東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Thermal management of remote phospho...

Perera, Ukwatte Lokuliyanage Indika Upendra.

Linked to FindBook

Google Book

Amazon

博客來

Thermal management of remote phosphor layer in a light-emitting diode system.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Thermal management of remote phosphor layer in a light-emitting diode system./
Author:	Perera, Ukwatte Lokuliyanage Indika Upendra.
Description:	68 p.
Notes:	Source: Masters Abstracts International, Volume: 52-05.
Contained By:	Masters Abstracts International52-05(E).
Subject:	Engineering, Architectural. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1552760
ISBN:	9781303736742

Thermal management of remote phosphor layer in a light-emitting diode system.
Perera, Ukwatte Lokuliyanage Indika Upendra.

Thermal management of remote phosphor layer in a light-emitting diode system. - 68 p.

Source: Masters Abstracts International, Volume: 52-05.

Thesis (M.S.)--Rensselaer Polytechnic Institute, 2013.

From the indicator-type light-emitting diode (LED) to the high-power illuminator-type LED, the evolution of solid-state lighting rests heavily on the extraction of generated heat from the LED chip. With the increase in lumen packages of high-power LEDs, the LED chip as well as the down-conversion phosphors require dedicated paths to dissipate the excess heat created in a smaller volume inside the LED package. If not properly dissipated, both short-term and long-term performance of the LED will be compromised. The goal of this study was to evaluate the feasibility of a thermal management technique to reduce the phosphor operating temperature without adversely affecting optical efficiency. The heat generated in the phosphor locations, due to phosphor quantum inefficiency and Stokes shift losses, accumulates around the local volume due to the low thermal conductivity of the phosphor binding material. This issue is compounded as the localized heat builds up within the phosphor binding material, causing phosphor quenching and degrading the binding material, resulting in more absorption of visible radiation and in turn building up more heat. The increase in temperature contributes to faster degradation of light in the short and long term. In response to the need for thermal management of the phosphor layer, an experimental study was conducted to evaluate and quantify the effectiveness of a method to dissipate the heat generated in the phosphor layer to the ambient. The experimental findings verified the feasibility of the method, but it reduced the luminous flux from the package due to surface absorption of photons by the structure used for dissipating the heat. A discussion at the end includes how to overcome the light trapping issue and improve the method used to lower the phosphor layer temperature without reducing the luminous flux.

ISBN: 9781303736742Subjects--Topical Terms:

1671790
Engineering, Architectural.

Thermal management of remote phosphor layer in a light-emitting diode system.
LDR:02702nam a2200265 4500 001 1962527
005 20140819094458.5
008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303736742
035 $a (MiAaPQ)AAI1552760
035 $a AAI1552760
040 $a MiAaPQ $c MiAaPQ
100 1 $a Perera, Ukwatte Lokuliyanage Indika Upendra. $3 2098617
245 1 0 $a Thermal management of remote phosphor layer in a light-emitting diode system.
300 $a 68 p.
500 $a Source: Masters Abstracts International, Volume: 52-05.
500 $a Adviser: Nadarajah Narendran.
502 $a Thesis (M.S.)--Rensselaer Polytechnic Institute, 2013.
520 $a From the indicator-type light-emitting diode (LED) to the high-power illuminator-type LED, the evolution of solid-state lighting rests heavily on the extraction of generated heat from the LED chip. With the increase in lumen packages of high-power LEDs, the LED chip as well as the down-conversion phosphors require dedicated paths to dissipate the excess heat created in a smaller volume inside the LED package. If not properly dissipated, both short-term and long-term performance of the LED will be compromised. The goal of this study was to evaluate the feasibility of a thermal management technique to reduce the phosphor operating temperature without adversely affecting optical efficiency. The heat generated in the phosphor locations, due to phosphor quantum inefficiency and Stokes shift losses, accumulates around the local volume due to the low thermal conductivity of the phosphor binding material. This issue is compounded as the localized heat builds up within the phosphor binding material, causing phosphor quenching and degrading the binding material, resulting in more absorption of visible radiation and in turn building up more heat. The increase in temperature contributes to faster degradation of light in the short and long term. In response to the need for thermal management of the phosphor layer, an experimental study was conducted to evaluate and quantify the effectiveness of a method to dissipate the heat generated in the phosphor layer to the ambient. The experimental findings verified the feasibility of the method, but it reduced the luminous flux from the package due to surface absorption of photons by the structure used for dissipating the heat. A discussion at the end includes how to overcome the light trapping issue and improve the method used to lower the phosphor layer temperature without reducing the luminous flux.
590 $a School code: 0185.
650 4 $a Engineering, Architectural. $3 1671790
690 $a 0462
710 2 $a Rensselaer Polytechnic Institute. $b Lighting. $3 2098618
773 0 $t Masters Abstracts International $g 52-05(E).
790 $a 0185
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1552760