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Effect of Host Generation on the Luminescent and Charge Transporting Properties of Solution Processed OLEDs
Tris(4‐carbazoyl‐9‐ylphenyl)amine (TCTA) is a commonly used host material for organic light‐emitting diodes (OLEDs). TCTA has poor solubility and hence to improve solubility the authors have synthesized first‐ and second‐generation TCTA‐based dendrimers with n‐propyl surface groups. These dendrimeri...
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| Published in: | Advanced materials interfaces 2021-10, Vol.8 (20), p.n/a |
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| container_title | Advanced materials interfaces |
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| creator | Gao, Mile Jang, Junhyuk Leitner, Tanja Mai, Van T. N. Ranasinghe, Chandana S. K. Chu, Ronan Burn, Paul L. Pivrikas, Almantas Shaw, Paul E. |
| description | Tris(4‐carbazoyl‐9‐ylphenyl)amine (TCTA) is a commonly used host material for organic light‐emitting diodes (OLEDs). TCTA has poor solubility and hence to improve solubility the authors have synthesized first‐ and second‐generation TCTA‐based dendrimers with n‐propyl surface groups. These dendrimeric TCTA hosts have improved solubility and similar photophysical properties to TCTA. The hole mobility of solution‐processed TCTA is found to be an order of magnitude less than films formed by evaporation and similar to that of the two dendronized TCTAs (mobilities in the order of 10−5 cm2 V−1 s−1). The hole mobility in the films is found to decrease when a green emissive first‐generation light‐emitting dendrimer is blended with the host materials due to charge trapping on the emissive guest. In the case of the second‐generation host, there is evidence of a degree of phase separation in the film. Organic light‐emitting diodes are fabricated at guest concentrations corresponding to the maximum observed photoluminescence quantum yield (PLQY) and lowest hole mobility. It is found that the external quantum efficiency (EQE) does not always scale with the PLQY, leading to devices that have EQEs higher than expected based on the PLQY and outcoupling of light from a bottom emitting device.
Energy transfer, photoluminescence quantum yield (PLQY), charge mobility, and organic light‐emitting diode (OLED) performance are found to be dependent on the generation of the dendrimer host. OLED performance of the TCTA‐based host materials blended with a soluble phosphorescent light‐emitting dendrimer is found to depend on the maximum film PLQY, with good external quantum efficiencies achieved despite low charge mobilities. |
| doi_str_mv | 10.1002/admi.202100820 |
| format | article |
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Energy transfer, photoluminescence quantum yield (PLQY), charge mobility, and organic light‐emitting diode (OLED) performance are found to be dependent on the generation of the dendrimer host. OLED performance of the TCTA‐based host materials blended with a soluble phosphorescent light‐emitting dendrimer is found to depend on the maximum film PLQY, with good external quantum efficiencies achieved despite low charge mobilities.</description><identifier>ISSN: 2196-7350</identifier><identifier>EISSN: 2196-7350</identifier><identifier>DOI: 10.1002/admi.202100820</identifier><language>eng</language><publisher>Weinheim: John Wiley & Sons, Inc</publisher><subject>Charge materials ; charge transport ; dendrimeric hosts ; Dendrimers ; Hole mobility ; light‐emitting dendrimer ; molecular volume ; Organic light emitting diodes ; Phase separation ; Photoluminescence ; Quantum efficiency ; Solubility</subject><ispartof>Advanced materials interfaces, 2021-10, Vol.8 (20), p.n/a</ispartof><rights>2021 Wiley‐VCH GmbH</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3570-c8f8f27345ade2728c507ae237fda56009eebda69fc818c7db4c0f89d4014f4f3</citedby><cites>FETCH-LOGICAL-c3570-c8f8f27345ade2728c507ae237fda56009eebda69fc818c7db4c0f89d4014f4f3</cites><orcidid>0000-0003-3405-3517</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%2Fadmi.202100820$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fadmi.202100820$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>315,786,790,27957,27958,50923,51032</link.rule.ids></links><search><creatorcontrib>Gao, Mile</creatorcontrib><creatorcontrib>Jang, Junhyuk</creatorcontrib><creatorcontrib>Leitner, Tanja</creatorcontrib><creatorcontrib>Mai, Van T. N.</creatorcontrib><creatorcontrib>Ranasinghe, Chandana S. K.</creatorcontrib><creatorcontrib>Chu, Ronan</creatorcontrib><creatorcontrib>Burn, Paul L.</creatorcontrib><creatorcontrib>Pivrikas, Almantas</creatorcontrib><creatorcontrib>Shaw, Paul E.</creatorcontrib><title>Effect of Host Generation on the Luminescent and Charge Transporting Properties of Solution Processed OLEDs</title><title>Advanced materials interfaces</title><description>Tris(4‐carbazoyl‐9‐ylphenyl)amine (TCTA) is a commonly used host material for organic light‐emitting diodes (OLEDs). TCTA has poor solubility and hence to improve solubility the authors have synthesized first‐ and second‐generation TCTA‐based dendrimers with n‐propyl surface groups. These dendrimeric TCTA hosts have improved solubility and similar photophysical properties to TCTA. The hole mobility of solution‐processed TCTA is found to be an order of magnitude less than films formed by evaporation and similar to that of the two dendronized TCTAs (mobilities in the order of 10−5 cm2 V−1 s−1). The hole mobility in the films is found to decrease when a green emissive first‐generation light‐emitting dendrimer is blended with the host materials due to charge trapping on the emissive guest. In the case of the second‐generation host, there is evidence of a degree of phase separation in the film. Organic light‐emitting diodes are fabricated at guest concentrations corresponding to the maximum observed photoluminescence quantum yield (PLQY) and lowest hole mobility. It is found that the external quantum efficiency (EQE) does not always scale with the PLQY, leading to devices that have EQEs higher than expected based on the PLQY and outcoupling of light from a bottom emitting device.
Energy transfer, photoluminescence quantum yield (PLQY), charge mobility, and organic light‐emitting diode (OLED) performance are found to be dependent on the generation of the dendrimer host. OLED performance of the TCTA‐based host materials blended with a soluble phosphorescent light‐emitting dendrimer is found to depend on the maximum film PLQY, with good external quantum efficiencies achieved despite low charge mobilities.</description><subject>Charge materials</subject><subject>charge transport</subject><subject>dendrimeric hosts</subject><subject>Dendrimers</subject><subject>Hole mobility</subject><subject>light‐emitting dendrimer</subject><subject>molecular volume</subject><subject>Organic light emitting diodes</subject><subject>Phase separation</subject><subject>Photoluminescence</subject><subject>Quantum efficiency</subject><subject>Solubility</subject><issn>2196-7350</issn><issn>2196-7350</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFUE1LAzEQXUTBUnv1HPC8dZL9yh5LW9vCioL1HNJk0m5tkzXZIv33bq2oN2Fg3gzvA14U3VIYUgB2L_W-HjJg3cEZXEQ9Rss8LpIMLv_g62gQwhYAKGWU8aQXvU2NQdUSZ8jchZbM0KKXbe0s6abdIKkO-9piUGhbIq0m4430ayRLL21onG9ruybP3jXYQQwnoxe3O3w5dG-FIaAmT9V0Em6iKyN3AQffux-9PkyX43lcPc0W41EVqyQrIFbccMOKJM2kRlYwrjIoJLKkMFpmOUCJuNIyL43ilKtCr1IFhpc6BZqa1CT96O7s23j3fsDQiq07eNtFCpbxlLEE8rxjDc8s5V0IHo1ofL2X_igoiFOn4tSp-Om0E5RnwUe9w-M_bDGaPC5-tZ_WentI</recordid><startdate>20211001</startdate><enddate>20211001</enddate><creator>Gao, Mile</creator><creator>Jang, Junhyuk</creator><creator>Leitner, Tanja</creator><creator>Mai, Van T. N.</creator><creator>Ranasinghe, Chandana S. K.</creator><creator>Chu, Ronan</creator><creator>Burn, Paul L.</creator><creator>Pivrikas, Almantas</creator><creator>Shaw, Paul E.</creator><general>John Wiley & Sons, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-3405-3517</orcidid></search><sort><creationdate>20211001</creationdate><title>Effect of Host Generation on the Luminescent and Charge Transporting Properties of Solution Processed OLEDs</title><author>Gao, Mile ; Jang, Junhyuk ; Leitner, Tanja ; Mai, Van T. N. ; Ranasinghe, Chandana S. 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N.</creatorcontrib><creatorcontrib>Ranasinghe, Chandana S. K.</creatorcontrib><creatorcontrib>Chu, Ronan</creatorcontrib><creatorcontrib>Burn, Paul L.</creatorcontrib><creatorcontrib>Pivrikas, Almantas</creatorcontrib><creatorcontrib>Shaw, Paul E.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Advanced materials interfaces</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gao, Mile</au><au>Jang, Junhyuk</au><au>Leitner, Tanja</au><au>Mai, Van T. N.</au><au>Ranasinghe, Chandana S. K.</au><au>Chu, Ronan</au><au>Burn, Paul L.</au><au>Pivrikas, Almantas</au><au>Shaw, Paul E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Host Generation on the Luminescent and Charge Transporting Properties of Solution Processed OLEDs</atitle><jtitle>Advanced materials interfaces</jtitle><date>2021-10-01</date><risdate>2021</risdate><volume>8</volume><issue>20</issue><epage>n/a</epage><issn>2196-7350</issn><eissn>2196-7350</eissn><abstract>Tris(4‐carbazoyl‐9‐ylphenyl)amine (TCTA) is a commonly used host material for organic light‐emitting diodes (OLEDs). TCTA has poor solubility and hence to improve solubility the authors have synthesized first‐ and second‐generation TCTA‐based dendrimers with n‐propyl surface groups. These dendrimeric TCTA hosts have improved solubility and similar photophysical properties to TCTA. The hole mobility of solution‐processed TCTA is found to be an order of magnitude less than films formed by evaporation and similar to that of the two dendronized TCTAs (mobilities in the order of 10−5 cm2 V−1 s−1). The hole mobility in the films is found to decrease when a green emissive first‐generation light‐emitting dendrimer is blended with the host materials due to charge trapping on the emissive guest. In the case of the second‐generation host, there is evidence of a degree of phase separation in the film. Organic light‐emitting diodes are fabricated at guest concentrations corresponding to the maximum observed photoluminescence quantum yield (PLQY) and lowest hole mobility. It is found that the external quantum efficiency (EQE) does not always scale with the PLQY, leading to devices that have EQEs higher than expected based on the PLQY and outcoupling of light from a bottom emitting device.
Energy transfer, photoluminescence quantum yield (PLQY), charge mobility, and organic light‐emitting diode (OLED) performance are found to be dependent on the generation of the dendrimer host. OLED performance of the TCTA‐based host materials blended with a soluble phosphorescent light‐emitting dendrimer is found to depend on the maximum film PLQY, with good external quantum efficiencies achieved despite low charge mobilities.</abstract><cop>Weinheim</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/admi.202100820</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0003-3405-3517</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Charge materials charge transport dendrimeric hosts Dendrimers Hole mobility light‐emitting dendrimer molecular volume Organic light emitting diodes Phase separation Photoluminescence Quantum efficiency Solubility |
| title | Effect of Host Generation on the Luminescent and Charge Transporting Properties of Solution Processed OLEDs |
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