Kinetic Analysis of Photochemical Upconversion by Triplet-Triplet Annihilation: Beyond Any Spin Statistical Limit

被引：249

作者：

Cheng, Yuen Yap ^{[1
]}

Fueckel, Burkhard ^{[1
]}

Khoury, Tony ^{[1
]}

Clady, Raphael G. C. R. ^{[1
]}

Tayebjee, Murad J. Y. ^{[1
]}

Ekins-Daukes, N. J. ^{[2
,3
]}

Crossley, Maxwell J. ^{[1
]}

Schmidt, Timothy W. ^{[1
]}

机构：

[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia

[2] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[3] Univ London Imperial Coll Sci Technol & Med, Grantham Inst Climate Change, London SW7 2AZ, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 12期

基金：

澳大利亚研究理事会;

关键词：

GENERATION; EFFICIENCY; RUBRENE;

D O I：

10.1021/jz100566u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Upconversion (UC) via triplet triplet annihilation (TTA) is a promising concept to improve the energy conversion efficiency of solar cells by harvesting photons below the energy threshold. Here, we present a. kinetic study of the delayed fluorescence induced by TTA to explore the maximum efficiency of this process. In our model system we find that more than 60% Of the triplet molecules that decay by TTA produce emitters in their first excited singlet state so that the observed TTA effiency exceeds 40% at the point of the highest triplet emitter concentration. This result 'thoroughly disproves any spin statistical limitation for the annihilation efficiency and thus has crucial consequences for the applicability of an upconvertor based on TTA', which are discussed.

引用

页码：1795 / 1799

页数：5

共 24 条

[21] Boron Dipyrromethene Chromophores: Next Generation Triplet Acceptors/Annihilators for Low Power Upconversion Schemes [J].