Photoemission and X-ray absorption spectroscopies of phosphorescent organic iridium complexes
Phosphorescent materials represent an attractive route to high-efficiency organic LEDs, since their maximum theoretical quantum efficiency is 100%, compared to the 25% of fluorescent materials. We have studied the electronic structure of three phosphorescent iridium complexes, the red-emitter Iridiu...
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| Veröffentlicht in: | Synthetic metals 2005-09, Vol.153 (1), p.233-236 |
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| creator | Thompson, J. Arima, V. Matino, F. Berkebile, S. Koller, G. Netzer, F.P. Ramsey, M.G. Cingolani, R. Blyth, R.I.R. |
| description | Phosphorescent materials represent an attractive route to high-efficiency organic LEDs, since their maximum theoretical quantum efficiency is 100%, compared to the 25% of fluorescent materials. We have studied the electronic structure of three phosphorescent iridium complexes, the red-emitter Iridium bis (2-(2′-benzothienyl) pyridinato-N, C
3′) (acetylacetonate), the blue emitter, Iridium bis(2-(4,6- difluorophenyl) pyridinato-N,C
2′) picolinate, and the green emitter Iridium tris (2-(4-totyl)pyridinato N,C
2) using electron spectroscopies. The materials were evaporated in-situ onto a clean gold substrate in ulta-high vacuum. The valence band electronic structures were investigated using resonant photoemission, with the unoccupied states determined using X-ray absorption. The data suggests a hybridisation of the Ir 5d states with the π orbitals of the ligand. NEXAFS spectra are shown to be highly sensitive to the local environment. |
| doi_str_mv | 10.1016/j.synthmet.2005.07.274 |
| format | Article |
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3′) (acetylacetonate), the blue emitter, Iridium bis(2-(4,6- difluorophenyl) pyridinato-N,C
2′) picolinate, and the green emitter Iridium tris (2-(4-totyl)pyridinato N,C
2) using electron spectroscopies. The materials were evaporated in-situ onto a clean gold substrate in ulta-high vacuum. The valence band electronic structures were investigated using resonant photoemission, with the unoccupied states determined using X-ray absorption. The data suggests a hybridisation of the Ir 5d states with the π orbitals of the ligand. NEXAFS spectra are shown to be highly sensitive to the local environment.</description><identifier>ISSN: 0379-6779</identifier><identifier>EISSN: 1879-3290</identifier><identifier>DOI: 10.1016/j.synthmet.2005.07.274</identifier><identifier>CODEN: SYMEDZ</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Electron and ion emission by liquids and solids; impact phenomena ; Electron density of states and band structure of crystalline solids ; Electron states ; Exact sciences and technology ; Organic semiconductors based on conjugated molecules ; Photoelectron spectroscopy ; Photoemission and photoelectron spectra ; Physics ; X-ray absorption spectroscopy</subject><ispartof>Synthetic metals, 2005-09, Vol.153 (1), p.233-236</ispartof><rights>2005 Elsevier B.V.</rights><rights>2006 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c373t-9e48264de5e3b2d226176898911ddfed23230c85233459a749ce4e4e7d8b4de63</citedby><cites>FETCH-LOGICAL-c373t-9e48264de5e3b2d226176898911ddfed23230c85233459a749ce4e4e7d8b4de63</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.synthmet.2005.07.274$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>310,311,315,781,785,790,791,3551,23935,23936,25145,27929,27930,46000</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=17170042$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Thompson, J.</creatorcontrib><creatorcontrib>Arima, V.</creatorcontrib><creatorcontrib>Matino, F.</creatorcontrib><creatorcontrib>Berkebile, S.</creatorcontrib><creatorcontrib>Koller, G.</creatorcontrib><creatorcontrib>Netzer, F.P.</creatorcontrib><creatorcontrib>Ramsey, M.G.</creatorcontrib><creatorcontrib>Cingolani, R.</creatorcontrib><creatorcontrib>Blyth, R.I.R.</creatorcontrib><title>Photoemission and X-ray absorption spectroscopies of phosphorescent organic iridium complexes</title><title>Synthetic metals</title><description>Phosphorescent materials represent an attractive route to high-efficiency organic LEDs, since their maximum theoretical quantum efficiency is 100%, compared to the 25% of fluorescent materials. We have studied the electronic structure of three phosphorescent iridium complexes, the red-emitter Iridium bis (2-(2′-benzothienyl) pyridinato-N, C
3′) (acetylacetonate), the blue emitter, Iridium bis(2-(4,6- difluorophenyl) pyridinato-N,C
2′) picolinate, and the green emitter Iridium tris (2-(4-totyl)pyridinato N,C
2) using electron spectroscopies. The materials were evaporated in-situ onto a clean gold substrate in ulta-high vacuum. The valence band electronic structures were investigated using resonant photoemission, with the unoccupied states determined using X-ray absorption. The data suggests a hybridisation of the Ir 5d states with the π orbitals of the ligand. 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We have studied the electronic structure of three phosphorescent iridium complexes, the red-emitter Iridium bis (2-(2′-benzothienyl) pyridinato-N, C
3′) (acetylacetonate), the blue emitter, Iridium bis(2-(4,6- difluorophenyl) pyridinato-N,C
2′) picolinate, and the green emitter Iridium tris (2-(4-totyl)pyridinato N,C
2) using electron spectroscopies. The materials were evaporated in-situ onto a clean gold substrate in ulta-high vacuum. The valence band electronic structures were investigated using resonant photoemission, with the unoccupied states determined using X-ray absorption. The data suggests a hybridisation of the Ir 5d states with the π orbitals of the ligand. NEXAFS spectra are shown to be highly sensitive to the local environment.</abstract><cop>Lausanne</cop><cop>Amsterdam</cop><cop>New York, NY</cop><pub>Elsevier B.V</pub><doi>10.1016/j.synthmet.2005.07.274</doi><tpages>4</tpages></addata></record> |
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| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron and ion emission by liquids and solids impact phenomena Electron density of states and band structure of crystalline solids Electron states Exact sciences and technology Organic semiconductors based on conjugated molecules Photoelectron spectroscopy Photoemission and photoelectron spectra Physics X-ray absorption spectroscopy |
| title | Photoemission and X-ray absorption spectroscopies of phosphorescent organic iridium complexes |
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