摘要
Lanthanide-doped upconversion nanoparticles(UCNPs)can absorb near-infrared photons and convert them into visible and ultraviolet emissions.These nanomaterials possess extraordinary optical performance and hold potential as active platforms for a variety of technological applications.The ability to fabricate highly ordered nanoparticle-based photonic elements over a large area is of fundamental significance for luminescence tuning.Despite all the efforts made,however,large-area spatial patterning of UCNPs into ordered arrays with high controllability remains a challenge.In this study,we report a highthroughput strategy to pattern optical nanomaterials through the use of polymer microspheres and templated assembly of UCNPs.This technique utilizes capillary force to drive hybrid clusters into the physical template,resulting in large-area,spatially ordered arrays of particles.The findings reported in this work may promote the development of novel nonlinear optical devices,such as solid-state laser arrays,high-density optical storage,and anti-counterfeiting labels.
基金
Project supported by the Singapore Ministry of Education(MOE2017-T2-2-110)
Agency for Science,Technology and Research(A*STAR)(A1883c0011)
National Research Foundation,Prime Minister’s Office,Singapore under its Competitive Research Program(NRF-CRP15-2015-03)
under the NRF Investigatorship Programme(NRF-NRFI05-2019-0003)
National Natural Science Foundation of China(21771135)。
