Issue 25, 2017

A colloidal quantum dot photonic crystal phosphor: nanostructural engineering of the phosphor for enhanced color conversion

Abstract

Phosphors, long-known color-converting photonic agents, are gaining increasing attention owing to the interest in white LEDs and related applications. Conventional material-based approaches to phosphors focus on obtaining the desired absorption/emission wavelengths and/or improving quantum efficiency. Here, we report a novel approach for enhancing the performance of phosphors: structural modification of phosphors. We incorporated inorganic colloidal quantum dots (CQDs) into a lateral one-dimensional (1D) photonic crystal (PhC) thin-film structure, with its photonic band-edge (PBE) modes matching the energy of ‘excitation photons’ (rather than ‘emitted photons’, as in most other PBE application devices). At resonance, we observed an approximately 4-fold enhancement of fluorescence over the reference bulk phosphor, which reflects an improved absorption of the excitation photons. This nano-structural engineering approach is a paradigm shift in the phosphor research area and may help to develop next-generation higher efficiency phosphors with novel characteristics.

Graphical abstract: A colloidal quantum dot photonic crystal phosphor: nanostructural engineering of the phosphor for enhanced color conversion

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2017
Accepted
21 May 2017
First published
23 May 2017

Nanoscale, 2017,9, 8703-8709

A colloidal quantum dot photonic crystal phosphor: nanostructural engineering of the phosphor for enhanced color conversion

K. Min, H. Jung, Y. Park, K. Cho, Y. Roh, S. W. Hwang and H. Jeon, Nanoscale, 2017, 9, 8703 DOI: 10.1039/C7NR01055A

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