Open AccessFabrication of highly stable silica coated ZnCuInS nanocrystals monolayer via layer by layer deposition for LED application
Author(s) -
Wonkeun Chung,
Hyung-Shik Jung,
Chang-Hun Lee,
Sung Hyun Kim
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.002483
Subject(s) - materials science , layer (electronics) , monolayer , fabrication , coating , phosphor , layer by layer , deposition (geology) , chemical vapor deposition , chemical engineering , nanotechnology , optoelectronics , medicine , paleontology , alternative medicine , pathology , sediment , engineering , biology
In this study, non-toxic and highly stable silica coated ZnCuInS NCs were synthesized by a reverse microemulsion method. The single NCs were uniformly encapsulated in a silica shell with a diameter of ~30 nm. Although hydrolyzed TEOS caused a QY reduction, and a 12.5 nm red shift occurred after silica coating, the photo and thermal stabilities were extremely improved. For LED application, the silica coated ZnCuInS NCs phosphor layer was arrayed on the InGaN LED surface by layer-by-layer deposition utilizing electrostatic attraction. When the ZnCuInS/SiO2 NCs single monolayer was fabricated, 6.73% high color conversion efficiency was achieved.