白光 LED 老化致藍光漏出與其抑制之研究

The Study of Blue Leaking Blocker in Aged Phosphor Converted White LEDs

楊上賦(Shang-Fu Yang)

指導教授 ： 楊宗勳 ； 孫慶成

國立中央大學/理學院/光電科學與工程學系/碩士(2015年)

摘要

在本論文中，為了解決白光 LED 在老化過程中，螢光粉因熱衰導致藍光漏出的問題，摻入了隨溫度變化而產生變色效果的感溫材料在 LED 封裝上，目的在螢光粉溫度過高時，能及時產生變色效果來吸收漏出的藍光。
在實驗中測試與分析多種不同的感溫材料，以及利用熱模擬來預測LED 內部溫度分佈，適當的修改找出最佳的感溫材料幾何外型及位置，並比較有無使用感溫材料的結果差異。

關鍵字

白光發光二極體 ； 老化 ； 藍光漏出抑制 ； 感溫變色材料

並列摘要

In this thesis, we added the thermochromic materials into the pcW-LED to solve the blue light leakage during the pcW-LED aging process. The thermochromic materials could change their color and absorb the leaking blue light immediately when the temperature of the phosphor was too high.
Furthermore, to begin with, we measured and analyzed several different materials in the experiment. Also, we predicted the temperature distribution inside the LED by applying thermal simulation in order to find the best location and shapes of the materials. Finally, we compared the result of the LED which thermochromic materials was applied with the LED without thermochromic materials to see if there were significantly different.

並列關鍵字

White LED ； Aging ； Blue light leakage blocker ； Thermochromic materials

參考文獻

[2] N. J. Holonyak and S. F. Bevaqua, “Coherent (visible) light emission from Ga(As1–xPx) junctions,” Appl. Phys. Lett. 1, 82-83 (1962).

[3] S. Nakamura, M. Senoh, and T. Mukai, “High-power InGaN/GaN double-heterostructure violet light-emitting diodes,” Appl. Phys. Lett. 62, 2390 (1993).

[4] S. Nakamura, T. Mukai, and M. Senoh, “Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes,” Appl. Phys. Lett. 64, 1687-1689 (1994).

[5] S. Nakamura, M. Senoh, N. Iwasa, and S. Nagahama, “High-brightness InGaN blue, green, and yellow light-emitting diodes with quantum well structures,” Jpn. J. Appl. Phys. 34, 797-799 (1995).

[6] S. Nakamura, M. Senoh, S. Nagahama, N. Iwasa, T. Yamada, T. Matsushita, Y. Sugimoto, and H. Kiyoku, “Room-temperature continuous-wave operation of InGaN multi-quantum-well structure laser diodes,” Appl. Phys. Lett. 69, 4056 (1996).