Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101813
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://hdl.handle.net/10995/101813
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85061934037
PURE ID: 9074848
a9e50a73-70c4-4ccc-9981-e164c2841e4f
ISSN: 19448244
DOI: 10.1021/acsami.8b18928
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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