TY - JOUR
T1 - Nanopatterned yttrium aluminum garnet phosphor incorporated film for high-brightness GaN-based white light emitting diodes
AU - Cho, Joong Yeon
AU - Park, Sang Jun
AU - Ahn, Jinho
AU - Lee, Heon
N1 - Funding Information:
This research was supported by the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF), funded by the Korean Ministry of Education, Science and Technology ( 2012M3A7B4035323 ) and LG Innotek—Korea University Nano-Photonics Program .
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014/11/3
Y1 - 2014/11/3
N2 - In this study, we fabricated high-brightness white light emitting diodes (LEDs) by developing a nanopatterned yttrium aluminum garnet (YAG) phosphor-incorporated film. White light can be obtained by mixing blue light from a GaN-based LED and yellow light of the YAG phosphor-incorporated film. If white light sources can be fabricated by exciting proper yellow phosphor using blue light, then these sources can be used instead of the conventional fluorescent lamps with a UV source, for backlighting of displays. In this work, a moth-eye structure was formed on the YAG phosphor-incorporated film by direct spin-on glass (SOG) printing. The moth-eye structures have been investigated to improve light transmittance in various optoelectronic devices, including photovoltaic solar cells, light emitting diodes, and displays, because of their anti-reflection property. Direct SOG printing, which is a simple, easy, and relatively inexpensive process, can be used to fabricate nanoscale structures. After direct SOG printing, the moth-eye structure with a diameter of 220 nm was formed uniformly on the YAG phosphor-incorporated film. As a result of moth-eye patterning on the YAG phosphor-incorporated film, the light output power of a white LED with a patterned YAG phosphor-incorporated film increased to up to 13% higher than that of a white LED with a non-patterned film.
AB - In this study, we fabricated high-brightness white light emitting diodes (LEDs) by developing a nanopatterned yttrium aluminum garnet (YAG) phosphor-incorporated film. White light can be obtained by mixing blue light from a GaN-based LED and yellow light of the YAG phosphor-incorporated film. If white light sources can be fabricated by exciting proper yellow phosphor using blue light, then these sources can be used instead of the conventional fluorescent lamps with a UV source, for backlighting of displays. In this work, a moth-eye structure was formed on the YAG phosphor-incorporated film by direct spin-on glass (SOG) printing. The moth-eye structures have been investigated to improve light transmittance in various optoelectronic devices, including photovoltaic solar cells, light emitting diodes, and displays, because of their anti-reflection property. Direct SOG printing, which is a simple, easy, and relatively inexpensive process, can be used to fabricate nanoscale structures. After direct SOG printing, the moth-eye structure with a diameter of 220 nm was formed uniformly on the YAG phosphor-incorporated film. As a result of moth-eye patterning on the YAG phosphor-incorporated film, the light output power of a white LED with a patterned YAG phosphor-incorporated film increased to up to 13% higher than that of a white LED with a non-patterned film.
KW - Direct printing
KW - Moth-eye structures
KW - Spin-on glass
KW - White light emitting diodes
KW - YAG phosphor incorporated film
UR - http://www.scopus.com/inward/record.url?scp=84912016250&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2014.03.065
DO - 10.1016/j.tsf.2014.03.065
M3 - Article
AN - SCOPUS:84912016250
SN - 0040-6090
VL - 570
SP - 326
EP - 329
JO - Thin Solid Films
JF - Thin Solid Films
IS - PB
ER -