A dendrimer emitter doped in a dendrimer host: Efficient thermally activated delayed fluorescence OLEDs with fully-solution processed organic-layers

Ken Albrecht, K. Matsuoka, Katsuhiko Fujita, K. Yamamoto

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12 Citations (Scopus)

Abstract

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 (l 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.

Original languageEnglish
Pages (from-to)1097-1103
Number of pages7
JournalMaterials Chemistry Frontiers
Volume2
Issue number6
DOIs
Publication statusPublished - Jan 1 2018

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Dendrimers
Organic light emitting diodes (OLED)
Fluorescence
Ethanol
Doping (additives)
Quenching
Dissolution
Solubility
carbazole
Fabrication
Molecules

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Materials Science(all)

Cite this

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title = "A dendrimer emitter doped in a dendrimer host: Efficient thermally activated delayed fluorescence OLEDs with fully-solution processed organic-layers",
abstract = "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 (l 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.",
author = "Ken Albrecht and K. Matsuoka and Katsuhiko Fujita and K. Yamamoto",
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AU - Yamamoto, K.

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