Organic light-emitting transistors (OLETs) combining the light-emitting function of organic light-emitting diodes (OLEDs) and the current modulation (and signal amplification) function of organic field-effect transistors (OFETs) in a single device are promising components for optoelectronics, smart display technologies, and electrically pumped lasers. To improve these technologies, it is crucial to develop high-mobility emissive organic semiconductors with tunable colors, the core active layer for OLETs. However, this remains a challenge.