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Title: | Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs |
Authors: | Shafikov, M. Z. Daniels, R. Pander, P. Dias, F. B. Williams, J. A. G. Kozhevnikov, V. N. |
Issue Date: | 2019 |
Publisher: | American Chemical Society |
Citation: | Dinuclear Design of a Pt(II) Complex Affording Highly Efficient Red Emission: Photophysical Properties and Application in Solution-Processible OLEDs / M. Z. Shafikov, R. Daniels, P. Pander, et al. — DOI 10.1021/acsami.8b18928 // ACS Applied Materials and Interfaces. — 2019. — Vol. 11. — Iss. 8. — P. 8182-8193. |
Abstract: | The light-emitting efficiency of luminescent materials is invariably compromised on moving to the red and near-infrared regions of the spectrum due to the transfer of electronic excited-state energy into vibrations. We describe how this undesirable "energy gap law" can be sidestepped for phosphorescent organometallic emitters through the design of a molecular emitter that incorporates two platinum(II) centers. The dinuclear cyclometallated complex of a substituted 4,6-bis(2-thienyl)pyrimidine emits very brightly in the red region of the spectrum (λ max = 610 nm, Î= 0.85 in deoxygenated CH 2 Cl 2 at 300 K). The lowest-energy absorption band is extraordinarily intense for a cyclometallated metal complex: At λ = 500 nm, Îμ = 53 800 M -1 cm -1 . The very high efficiency of emission achieved can be traced to an unusually high rate constant for the T 1 â†' S 0 phosphorescence process, allowing it to compete effectively with nonradiative vibrational decay. The high radiative rate constant correlates with an unusually large zero-field splitting of the triplet state, which is estimated to be 40 cm -1 by means of variableerature time-resolved spectroscopy over the range 1.7 < T < 120 K. The compound has been successfully tested as a red phosphor in an organic light-emitting diode prepared by solution processing. The results highlight a potentially attractive way to develop highly efficient red and NIR-emitting devices through the use of multinuclear complexes. © 2019 American Chemical Society. |
Keywords: | DEEP-RED LUMINESCENCE DINUCLEAR PLATINUM COMPLEX ELECTROLUMINESCENCE NEAR-INFRARED EMISSION TRIPLET HARVESTING CHLORINE COMPOUNDS ELECTROLUMINESCENCE ENERGY GAP EXCITED STATES INFRARED DEVICES LASER SPECTROSCOPY LIGHT METAL COMPLEXES ORGANIC LIGHT EMITTING DIODES (OLED) ORGANOMETALLICS PHOSPHORESCENCE RATE CONSTANTS CYCLOMETALLATED COMPLEXES DINUCLEAR PLATINUM COMPLEXES LIGHT-EMITTING EFFICIENCY NEAR-INFRARED EMISSIONS PHOTOPHYSICAL PROPERTIES RADIATIVE RATE CONSTANTS RED LUMINESCENCE TIME-RESOLVED SPECTROSCOPY PLATINUM COMPOUNDS |
URI: | http://elar.urfu.ru/handle/10995/101813 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85061934037 |
WOS ID: | 000460365300057 |
PURE ID: | a9e50a73-70c4-4ccc-9981-e164c2841e4f 9074848 |
ISSN: | 19448244 |
DOI: | 10.1021/acsami.8b18928 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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