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In a recent Letter Lee et al. studied the spin 1/2 photoluminescence-detectedmagnetic resonance (PLDMR) of a soluble derivative of poly-phenylene vinylene[MEH-PPV] and argued that it originates from the interaction of tripletexcitons with polarons. We show that in MEH-PPV as well as in other conjugatedpolymers the spin 1/2 PLDMR does not depend on the triplet exciton density andthus cannot be associated with triplet excitons.Comment: To be published in Physical Review Letter

Comment on “Yield of Singlet Excitons in Organic Light-Emitting Devices: A Double Modulation Photoluminescence-Detected Magnetic Resonance Study”