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| 研究生： |
陳榮裕 Chen, Jung-yue |
|---|---|
| 論文名稱： |
底座溫度與驅動電流對高功率LED特性影響之研究 A study of the effect of substrate temperature and driving current on the characteristics of high power LEDs |
| 指導教授： |
周榮華
Chou, Jung-Hua |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工學院 - 工程科學系碩士在職專班 Department of Engineering Science (on the job class) |
| 論文出版年： | 2008 |
| 畢業學年度： | 96 |
| 語文別： | 中文 |
| 論文頁數： | 164 |
| 中文關鍵詞： | 驅動電流 、LED穩定性 、發光效率 、色度偏移 、高功率LED 、底座溫度 |
| 外文關鍵詞： | high power LED, substrate temperature, driving current, color shifting, luminous efficiency, LED stability |
| 相關次數： | 點閱：148 下載：1 |
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本論文主旨係研究不同款LED (LUXEON-Rebel、LUXEON-Emitter、Osram-Golden Dragon)在不同底座溫度、驅動電流下，其光學、電氣及效率特性之影響，並評估其穩定性。本實驗將環境溫度控制在24±1℃的範圍內，其主動變數為驅動電流(100~400mA)及底座溫度(25℃~70℃)；應變變數為光通量、主波長、峰波長、半高寬、XY色度與電氣特性(驅動電壓)及發光效率。
本研究結果發現：首先，隨底座溫升R,G,B-LED之光通量降低；主波長及峰波長均以近線性趨勢往長波長偏移；半高寬變寬；XY色度值部分，R,G-LED均往右下角偏移，B-LED往左上角偏移；R,G-LED之發光效率均降低，B-LED則微幅上升。又隨驅動電流增加R,G,B-LED之光通量增加；主波長往短波長偏移；R-LED之峰波長往長波長偏移，B,G-LED均往短波長偏移；半高寬變寬；XY色度值部分，R-LED往左上角偏移，G-LED往左下角偏移，B-LED靠右偏移；發光效率均下降。
就穩定性而言，定電流(350mA)下，隨底座溫升R-LED均以Emitter較穩定，G-LED均以Osram較穩定，B-LED則略有差異，以光通量變化量作分析，Emitter較穩定，以發光效率變化量下作分析，則以Rebel較穩定；定溫(50°C)下，隨電流增加R,G-LED均以Emitter較穩定，B-LED則略有差異，以光通量變化量作分析，Rebel較穩定，以發光效率變化量下作分析，Osram較穩定。
The purpose of this thesis is to study the characteristics of three high power R,G,B-LEDs (LUXEON-Rebel, LUXEON-Emitter, Osram-Golden Dragon) under the conditions of different substrate temperatures and driving currents. The driving current varies from 100 to 400mA and the substrate temperature from 25℃ to 70℃. The characteristics examined include the luminous flux and efficiency, main wavelength, peak wavelength, full width at half amplitude, chromaticity and induced voltage. The ambient temperature is control LED within the range of 24±1℃ for all the experiments.
Key observations are as follows. With increasing substrate temperatures, the luminous flux reduces, the main wavelength and peak wavelength linearly shift to long wavelengths, and full width at half amplitude widens. The x, y chromaticity makes a right-down shift for R,G-LEDs and left-up shift for B-LED. The luminous efficiency of R,G-LEDs reduces whereas that of B-LED increases slightly. With increasing driving current, the luminous flux increases. The main wavelength shifts to wavelengths while the peak wavelength of R-LED shifts to a long wavelength shift and those of B,G-LEDs to short wavelengths. The full width at half amplitude enlarges. The x, y chromaticity of R-LED exhibits a right-up shift, G-LED a left-down shift and G-LED a right shift. All of the luminous efficiencies of R,G,B-LEDs reduce.
The stability in terms of substrate temperature variation, the red Emitter LED and Osram’s G-LED are most stable. With increasing driving currents, the Emitter red and green LEDs are most stable.
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校內：2009-08-25公開校外：2009-08-25公開