Organic Luminescent Molecule with Energetically Equivalent Singlet and Triplet Excited States for Organic Light-Emitting Diodes
Organic Luminescent Molecule with Energetically Equivalent Singlet and Triplet Excited States for Organic Light-Emitting Diodes
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DOI：
10.1103/physrevlett.110.247401
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发表时间：
2013-06-10
影响因子：
8.6
通讯作者：
Adachi, Chihaya
中科院分区：
文献类型：
--
作者：
Sato, Keigo;Shizu, Katsuyuki;Adachi, Chihaya
我们证明了一个有机分子的单重态和三重态激发态之间的能隙几乎为零（Δ E-ST类似于0 eV）。这种分离是通过给电子的吲哚并咔唑基团和二苯三嗪受电子部分的适当组合来实现的。计算和测量的Δ E-ST分别为0.003和0.02 eV。对于掺杂膜，获得了59% +/-2%的总光致发光效率，其中45% +/-2%来自延迟组分，14% +/-2%来自即时组分。含有该分子作为发光掺杂剂的有机发光二极管表现出出乎意料的高外部电致发光效率，η（EQE）= 14% +/-1%。
We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (Delta E-ST similar to 0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured Delta E-ST were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59% +/- 2% with 45% +/- 2% from a delayed component and 14% +/- 2% from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of eta(EQE) = 14% +/- 1%.