Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4887346
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Funding
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER)
- MEXT
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Intense n pi* fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the np* transition and the higher energy of the (3)pi pi* state than the 3 n pi* one lead to a small energy difference between the lowest singlet (S-1) and triplet (T-1) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0%, indicating that HAP-3MF harvests singlet excitons through a thermally activated T-1 -> S-1 pathway in the electroluminescent process. (C) 2014 AIP Publishing LLC.
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