Upconversion Nanocomposite Materials With Designed Thermal Response for Optoelectronic Devices
authors Martinez, ED; Brites, CDS; Carlos, LD; Urbano, RR; Rettori, C
nationality International
journal FRONTIERS IN CHEMISTRY
author keywords upconversion nanoparticles; polymer nanocomposites; luminescent coatings; optical thermometry electrochromic devices; thermochromism; optoelectronic devices; thermoplasmonics
keywords SILVER-NANOWIRE NETWORKS; NANOPARTICLES; LUMINESCENCE; EMISSION; NANOCRYSTALS; HEATERS; IONS
abstract Upconversion is a non-linear optical phenomenon by which low energy photons stimulate the emission of higher energy ones. Applications of upconversion materials are wide and cover diverse areas such as bio-imaging, solar cells, optical thermometry, displays, and anti-counterfeiting technologies, among others. When these materials are synthesized in the form of nanoparticles, the effect of temperature on the optical emissions depends critically on their size, creating new opportunities for innovation. However, it remains a challenge to achieve upconversion materials that can be easily processed for their direct application or for the manufacture of optoelectronic devices. In this work, we developed nanocomposite materials based on upconversion nanoparticles (UCNPs) dispersed in a polymer matrix of either polylactic acid or poly(methyl methacrylate). These materials can be processed from solution to form thin film multilayers, which can be patterned by applying soft-lithography techniques to produce the desired features in the micro-scale, and luminescent tracks when used as nanocomposite inks. The high homogeneity of the films, the uniform distribution of the UCNPs and the easygoing deposition process are the distinctive features of such an approach. Furthermore, the size-dependent thermal properties of UCNPs can be exploited by a proper formulation of the nanocomposites in order to develop materials with high thermal sensitivity and a thermochromic response. Here, we thus present different strategies for designing optical devices through patterning techniques, ink dispensing and multilayer stacking. By applying upconverting nanocomposites with unique thermal responses, local heating effects in designed nanostructures were observed.
publisher FRONTIERS MEDIA SA
issn 2296-2646
year published 2019
volume 7
digital object identifier (doi) 10.3389/fchem.2019.00083
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000460329200001
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  impact metrics
journal analysis (jcr 2017):
journal impact factor 4.155
5 year journal impact factor 4.749
category normalized journal impact factor percentile 74.561
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