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Photoluminescence enhancement in CdS nanoparticles by surface-plasmon resonance

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9 Author(s)
Jung, Dae-Ryong ; WCU Hybrid Materials Program, Department of Materials Science and Engineering, and Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Korea ; Kim, Jongmin ; Nam, Seunghoon ; Nahm, Changwoo
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To examine the influence of metal nanoparticles on the photoluminescence of semiconductors, colloidal mixtures of CdS and Au nanoparticles were prepared with different CdS/Au fractions. Compared to the cadmium-sulfide nanocrystals (quantum efficiency ≅ 7%), the CdS/Au mixtures showed enhanced luminescence properties (quantum efficiency ≅ 14%). The existence of an optimum ratio of metal to semiconductor nanoparticles for the photoluminescence intensity indicates that interactions between the metal and semiconductor nanoparticles induced by surface-plasmon resonance occur constructively at appropriate distances.

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Applied Physics Letters  (Volume:99 ,  Issue: 4 )