White light generation with CdSe-ZnS nanocrystals coated on an InGaN-GaN quantum-well blue/Green two-wavelength light-emitting diode
| Autor: | Jian-Jang Huang, I-Shuo Liu, Chih-Chung Yang, Wen-Yu Shiao, Horng-Shyang Chen, Wei-Fang Su, Chih-Feng Lu, Chi-Feng Huang, Dong-Ming Yeh |
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| Rok vydání: | 2006 |
| Předmět: |
Diffraction
Photoluminescence Materials science business.industry Electroluminescence Epitaxy Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Wavelength Optics law Optoelectronics Electrical and Electronic Engineering business Quantum well Light-emitting diode Diode |
| Zdroj: | IEEE Photonics Technology Letters. 18:1430-1432 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2006.877551 |
| Popis: | 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 photoluminescence 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 |
| Databáze: | OpenAIRE |
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