Effect of intramolecular energy transfer in a dual-functional molecular dyad on the performance of solution-processed TADF OLEDs.

Autor:	Kwon NY; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Kwak H; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Kim HY; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Park SH; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Park JY; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Kang MJ; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Koh CW; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Park S; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Cho MJ; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr., Choi DH; Department of Chemistry, Research Institute for Natural Sciences, Korea University 145 Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea spark8@korea.ac.kr chominju@korea.ac.kr dhchoi8803@korea.ac.kr.
Jazyk:	angličtina
Zdroj:	Chemical science [Chem Sci] 2024 Jul 06; Vol. 15 (31), pp. 12361-12368. Date of Electronic Publication: 2024 Jul 06 (Print Publication: 2024).
DOI:	10.1039/d4sc02357a
Abstrakt:	This paper introduces the design concept of a dual-functional molecular dyad tailored specifically for solution-processable organic light-emitting diodes (OLEDs). Cy-tmCPBN, characterized by an asymmetric molecular dyad structure, integrates a host unit (tmCP) and a multiple-resonance (MR) emitter (CzBN) via a non-conjugated cyclohexane linker. Cy-tmCPBN exhibited efficient intramolecular energy transfers (EnTs) from tmCP to the CzBN unit, as confirmed by time-resolved fluorescence experiments. The fluorescence lifetime of the tmCP unit was approximately three times shorter in a highly diluted solution of Cy-tmCPBN than in a mixed solution of Cy-tmCP and Cy-CzBN. In addition, Cy-tmCPBN exhibited excellent solubility and film-forming ability, making it suitable for solution processing. Notably, OLEDs utilizing Cy-tmCPBN achieved over twice the brightness and improved external quantum efficiency of 12.3% compared to OLEDs using Cy-CzBN with the same concentration of CzBN in the emitting layer. The improved OLED performance can be explained by the increased EnT efficiency from Cy-tmCP to Cy-tmCPBN and the intramolecular EnT within Cy-tmCPBN. In our dual-functional dyad, incorporating both host and emitter units in an asymmetric molecular dyad structure, we induced a positive synergy effect with the host moiety, enhancing OLED performance through intramolecular EnT. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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