TY - JOUR
T1 - Enhancement of light extraction for InGaN LEDs by means of beveled sapphire and cup-shaped copper sheeting
AU - Horng, Ray-Hua
AU - Hu, Hung Lieh
AU - Ou, Sin Liang
AU - Lin, Re Ching
AU - Hsu, Chen Peng
PY - 2012/8/9
Y1 - 2012/8/9
N2 - In this letter, InGaN light-emitting diode (LED) structures fabricated with beveled sapphire substrates and embedded in cup-shaped copper sheets are presented. Using Trace-Pro simulation, the shaped sapphire with an optimum beveled angle of 75° was determined to enhance the light extraction of LEDs. The thermal dissipation for high power LEDs can be improved by embedding them in cup-shaped copper sheets. At an injection current of 350 mA, the output powers of LED with conventional structure and LEDs with original and beveled sapphires, both embedded in cup-shaped copper sheets, are 325.4, 372.6, and 395.6 mW, respectively, while the power efficiencies are 27.6%, 31.5%, and 33.3%, respectively. It indicates that the light extraction and output power of LED devices can be enhanced with the aid of beveled sapphires and cup-shaped copper sheets.
AB - In this letter, InGaN light-emitting diode (LED) structures fabricated with beveled sapphire substrates and embedded in cup-shaped copper sheets are presented. Using Trace-Pro simulation, the shaped sapphire with an optimum beveled angle of 75° was determined to enhance the light extraction of LEDs. The thermal dissipation for high power LEDs can be improved by embedding them in cup-shaped copper sheets. At an injection current of 350 mA, the output powers of LED with conventional structure and LEDs with original and beveled sapphires, both embedded in cup-shaped copper sheets, are 325.4, 372.6, and 395.6 mW, respectively, while the power efficiencies are 27.6%, 31.5%, and 33.3%, respectively. It indicates that the light extraction and output power of LED devices can be enhanced with the aid of beveled sapphires and cup-shaped copper sheets.
KW - Beveled sapphire
KW - cup-shaped copper sheet
KW - InGaN
KW - light extraction
KW - light-emitting diode (LED)
UR - http://www.scopus.com/inward/record.url?scp=84864553157&partnerID=8YFLogxK
U2 - 10.1109/LPT.2012.2203800
DO - 10.1109/LPT.2012.2203800
M3 - Article
AN - SCOPUS:84864553157
SN - 1041-1135
VL - 24
SP - 1421
EP - 1423
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 16
M1 - 6213501
ER -