Nano Archive

Red light emitting solid state hybrid quantum dot-near-UV GaN LED devices

Song, Hongjoo and Lee, Seonghoon (2007) Red light emitting solid state hybrid quantum dot-near-UV GaN LED devices. NANOTECHNOLOGY, 18 (25).

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We produced core–shell (CdSe)ZnSe quantum dots by direct colloidal chemical synthesis and the surface-passivation method—an overcoating of the core CdSe with a larger-bandgap material ZnSe. The (CdSe)ZnSe quantum dots(QDs) play the role of a colour conversion centre. We call these quantum dots nanophosphors. We fabricated red light emitting hybrid devices of (CdSe)ZnSe QDs and a near-UV GaN LED by combining red light emitting (CdSe)ZnSe quantum dots (as a colour conversion centre) with a near-UV(NUV) GaN LED chip (as an excitation source). A few good red phosphors have been known for UV excitation wavelengths, and red phosphors for UV excitation have been sought for a long time. Here we tested the possibility of using (CdSe)ZnSe QDs as red nanophosphors for UV excitation. The fabricated red light emitting hybrid device of (CdSe)ZnSe and a NUV GaN LED chip showed a good luminance. We demonstrated that the (CdSe)ZnSe quantum dots were promising red nanophosphors for NUV excitation and that a red LED made of QDs and a NUV excitation source was a highly efficient hybrid device.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Physical Science > Quantum phenomena
Physical Science > Photonics
Engineering > Nanotechnology applications in ICT
ID Code:6227
Deposited By:IoN
Deposited On:14 Jan 2010 16:23
Last Modified:14 Jan 2010 16:23

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