White light generation with CdSe-ZnS nanocrystals coated on an InGaN-GaN quantum-well blue/green two-wavelength light-emitting diode
Journal
IEEE Photonics Technology Letters
Journal Volume
18
Journal Issue
13
Pages
1430-1432
Date Issued
2006
Author(s)
Chen, Horng-Shyang
Yeh, Dong-Ming
Lu, Chih-Feng
Huang, Chi-Feng
Shiao, Wen-Yu
Yang, C. C.
Liu, I.-Shuo
Abstract
We grew and processed a blue/green two-wavelength light-emitting diode (LED) based on the mixture of two kinds of quantum wells (QW) in epitaxial growth. The X-ray diffraction and photoluminesccnce measurements indicated that the crystalline structure and the basic optical property of individual kinds of QW are not significantly changed in the mixed growth. The relative electroluminescence (EL) intensity of the two colors depends on the injection current level, which controls the hole concentration distribution among the QWs. At low injection levels, the top green-emitting QW dominates in EL. As the injection current increases, the blue-emitting QWs beneath become dominating. We also coated CdSe-ZnS nanocrystals on the top of the two-wavelength LED for converting blue photons into red light. With the coating of such nanocrystals, the device emits blue, green, and red lights for white light generation. © 2006 IEEE.
Type
journal article
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