TY - JOUR
T1 - A dendrimer emitter doped in a dendrimer host
T2 - Efficient thermally activated delayed fluorescence OLEDs with fully-solution processed organic-layers
AU - Albrecht, K.
AU - Matsuoka, K.
AU - Fujita, K.
AU - Yamamoto, K.
N1 - Funding Information:
This work was supported by the Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials, Grant-in-Aid for Scientific Research on Innovated Areas ‘‘p-System Figuration: Control of Electron and Structural Dynamism for Innovative Functions’’, JSPS KAKENHI Grant Numbers 17H05146 and 15H05757, and by the research grant from The Murata Science Foundation.
Publisher Copyright:
© The Royal Society of Chemistry and the Chinese Chemical Society 2018.
PY - 2018
Y1 - 2018
N2 - 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 (lMAX = 502 nm) emission with a maximum external efficiency (EQEMAX) 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.
AB - 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 (lMAX = 502 nm) emission with a maximum external efficiency (EQEMAX) 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.
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U2 - 10.1039/C7QM00579B
DO - 10.1039/C7QM00579B
M3 - Article
AN - SCOPUS:85049992743
VL - 2
SP - 1097
EP - 1103
JO - Materials Chemistry Frontiers
JF - Materials Chemistry Frontiers
SN - 2052-1537
IS - 6
ER -