Design for White Light Emitting CdS Quantum Dots Devices Enhanced by Silver Nanoparticles
-
摘要: 半导体量子点材料由于其量子尺寸效应和表面效应的影响，显示出独特的发光特性.表面等离子体荧光增强效应由于其广泛的应用前景近年来成为了研究的热点，在材料科学、生物医学、光电器件等领域都展现了良好的应用前景.本文在十八烯体系中合成CdS量子点，用光诱导法制备银纳米粒子，并将两者复合，制备成四种复合样品，通过分析复合样品的荧光谱，研究银纳米颗粒的表面等离子体共振峰分别对应富含缺陷的硫化镉量子点的带边荧光峰和表面态荧光峰时，会发生带边荧光淬灭而表面态荧光增强的现象.实验结果表明，通过控制金属和量子点之间的距离，能够控制带边荧光辐射和缺陷带荧光辐射的比例，从而控制白光量子点的色温.本文随后用九个395nm紫光LED作为激发光源，将涂有荧光样品的玻片与激发光源组装，并用锡纸挡住多余的激发光，研制出银纳米颗粒/量子点复合结构白光照明器件原型，用实物对比图证明了银纳米粒子能够改变CdS量子点样品发光颜色，增强CdS量子点的荧光效应,且增强程度随着量子点样品的厚度减小而加强的特性.该研究不仅为人们认识荧光物质和金属之间的相互作用提供了新途径，还探讨了该器件在变色发光材料方向的应用前景.
-
关键词:
- 荧光增强
Abstract: Semiconductor quantum dots have unique optical properties due to the quantum size effect and surface effect. Investigations of SPR effects on light-emitting materials and devices have increased in this decade because of their promising applications in the enhancement of the luminescence efficiency，which has demonstrated a good application prospect in the materials science, biomedicine, optoelectronic devices and other fields. In our work, we prepare trap-rich CdS nanocrystals in the oleic system, and prepare Ag nanoparticles with light induced, then combine them into four kinds of composite samples to investigate the phenomenon that Ag nanoparticles always quench the band-edge emission and enhance the surface-state emission regardless of the SPR wavelength. Experimental results show that we can change the color of?quantum?dots fluorescence because the proportion of the band-edge emission and the surface-state emission can be controlled by the distance between CdS quantum dots and silver nanoparticles. Then a white light Emitting CdS quantum dots devices enhanced by silver nanoparticles is designed using nine 395 - nm wavelength violet-LEDs as excitation?light?source, CdS quantum dots/silver nanoparticles samples and tinfoil which can block the extra light. From the picture of real products, it shows that Ag nanoparticles can change the color of?quantum?dots fluorescence and enhance the photoluminescence which will become stronger when CdS quantum dots and Ag nanoparticles come closer. This investigation not only provides a new approach to study the interaction between fluorescent?material and metal, but also discuss the devices promising application in color-changed luminescent?materials.-
Keywords:
- photoluminescence enhancement
-
-
[1] 张立德．纳米材料[M]．北京: 化学工业出版社, 2000.
[2]徐沛.银纳米颗粒选择性增强富含缺陷硫化镉量子点表面态荧光的研究[D]. 华南师范大学信息光电子科技学院，2013.
[3]YU W W.Formation of High-Quality CdS and Other II–VI Semiconductor Nanocrystals in Noncoordinating Solvents: Tunable Reactivity of Monomers[J].Angew Chem Int Ed, 2002, 41(4):2368-2369
[4]Jin RC, CAO Y W, MIRKIN C A, KELLY K L, SCHATZ G C, ZHENG J G .Photoinduced Conversion of Silver Nanospheres to Nanoprisms[J].Science, 2001, 294(2):1901-1903
[5]Li X L,Zhang J H,Xu W Q,JIA H Y,WANG X,YANG B,ZHAO B,Li B F,OZAKI Y .Mercaptoacetic Acid-Capped Silver Nanoparticles Colloid: Formation, Morphology, and SERS Activity[J].Langmuir, 2003, 19(3):4285-4290
[6]SADEGHI S M, .A Nejat Abrupt Plasmonic Activation of Photoionization Rates in Quantum Dot Solids[J].J. Phys. Chem. C, 2011, 115(2):21584-21591
[7]郭绍宁.胶体硫化镉量子点的制备及其表面态发光性质的研究[D]. 华南师范大学信息光电子科技学院，2011.
[8]YEH D M, HUANG C F,LU Y C,YANG C C.White-light light-emitting device based on surface plasmon-enhanced CdSe/ZnS nanocrystal wavelength conversion on a blue/green two-color light-emitting diode[J].Appl. Phys. Lett., 2008, 92(3):091-112
[9]CICEK N,NIZAMUGLU S, OZEL T, MUTLUGUN E, KARAKEY D U, LESNYAK V, OTTO T, DWMIR H. V. .Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers[J].Appl. Phys. Lett, 2009, 94(4):105-106
[10]CHANYAWADEE S, LAGOUDAKIS P G, HARLEY R T, CHARLTON M D, TALAPIN D V, HUANG H W, LIN C H.Increased Color-Conversion Efficienc y in Hybrid Light-Emitting Diodes utilizing Non-Radiative Energy Transfer[J].Adv. Mater, 2010, 22(2):602-606
[1] 张立德．纳米材料[M]．北京: 化学工业出版社, 2000.
[2]徐沛.银纳米颗粒选择性增强富含缺陷硫化镉量子点表面态荧光的研究[D]. 华南师范大学信息光电子科技学院，2013.
[3]YU W W.Formation of High-Quality CdS and Other II–VI Semiconductor Nanocrystals in Noncoordinating Solvents: Tunable Reactivity of Monomers[J].Angew Chem Int Ed, 2002, 41(4):2368-2369
[4]Jin RC, CAO Y W, MIRKIN C A, KELLY K L, SCHATZ G C, ZHENG J G .Photoinduced Conversion of Silver Nanospheres to Nanoprisms[J].Science, 2001, 294(2):1901-1903
[5]Li X L,Zhang J H,Xu W Q,JIA H Y,WANG X,YANG B,ZHAO B,Li B F,OZAKI Y .Mercaptoacetic Acid-Capped Silver Nanoparticles Colloid: Formation, Morphology, and SERS Activity[J].Langmuir, 2003, 19(3):4285-4290
[6]SADEGHI S M, .A Nejat Abrupt Plasmonic Activation of Photoionization Rates in Quantum Dot Solids[J].J. Phys. Chem. C, 2011, 115(2):21584-21591
[7]郭绍宁.胶体硫化镉量子点的制备及其表面态发光性质的研究[D]. 华南师范大学信息光电子科技学院，2011.
[8]YEH D M, HUANG C F,LU Y C,YANG C C.White-light light-emitting device based on surface plasmon-enhanced CdSe/ZnS nanocrystal wavelength conversion on a blue/green two-color light-emitting diode[J].Appl. Phys. Lett., 2008, 92(3):091-112
[9]CICEK N,NIZAMUGLU S, OZEL T, MUTLUGUN E, KARAKEY D U, LESNYAK V, OTTO T, DWMIR H. V. .Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers[J].Appl. Phys. Lett, 2009, 94(4):105-106
[10]CHANYAWADEE S, LAGOUDAKIS P G, HARLEY R T, CHARLTON M D, TALAPIN D V, HUANG H W, LIN C H.Increased Color-Conversion Efficienc y in Hybrid Light-Emitting Diodes utilizing Non-Radiative Energy Transfer[J].Adv. Mater, 2010, 22(2):602-606
计量
- 文章访问数: 926
- HTML全文浏览量: 86
- PDF下载量: 319
下载:
