Photophysics of Pt-porphyrin electrophosphorescent devices emitting in the near infrared
The triplet annihilation dynamics of near infrared organic light-emitting devices are studied with peak electrophosphorescence at a wavelength of 772 nm using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films...
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| Veröffentlicht in: | Applied physics letters 2007-05, Vol.90 (21), p.213503-213503-3 |
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| container_issue | 21 |
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| container_title | Applied physics letters |
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| creator | Sun, Yiru Borek, Carsten Hanson, Kenneth Djurovich, Peter I. Thompson, Mark E. Brooks, Jason Brown, Julie J. Forrest, Stephen R. |
| description | The triplet annihilation dynamics of near infrared organic light-emitting devices are studied with peak electrophosphorescence at a wavelength of
772
nm
using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films and the quantum efficiency versus current density characteristics of devices using tris(8-hydroxyquinoline) aluminum or
4
,
4
′
-bis(
N
-carbazolyl)biphenyl (CBP) as hosts are fitted by a model based on triplet-triplet annihilation. When the phosphor is codoped with Ir(III) bis(2-phenyl quinolyl-
N
,
C
2
′
) acetylacetonate in CBP, the quantum efficiency is enhanced, and the observed decrease of efficiency at high current densities is explained by field-induced charge pair dissociation. The external quantum efficiency has a maximum of
(
8.5
±
0.3
)
%
, decreasing to
(
5.0
±
0.3
)
%
at
1
mA
∕
cm
2
. |
| doi_str_mv | 10.1063/1.2740113 |
| format | Article |
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772
nm
using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films and the quantum efficiency versus current density characteristics of devices using tris(8-hydroxyquinoline) aluminum or
4
,
4
′
-bis(
N
-carbazolyl)biphenyl (CBP) as hosts are fitted by a model based on triplet-triplet annihilation. When the phosphor is codoped with Ir(III) bis(2-phenyl quinolyl-
N
,
C
2
′
) acetylacetonate in CBP, the quantum efficiency is enhanced, and the observed decrease of efficiency at high current densities is explained by field-induced charge pair dissociation. The external quantum efficiency has a maximum of
(
8.5
±
0.3
)
%
, decreasing to
(
5.0
±
0.3
)
%
at
1
mA
∕
cm
2
.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.2740113</identifier><identifier>CODEN: APPLAB</identifier><language>eng</language><publisher>American Institute of Physics</publisher><ispartof>Applied physics letters, 2007-05, Vol.90 (21), p.213503-213503-3</ispartof><rights>2007 American Institute of Physics</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c350t-c4fee05052d405db69c921365be969abe82d4fa4b8d816d4724a5cef76f3533</citedby><cites>FETCH-LOGICAL-c350t-c4fee05052d405db69c921365be969abe82d4fa4b8d816d4724a5cef76f3533</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/apl/article-lookup/doi/10.1063/1.2740113$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>314,776,780,790,1553,4498,27901,27902,76126,76132</link.rule.ids></links><search><creatorcontrib>Sun, Yiru</creatorcontrib><creatorcontrib>Borek, Carsten</creatorcontrib><creatorcontrib>Hanson, Kenneth</creatorcontrib><creatorcontrib>Djurovich, Peter I.</creatorcontrib><creatorcontrib>Thompson, Mark E.</creatorcontrib><creatorcontrib>Brooks, Jason</creatorcontrib><creatorcontrib>Brown, Julie J.</creatorcontrib><creatorcontrib>Forrest, Stephen R.</creatorcontrib><title>Photophysics of Pt-porphyrin electrophosphorescent devices emitting in the near infrared</title><title>Applied physics letters</title><description>The triplet annihilation dynamics of near infrared organic light-emitting devices are studied with peak electrophosphorescence at a wavelength of
772
nm
using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films and the quantum efficiency versus current density characteristics of devices using tris(8-hydroxyquinoline) aluminum or
4
,
4
′
-bis(
N
-carbazolyl)biphenyl (CBP) as hosts are fitted by a model based on triplet-triplet annihilation. When the phosphor is codoped with Ir(III) bis(2-phenyl quinolyl-
N
,
C
2
′
) acetylacetonate in CBP, the quantum efficiency is enhanced, and the observed decrease of efficiency at high current densities is explained by field-induced charge pair dissociation. The external quantum efficiency has a maximum of
(
8.5
±
0.3
)
%
, decreasing to
(
5.0
±
0.3
)
%
at
1
mA
∕
cm
2
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772
nm
using a platinum-porphyrin derivative Pt(II)-tetraphenyltetrabenzoporphyrin as dopant. Both the photoluminescent decay transients of the thin films and the quantum efficiency versus current density characteristics of devices using tris(8-hydroxyquinoline) aluminum or
4
,
4
′
-bis(
N
-carbazolyl)biphenyl (CBP) as hosts are fitted by a model based on triplet-triplet annihilation. When the phosphor is codoped with Ir(III) bis(2-phenyl quinolyl-
N
,
C
2
′
) acetylacetonate in CBP, the quantum efficiency is enhanced, and the observed decrease of efficiency at high current densities is explained by field-induced charge pair dissociation. The external quantum efficiency has a maximum of
(
8.5
±
0.3
)
%
, decreasing to
(
5.0
±
0.3
)
%
at
1
mA
∕
cm
2
.</abstract><pub>American Institute of Physics</pub><doi>10.1063/1.2740113</doi></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0003-6951 |
| ispartof | Applied physics letters, 2007-05, Vol.90 (21), p.213503-213503-3 |
| issn | 0003-6951 1077-3118 |
| language | eng |
| recordid | cdi_crossref_primary_10_1063_1_2740113 |
| source | AIP Journals Complete; AIP Digital Archive |
| title | Photophysics of Pt-porphyrin electrophosphorescent devices emitting in the near infrared |
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