E-Type Delayed Fluorescence of a Phosphine-Supported Cu_2(μ-NAr_2)_2 Diamond Core: Harvesting Singlet and Triplet Excitons in OLEDs
Abstract
A highly emissive bis(phosphine)diarylamido dinuclear copper(I) complex (quantum yield = 57%) was shown to exhibit E-type delayed fluorescence by variable temperature emission spectroscopy and photoluminescence decay measurement of doped vapor-deposited films. The lowest energy singlet and triplet excited states were assigned as charge transfer states on the basis of theoretical calculations and the small observed S_1−T_1 energy gap. Vapor-deposited OLEDs doped with the complex in the emissive layer gave a maximum external quantum efficiency of 16.1%, demonstrating that triplet excitons can be harvested very efficiently through the delayed fluorescence channel. The function of the emissive dopant in OLEDs was further probed by several physical methods, including electrically detected EPR, cyclic voltammetry, and photoluminescence in the presence of applied current.
Additional Information
© 2010 American Chemical Society. Received January 18, 2010. Publication Date (Web): June 17, 2010. The authors thank the National Science Foundation for support through Grant CHE 0616782 under the GOALI Program (Grant Opportunity for Academic Liaison with Industry). We thank the following people for technical assistance and insightful discussions: Ching W. Tang, Kevin Klubek, Shouquan Huo, Viktor Jarikov, Christopher Brown, Michael Landry, Debra Blondell, Shawn Reuter, and Dustin Comfort. We are grateful to Prof. Richard Eisenberg, University of Rochester, who was instrumental in bringing about our collaboration.Attached Files
Supplemental Material - ja1004575_si_001.pdf
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Additional details
- Eprint ID
- 19301
- DOI
- 10.1021/ja1004575
- Resolver ID
- CaltechAUTHORS:20100805-140123621
- CHE 0616782
- NSF
- Created
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2010-08-05Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field