Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters
A multiple resonance thermally activated delayed fluorescence (MR‐TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mo...
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| Published in | Angewandte Chemie International Edition Vol. 61; no. 22; pp. e202201886 - n/a |
|---|---|
| Main Authors | , , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
WEINHEIM
Wiley
23.05.2022
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| Edition | International ed. in English |
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| Abstract | A multiple resonance thermally activated delayed fluorescence (MR‐TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono‐substituted design strategy by introducing spiro‐9,9′‐bifluorene (SBF) units with different substituted sites into the MR‐TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2–35.9 %) and narrow‐band emission (≈27 nm). Particularly, the shield‐like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3‐substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR‐TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π‐framework.
By incorporating a three‐dimensional spiro unit into multiple resonance thermally activated delayed fluorescence emitters, the device efficiency is increased to nearly 1.5 times that of the unhindered emitter. Notably, the linkage pattern with spatial interaction and hindrance can maintain the narrow FWHM and curb unfavorable redshifts at a high doping ratio. |
|---|---|
| AbstractList | A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9'-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2-35.9 %) and narrow-band emission (≈27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π-framework.A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9'-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2-35.9 %) and narrow-band emission (≈27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π-framework. A multiple resonance thermally activated delayed fluorescence (MR‐TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono‐substituted design strategy by introducing spiro‐9,9′‐bifluorene (SBF) units with different substituted sites into the MR‐TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2–35.9 %) and narrow‐band emission (≈27 nm). Particularly, the shield‐like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3‐substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR‐TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π‐framework. By incorporating a three‐dimensional spiro unit into multiple resonance thermally activated delayed fluorescence emitters, the device efficiency is increased to nearly 1.5 times that of the unhindered emitter. Notably, the linkage pattern with spatial interaction and hindrance can maintain the narrow FWHM and curb unfavorable redshifts at a high doping ratio. A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9'-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2-35.9 %) and narrow-band emission (≈27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π-framework. A multiple resonance thermally activated delayed fluorescence (MR‐TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono‐substituted design strategy by introducing spiro‐9,9′‐bifluorene ( SBF ) units with different substituted sites into the MR‐TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2–35.9 %) and narrow‐band emission (≈27 nm). Particularly, the shield‐like molecule, SF1BN , seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3‐substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR‐TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π‐framework. A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9 '-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2-35.9 %) and narrow-band emission (approximate to 27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in pi-framework. |
| ArticleNumber | 202201886 |
| Author | Feng, Zi‐Qi Zhu, Yuan‐Hao Fan, Jian Tang, Xun Liao, Liang‐Sheng Kong, Fan‐Cheng Adachi, Chihaya Jiang, Zuo‐Quan Zhou, Dong‐Ying Huang, Chen‐Chao Qu, Yang‐Kun Zheng, Qi |
| Author_xml | – sequence: 1 givenname: Yang‐Kun orcidid: 0000-0003-0241-308X surname: Qu fullname: Qu, Yang‐Kun organization: Soochow University – sequence: 2 givenname: Dong‐Ying surname: Zhou fullname: Zhou, Dong‐Ying organization: Soochow University – sequence: 3 givenname: Fan‐Cheng surname: Kong fullname: Kong, Fan‐Cheng organization: Soochow University – sequence: 4 givenname: Qi surname: Zheng fullname: Zheng, Qi organization: Soochow University – sequence: 5 givenname: Xun surname: Tang fullname: Tang, Xun organization: Kyushu University – sequence: 6 givenname: Yuan‐Hao surname: Zhu fullname: Zhu, Yuan‐Hao organization: Soochow University – sequence: 7 givenname: Chen‐Chao surname: Huang fullname: Huang, Chen‐Chao organization: Soochow University – sequence: 8 givenname: Zi‐Qi surname: Feng fullname: Feng, Zi‐Qi organization: Soochow University – sequence: 9 givenname: Jian surname: Fan fullname: Fan, Jian organization: Soochow University – sequence: 10 givenname: Chihaya surname: Adachi fullname: Adachi, Chihaya organization: Kyushu University – sequence: 11 givenname: Liang‐Sheng surname: Liao fullname: Liao, Liang‐Sheng organization: Macau University of Science and Technology – sequence: 12 givenname: Zuo‐Quan orcidid: 0000-0003-4447-2408 surname: Jiang fullname: Jiang, Zuo‐Quan email: zqjiang@suda.edu.cn organization: Soochow University |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/35293091$$D View this record in MEDLINE/PubMed |
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| Keywords | Spiro Compounds Steric Effects Fluorescence OLEDs DIODES Multiple Resonance Thermally Activated Delayed Fluorescence EMISSION |
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| PublicationPlace_xml | – name: WEINHEIM – name: Germany – name: Weinheim |
| PublicationTitle | Angewandte Chemie International Edition |
| PublicationTitleAbbrev | ANGEW CHEM INT EDIT |
| PublicationTitleAlternate | Angew Chem Int Ed Engl |
| PublicationYear | 2022 |
| Publisher | Wiley Wiley Subscription Services, Inc |
| Publisher_xml | – name: Wiley – name: Wiley Subscription Services, Inc |
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| Snippet | A multiple resonance thermally activated delayed fluorescence (MR‐TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios,... A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios,... |
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| SubjectTerms | Chemistry Chemistry, Multidisciplinary Doping Electroluminescence Emitters Fluorescence Modulation Multiple Resonance Thermally Activated Delayed Fluorescence OLEDs Physical Sciences Resonance Science & Technology Spiro Compounds Steric Effects Substitutes |
| Title | Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters |
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