Uncovering forbidden optical transitions in PbSe nanocrystals.
The 1S(h,e)-1P(e,h) exciton transition energy of PbSe nanocrystals was determined via two-photon photoluminescence excitation spectroscopy and was found to be in good agreement with predictions from a tight-binding calculation. The two-photon excitation peak occurs at energies very close to a strong feature in the one-photon absorption spectrum and suggests that it should be assigned as a formally forbidden S-P transition. Leading explanations for the unusual strength of the forbidden transition are discussed.
Peterson
Jeffrey J
JJ
Department of Chemistry, University of Rochester, Rochester, NY, USA.
Huang
Libai
L
Delerue
Christophe
C
Allan
Guy
G
Krauss
Todd D
TD
D004563:Electrochemistry; D007854:Lead / Q000737:chemistry*; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry*; D017785:Photons; D012643:Selenium / Q000737:chemistry*; D013057:Spectrum Analysis
D007854:Lead; D012643:Selenium