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Packaging Process and Materials Opti...

Shuai, Yun.

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Packaging Process and Materials Optimization for Enhancing Performance of White LED Emitters.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Packaging Process and Materials Optimization for Enhancing Performance of White LED Emitters./
作者:	Shuai, Yun.
面頁冊數:	119 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
Contained By:	Dissertation Abstracts International74-07B(E).
標題:	Engineering, Packaging. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3556403
ISBN:	9781267984036

Packaging Process and Materials Optimization for Enhancing Performance of White LED Emitters.
Shuai, Yun.

Packaging Process and Materials Optimization for Enhancing Performance of White LED Emitters. - 119 p.

Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.

Thesis (Ph.D.)--University of California, Irvine, 2013.

As a rapid developing area, great efforts have been made to replace general lighting and illumination equipment with solid-state technology by employing LEDs, especially high-power white LEDs. There are several approaches to accomplish white emission, one of which is combining a blue LED die and yellow-emitting phosphor, known as the down conversion technique. For phosphor conversion white LED (pc-WLED), the major challenge is to achieve high phosphor conversion efficiency, high extraction efficiency, and high color rendering. This dissertation is focused on addressing the above mentioned issues with WLED packages. It is consisted of two parts: one is the study of packaging parameters and material properties and their influence on performance, such as luminous efficiency, light extraction efficiency, and CCT angular uniformity, of phosphor converted white LED packages; the other part is design of optic components for LED applications, such as secondary lens for LED based backlight units.

ISBN: 9781267984036Subjects--Topical Terms:

1025152
Engineering, Packaging.

Packaging Process and Materials Optimization for Enhancing Performance of White LED Emitters.
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500 $a Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
500 $a Adviser: Frank G. Shi.
502 $a Thesis (Ph.D.)--University of California, Irvine, 2013.
520 $a As a rapid developing area, great efforts have been made to replace general lighting and illumination equipment with solid-state technology by employing LEDs, especially high-power white LEDs. There are several approaches to accomplish white emission, one of which is combining a blue LED die and yellow-emitting phosphor, known as the down conversion technique. For phosphor conversion white LED (pc-WLED), the major challenge is to achieve high phosphor conversion efficiency, high extraction efficiency, and high color rendering. This dissertation is focused on addressing the above mentioned issues with WLED packages. It is consisted of two parts: one is the study of packaging parameters and material properties and their influence on performance, such as luminous efficiency, light extraction efficiency, and CCT angular uniformity, of phosphor converted white LED packages; the other part is design of optic components for LED applications, such as secondary lens for LED based backlight units.
520 $a An optimized packaging geometry with convex phosphor layer is achieved with good CCT uniformity and highest lumen efficiency. It is demonstrated for the first time that the size effect on luminous efficacy is non-monotonic and exhibits minima in the sub-micron size range. Also, it is showed that large polycrystalline phosphors with small nano-size grains are able to enhance light extraction efficiency because of the reduced scattering coefficient. The influence of phosphor film's location and refraction index of silicone encapsulant on light extraction efficiency of pc-WLED package is studied, which demonstrates the relationship between the phosphor location and appropriate choice of pc-WLED materials and packaging parameters. In addition, as an example of WLED application, a freeform axisymmetric secondary optic lens is designed and demonstrated using an improved lens design and optimization scheme.
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650 4 $a Physics, Optics. $3 1018756
650 4 $a Engineering, Materials Science. $3 1017759
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