Journal
SCIENCE
Volume 356, Issue 6334, Pages 159-163Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aah4345
Keywords
-
Categories
Funding
- Department of Physics (Cambridge)
- King Abdulaziz City for Science and Technology-Cambridge University Joint Centre of Excellence
- Singapore Agency for Science, Technology and Research (A*STAR)
- Winton Program for the Physics of Sustainability
- Cambridge NanoDTC [EP/L015978/1]
- Academy of Finland [251448]
- Engineering and Physical Sciences Research Council [EP/M005143/1]
- European Research Council (ERC)
- ERC [338944-GOCAT]
- Royal Society [UF130278, RG140472]
- Engineering and Physical Sciences Research Council [1361716, EP/M005143/1] Funding Source: researchfish
- Royal Society [UF130278] Funding Source: Royal Society
- EPSRC [EP/M005143/1] Funding Source: UKRI
Ask authors/readers for more resources
Organic light-emitting diodes (OLEDs) promise highly efficient lighting and display technologies. We introduce a new class of linear donor-bridge-acceptor light-emitting molecules, which enable solution-processed OLEDs with near-100% internal quantum efficiency at high brightness. Key to this performance is their rapid and efficient utilization of triplet states. Using time-resolved spectroscopy, we establish that luminescence via triplets occurs within 350 nanoseconds at ambient temperature, after reverse intersystem crossing to singlets. We find that molecular geometries exist at which the singlet-triplet energy gap (exchange energy) is close to zero, so that rapid interconversion is possible. Calculations indicate that exchange energy is tuned by relative rotation of the donor and acceptor moieties about the bridge. Unlike other systems with low exchange energy, substantial oscillator strength is sustained at the singlet-triplet degeneracy point.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available