TY - JOUR
T1 - Facile dimerization strategy for producing narrowband green multi-resonance delayed fluorescence emitters
AU - Yang, Minlang
AU - Konidena, Rajendra Kumar
AU - Shikita, So
AU - Yasuda, Takuma
N1 - Funding Information:
This work was supported in part by Grant-in-Aid for JSPS KAKENHI (Grant No. JP21H04694 and JP22F21030), JST CREST (Grant No. JPMJCR21O5), and the Mitsubishi Foundation. R. K. K. acknowledges the JSPS Postdoctoral Fellowships for Research in Japan. The authors are grateful for the support provided by the Cooperative Research Program of “Network Joint Center for Materials and Devices” and the computer facilities at the Research Institute for Information Technology, Kyushu University.
Publisher Copyright:
© 2022 The Royal Society of Chemistry.
PY - 2022
Y1 - 2022
N2 - Establishing a simple molecular design strategy for enabling redshifted emissions while maintaining high color purity in multi-resonance thermally activated delayed fluorescence (MR-TADF) remains a crucial yet challenging task. Herein, we introduce a new design concept based on a dimerization strategy for constructing pure green MR-TADF emitters. Two isomeric MR dimers, namely p-CzB and m-CzB, were developed by tethering two MR fragments through different linking positions. The interconnection mode between the two MR fragments in these dimeric MR-TADF systems plays a vital role in regulating photophysical properties as well as exciton dynamics. Comprehensive photophysical and computational studies revealed that m-CzB exhibits superior green MR-TADF characteristics compared to p-CzB. A m-CzB-based organic light-emitting diode (OLED) delivered pure green electroluminescence with CIE coordinates of (0.20, 0.70), a maximum external quantum efficiency of 23.5%, and alleviated efficiency roll-off.
AB - Establishing a simple molecular design strategy for enabling redshifted emissions while maintaining high color purity in multi-resonance thermally activated delayed fluorescence (MR-TADF) remains a crucial yet challenging task. Herein, we introduce a new design concept based on a dimerization strategy for constructing pure green MR-TADF emitters. Two isomeric MR dimers, namely p-CzB and m-CzB, were developed by tethering two MR fragments through different linking positions. The interconnection mode between the two MR fragments in these dimeric MR-TADF systems plays a vital role in regulating photophysical properties as well as exciton dynamics. Comprehensive photophysical and computational studies revealed that m-CzB exhibits superior green MR-TADF characteristics compared to p-CzB. A m-CzB-based organic light-emitting diode (OLED) delivered pure green electroluminescence with CIE coordinates of (0.20, 0.70), a maximum external quantum efficiency of 23.5%, and alleviated efficiency roll-off.
UR - http://www.scopus.com/inward/record.url?scp=85144028604&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85144028604&partnerID=8YFLogxK
U2 - 10.1039/d2tc04447a
DO - 10.1039/d2tc04447a
M3 - Article
AN - SCOPUS:85144028604
SN - 2050-7526
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
ER -