Open AccessColor-conversion efficiency enhancement of quantum dots via selective area nano-rods light-emitting diodes
Author(s) -
Che Yu Liu,
Tzu Pei Chen,
Tsung Sheng Kao,
Jen-Wei Huang,
HaoChung Kuo,
YangFang Chen,
Chun Yen Chang
Publication year - 2016
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.24.019978
Subject(s) - light emitting diode , materials science , optoelectronics , electroluminescence , quantum dot , quantum efficiency , nanorod , diode , energy conversion efficiency , photoluminescence , color rendering index , photolithography , optics , nano , nanotechnology , physics , layer (electronics) , composite material
A large enhancement of color-conversion efficiency of colloidal quantum dots in light-emitting diodes (LEDs) with novel structures of nanorods embedded in microholes has been demonstrated. Via the integration of nano-imprint and photolithography technologies, nanorods structures can be fabricated at specific locations, generating functional nanostructured LEDs for high-efficiency performance. With the novel structured LED, the color-conversion efficiency of the existing quantum dots can be enhanced by up to 32.4%. The underlying mechanisms can be attributed to the enhanced light extraction and non-radiative energy transfer, characterized by conducting a series of electroluminescence and time-resolved photoluminescence measurements. This hybrid nanostructured device therefore exhibits a great potential for the application of multi-color lighting sources.