Synthesis and Photophysical Properties of an Eu(II)-Complex/PS Blend: Role of Ag Nanoparticles in Surface-Enhanced Luminescence

Title
Synthesis and Photophysical Properties of an Eu(II)-Complex/PS Blend: Role of Ag Nanoparticles in Surface-Enhanced Luminescence
Author(s)
손영구김종문[김종문]정용광[정용광]강준길[강준길]
Keywords
FLUORESCENCE ENHANCEMENT; SILVER NANOPARTICLES; CROWN-ETHERS; COMPLEXES; EARTH; FABRICATION; PARTICLES; SYSTEMS; DESIGN; MATRIX
Issue Date
201206
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.28, no.25, pp.9842 - 9848
Abstract
A novel Eu(II) complex with 2-ethylhexyl hydrogen 2-ethylhexyl phosphonate (EHHEHP or PC88A) was synthesized and blended with polystyrene polymer (PS). Both an independent complex and the Eu(II)/PS blend excited by near-UV light produced blue luminescence, arising from the 5d -> 4f transitions of Eu(II). Time-dependent density functional theory (TD-DFT) calculations on electronic structures of the complex molecule indicated that the absorbing and emitting center was associated with the (2)A(d(z)(2)) state under the C-2 crystal field. We also synthesized silver nanoparticles (Ag NPs) with an average particle size of 4.48 nm (sigma = 0.91 nm) using EHHEHP as a stabilizer. The effects of Ag NPs as a colloidal suspension and an interfacial layer on the luminescence intensity of the blend were investigated as functions of the concentration of Ag NPs and the thickness of the Ag NP layer, respectively. The critical concentration of the colloidal Ag NPs and the critical thickness of the interfacial Ag NP layer were similar to 355 ppm and similar to 0.16 mu m, respectively. Under critical conditions, the Ag NPs increased the luminescence intensity by 4.4 times as a colloidal suspension in CH2Cl2 and 2.2 times as an interfacial-layer state.
URI
http://hdl.handle.net/YU.REPOSITORY/28084http://dx.doi.org/10.1021/la301547z
ISSN
0743-7463
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이과대학 > 화학생화학부 > Articles
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