Photo-Degradation Study of CdTe Nanocrystals by Fluorescence Measurement

被引：5
作者：
Yang, Ping [1 ]
Yu, Jinghua [2 ]
机构：
[1] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China
[2] Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Peoples R China
来源：
JOURNAL OF FLUORESCENCE | 2011年 / 21卷 / 05期
基金：
美国国家科学基金会;
关键词：
Nanocrystals; Photoluminescence; Photo-degradation; Silica; Film; QUANTUM DOTS; EFFICIENCY; PHOTOLUMINESCENCE; LUMINESCENCE; ENHANCEMENT; DYNAMICS; THIOLS; FILMS;
D O I：
10.1007/s10895-011-0889-0
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
The photo-degradation of green-, yellow-, orange-and red-emitting CdTe nanocrystals (NCs) in sol-gel SiO(2) films was investigated quantitatively by measuring the PL efficiency as a function of the irradiation intensity. The degradation behaviors of the NCs depended strongly on the particle size and the surface state. Green- and yellow-emitting CdTe NCs exhibited a red-shifted PL peak wavelength and decreased PL efficiency after irradiation. In contrast, the PL peak wavelength of red-emitting CdTe NCs remained unchange and their PL efficiency increased. Furthermore, the degraded degree of green-emitting NCs depended linearly on the irradiation intensity (rate constant k(1) = (1.10 +/- 0.04) x 10(-6) photon), whereas hat of red-emitting NCs showed a quadratic dependence (rate constant k(2) = (2.26 +/- 0.1) x 10(-26)(cm(2) s)/photon) at room temperature. This is ascribed to the different surface state of green- and red-emitting CdTe NCs.
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收藏
页码：1913 / 1919
页数：7
相关论文
共 21 条
  • [1] Photochemical instability of CdSe nanocrystals coated by hydrophilic thiols
    Aldana, J
    Wang, YA
    Peng, XG
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (36) : 8844 - 8850
  • [2] Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure
    Bao, HB
    Gong, YJ
    Li, Z
    Gao, MY
    [J]. CHEMISTRY OF MATERIALS, 2004, 16 (20) : 3853 - 3859
  • [3] Thiol-containing microspheres as polymeric ligands for the immobilisation of quantum dots
    Behrendt, Jonathan M.
    Afzaal, Mohammad
    Alexander, Lois M.
    Bradley, Mark
    Hine, Anna V.
    Nagel, David
    O'Brien, Paul
    Presland, Katayune
    Sutherland, Andrew J.
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2009, 19 (02) : 215 - 221
  • [4] Luminescence quantum efficiency of nanocrystalline ZnS:Mn2+.: 2.: Enhancement by UV irradiation
    Bol, AA
    Meijerink, A
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (42) : 10203 - 10209
  • [5] Photo-activated luminescence of CdSe quantum dot monolayers
    Cordero, SR
    Carson, PJ
    Estabrook, RA
    Strouse, GF
    Buratto, SK
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (51): : 12137 - 12142
  • [6] Study of fluorescence quenching and dialysis process of CdTe quantum dots, using ensemble techniques and fluorescence correlation spectroscopy
    Dong, Chaoqing
    Qian, Huifeng
    Fang, Nenghu
    Ren, Jicun
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (23) : 11069 - 11075
  • [7] Thiol-capping of CdTe nanocrystals:: An alternative to organometallic synthetic routes
    Gaponik, N
    Talapin, DV
    Rogach, AL
    Hoppe, K
    Shevchenko, EV
    Kornowski, A
    Eychmüller, A
    Weller, H
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (29) : 7177 - 7185
  • [8] Grabolle M., 2008, Anal. Chem, V81, P6285
  • [9] Harrison MT, 2000, ADV MATER, V12, P123, DOI 10.1002/(SICI)1521-4095(200001)12:2<123::AID-ADMA123>3.0.CO
  • [10] 2-H
123