白光LED之螢光粉熱衰探討; Thermal effect on phosphors applied in LEDs

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题名:	白光LED之螢光粉熱衰探討;Thermal effect on phosphors applied in LEDs
作者:	劉瑋瑋;Wei-Wei Liu
贡献者:	光電科學研究所
关键词:	熱衰;螢光粉;發光二極體;LED;Phosphor;Thermal Effect
日期:	2011-07-18
上传时间:	2012-01-05 14:35:11 (UTC+8)
摘要:	在本論文中，為了解現今白光LEDs於正常驅動下，晶片產生的熱對螢光粉造成的效應，於是我們建立了一套螢光粉熱衰的光學量測架構與流程，且對實驗架構進行公差分析，將此系統對目前白光LEDs常用的螢光粉體進行熱衰研究，實驗中除了探討螢光粉遇熱時的頻譜變化及出光效率的改變外，亦對螢光粉熱衰行為，進行濃度、厚度與粒子數的實驗與分析，以數據化的方式呈現結果。期待在未來能將螢光粉熱衰行為運用來預測LEDs的整體光學行為，並提供準確的數據和建議。 The heat was inevitably generated from chips when light-emitting diodes (LEDs) were driven at working current. The quantity of heat affects the characteristic of phosphors. This thesis devoted to study the thermal effect on different kinds of phosphors that are commonly used in LEDs. This study establish an experimental setup and procedures which was analyzed its tolerance to derive this phenomenon. Except for measuring the shift in spectrum and thermal degradation in phosphors, this study also vary distinct parameters such as concentration, thickness, and particle numbers to study the correlation between the optical properties. It is possible to anticipate the optical performance when combining the luminescent behaviour of phosphor under thermal aging to provide accurate proposition in the future.
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