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White-light light-emitting device based on surface plasmon-enhanced CdSe/ZnS nanocrystal wavelength conversion on a blue/green two-color light-emitting diode

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4 Author(s)
Dong-Ming Yeh ; Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, 1, Roosevelt Road, Section 4, Taipei, Taiwan, Republic of China ; Chi-Feng Huang ; Lu, Yen-Cheng ; Yang, C.C.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2890730 

The authors demonstrate the implementation of a white-light device by spin-coating CdSe/ZnS nanocrystals (NCs) on the top of a blue/green two-color InGaN/GaN quantum-well light-emitting diode for converting blue and green emissions into red light through the absorption/reemission process. Meanwhile, Au nanoparticles are mixed with CdSe/ZnS NCs for generating localized surface plasmon (LSP) modes to couple with the CdSe/ZnS NCs. The LSP modes can absorb green emission and effectively transfer the energy into the CdSe/ZnS NCs through the coupling process for enhancing red emission. With the LSP coupling process, the conversion efficiency from the blue/green range into red light can be increased by around 30%. The conversion quantum efficiency can reach 52.8%.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 9 )

Date of Publication:

Mar 2008

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