An afterglow organic light-emitting diode (OLED) that displays electroluminescence with long transient decay after it is turned off is demonstrated. This OLED exhibits blue and green dual emission originating from fluorescence and phosphorescence, respectively. A phosphorescence lifetime of 4.3 s is achieved.

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Kabe et al. (Tue,) studied this question.

synapsesocial.com/papers/69d973585e5bcb4e3b8367ef https://doi.org/https://doi.org/10.1002/adma.201504321

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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

1Electroluminescence from triplet excited states of benzophenone1996 · 90 citations
2Phosphorescence spectra from selected sites of N-ethylcarbazole in n-alkanes1974 · 12 citations
3Tunable recognition of the steroid α-face by adjacent π-electron density2010 · 65 citations
4Radiationless deactivation of triplet coronene in plastics1967 · 96 citations
5Bright red light-emitting organic electroluminescent devices having a europium complex as an emitter1994 · 508 citations