32 3 2011 3 CHINESE JOURNAL OF LUMINESCENCE Vol. 32 No. 3 Mar. 2011 1000-7032 2011 03-0227-05 CdS 221116 TEOS - CdS XRD - CdS 5. 1 nm CdS CdS 0. 5% CdS - O482. 31 PACS 78. 55. -m PACC 7855 A DOI 10. 3788 /fgxb20113203. 0227 1 - CdS 1-2 CdS CdS Ⅱ-Ⅳ 2. 42 ev CdS 2 CdS 3 CdS 2. 1 TEOS CdS Cd NO 3 2 4H 2 O CS NH 2 2 CdS 2. 2 CdS CdS 4 - Solge1 CdS 10 TEOS 5-7 Cd NO 3 2 4H 2 O SC NH 2 2 TEOS H 2 O C 2 H 5 OH HNO 3 30 min n H 2 O n TEOS 8-9 n C 2 H 5 OH n HNO 3 =1 1 4 0. 001 65 5 Cd NO 3 2 SC NH 2 2 n H 2 O 2010-08-11 2010-10-11 ON090237 1973 - E-mail xuleihua@ cumt. edu. cn Tel 0516 83591939
228 32 n TEOS n C 2 H 5 OH n HNO 3 = 4 1 4 0. 001 65 2 h 2 CdS 40 4 d CdS 2 CdS b ~ d CdS 150 2 h Cd SC NH 2 2 n NO 3 2 CdS CdS CdS 12 CdS 2. 3 CdS 2550 /maxvb /PC X Cu Kα λ = 0. 15 406 nm CdS XRD RF-5301PC 450 W 6 nm 3 nm Unico UV- 3102PCS 3 1 CdS XRD 1 a 2 b 3 2θ = 26. 5 43. 9 51. 9 CdS 111 220 311 3 11 Scherrer CdS Fig. 2 5. 1 nm CdS Absorption spectra of CdS-doped silica xerogels with different mole fraction a pure xerogel b 0. 1% CdS-doped c 0. 5% CdS-doped d 1. 0% CdS- CdS doped. Cd SC NH 2 2 n X 2 X = NO - 3 150 CdS 400 nm CdS CdS a b 0. 1% CdS- c 0. 5% CdS- d 1. 0% CdS- 1 Fig. 1 XRD a b CdS Fig. 3 XRD pattern of silica xerogels a the pure silica and b CdS-doped silica. 3 CdS a b 0. 1% CdS- c 0. 5% CdS- d 1. 0% CdS- PL spectra of silica xerogels with different CdS dopant mole fraction a pure xerogel b 0. 1% CdSdoped c 0. 5% CdS-doped d 1. 0% CdS-doped.
3 CdS 229 CdS CdS 3 CdS 460 nm CdS 19 3 13 460 nm 14 15 16 1 2 3 C 4 CdS - a b 0. 1% CdS- Si O SiO 3 Si sp 3 Si O R C O Fig. 4 - O 2p O Si O O C O different mole fraction a pure b 0. 1% CdSdoped c 0. 5% CdS-doped d 1. 0% - CdS-doped. c 0. 5 CdS% - d 1. 0% CdS- Excitation spectra of CdS-doped silica xerogels with 4 CdS Si C CdS 350 nm CdS 460 nm 650 nm 17 460 nm 380 nm - 650 CdS nm CdS CdS 350 nm 18 3 360 nm CdS 650 nm 460 nm 460 CdS 460 nm nm CdS CdS CdS 0.5% 4 - CdS 5 - CdS 5. 1 nm CdS CdS Si CdS CdS CdS 460 nm 460 nm
230 32 1 Jiang Daixun Cao Lixin Su Ge et al. Synthesis and photoluminescent properties of ZnS Mn /CdS nanoparticles with core /shell structure J. Chin. J. Lumin. 2009 30 6 832-837 in Chinese. 2 Jayanthi K Chawla S Chander H et al. Structural optical and photoluminescence properties of ZnS Cu nanoparticle thin films as a function of dopant concentration and quantum confinement effect J. Cryst. Res. Technol. 2007 42 10 976-982. 3 Gan Xinhui Liao Yuanbao Liu Dong et al. Chemical bath deposition and optical properties of CdS nanocrystalline films with tunable electronic band gap J. Chin. J. Lumin. 2008 29 6 1076-1080 in Chinese. 4 Correa-Duarte M A Giersog M Liz-Marzán L M. Stabilization of CdS semiconductor nanoparticles against photodegradation by silica coating procedure J. Chem. Phys. Lett. 1998 286 5-6 497-501. 5 Li Qiyuan Wei Changping Sun Xiaofei. Optical properties of ZnO / composite film J. Chin. J. Lumin. 2009 30 3 385-388 in Chinese. 6 Cai Jinjun Wang Yi Pan Huanhuan et al. Preparation and photoluminescence of green Zn 2 SiO 4 Mn 2 + phosphor by solgel method J. Chin. J. Lumin. 2010 31 1 75-78 in Chinese. 7 Bekiari V Lianos P. Characterization of photoluminescence from a material made by interaction of 3-aminopropyl triethoxysilane with acetic acid J. Langmuir 1998 14 13 3459-3461. 8 Zhao Limin Shao Xing Kong Ying. The design and characterization of inorganic /organic hybrid luminescence molecule materials with terbium-sulfosalieylic acid complexes J. Chin. J. Lumin. 2009 30 6 862-866 in Chinese. 9 Mu J Gu D Y Xu Z Z. Synthesis and stabilization of CdS nanoparticles embedded in silica nanospheres J. Appl. Phys. A 2005 80 7 1425-1429. 10 Rao A P Pajonk G M Rao A V. Effect of ph aging and drying on the size of CdS nanocrystallites monolithicity and transparency of nanocrystalline CdS-doped silica xerogels J. J. Mater. Synth. Proceedings 2001 9 1 11-18. 11 Wang C Y Mo X Zhou Y et al. A convenient ultraviolet irradiation technique for in situ synthesis of CdS nanocrystallites at room temperature J. J. Mater. Chem. 2000 10 3 607-609. 12 Sreekumari N P Revaprasadu N Radhakrishnana T et al. Preparation of CdS nanoparticles using the cadmium Ⅱ complex of N N'-bis thiocarbamoyl hydrazine as a simple single-source precursor J. J. Mater. Chem. 2001 11 6 1555-1557. 13 Yoldas B E. Thermochemically induced photoluminescence in sol-gel-derived oxide etworks J. J. Non-Cryst. Solids 1992 147-178 614-620. 14 García J Mondragón M A Tellez C et al. Blue emission in tetraethoxysilane and silica gels J. Mater. Chem. Phys. 1995 41 1 15-17. 15 Green W H Le K P Grey J et al. White phosphors from a silica-carboxylate sol-gel precursor that lack metal activator ions J. Science 1997 276 5320 1826-1828. 16 Han Yinhua Lin Jun. Photoluminescence of xerogels J. Chin. J. Lumin. 2002 23 3 296-300 in Chinese. 17 Murakoshi K Hosokawa H J Saitoh M et al. Preparation of size-controlled hexagonal CdS nanocrystallites and the characteristics of their surface structures J. J. Chem. Soc. 1998 94 4 579-586. 18 Mu J Gu D Gu X. Synthesis of water-soluble coprecipitate Cd x Zn 1 - x S nanoparticles J. J. Disp. Sci. Techn. 2005 26 2 193-195. 19 Yang P Song C F Liu M K. The luminescence of PbS nanoparticles embedded in sol-gel silica glass J. Chem. Phys. Lett. 2001 345 5-6 429-434.
3 CdS 231 Photoluminescent Properties of CdS Quantum Dots Doped in Silica Xerogel XU Lei-hua QIANG Ying-huai JIANG Li School of Materials Science and Engineering China University of Mining and Technology Xuzhou 221116 China Abstract The CdS nanocryticles doped silica xerogels were prepared by using the sol-gel method where tetraethoxysilane TEOS was employed as the main precursor and cadmium nitrate thiourea as start materials. The X-ray diffraction pattern indicated that silica xerogels are noncrystalline structure and the mean diameter of the CdS particles is 5. 1 nm. The PL emission spectrum of the undoped silica xerogels showed weak emission peaked at 460 nm that could be attributed to the intrinsic defect states of silica xerogel. For 0. 5% CdS-doped samples the photoluminescence intensity reached maximum. The PL excitation spectra of undoped silica xerogel show that only one peak at 350 nm is observed. For CdS-doped samples a new peak at 380 nm is observed which could be attribute to the doping CdS quantum dots. Key words silica xerogels photoluminescence CdS nanoparticles sol-gel CLC number O482. 31 PACS 78. 55. -m PACC 7855 Document code A DOI 10. 3788 /fgxb20113203. 0227 Received date 2010-08-11 櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃 E-mail fgxbt@ 126. com Tel 0431 86176862 84613407 http / /www. fgxb. org