White Light-Emitting Diodes Efficiency Improve Study of High Color Rendering Index
| Autor: | Wen-Lung Su, 蘇文龍 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 For the huge demand of lighting and LCD back light area, high power package is needed fot LED light source with good efficiency and good color rendering index (CRI) larger than 85. The most convenient way is using red and green mixed phosphors stimulated with blue LED chip. However, due to the reach sorption of green light for the red phosphor, the efficiency is low. In this thesis, we propose a layered structure that seperates the green and red phosphors. Because of the index difference in each layer, the light extraction efficiency can be improved by about 5 to 8 mW. The simulation tool TracePro is utilige to verify the experiment’s results, and they are consistant. With this novel layered structure, the overall light output power efficiency can be raised by 5% and the CRI is 91. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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