Title page for 945201051

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Student Number 945201051
Author Chun-Kai Wang(王俊凱)
Author's Email Address fender2934@yahoo.com.tw
Statistics This thesis had been viewed 1520 times. Download 1454 times.
Department Electrical Engineering
Year 2006
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Linear Cascade Arrays of GaN Based Green Light Emitting Diodes for High-Speed and High-Power Performance
Date of Defense 2007-07-04
Page Count 48
  • Cascade
  • GaN
  • Light-emitting-Diode
  • Abstract 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.
    Table of Content 摘要i
    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
    第四章 串接式氮化鎵發光二極體量測結果與討論27
    第五章 結論35
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  • Jin-Wei Shi(許晉瑋)
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    Date of Submission 2007-07-17

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