A general approach for non-coherently excited annihilation up-conversion: transforming the solar-spectrum

被引：137

作者：

Baluschev, S. ^{[1
]}

Yakutkin, V. ^{[1
]}

Miteva, T. ^{[2
]}

Wegner, G. ^{[1
]}

Roberts, T. ^{[2
]}

Nelles, G. ^{[2
]}

Yasuda, A. ^{[2
]}

Chernov, S. ^{[3
]}

Aleshchenkov, S. ^{[3
]}

Cheprakov, A. ^{[3
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[2] Sony Deutschland GmbH, Mat Sci Lab, D-70327 Stuttgart, Germany

[3] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

关键词：

D O I：

10.1088/1367-2630/10/1/013007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate up-conversion with an external quantum yield of 3.2% realized at ultra-low excitation intensities (similar to 0.1 W cm(-2)). The bimolecular up-conversion process in our systems relies on the presence of a metastable triplet excited state, and thus has substantially different photophysical characteristics when compared with the other known methods for photon up-conversion (two-photon absorption, parametric processes, second harmonic generation, sequential multiphoton absorption, etc). Thus, we state the general requirements for the materials' parameters of the couple sensitizer/emitter for obtaining triplet-triplet annihilation up-conversion. One of the applications we suggest for active materials compositions is the achievement of energetically stepwise up-conversion of the terrestrial solar spectrum towards blue wavelengths: as such they could be used for improving the efficiency of the solar cells. Up-conversion with non-coherent excitation by sunlight with wavelengths between 550 and 700 nm is demonstrated.

引用

页数：12

共 28 条

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