A colloidal quantum dot photonic crystal phosphor: nanostructural engineering of the phosphor for enhanced color conversion. Issue 25 (15th June 2017)

• Record Type: Journal Article
• Authors: Min, Kyungtaek; Jung, Hyunho; Park, Yeonsang; Cho, Kyung-Sang; Roh, Young-Geun; Hwang, Sung Woo; Jeon, Heonsu
• Is Part Of: Nanoscale. Volume 9:Issue 25(2017)
• Page Start: 8703
• Page End: 8709
• Publication Date: 2017-06-15
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr01055a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A colloidal quantum dot based photonic crystal phosphor is proposed and demonstrated to enhance color conversion efficiency. 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.