Abstract
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.
Highlights
Inorganic semiconductor/organic polymer hybrid heterostructures have attracted considerable attention in the past decade due to the strong potential for applications such as efficient microlight sources that can be used in full-color displays, imaging systems, miniature chemical and biological sensors[1]
We have determined that besides a donor-bound exciton (DBE) transition peaking at ~3.47 eV at 5 K, there are defect related lines originating from SFs
At low temperatures and for higher excitation power, the linewidth is inhomogeneously broadened with a full-width at half-maximum (FWHM) of ~20–30 meV at 5 K for DBE and SF emissions
Summary
Inorganic semiconductor/organic polymer hybrid heterostructures have attracted considerable attention in the past decade due to the strong potential for applications such as efficient microlight sources that can be used in full-color displays, imaging systems, miniature chemical and biological sensors[1]. A novel class of hybrid structures has been suggested These hybrids enable efficient non-radiative resonance energy transfer (NRET) between an excitation within an inorganic material and an exciton in a polymer[2,3,4]. The determination of the NRET efficiency can be studied from the exciton dynamics in the presence of the polyfluorene. Other factors such as surface potential effects should be considered when discussing this phenomenon[5,6,7]. The recombination dynamics of different excitonic transitions in as-grown GaN NRs and in hybrid configurations has been studied to evaluate exciton localization conditions satisfying NRET recombination mechanism
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