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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 26872–26878

Voltage controlled photoluminescence blinking in CdSe nano-particles

Horng-Shyang Chen, Tao-Hsiang Chung, Ming-Chou Lin, Yann-Wen Lan, Chii-Dong Chen, and Hung-Yi Lin  »View Author Affiliations


Optics Express, Vol. 18, Issue 26, pp. 26872-26878 (2010)
http://dx.doi.org/10.1364/OE.18.026872


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Abstract

Voltage controlled photoluminescence (PL) blinking behavior in CdSe nano-particles (NPs) is studied. The NPs are sandwiched between a p-type silicon substrate and a thin Au electrode, which serve respectively as source and drain electrodes. The blinking PL from the NPs can be controlled by the bias voltage across the two electrodes. However, luminescence diminishes when photo excitation power is weak or bias is lower than a threshold voltage. The observed PL blinking is explained by a circuit model, which involves charge tunneling, Fowler-Nordheim (F-N) emission, and charging effect. The blinking intensity is controlled by the number of F-N emitted electrons whereas the pulse interval is associated with the time required for hole accumulation in the NPs. The intensity of luminescence blinking for NP clusters is found to be much higher compared to that of blinking from isolated NPs. This is explained by a collective recombination of F-N emitted electrons and accumulated holes in the NP clusters. This study provides a simple way of controlling PL blinking.

© 2010 OSA

OCIS Codes
(000.0000) General : General
(000.2700) General : General science

ToC Category:
Optoelectronics

History
Original Manuscript: October 14, 2010
Revised Manuscript: November 29, 2010
Manuscript Accepted: December 1, 2010
Published: December 7, 2010

Citation
Horng-Shyang Chen, Tao-Hsiang Chung, Ming-Chou Lin, Yann-Wen Lan, Chii-Dong Chen, and Hung-Yi Lin, "Voltage controlled photoluminescence blinking in CdSe nano-particles," Opt. Express 18, 26872-26878 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-26-26872


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