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Surface transformation and photoinduced recovery in CdSe nanocrystals
B C Hess1, I G Okhrimenko, R C Davis
1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84062, USA.
Physical Review Letters
|April 6, 2001
Abstract:
CdSe nanocrystals in solution and films can enter a metastable state in which the highly luminescent nanocrystals become dark. This change, which we attribute to a surface transformation, can be caused by heating or by changing the environment of the nanocrystals at room temperature. The metastable transformation is reversed upon illumination of above-band-gap light, at which point the nanocrystals are again highly luminescent.