Room Temperature Phosphorescence of Metal-Free Organic Materials in Amorphous Polymer Matrices
Room Temperature Phosphorescence of Metal-Free Organic Materials in Amorphous Polymer Matrices
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DOI：
10.1021/ja401769g
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发表时间：
2013-04-24
影响因子：
15
通讯作者：
Kim, Jinsang
中科院分区：
文献类型：
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作者：
Lee, Dongwook;Bolton, Onas;Kim, Jinsang
开发无金属的有机磷光材料是有希望的，但具有挑战性，因为在没有重金属原子的情况下，难以实现优于三重态振动损失的发射三重态弛豫，这是实现磷光的关键过程。虽然最近的研究表明，通过定向卤素键合可以在纯有机晶体材料中实现明亮的室温磷光，但由于对高质量晶体形成的严格要求，这些有机荧光粉在实际应用中仍然存在局限性。在这里，我们报告明亮的室温磷光嵌入到一个无定形的玻璃状聚合物基质的纯有机磷光体。我们的研究表明，全同立构PMMA的降低的β（β）-弛豫最有效地抑制了振动三重态衰减，并允许嵌入的有机磷光体实现明亮的7.5%的磷光量子产率。我们还展示了一个微流控器件集成了一种新型的温度传感器的基础上的无金属的纯有机磷光体的温度敏感的聚合物基质。这种独特的系统具有许多优点：（i）简单的器件结构，无需添加额外的温度传感剂，（ii）明亮的磷光发射，（iii）可逆的热响应，以及（iv）通过使用不同的聚合物可调的温度传感范围。
Developing metal-free organic phosphorescent materials is promising but challenging because achieving emissive triplet relaxation that outcompetes the vibrational loss of triplets, a key process to achieving phosphorescence, is difficult without heavy metal atoms. While recent studies reveal that bright room temperature phosphorescence can be realized in purely organic crystalline materials through directed halogen bonding, these organic phosphors still have limitations to practical applications due to the stringent requirement of high quality crystal formation. Here we report bright room temperature phosphorescence by embedding a purely organic phosphor into an amorphous glassy polymer matrix. Our study implies that the reduced beta (beta)-relaxation of isotactic PMMA most efficiently suppresses vibrational triplet decay and allows the embedded organic phosphors to achieve a bright 7.5% phosphorescence quantum yield. We also demonstrate a microfluidic device integrated with a novel temperature sensor based on the metal-free purely organic phosphors in the temperature-sensitive polymer matrix. This unique system has many advantages: (i) simple device structures without feeding additional temperature sensing agents, (ii) bright phosphorescence emission, (iii) a reversible thermal response, and (iv) tunable temperature sensing ranges by using different polymers.