell QDs both have photoluminescence at 586 nm through the 4T1-6A1 transition of Mn ions. Specially, the PL intensity of ZnS:Mn/ZnS core/shell QDs is enhanced with adding ZnS shells, and ZnS shells never lead to blue or red shift in PL spectra. It is because ZnS shells can block some non-radiative recombination routes related to the surface state of the QDs, which will increase the concentration of luminescent center and decrease the non-radiative recombination sites. The luminescence intensity of thioglycolic acid (TAG) modified ZnS:Mn QDs decreases significantly, while that of thioglycolic acid modified ZnS:Mn/ZnS QDs decreases slightly, although the stability and solubility of thioglycolic acid modified ZnS:Mn and ZnS:Mn/ZnS QDs are improved. Number of references: 16 Main heading: Zinc sulfide Controlled terms: Diffraction - Light emission - Manganese - Photoluminescence - Semiconductor quantum dots - Shells (structures) - X ray diffraction Uncontrolled terms: Aqueous medium - Core/shell - Luminescence intensity - Luminescence properties - Luminescent centers - Mn ions - Non-radiative recombinations - Photoluminescence enhancement - PL intensity - PL spectra - Powder X ray diffraction - Quantum Dot - Quantum dots - Red shift - Surface state - Thioglycolic acid - Thioglycolic acid (TAG) modified - ZnS:Mn - ZnS:Mn/ZnS Classification code: 408.2 Structural Members and Shapes - 543.2 Manganese and Alloys - 714.2 Semiconductor Devices and Integrated Circuits - 741.1 Light/Optics - 804.2 Inorganic Compounds - 931.3 Atomic and Molecular Physics Database: Compendex Compilation and indexing terms, © 2012 Elsevier Inc. |
3樓2012-05-17 12:56:57
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