高速、高功率串接式可見光發光二極體

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姓名

王俊凱(Chun-Kai Wang) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

高速、高功率串接式可見光發光二極體
(Linear Cascade Arrays of GaN Based Green Light Emitting Diodes for High-Speed and High-Power Performance)

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摘要(中)

在本論文中，我們成功展示出在520nm波段，利用串接的方式來改善大型化後發光二極體的輸出功率以及外部量子效率。我們將串聯的數目從一顆提升到四顆，在相同操作電流下，輸出功率和單顆發光二極體比較確實可以達到四倍的改善。之後，我們進行串接式發光二極體在調變速度上的表現，在相同操作電流下，四顆和單顆有相似的3-dB頻寬約90MHz。
從以上量測結果，我們推論串接的方式確實可以擁有增強外部量子效率的優點，降低發光二極體大型化後面臨到電流壅塞的問題和3-dB頻寬的衰減，雖然串接式發光二極體驅動電壓相對線性地增加，但我們可以將元件運用在特殊操作電壓的系統上，像是車用電力系統方面等。

摘要(英)

We demonstrate a linear cascade GaN based Light Emitting Diode (LED) arrays at a wavelength around ~520nm for improving the output power and differential efficiency of a single LED. Arrays with up to four LEDs connected in series, we can achieve four times improvement of output power under the same bias current (differential quantum efficiency) compared with the control, which is a single LED.
We have also measured their modulation-speed performance and both devices show similar 3-dB bandwidth (90MHz) under the same bias currents. The measurement results indicate that the cascade connection has the advantages of greatly enhanced external differential efficiency and the ability to be driven by the constant-voltage power supply directly. The current crowding problem and degradation of RC-limited bandwidth in large active area LED can also be minimized through the use of such connection.

關鍵字(中)

★ 串接式
★ 氮化鎵
★ 發光二極體

關鍵字(英)

★ Cascade
★ GaN
★ Light-emitting-Diode

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 v
圖表目錄 vii
第一章導論 1
§1-1 發光二極體之簡介 1
§1-2 發光二極體在車上的應用 3
§1-3 塑膠光纖之發展趨勢與其應用 5
§1-4 塑膠光纖損耗及光源 9
§1-5 研究動機和論文架構 11
第二章串接式氮化鎵發光二極體之分析 12
§2-1 氮化鎵發光二極體電流壅塞效應 12
§2-2 發光二極體調制速度之限制 16
§2-3 發光二極體對於車用特殊電壓所面臨問題 17
§2-4 串接式發光二極體 18
第三章串接式氮化鎵發光二極體元件結構及製程 19
§3-1串接式氮化鎵發光二極體元件結構 19
§3-2串接式氮化鎵發光二極體製作流程 20
第四章串接式氮化鎵發光二極體量測結果與討論 27
§4-1.串接式氮化鎵發光二極體之電特性量測 27
§4-2.串接式氮化鎵發光二極體之光特性量測 28
§4-3.串接式氮化鎵發光二極體調變速度之量測 32
第五章結論 35
參考文獻 36

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指導教授

許晉瑋(Jin-Wei Shi)

審核日期

2007-7-17

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