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Random Lasing in Self‐Assembled Dye‐Doped Latex Nanoparticles: Packing Density Effects
Author(s) -
Cerdán Luis,
Costela Angel,
Enciso Eduardo,
GarcíaMoreno Inmaculada
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201202616
Subject(s) - materials science , dispersity , rhodamine 6g , nanoparticle , lasing threshold , polymer , atomic packing factor , doping , chemical engineering , nanotechnology , random laser , sphere packing , chemical physics , optics , polymer chemistry , optoelectronics , fluorescence , composite material , crystallography , wavelength , chemistry , physics , engineering
Efficient random lasing (RL) from self‐assembled dye‐doped latex nanoparticles ( d = 50–380 nm) presenting size polydispersity is reported. This new system exhibits a very good chemical compatibility between dye (Rhodamine 6G) and polymer as well as a high refractive index contrast between nanoparticle and surroundings (air), in such a way that its emission properties surpass the ones previously reported in similar systems. Furthermore, this system allows analyzing in detail the effects of the nanoparticle size polydispersity and the packing density on the RL emission properties. It is shown that size polydispersity gives rise to non‐uniformities in the filling fraction along the sample that lead to fluctuations on the scattering length across the sample and thus to a variation on the emission properties. Finally, it is observed that the increase of the filling fraction, enabled by the use of binary mixtures of nanoparticles with different sizes, results in remarkable improvements in the RL emission properties.