Modulation of π-linkers in asymmetric thermally activated delayed fluorescence molecules enabling high performance OLEDs
The role of aromatic π bridges (called π-linkers), which are used to connect multiple D and A groups in asymmetric thermally activated delayed fluorescence (TADF) emitters, remains a critical issue for the development of high-efficiency organic light-emitting diodes (OLEDs). In this work, based on o...
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| Veröffentlicht in: | Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2020-03, Vol.8 (11), p.3663-3668 |
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| container_title | Journal of materials chemistry. C, Materials for optical and electronic devices |
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| creator | Wei, Weichun Yang, Zhan Chen, Xiaojie Liu, Tiantian Mao, Zhu Zhao, Juan Chi, Zhenguo |
| description | The role of aromatic π bridges (called π-linkers), which are used to connect multiple D and A groups in asymmetric thermally activated delayed fluorescence (TADF) emitters, remains a critical issue for the development of high-efficiency organic light-emitting diodes (OLEDs). In this work, based on our previous asymmetric TADF emitter (
SCP
) with electron donors carbazole (D) and phenothiazine (D′), we introduced different numbers of phenyl rings as π-linkers on both sides of
SCP
, leading to four D-A-D′ TADF emitters (
PCz
,
2PCz
,
PSz
, and
2PSz
) with different levels of conjugation. Experimental and theoretical results reveal that the π-linker distance has a significant effect on excited state regulation and thereby the optoelectronic properties. In comparison, the TADF emitters (
PCz
, and
PSz
) with shorter π-linkers exhibit higher photoluminescence quantum yields, due to effective suppression of conformation changes between ground state and excited state, and consequently higher device performance with external quantum efficiencies (EQEs) ranging from 20% to 30% achieved. This work provides an insight into the relationship between molecular design and optoelectronic properties of asymmetric TADF emitters.
Modulating aromatic π-linkers in asymmetric thermally activated delayed fluorescence emitters enables high performance OLEDs. |
| doi_str_mv | 10.1039/c9tc06608j |
| format | Article |
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SCP
) with electron donors carbazole (D) and phenothiazine (D′), we introduced different numbers of phenyl rings as π-linkers on both sides of
SCP
, leading to four D-A-D′ TADF emitters (
PCz
,
2PCz
,
PSz
, and
2PSz
) with different levels of conjugation. Experimental and theoretical results reveal that the π-linker distance has a significant effect on excited state regulation and thereby the optoelectronic properties. In comparison, the TADF emitters (
PCz
, and
PSz
) with shorter π-linkers exhibit higher photoluminescence quantum yields, due to effective suppression of conformation changes between ground state and excited state, and consequently higher device performance with external quantum efficiencies (EQEs) ranging from 20% to 30% achieved. This work provides an insight into the relationship between molecular design and optoelectronic properties of asymmetric TADF emitters.
Modulating aromatic π-linkers in asymmetric thermally activated delayed fluorescence emitters enables high performance OLEDs.</description><identifier>ISSN: 2050-7526</identifier><identifier>EISSN: 2050-7534</identifier><identifier>DOI: 10.1039/c9tc06608j</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Asymmetry ; Carbazoles ; Conjugation ; Crystallography ; Donors (electronic) ; Emitters ; Emitters (electron) ; Excitation ; Fluorescence ; Optoelectronics ; Organic light emitting diodes ; Partially stabilized zirconia ; Photoluminescence ; Zirconium dioxide</subject><ispartof>Journal of materials chemistry. C, Materials for optical and electronic devices, 2020-03, Vol.8 (11), p.3663-3668</ispartof><rights>Copyright Royal Society of Chemistry 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c307t-b67a60fc962748b6cf606b5ff9fe7e615a3a78b234d3f4ec444e86a31d3201a53</citedby><cites>FETCH-LOGICAL-c307t-b67a60fc962748b6cf606b5ff9fe7e615a3a78b234d3f4ec444e86a31d3201a53</cites><orcidid>0000-0003-4489-3595 ; 0000-0002-3308-6731 ; 0000-0001-9772-5363</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Wei, Weichun</creatorcontrib><creatorcontrib>Yang, Zhan</creatorcontrib><creatorcontrib>Chen, Xiaojie</creatorcontrib><creatorcontrib>Liu, Tiantian</creatorcontrib><creatorcontrib>Mao, Zhu</creatorcontrib><creatorcontrib>Zhao, Juan</creatorcontrib><creatorcontrib>Chi, Zhenguo</creatorcontrib><title>Modulation of π-linkers in asymmetric thermally activated delayed fluorescence molecules enabling high performance OLEDs</title><title>Journal of materials chemistry. C, Materials for optical and electronic devices</title><description>The role of aromatic π bridges (called π-linkers), which are used to connect multiple D and A groups in asymmetric thermally activated delayed fluorescence (TADF) emitters, remains a critical issue for the development of high-efficiency organic light-emitting diodes (OLEDs). In this work, based on our previous asymmetric TADF emitter (
SCP
) with electron donors carbazole (D) and phenothiazine (D′), we introduced different numbers of phenyl rings as π-linkers on both sides of
SCP
, leading to four D-A-D′ TADF emitters (
PCz
,
2PCz
,
PSz
, and
2PSz
) with different levels of conjugation. Experimental and theoretical results reveal that the π-linker distance has a significant effect on excited state regulation and thereby the optoelectronic properties. In comparison, the TADF emitters (
PCz
, and
PSz
) with shorter π-linkers exhibit higher photoluminescence quantum yields, due to effective suppression of conformation changes between ground state and excited state, and consequently higher device performance with external quantum efficiencies (EQEs) ranging from 20% to 30% achieved. This work provides an insight into the relationship between molecular design and optoelectronic properties of asymmetric TADF emitters.
Modulating aromatic π-linkers in asymmetric thermally activated delayed fluorescence emitters enables high performance OLEDs.</description><subject>Asymmetry</subject><subject>Carbazoles</subject><subject>Conjugation</subject><subject>Crystallography</subject><subject>Donors (electronic)</subject><subject>Emitters</subject><subject>Emitters (electron)</subject><subject>Excitation</subject><subject>Fluorescence</subject><subject>Optoelectronics</subject><subject>Organic light emitting diodes</subject><subject>Partially stabilized zirconia</subject><subject>Photoluminescence</subject><subject>Zirconium dioxide</subject><issn>2050-7526</issn><issn>2050-7534</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LxDAUxIMouOhevAsRb0I1bdo0PUpd_7Gyl_Vc0vRlt2va1KQVevMb-pXMurLefJd5MD9mYBA6C8l1SGh2I7NeEsYI3xygSUQSEqQJjQ_3f8SO0dS5DfHHQ8ZZNkHji6kGLfratNgo_PUZ6Lp9A-tw3WLhxqaB3tYS92uwjdB6xEL29YfoocIVaDF6VXowFpyEVgJujAY5aHAYWlH6sBVe16s17sAq4yO2zGI-u3On6EgJ7WD6qyfo9X62zB-D-eLhKb-dB5KStA9KlgpGlMxYlMa8ZFIxwspEqUxBCixMBBUpLyMaV1TFIOM4Bs4EDSsakVAk9ARd7nI7a94HcH2xMYNtfWUR0ZRzRtOMeupqR0lrnLOgis7WjbBjEZJiu26RZ8v8Z91nD5_vYOvknvtb3_sX__lFVyn6DS43hJs</recordid><startdate>20200321</startdate><enddate>20200321</enddate><creator>Wei, Weichun</creator><creator>Yang, Zhan</creator><creator>Chen, Xiaojie</creator><creator>Liu, Tiantian</creator><creator>Mao, Zhu</creator><creator>Zhao, Juan</creator><creator>Chi, Zhenguo</creator><general>Royal Society of Chemistry</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-4489-3595</orcidid><orcidid>https://orcid.org/0000-0002-3308-6731</orcidid><orcidid>https://orcid.org/0000-0001-9772-5363</orcidid></search><sort><creationdate>20200321</creationdate><title>Modulation of π-linkers in asymmetric thermally activated delayed fluorescence molecules enabling high performance OLEDs</title><author>Wei, Weichun ; Yang, Zhan ; Chen, Xiaojie ; Liu, Tiantian ; Mao, Zhu ; Zhao, Juan ; Chi, Zhenguo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c307t-b67a60fc962748b6cf606b5ff9fe7e615a3a78b234d3f4ec444e86a31d3201a53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Asymmetry</topic><topic>Carbazoles</topic><topic>Conjugation</topic><topic>Crystallography</topic><topic>Donors (electronic)</topic><topic>Emitters</topic><topic>Emitters (electron)</topic><topic>Excitation</topic><topic>Fluorescence</topic><topic>Optoelectronics</topic><topic>Organic light emitting diodes</topic><topic>Partially stabilized zirconia</topic><topic>Photoluminescence</topic><topic>Zirconium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wei, Weichun</creatorcontrib><creatorcontrib>Yang, Zhan</creatorcontrib><creatorcontrib>Chen, Xiaojie</creatorcontrib><creatorcontrib>Liu, Tiantian</creatorcontrib><creatorcontrib>Mao, Zhu</creatorcontrib><creatorcontrib>Zhao, Juan</creatorcontrib><creatorcontrib>Chi, Zhenguo</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of materials chemistry. C, Materials for optical and electronic devices</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wei, Weichun</au><au>Yang, Zhan</au><au>Chen, Xiaojie</au><au>Liu, Tiantian</au><au>Mao, Zhu</au><au>Zhao, Juan</au><au>Chi, Zhenguo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Modulation of π-linkers in asymmetric thermally activated delayed fluorescence molecules enabling high performance OLEDs</atitle><jtitle>Journal of materials chemistry. C, Materials for optical and electronic devices</jtitle><date>2020-03-21</date><risdate>2020</risdate><volume>8</volume><issue>11</issue><spage>3663</spage><epage>3668</epage><pages>3663-3668</pages><issn>2050-7526</issn><eissn>2050-7534</eissn><abstract>The role of aromatic π bridges (called π-linkers), which are used to connect multiple D and A groups in asymmetric thermally activated delayed fluorescence (TADF) emitters, remains a critical issue for the development of high-efficiency organic light-emitting diodes (OLEDs). In this work, based on our previous asymmetric TADF emitter (
SCP
) with electron donors carbazole (D) and phenothiazine (D′), we introduced different numbers of phenyl rings as π-linkers on both sides of
SCP
, leading to four D-A-D′ TADF emitters (
PCz
,
2PCz
,
PSz
, and
2PSz
) with different levels of conjugation. Experimental and theoretical results reveal that the π-linker distance has a significant effect on excited state regulation and thereby the optoelectronic properties. In comparison, the TADF emitters (
PCz
, and
PSz
) with shorter π-linkers exhibit higher photoluminescence quantum yields, due to effective suppression of conformation changes between ground state and excited state, and consequently higher device performance with external quantum efficiencies (EQEs) ranging from 20% to 30% achieved. This work provides an insight into the relationship between molecular design and optoelectronic properties of asymmetric TADF emitters.
Modulating aromatic π-linkers in asymmetric thermally activated delayed fluorescence emitters enables high performance OLEDs.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/c9tc06608j</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0003-4489-3595</orcidid><orcidid>https://orcid.org/0000-0002-3308-6731</orcidid><orcidid>https://orcid.org/0000-0001-9772-5363</orcidid></addata></record> |
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| source | Royal Society Of Chemistry Journals 2008- |
| subjects | Asymmetry Carbazoles Conjugation Crystallography Donors (electronic) Emitters Emitters (electron) Excitation Fluorescence Optoelectronics Organic light emitting diodes Partially stabilized zirconia Photoluminescence Zirconium dioxide |
| title | Modulation of π-linkers in asymmetric thermally activated delayed fluorescence molecules enabling high performance OLEDs |
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