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That it is possible to surpass the 25 % limit set by spin statistics and achieve very efficient molecular light-emitting diodes (LEDs) is demonstrated by the experimental results presented here. It is shown that energy can be captured from both singlet and triplet excited states and transformed into emitted light. Studies of LEDs in which platinum octaethylporphyrin (PtOEP), an efficient triplet emitter, is used as a “dopant” in a semiconductor polymer host are described. Time-resolved measurements of light emission are used to determine the mechanism of excitation of PtOEP.
Cleave et al. (Mon,) studied this question.