Phosphorescent light-emitting transistors, in which light emission from singlet and triplet energy levels is harvested using solution-processed materials (see figure), are presented. While a green phosphorescent dendrimer exhibits an external quantum efficiency of 0.45% at 480 cd m−2, a red polymer/phosphorescent small-molecule blend produces a brightness exceeding 30 cd m−2 with a relatively high hole mobility of 2.5 × 10−2 cm2 V−1 s−1.
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