DocumentCode :
52712
Title :
Enhanced Light Extraction Using Blue LED Package Consisting of 
-Doped Silicone Layer and Silicone Lens
Author :
Yan-Kuin Su ; Pin-Chao Wang ; Chun-Liang Lin ; Guan-Syun Huang ; Chi-Min Wei
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng-Kung Univ., Tainan, Taiwan
Volume :
35
Issue :
5
fYear :
2014
fDate :
May-14
Firstpage :
575
Lastpage :
577
Abstract :
A novel, blue light-emitting diode (LED) packaging structure with improved light and thermal characteristics is presented. The package includes a TiO2-doped silicone layer and silicone lens. This dual-layer graded refractive index structure used for LED encapsulation was fabricated using dispensing technology. In the LEDs doped with TiO2 nanoparticles and a silicone lens, the light scattering capability and average refraction index of silicone were enhanced, thus reducing reflection losses. The LED achieved a light extraction efficiency increase of 24.5% and a junction temperature reduction of 12.1 °C compared with a conventional single-layer encapsulated LED. Consequently, the proposed structure not only improved the LED performance, but also reduced thermal accumulation in the packaging.
Keywords :
encapsulation; lenses; light emitting diodes; light scattering; nanoparticles; packaging; refractive index; silicones; titanium compounds; TiO2; TiO2-doped silicone layer; blue LED package; dispensing technology; dual-layer graded refractive index structure; enhanced light extraction; junction temperature reduction; light characteristics; light scattering; light-emitting diode; nanoparticles; reflection losses; silicone lens; thermal accumulation; thermal characteristics; Encapsulation; Junctions; Lenses; Light emitting diodes; Materials; Refractive index; ${rm TiO}_{2}$ -doped silicone; Light-emitting diode (LED); TiO₂-doped silicone; dispensing technology; dispensing technology.; dual-layer graded refractive index; silicone lens;
fLanguage :
English
Journal_Title :
Electron Device Letters, IEEE
Publisher :
ieee
ISSN :
0741-3106
Type :
jour
DOI :
10.1109/LED.2014.2311151
Filename :
6778773
Link To Document :
