Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs
Impedance spectroscopy is a powerful and nondestructive tool for studying charge carrier dynamics in quantum dot light-emitting diodes (QLEDs). We report here that QLEDs exhibit unique capacitance behavior that strongly depends on the ligand chemistry of the quantum dots (QDs). At low frequencies an...
Gespeichert in:
Veröffentlicht in: | Journal of applied physics 2019-05, Vol.125 (19) |
---|---|
Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | |
---|---|
container_issue | 19 |
container_start_page | |
container_title | Journal of applied physics |
container_volume | 125 |
creator | Blauth, Christian Mulvaney, Paul Hirai, Tadahiko |
description | Impedance spectroscopy is a powerful and nondestructive tool for studying charge carrier dynamics in quantum dot light-emitting diodes (QLEDs). We report here that QLEDs exhibit unique capacitance behavior that strongly depends on the ligand chemistry of the quantum dots (QDs). At low frequencies and under bipolar injection, the capacitance of the QLEDs becomes negative before it returns to positive values at even lower frequencies. This behavior is fundamentally different from that observed in organic light-emitting diodes and is attributed to the accumulation of charge carriers within the ligand shells during operation. The capacitive response depends on both the conductivity and the length of the QD ligands and can be used as a diagnostic tool for understanding the luminescent recombination efficiency of a QLED. We find that short and conductive ligands result in positive device capacitances only and this correlates with enhanced device efficiency. |
doi_str_mv | 10.1063/1.5088177 |
format | Article |
fullrecord | <record><control><sourceid>proquest_scita</sourceid><recordid>TN_cdi_scitation_primary_10_1063_1_5088177</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2228349334</sourcerecordid><originalsourceid>FETCH-LOGICAL-c327t-c3387314fa0d6da01e758c15132b44d832814a7e9848d63eb6ae477da21a51b93</originalsourceid><addsrcrecordid>eNqd0E1LAzEQBuAgCtbqwX8Q8KSwmkmym-xRav2Aohf1GmY32bKl3WyTbMF_75YWvHuZuTwzw7yEXAO7B1aIB7jPmdag1AmZANNlpvKcnZIJYxwyXarynFzEuGIMQItyQr7f3RJTu3O0xh7rNmFXO4qRIrUtLjsfU1vT5P2aNj7Q4Gq_qdpuHPEdbTvaD6FfO7odsEvDhlqf6GL-FC_JWYPr6K6OfUq-nuefs9ds8fHyNntcZLXgKo1VaCVANshsYZGBU7muIQfBKymtFlyDROVKLbUthKsKdFIpixwwh6oUU3Jz2NsHvx1cTGblh9CNJw3nXAtZCiFHdXtQdfAxBteYPrQbDD8GmNnHZsAcYxvt3cHGfRj7N_-Hdz78QdPbRvwCCHF6dw</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2228349334</pqid></control><display><type>article</type><title>Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs</title><source>American Institute of Physics (AIP) Journals</source><source>Alma/SFX Local Collection</source><creator>Blauth, Christian ; Mulvaney, Paul ; Hirai, Tadahiko</creator><creatorcontrib>Blauth, Christian ; Mulvaney, Paul ; Hirai, Tadahiko</creatorcontrib><description>Impedance spectroscopy is a powerful and nondestructive tool for studying charge carrier dynamics in quantum dot light-emitting diodes (QLEDs). We report here that QLEDs exhibit unique capacitance behavior that strongly depends on the ligand chemistry of the quantum dots (QDs). At low frequencies and under bipolar injection, the capacitance of the QLEDs becomes negative before it returns to positive values at even lower frequencies. This behavior is fundamentally different from that observed in organic light-emitting diodes and is attributed to the accumulation of charge carriers within the ligand shells during operation. The capacitive response depends on both the conductivity and the length of the QD ligands and can be used as a diagnostic tool for understanding the luminescent recombination efficiency of a QLED. We find that short and conductive ligands result in positive device capacitances only and this correlates with enhanced device efficiency.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.5088177</identifier><identifier>CODEN: JAPIAU</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; Capacitance ; Current carriers ; Diagnostic software ; Diagnostic systems ; Ligands ; Light emitting diodes ; Organic chemistry ; Organic light emitting diodes ; Quantum dots</subject><ispartof>Journal of applied physics, 2019-05, Vol.125 (19)</ispartof><rights>Author(s)</rights><rights>2019 Author(s). Published under license by AIP Publishing.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c327t-c3387314fa0d6da01e758c15132b44d832814a7e9848d63eb6ae477da21a51b93</citedby><cites>FETCH-LOGICAL-c327t-c3387314fa0d6da01e758c15132b44d832814a7e9848d63eb6ae477da21a51b93</cites><orcidid>0000-0002-2674-3262 ; 0000-0002-8007-3247 ; 0000-0001-7189-1195</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/jap/article-lookup/doi/10.1063/1.5088177$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>314,776,780,790,4498,27901,27902,76127</link.rule.ids></links><search><creatorcontrib>Blauth, Christian</creatorcontrib><creatorcontrib>Mulvaney, Paul</creatorcontrib><creatorcontrib>Hirai, Tadahiko</creatorcontrib><title>Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs</title><title>Journal of applied physics</title><description>Impedance spectroscopy is a powerful and nondestructive tool for studying charge carrier dynamics in quantum dot light-emitting diodes (QLEDs). We report here that QLEDs exhibit unique capacitance behavior that strongly depends on the ligand chemistry of the quantum dots (QDs). At low frequencies and under bipolar injection, the capacitance of the QLEDs becomes negative before it returns to positive values at even lower frequencies. This behavior is fundamentally different from that observed in organic light-emitting diodes and is attributed to the accumulation of charge carriers within the ligand shells during operation. The capacitive response depends on both the conductivity and the length of the QD ligands and can be used as a diagnostic tool for understanding the luminescent recombination efficiency of a QLED. We find that short and conductive ligands result in positive device capacitances only and this correlates with enhanced device efficiency.</description><subject>Applied physics</subject><subject>Capacitance</subject><subject>Current carriers</subject><subject>Diagnostic software</subject><subject>Diagnostic systems</subject><subject>Ligands</subject><subject>Light emitting diodes</subject><subject>Organic chemistry</subject><subject>Organic light emitting diodes</subject><subject>Quantum dots</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqd0E1LAzEQBuAgCtbqwX8Q8KSwmkmym-xRav2Aohf1GmY32bKl3WyTbMF_75YWvHuZuTwzw7yEXAO7B1aIB7jPmdag1AmZANNlpvKcnZIJYxwyXarynFzEuGIMQItyQr7f3RJTu3O0xh7rNmFXO4qRIrUtLjsfU1vT5P2aNj7Q4Gq_qdpuHPEdbTvaD6FfO7odsEvDhlqf6GL-FC_JWYPr6K6OfUq-nuefs9ds8fHyNntcZLXgKo1VaCVANshsYZGBU7muIQfBKymtFlyDROVKLbUthKsKdFIpixwwh6oUU3Jz2NsHvx1cTGblh9CNJw3nXAtZCiFHdXtQdfAxBteYPrQbDD8GmNnHZsAcYxvt3cHGfRj7N_-Hdz78QdPbRvwCCHF6dw</recordid><startdate>20190521</startdate><enddate>20190521</enddate><creator>Blauth, Christian</creator><creator>Mulvaney, Paul</creator><creator>Hirai, Tadahiko</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-2674-3262</orcidid><orcidid>https://orcid.org/0000-0002-8007-3247</orcidid><orcidid>https://orcid.org/0000-0001-7189-1195</orcidid></search><sort><creationdate>20190521</creationdate><title>Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs</title><author>Blauth, Christian ; Mulvaney, Paul ; Hirai, Tadahiko</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c327t-c3387314fa0d6da01e758c15132b44d832814a7e9848d63eb6ae477da21a51b93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Applied physics</topic><topic>Capacitance</topic><topic>Current carriers</topic><topic>Diagnostic software</topic><topic>Diagnostic systems</topic><topic>Ligands</topic><topic>Light emitting diodes</topic><topic>Organic chemistry</topic><topic>Organic light emitting diodes</topic><topic>Quantum dots</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Blauth, Christian</creatorcontrib><creatorcontrib>Mulvaney, Paul</creatorcontrib><creatorcontrib>Hirai, Tadahiko</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Blauth, Christian</au><au>Mulvaney, Paul</au><au>Hirai, Tadahiko</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs</atitle><jtitle>Journal of applied physics</jtitle><date>2019-05-21</date><risdate>2019</risdate><volume>125</volume><issue>19</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>Impedance spectroscopy is a powerful and nondestructive tool for studying charge carrier dynamics in quantum dot light-emitting diodes (QLEDs). We report here that QLEDs exhibit unique capacitance behavior that strongly depends on the ligand chemistry of the quantum dots (QDs). At low frequencies and under bipolar injection, the capacitance of the QLEDs becomes negative before it returns to positive values at even lower frequencies. This behavior is fundamentally different from that observed in organic light-emitting diodes and is attributed to the accumulation of charge carriers within the ligand shells during operation. The capacitive response depends on both the conductivity and the length of the QD ligands and can be used as a diagnostic tool for understanding the luminescent recombination efficiency of a QLED. We find that short and conductive ligands result in positive device capacitances only and this correlates with enhanced device efficiency.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5088177</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-2674-3262</orcidid><orcidid>https://orcid.org/0000-0002-8007-3247</orcidid><orcidid>https://orcid.org/0000-0001-7189-1195</orcidid></addata></record> |
fulltext | fulltext |
identifier | ISSN: 0021-8979 |
ispartof | Journal of applied physics, 2019-05, Vol.125 (19) |
issn | 0021-8979 1089-7550 |
language | eng |
recordid | cdi_scitation_primary_10_1063_1_5088177 |
source | American Institute of Physics (AIP) Journals; Alma/SFX Local Collection |
subjects | Applied physics Capacitance Current carriers Diagnostic software Diagnostic systems Ligands Light emitting diodes Organic chemistry Organic light emitting diodes Quantum dots |
title | Negative capacitance as a diagnostic tool for recombination in purple quantum dot LEDs |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-01T11%3A03%3A35IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_scita&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Negative%20capacitance%20as%20a%20diagnostic%20tool%20for%20recombination%20in%20purple%20quantum%20dot%20LEDs&rft.jtitle=Journal%20of%20applied%20physics&rft.au=Blauth,%20Christian&rft.date=2019-05-21&rft.volume=125&rft.issue=19&rft.issn=0021-8979&rft.eissn=1089-7550&rft.coden=JAPIAU&rft_id=info:doi/10.1063/1.5088177&rft_dat=%3Cproquest_scita%3E2228349334%3C/proquest_scita%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2228349334&rft_id=info:pmid/&rfr_iscdi=true |