Enhanced Light Extraction Using Blue LED Package Consisting of -Doped Silicone Layer and Silicone Lens

A novel, blue light-emitting diode (LED) packaging structure with improved light and thermal characteristics is presented. The package includes a TiO 2 -doped silicone layer and silicone lens. This dual-layer graded refractive index structure used for LED encapsulation was fabricated using dispensin...

Full description

Saved in:
Bibliographic Details
Published in:IEEE electron device letters 2014-05, Vol.35 (5), p.575-577
Main Authors: Su, Yan-Kuin, Wang, Pin-Chao, Lin, Chun-Liang, Huang, Guan-Syun, Wei, Chi-Min
Format: Article
Language:English
Subjects:
dispensing technology
dual-layer graded refractive index
Encapsulation
Junctions
Lenses
Light emitting diodes
Light-emitting diode (LED)
Materials
Refractive index
silicone lens
TiO₂-doped silicone
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A novel, blue light-emitting diode (LED) packaging structure with improved light and thermal characteristics is presented. The package includes a TiO 2 -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 TiO 2 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.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2014.2311151