A saturated-red emitting system suitable for solution-processable LEDs (light-emitting diodes) is reported. In their approach the authors dope the blue-emitting conjugated polymer poly(9,9-dioctylfluorene) (see Figure) with the red dye tetraphenylporphyrin, which leads to an efficient single-step Forster transfer from blue to red. The fabrication and efficiency of LEDs based on this system are also described.