||Conjugated polymers nanoparticles (CPdots) have been investigated by a number of scientist who are interested in optoelectronic devices and biomedical applications. However, studies on CPdot with various fluorescent colors have not widely been conducted. Moreover, several white light-emitting CPdots have been investigated through combining RGB colors or mixing blue and yellow fluorescent CPs. However, little is known about changing the size of CPdot which emits white-light using a single CP. We conjectured CPdot for white light using a single CP with special light emission characteristics. The CP can emit orange and blue fluorescence colors in solid state and solution state, respectively. Finally, using a single CP, we found that CPdots of a intended size could manipulate the energy transfer of CPdors and emit white-light that consists of blue and orange.