Forsberg Mathias, Serban Elena Alexandra, Hsiao Ching-Lien, Junaid Muhammad, Birch Jens, Pozina Galia
Thin Film Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, S-581 83, Linköping, Sweden.
Sci Rep. 2017 Apr 26;7(1):1170. doi: 10.1038/s41598-017-01052-4.
Novel hybrid organic-inorganic nanostructures fabricated to utilize non-radiative resonant energy transfer mechanism are considered to be extremely attractive for a variety of light emitters for down converting of ultaviolet light and for photovoltaic applications since they can be much more efficient compared to devices grown with common design. Organic-inorganic hybrid structures based on green polyfluorene (F8BT) and GaN (0001) nanorods grown by magnetron sputtering on Si (111) substrates are studied. In such nanorods, stacking faults can form periodic polymorphic quantum wells characterized by bright luminescence. In difference to GaN exciton emission, the recombination rate for the stacking fault related emission increases in the presence of polyfluorene film, which can be understood in terms of Förster interaction mechanism. From comparison of dynamic properties of the stacking fault related luminescence in the hybrid structures and in the bare GaN nanorods, the pumping efficiency of non-radiative resonant energy transfer in hybrids was estimated to be as high as 35% at low temperatures.
利用非辐射共振能量转移机制制备的新型有机-无机杂化纳米结构，被认为对各种用于紫外光下转换的发光体以及光伏应用极具吸引力，因为与采用常规设计生长的器件相比，它们的效率可能更高。研究了基于绿色聚芴（F8BT）和通过磁控溅射在Si（111）衬底上生长的GaN（0001）纳米棒的有机-无机杂化结构。在这种纳米棒中，堆垛层错可以形成以明亮发光为特征的周期性多晶量子阱。与GaN激子发射不同，在聚芴薄膜存在的情况下，与堆垛层错相关发射的复合率会增加，这可以用Förster相互作用机制来解释。通过比较杂化结构和裸GaN纳米棒中与堆垛层错相关发光的动态特性，估计在低温下杂化结构中非辐射共振能量转移的泵浦效率高达35%。
