作者:Yang Xiao、Lei Liu、Chaobin He、Wee Shong Chin、Tingting Lin、Khine Y. Mya、Junchao Huang、Xuehong Lu
DOI:10.1039/b510666d
日期:——
A series of nano-hybrid light emitting dots with diameter range from 2 nm to 4 nm were synthesized through grafting organic conjugated chains directly onto an inorganic rigid cage polyhedral oligomeric silsesquioxanes (POSS). The effect of chain length, side groups, polarity of solvents on the property of light emitting dots were studied using FTIR, XRD, DSC, UV, PL, AFM and SEM. The unique structure of these nano-hybrid dots renders them with excellent PL properties which are much different from bulk organic molecules or conjugated polymers. The incorporation of conjugated molecules onto POSS transforms the oligo-conjugated arms from crystalline state to non-crystalline solid which can be solution processed. The PLQE (PL quantum efficiency) of the oligo-conjugated arms in condensed state increases significantly after grafting onto POSS. The light emitting dots are very sensitive to the polarity of organic solvents due to their nano-scaled size. PL spectrum of the nano-hybrid dots in solid film was blue shift from that in most of organic solvents.
通过将有机共轭链直接接枝到无机刚性笼状聚合物八氧化硅烷 (POSS) 上,合成了一系列直径范围从 2 纳米到 4 纳米的纳米杂化发光点。利用FTIR、XRD、DSC、UV、PL、AFM 和 SEM 研究了链长、侧基及溶剂极性对发光点性质的影响。这些纳米杂化点的独特结构赋予它们优异的光致发光(PL)性能,与大宗有机分子或共轭聚合物截然不同。将共轭分子引入POSS,使得寡共轭臂由结晶状态转变为可溶液加工的非结晶固体。接枝到POSS上后,凝聚状态下寡共轭臂的光致发光量子效率(PLQE)显著提高。由于其纳米尺寸,这些发光点对有机溶剂的极性非常敏感。纳米杂化点在固体薄膜中的光致发光光谱相较于大多数有机溶剂发生蓝移。