Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence
Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence
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DOI：
10.1021/acs.jpcc.8b08716
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发表时间：
2018-10-04
影响因子：
3.7
通讯作者：
Dyakonov, Vladimir
中科院分区：
文献类型：
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作者：
Drigo, Nikita A.;Kudriashova, Liudmila G.;Dyakonov, Vladimir
我们设计并合成了一种新型的有机电致发光器件SBABz4，它的核心含有螺联吖啶供体(D)和两个苯腈受体(A)。双A-DxD-A结构相对于其单个A-D对应物提供纯蓝色发射。在溶液和固体薄膜的宽动态范围内记录的时间分辨光致发光(TRPL)显示了三种发射成分：瞬时荧光、磷光和高效的热激活延迟荧光(TADF)。最后，通过温度相关的TRPL和氧猝灭荧光实验独立地证明了这一点。根据光致发光寿命和量子产额，我们估计了SBABz4基OLED的最大外量子效率为7.1%，并在工作装置上验证了6.8%。
We designed and synthesized a new organic light-emitting diode (OLED) emitter, SBABz4, containing spiro-biacridine donor (D) in the core surrounded by two benzonitrile acceptors (A). The dual A-DxD-A structure is shown to provide pure-blue emission in relation to its single A-D counterpart. Time-resolved photoluminescence (TRPL) recorded in the broad dynamic range from solutions and solid films revealed three emission components: prompt fluorescence, phosphorescence, and efficient thermally activated delayed fluorescence (TADF). The last is independently proven by temperature-dependent TRPL and oxygen-quenching PL experiment. From the PL lifetimes and quantum yield, we estimated maximum external quantum efficiency of 7.1% in SBABz4-based OLEDs and demonstrated 6.8% in a working device.