The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes

被引：75

作者：

King, S. M. ^{[1
]}

Cass, M. ^{[1
]}

Pintani, M. ^{[1
]}

Coward, C. ^{[1
]}

Dias, F. B. ^{[2
]}

Monkman, A. P. ^{[2
]}

Roberts, M. ^{[1
]}

机构：

[1] Cambridge Display Technol Ltd, Cambridge CB23 6DW, England

[2] Univ Durham, Dept Phys, Durham Photon Mat Inst, Durham DH1 3LE, England

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

DEPENDENT EXCITON FORMATION; DELAYED ELECTROLUMINESCENCE; DEGRADATION; MECHANISM; DECAY;

D O I：

10.1063/1.3561430

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate that the fast initial decay of a prototypical fluorescent polymer based organic light emitting diode device is related to the contribution that triplet-triplet annihilation makes to the device efficiency. We show that, during typical operating conditions, approximately 20% of the device efficiency originates from the production of singlet excitons by triplet-triplet annihilation. During prolonged device operation, the triplet excitons are quenched much more easily than the emissive singlets; thus, the contribution to the efficiency from triplet-triplet annihilation is lost during the early stages of the device lifetest. The fast initial decay of the device luminance can be removed by incorporating a triplet quenching additive into the active layer to remove any effect of triplet-triplet annihilation; this yields an increase in the device lifetime of greater than 3x and an even more significant improvement in the initial luminance decay. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3561430]

引用

页数：5

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