Strong luminescence intensity modulation near a metal-organic interface

被引:6
作者
Borges, CAM
Rodrigues, CA
Faria, RM
Guimaraes, FEG
机构
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[2] Fac Ciencias & Tecnol, Feira De Santana, BA, Brazil
关键词
optical properties; photoluminescence; PPV; metal electrode effect; interface; optical interference; LIGHT-EMITTING-DIODES; SURFACES; FILMS;
D O I
10.1016/j.synthmet.2005.07.034
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The dependence of the luminescence intensity on the distance between an ultra thin PPV probe layer and a metal surface is investigated. We have employed a new Layer-by-Layer method, which allows control of layer deposition at the monolayer level. A precise variation of the metal/PPV separation over the entire substrate surface was achieved by the deposition of an inert spacer layer. A strong dependence of the PPV emission on the spacer layer and metal thickness is observed. The effect of the morphology of the metal surface is also discussed. These results are explained in terms of a competing short range radiationless energy transfer and intensity modulation due to interference effects produced by the optical cavity formed by metal and polymer films.
引用
收藏
页码:133 / 136
页数:4
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