A Silane‐Based Bipolar Host with High Triplet Energy for High Efficiency Deep‐Blue Phosphorescent OLEDs with Improved Device Lifetime
A high triplet energy host is developed using a silane moiety, 9‐(4‐(triphenylsilyl)dibenzo[b,d]furan‐2‐yl)‐9H‐carbazole (SiDBFCz), is designed through extensive density functional theory (DFT) calculations to obtain appropriate hole and electron injection barriers. The chemical hardness and the cha...
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Veröffentlicht in: | Chemistry : a European journal 2020-06, Vol.26 (35), p.7767-7773 |
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creator | Ko, Soo‐Byung Kang, Sunwoo Kim, Taekyung |
description | A high triplet energy host is developed using a silane moiety, 9‐(4‐(triphenylsilyl)dibenzo[b,d]furan‐2‐yl)‐9H‐carbazole (SiDBFCz), is designed through extensive density functional theory (DFT) calculations to obtain appropriate hole and electron injection barriers. The chemical hardness and the charge transport characteristics are comprehensively investigated to realize a bipolar host with high triplet energy over 2.9 eV for deep blue phosphorescent organic light‐emitting diodes (PHOLEDs). The synthesized SiDBFCz clearly exhibits the bipolar characteristics especially with emitter molecules doped. An external quantum efficiency over 19 % without any microcavity optimization is achieved thanks to the good charge balance in the SiDBFCz PHOLED. The device lifetime of the SiDBFCz PHOLED is improved more than 1000 %, compared to the unipolar control devices at an initial luminance of 500 cd m−2. The dramatic enhancement of the operational stability of the deep blue PHOLED is also thoroughly investigated in terms of electrochemical stability of host molecules in charged or excited states. The results clearly indicate that the device lifetime is strongly correlated with the bond dissociation energy and the activation energy for the bond dissociation reaction in triplet excited state.
High efficiency and dramatic improvement of device lifetime were simultaneously and successfully realized with a silane‐based bipolar host, SiDBFCz. The dramatic enhancement of the operational stability was attributed to the bond dissociation energy and the activation energy for the bond dissociation reaction in the triplet excited state. |
doi_str_mv | 10.1002/chem.202000018 |
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High efficiency and dramatic improvement of device lifetime were simultaneously and successfully realized with a silane‐based bipolar host, SiDBFCz. The dramatic enhancement of the operational stability was attributed to the bond dissociation energy and the activation energy for the bond dissociation reaction in the triplet excited state.</description><identifier>ISSN: 0947-6539</identifier><identifier>EISSN: 1521-3765</identifier><identifier>DOI: 10.1002/chem.202000018</identifier><identifier>PMID: 32129524</identifier><language>eng</language><publisher>Germany: Wiley Subscription Services, Inc</publisher><subject>bond dissociation energies ; Carbazole ; Carbazoles ; Charge transport ; Chemistry ; Density functional theory ; Electrochemistry ; Emitters ; Emitters (electron) ; Energy of dissociation ; Excitation ; Free energy ; Heat of formation ; high triplet bipolar host ; OLEDs ; Optimization ; Organic light emitting diodes ; Phosphorescence ; Quantum efficiency ; Service life assessment ; Stability ; Transport properties ; triplet excited states</subject><ispartof>Chemistry : a European journal, 2020-06, Vol.26 (35), p.7767-7773</ispartof><rights>2020 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim</rights><rights>2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3738-edd61254c47e90791ac80ff5ceb3f71c0a835b55be483af354efb8cdcdc75c503</citedby><cites>FETCH-LOGICAL-c3738-edd61254c47e90791ac80ff5ceb3f71c0a835b55be483af354efb8cdcdc75c503</cites><orcidid>0000-0001-7632-8756</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fchem.202000018$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fchem.202000018$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/32129524$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ko, Soo‐Byung</creatorcontrib><creatorcontrib>Kang, Sunwoo</creatorcontrib><creatorcontrib>Kim, Taekyung</creatorcontrib><title>A Silane‐Based Bipolar Host with High Triplet Energy for High Efficiency Deep‐Blue Phosphorescent OLEDs with Improved Device Lifetime</title><title>Chemistry : a European journal</title><addtitle>Chemistry</addtitle><description>A high triplet energy host is developed using a silane moiety, 9‐(4‐(triphenylsilyl)dibenzo[b,d]furan‐2‐yl)‐9H‐carbazole (SiDBFCz), is designed through extensive density functional theory (DFT) calculations to obtain appropriate hole and electron injection barriers. The chemical hardness and the charge transport characteristics are comprehensively investigated to realize a bipolar host with high triplet energy over 2.9 eV for deep blue phosphorescent organic light‐emitting diodes (PHOLEDs). The synthesized SiDBFCz clearly exhibits the bipolar characteristics especially with emitter molecules doped. An external quantum efficiency over 19 % without any microcavity optimization is achieved thanks to the good charge balance in the SiDBFCz PHOLED. The device lifetime of the SiDBFCz PHOLED is improved more than 1000 %, compared to the unipolar control devices at an initial luminance of 500 cd m−2. The dramatic enhancement of the operational stability of the deep blue PHOLED is also thoroughly investigated in terms of electrochemical stability of host molecules in charged or excited states. The results clearly indicate that the device lifetime is strongly correlated with the bond dissociation energy and the activation energy for the bond dissociation reaction in triplet excited state.
High efficiency and dramatic improvement of device lifetime were simultaneously and successfully realized with a silane‐based bipolar host, SiDBFCz. The dramatic enhancement of the operational stability was attributed to the bond dissociation energy and the activation energy for the bond dissociation reaction in the triplet excited state.</description><subject>bond dissociation energies</subject><subject>Carbazole</subject><subject>Carbazoles</subject><subject>Charge transport</subject><subject>Chemistry</subject><subject>Density functional theory</subject><subject>Electrochemistry</subject><subject>Emitters</subject><subject>Emitters (electron)</subject><subject>Energy of dissociation</subject><subject>Excitation</subject><subject>Free energy</subject><subject>Heat of formation</subject><subject>high triplet bipolar host</subject><subject>OLEDs</subject><subject>Optimization</subject><subject>Organic light emitting diodes</subject><subject>Phosphorescence</subject><subject>Quantum efficiency</subject><subject>Service life assessment</subject><subject>Stability</subject><subject>Transport properties</subject><subject>triplet excited states</subject><issn>0947-6539</issn><issn>1521-3765</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkT9v1DAYhy1ERa-FlRFZYmHJ1X_iczK2d4GrdKhIlNlKnNeNqyQOdtLqNla2fkY-SX1KWyQW7MGS9fh5f_IPofeULCkh7Ew30C0ZYSQumr1CCyoYTbhciddoQfJUJivB82N0EsJtRPIV52_QMWeU5YKlC_T7HH-3bdnDn18PF2WAGl_YwbWlx1sXRnxvxwZv7U2Dr70dWhhx0YO_2WPj_HxfGGO1hV7v8QZgOGjaCfC3xoWhcR6Chn7EV7tiE2bbZTd4dxcHbeDOasA7a2C0HbxFR6ZsA7x7Ok_Rj8_F9Xqb7K6-XK7Pd4nmkmcJ1PWKMpHqVEJOZE5LnRFjhIaKG0k1KTMuKiEqSDNeGi5SMFWm67il0ILwU_Rp9sYYPycIo-psDNkePsFNQTEuKU1TwrKIfvwHvXWT72M6xVIqJGMyk5FazpT2LgQPRg3edqXfK0rUoSR1KEm9lBQffHjSTlUH9Qv-3EoE8hm4ty3s_6NT623x9a_8EdztoC8</recordid><startdate>20200623</startdate><enddate>20200623</enddate><creator>Ko, Soo‐Byung</creator><creator>Kang, Sunwoo</creator><creator>Kim, Taekyung</creator><general>Wiley Subscription Services, Inc</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>K9.</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-7632-8756</orcidid></search><sort><creationdate>20200623</creationdate><title>A Silane‐Based Bipolar Host with High Triplet Energy for High Efficiency Deep‐Blue Phosphorescent OLEDs with Improved Device Lifetime</title><author>Ko, Soo‐Byung ; Kang, Sunwoo ; Kim, Taekyung</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3738-edd61254c47e90791ac80ff5ceb3f71c0a835b55be483af354efb8cdcdc75c503</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>bond dissociation energies</topic><topic>Carbazole</topic><topic>Carbazoles</topic><topic>Charge transport</topic><topic>Chemistry</topic><topic>Density functional theory</topic><topic>Electrochemistry</topic><topic>Emitters</topic><topic>Emitters (electron)</topic><topic>Energy of dissociation</topic><topic>Excitation</topic><topic>Free energy</topic><topic>Heat of formation</topic><topic>high triplet bipolar host</topic><topic>OLEDs</topic><topic>Optimization</topic><topic>Organic light emitting diodes</topic><topic>Phosphorescence</topic><topic>Quantum efficiency</topic><topic>Service life assessment</topic><topic>Stability</topic><topic>Transport properties</topic><topic>triplet excited states</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ko, Soo‐Byung</creatorcontrib><creatorcontrib>Kang, Sunwoo</creatorcontrib><creatorcontrib>Kim, Taekyung</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>MEDLINE - Academic</collection><jtitle>Chemistry : a European journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ko, Soo‐Byung</au><au>Kang, Sunwoo</au><au>Kim, Taekyung</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Silane‐Based Bipolar Host with High Triplet Energy for High Efficiency Deep‐Blue Phosphorescent OLEDs with Improved Device Lifetime</atitle><jtitle>Chemistry : a European journal</jtitle><addtitle>Chemistry</addtitle><date>2020-06-23</date><risdate>2020</risdate><volume>26</volume><issue>35</issue><spage>7767</spage><epage>7773</epage><pages>7767-7773</pages><issn>0947-6539</issn><eissn>1521-3765</eissn><abstract>A high triplet energy host is developed using a silane moiety, 9‐(4‐(triphenylsilyl)dibenzo[b,d]furan‐2‐yl)‐9H‐carbazole (SiDBFCz), is designed through extensive density functional theory (DFT) calculations to obtain appropriate hole and electron injection barriers. The chemical hardness and the charge transport characteristics are comprehensively investigated to realize a bipolar host with high triplet energy over 2.9 eV for deep blue phosphorescent organic light‐emitting diodes (PHOLEDs). The synthesized SiDBFCz clearly exhibits the bipolar characteristics especially with emitter molecules doped. An external quantum efficiency over 19 % without any microcavity optimization is achieved thanks to the good charge balance in the SiDBFCz PHOLED. The device lifetime of the SiDBFCz PHOLED is improved more than 1000 %, compared to the unipolar control devices at an initial luminance of 500 cd m−2. The dramatic enhancement of the operational stability of the deep blue PHOLED is also thoroughly investigated in terms of electrochemical stability of host molecules in charged or excited states. The results clearly indicate that the device lifetime is strongly correlated with the bond dissociation energy and the activation energy for the bond dissociation reaction in triplet excited state.
High efficiency and dramatic improvement of device lifetime were simultaneously and successfully realized with a silane‐based bipolar host, SiDBFCz. The dramatic enhancement of the operational stability was attributed to the bond dissociation energy and the activation energy for the bond dissociation reaction in the triplet excited state.</abstract><cop>Germany</cop><pub>Wiley Subscription Services, Inc</pub><pmid>32129524</pmid><doi>10.1002/chem.202000018</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0001-7632-8756</orcidid></addata></record> |
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subjects | bond dissociation energies Carbazole Carbazoles Charge transport Chemistry Density functional theory Electrochemistry Emitters Emitters (electron) Energy of dissociation Excitation Free energy Heat of formation high triplet bipolar host OLEDs Optimization Organic light emitting diodes Phosphorescence Quantum efficiency Service life assessment Stability Transport properties triplet excited states |
title | A Silane‐Based Bipolar Host with High Triplet Energy for High Efficiency Deep‐Blue Phosphorescent OLEDs with Improved Device Lifetime |
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