A dendrimer emitter doped in a dendrimer host: efficient thermally activated delayed fluorescence OLEDs with fully-solution processed organic-layers†,Materials Chemistry Frontiers

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A dendrimer emitter doped in a dendrimer host: efficient thermally activated delayed fluorescence OLEDs with fully-solution processed organic-layers†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-04-03 00:00:00 , DOI: 10.1039/c7qm00579b
K. Albrecht _{1,

2,

2,

3,

4} , K. Matsuoka _{3,

5,

6} , K. Fujita _{3,

5,

6} , K. Yamamoto _{1,

2,

2,

3,

4}

Affiliation

A thermally activated delayed fluorescence (TADF) carbazole dendrimer (tBuG2TAZ) doped in a carbazole dendrimer host (G3Ph, G4Ph) was employed as an emissive layer (EML) in an OLED device with fully solution processed organic layers. Green (λ_MAX = 502 nm) emission with a maximum external efficiency (EQE_MAX) of 16.1% was achieved when tBuG2TAZ was doped in G3Ph. This value was higher than the previously reported OLED device with a neat film of tBuG2TAZ as an EML because of the higher PLQY due to suppressed concentration quenching. The TADF-active carbazole dendrimer doped in a carbazole host film shows excellent miscibility and solvent resistance to ethanol. On the other hand, when a small molecule (rubrene) was doped in the carbazole dendrimer, significant dissolution of rubrene was observed after rinsing the doped film with ethanol. This shows the importance of the solvent resistivity of a dopant emitter when another film is solution-processed onto the doped film. The “doping dendrimer in dendrimer” concept is a new concept to allow fabrication of fully solution-processed TADF OLEDs.

中文翻译：

树枝状聚合物主体中掺杂的树枝状聚合物发射体：高效的热活化延迟荧光OLED，具有经过完全溶液处理的有机层†

掺杂在咔唑树枝状聚合物主体（G3Ph，G4Ph）中的热活化延迟荧光（TADF）咔唑树枝状聚合物（t BuG2TAZ）被用作具有完全溶液处理的有机层的OLED器件中的发射层（EML）。绿色（λ _MAX与最大外部效率（EQE = 502纳米）发射_MAX时达到16.1％）吨BuG2TAZ在G3Ph掺杂。该值高于先前报道的OLED薄膜整齐的t值。BuG2TAZ作为一种EML，因为由于抑制了浓度猝灭，PLQY更高。掺杂在咔唑主体膜中的TADF活性咔唑树枝状聚合物显示出极好的可混溶性和对乙醇的耐溶剂性。另一方面，当在咔唑树枝状大分子中掺杂了小分子（钌）时，在用乙醇冲洗掺杂的膜之后观察到红荧烯的显着溶解。这表明了在将另一膜溶液处理到掺杂膜上时，掺杂剂发射极的耐溶剂性的重要性。“在树枝状聚合物中掺杂树枝状聚合物”概念是允许制造完全溶液处理的TADF OLED的新概念。

更新日期：2018-04-03

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