Photo-dynamic Burstein-Moss doping of PbS quantum dots in solution by single and twophoton optical pumping
Por:
Ullrich B., Barik P., Singh A.K., García-Ramírez E.V., Reyes-Esqueda J.A.
Publicada:
1 nov 2015
Categoría:
Electronic, Optical and Magnetic Materials
Resumen:
We report photo-dynamically provoked photoluminescence blue shifts up to ~8 meV of oleic acid capped 2.5 nm PbS quantum dots in toluene at room temperature. Exposing the solution to pulsed laser (26 ps, 10 Hz) emissions at 532 nm and 1064 nm, the photo-induced band gap increase is evoked by single and two-photon transitions, respectively. The emission peak blue shifts, recorded in reflection and transmission geometries, show a 2/3 power dependence on the optical stimulus gain, rendering the Burstein-Moss shift to be the underlying inherent n-type doping effect in the quantized colloid. © 2015 Optical Society of America.
Filiaciones:
Ullrich B.:
Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico
Barik P.:
Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico
Singh A.K.:
Univ Nacl Autonoma Mexico, Inst Ciencias Fis, Cuernavaca 62210, Morelos, Mexico
García-Ramírez E.V.:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Reyes-Esqueda J.A.:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
All Open Access; Gold
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