共 28 条
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
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]
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页数:5
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