Nanopatterned yttrium aluminum garnet phosphor incorporated film for high-brightness GaN-based white light emitting diodes

Joong Yeon Cho, Sang Jun Park, Jinho Ahn, Heon Lee

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)326-329
Number of pages4
JournalThin Solid Films
Volume570
Issue numberPB
DOIs
StatePublished - 2014 Nov 3

Fingerprint

Garnets
Yttrium
Phosphors
yttrium-aluminum garnet
phosphors
Light emitting diodes
Luminance
moths
brightness
light emitting diodes
Aluminum
printing
Printing
Glass
Light sources
glass
Display devices
Fluorescent lamps
optoelectronic devices
yttrium-aluminum-garnet

Keywords

  • Direct printing
  • Moth-eye structures
  • Spin-on glass
  • White light emitting diodes
  • YAG phosphor incorporated film

Cite this

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abstract = "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.",
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Nanopatterned yttrium aluminum garnet phosphor incorporated film for high-brightness GaN-based white light emitting diodes. / Cho, Joong Yeon; Park, Sang Jun; Ahn, Jinho; Lee, Heon.

In: Thin Solid Films, Vol. 570, No. PB, 03.11.2014, p. 326-329.

Research output: Contribution to journalArticle

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