The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes
The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes
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DOI：
10.1063/1.3561430
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发表时间：
2011-04-01
影响因子：
3.2
通讯作者：
Roberts, M.
中科院分区：
文献类型：
--
作者：
King, S. M.;Cass, M.;Roberts, M.
我们证明了基于荧光聚合物的原型有机发光二极管器件的快速初始衰减与三重态湮灭对器件效率的贡献有关。我们表明，在典型的操作条件下，大约20%的器件效率来源于三重态-三重态湮灭产生的单重态激子。在长时间的器件工作中，三重态激子比发射的单重态激子更容易被猝灭；因此，在器件寿命测试的早期阶段，三重态-三重态湮灭对效率的贡献是损失的。可以通过在活性层中加入三重态猝灭添加剂来消除器件亮度的快速初始衰减，以消除三重态-三重态湮灭的任何影响；这使得器件寿命增加了3倍以上，并且在初始亮度衰减方面有了更显著的改善。(C) 2011年美国物理研究所。(doi: 10.1063/1.3561430)
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]