Nonradiative quenching of singlet excitons by polarons in π-conjugated polymers

被引:5
作者
List, EJW [1 ]
Kim, CH
Graupner, W
Leising, G
Shinar, J
机构
[1] US DOE, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA
[3] Graz Univ Technol, Inst Festkorperphys, A-8010 Graz, Austria
[4] Emagin Corp, Hopewell Jct, NY 12533 USA
[5] Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA
关键词
photoluminescence detected magnetic resonance; photoluminescence; singlet excitons; PL-quenching;
D O I
10.1016/S0379-6779(00)01463-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The photoluminescence (PL)-detected magnetic resonance (PLDMR) of various pi -conjugated materials, including poly(p-phenylene vinylenes) (PPVs), isolated PPV chains in a nano-structured liquid crystal host, methyl-substituted ladder-type poly(p-phenylene), and oligophenylenes are described. All of the results are in excellent quantitative agreement with a rate-equation model in which the positive (PL-enhancing) spin 1/2 PLDMR is due to the role of polarons in nonradiative quenching of singlet excitons. The results also suggest that this quenching process is very significant in luminescent pi -conjugated materials and organic light-emitting devices, and should be taken into account, especially at high excitation densities such as in lasing action.
引用
收藏
页码:511 / 514
页数:4
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