Electric Field Effects on Photoluminescence of CdSe Nanoparticles in a PMMA Film

Crystals

Takakazu Nakabayashi¹  Ruriko Ohshima² 

[1]Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo 001-0020, Japan

关键词: CdSe;    electric field effects;    photoluminescence;    field-induced quenching;   

DOI  :  10.3390/cryst4020152

来源: mdpi

【 摘 要 】

External electric field effects on spectra and decay of photoluminescence (PL) as well as on absorption spectra were measured for CdSe nanoparticles in a poly(methyl methacrylate) (PMMA) film. Electrophotoluminescence (E-PL) spectra as well as electroabsorption spectra show a remarkable Stark shift which depends on the particle size, indicating a large electric dipole moment in the first exciton state. The E-PL spectra also show that PL of CdSe is quenched by application of electric fields, and the magnitude of the field-induced quenching becomes larger with increasing size. The PL decay profiles observed in the absence and presence of electric field show that the field-induced quenching of PL mainly originates from the field-induced decrease in population of the emitting state prepared through the relaxation from the photoexcited state.

【 授权许可】

CC BY   
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