| 研究生: |
于曉璇 Yu, Hsiao-Hsuan |
|---|---|
| 論文名稱: |
奈米導熱複合材料於LED發光效率之研究 Study of High Thermal Conductive Nanocomposite Materials for LED Illumination Efficiency |
| 指導教授: |
黃明志
Huang, Ming-Zhi 沈聖智 Shen, Sheng-Chih |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 系統及船舶機電工程學系 Department of Systems and Naval Mechatronic Engineering |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 中文 |
| 論文頁數: | 64 |
| 中文關鍵詞: | 導熱材料 、熱阻量測 、奈米粉末 、LED晶片 、發光效率 |
| 外文關鍵詞: | LED chip, thermal conductive material, thermal resistance measurement, nano-powder, illumination efficiency |
| 相關次數: | 點閱:85 下載:0 |
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本論文主要探討係直接運用熱傳導方式冷卻時,以LED晶片的接面材料(Die attach material)固晶後,對LED光輸出效率之影響。由於LED晶片溫度越高,其發光效率下降,壽命縮短,且損壞率亦增加。故本文實驗中提出以使用奈米碳管、奈米碳球、石墨以及鑽石等材質之粉末,分別加入原始固晶銀膠,過程中改變各種材質摻雜的濃度或互相混合的比例,製做成奈米複合材料,分別觀察其導熱性。利用本文所設計的熱阻量測之實驗模組中,所架設的結構內埋入熱電偶,並量測溫度後經計算,了解奈米複合材料的熱傳導特性後,再應用於LED模組,且以紅外線熱像儀所拍攝測得之晶片溫度,探討奈米複合材料與原始銀膠為固晶材料時,對LED光輸出之影響,最終能立即改善LED晶片之散熱效果,並且間接提升發光效率與壽命。
由熱阻量測結果顯示,以混合材料中的奈米碳球與石墨之粉末各1.5wt%之比例摻雜在銀膠內之效果最為顯著,而應用於LED且操作電流為700mA時,其晶片溫度為62.6℃,相較原始銀膠之晶片溫度為98.5℃;又另在操作電流350mA經72小時後,原始銀膠之LED晶片照度約剩71.7%,而奈米複合材料之LED晶片照度仍有80.3%,可證實奈米複合材料使導熱性大幅改善時,可提升LED的發光效率。
This thesis presents LED thermal dissipation and illumination efficiency using different nanocomposite material with direct thermal conductive method. Since the temperature of LED chip is higher gradually, the luminous efficiency of LED would drop, shorten lifetime, and even increase the failure rate. Therefore, this thesis uses powder of carbon nanotube(CNT), carbon nanocapsules(CNC), graphite, and diamond doping into original Ag-epoxy for die bond, as well as observes LED thermal dissipation when changing the doping/mixing concentration. This thesis designs an experimental module to measure temperature by thermocouples inside the module, and calculates thermal resistances of different samples. Finally, chooses two samples to apply in LED for thermal dissipation and illumination.
As results, from the experimental module, it shows the best performance when the sample is mixed with CNC 1.5% and Graphite 1.5% in Ag-epoxy, and when the operating current of LED is 700mA, its temperature of the chip is 62.6℃. Comparing with 98.5℃ of original Ag-epoxy, the sample with nanocomposite material performs better. Then after 72 hours later in 350mA current, the LED illumination of the original Ag-epoxy sample remains only 71.7%, but the sample mixed of CNC 1.5% and Graphite 1.5% in Ag-epoxy still remains 80.3% for. This study confirms using nanocomposite material can improve LED thermal dissipation, and also promote LED illumination efficiency.
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校內:2023-01-01公開