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| - Charge-Induced Luminescence Quenching in OrganicLight-Emitting Diodes
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| - An Alq3 monolayer doped with DCJTB fluorescent sites (white circles) is the active layer in an organic light-emitting diode. Förster energy transfer from DCJTB S1 (asterisks) to DCJTB cations (plus) quenches the luminescence when cation densities make it likely that there is a DCJTB cation within the Förster radius R0.
- We use charge modulation spectroscopy (CMS) in model holes-only devices to address thereason for decreasing quantum efficiency with increasing drive current in organic light-emitting diodes based on Alq3 doped with the red dye DCJTB. We are able to measure thedensity of DCJTB+ and correlate it with the diminution of the photoluminescence. Themagnitude and DCJTB+ density dependence of the photoluminescence reduction are roughlyconsistent with quenching of the singlet-excited-state of DCJTB via Förster energy transferto DCJTB+. At low DCJTB+ densities, the quenching is stronger than theory would predictand we propose that singlet energy transport among DCJTB molecules extends the distanceover which quenching by DCJTB+ is effective. Since the Förster mechanism can beresponsible for charge-induced PL quenching as large as 70% even though DCJTB+ is veryweakly absorbing where DCJTB singlets fluoresce, it may be difficult to avoid quenching byelectrically generated species.
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