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000187358 1001_ $$0P:(DE-HGF)0$$aShira, Roza$$b0$$eCorresponding Author
000187358 245__ $$aOrigin of low quantum efficiency of photoluminescence of InP/ZnS nanocrystals
000187358 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2014
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000187358 520__ $$aIn this paper, we study the origin of a strong wavelength dependence of the quantum efficiency of InP/ZnS nanocrystals. We find that while the average size of the nanocrystals increased by 50%, resulting in longer emission wavelength, the quantum efficiency drops more than one order of magnitude compared to the quantum efficiency of the small nanocrystals. By correlating this result with the time-resolved photoluminescence we find that the reduced photoluminescence efficiency is caused by a fast growing fraction of non-emissive nanocrystals while the quality of the nanocrystals that emit light is similar for all samples. Transmission electron microscopy reveals the polycrystalline nature of many of the large nanocrystals, pointing to the grain boundaries as one possible site for the photoluminescence quenching defects.
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000187358 7001_ $$0P:(DE-Juel1)144926$$aKovacs, Andras$$b1$$ufzj
000187358 7001_ $$0P:(DE-HGF)0$$aDan Corell, Dennis$$b2
000187358 7001_ $$0P:(DE-HGF)0$$aGritti, Claudia$$b3
000187358 7001_ $$0P:(DE-HGF)0$$aThorseth, Anders$$b4
000187358 7001_ $$0P:(DE-HGF)0$$aDam-Hansen, Carsten$$b5
000187358 7001_ $$0P:(DE-HGF)0$$aPetersen, Paul Michael$$b6
000187358 7001_ $$0P:(DE-Juel1)145316$$aKardynal, Beata$$b7$$ufzj
000187358 773__ $$0PERI:(DE-600)1491401-3$$a10.1016/j.jlumin.2013.09.013$$p936-939$$tJournal of luminescence$$v145$$x0022-2313$$y2014
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