Two conjugated polymers (CPs) with various compositions of phenylene and benzoselenadiazoben (BSD) are synthesized to have a special emitting property; different fluorescence colors in solution and in the solid states, allowing the resulting conjugated polymer dots (Pdots) to emit different fluorescence colors upon their size variation. The photophysical property of such different‐sized Pdots is investigated using fluorescence spectra and fluorescence lifetimes. A decrease in the fluorescence lifetime of Pdots is observed with an increase in the size of Pdots, caused by quantitative change in energy transfer from phenylene (energy donor) to the BSD unit (energy acceptor). The results provide that any CP can be used for the fabrication of Pdots with size‐tunable emission, as long as the CP shows different emissions according to its phases. Such emission of Pdots can even be observed when in the solid solution in polymer matrix, which emits different fluorescence colors depending on the size of embedded Pdots in the polymer matrix.

中文翻译：

---

通过单个共轭聚合物的尺寸可控的聚合物点进行发射调谐

合成了具有不同组成的亚苯基和苯并硒二氮杂苯（BSD）的两种共轭聚合物（CPs），它们具有特殊的发射性能。溶液和固态中的荧光颜色不同，从而使所得的共轭聚合物点（Pdot）随尺寸变化而发出不同的荧光颜色。使用荧光光谱和荧光寿命研究了这些不同大小的Pdots的光物理性质。Pdots的荧光寿命会随着Pdots尺寸的增加而减少，这是由于从苯（能量供体）到BSD单元（能量受体）的能量转移发生了定量变化。结果表明，只要CP根据其阶段显示不同的发射，任何CP均可用于制造尺寸可调的发射点。