Polymer-encapsulated UV-curable stacked prismatic layers of all-halide phosphor composites for white luminescence

Abstract

Perovskite halide nanocrystals have been actively investigated for use in white-luminescence photonic devices. Herein, a remote phosphor-layered composite consisting of all-halide red and green nanocrystals embedded in an ultraviolet (UV)-cured matrix is proposed as a facile way to create competitive white luminescence. Alternating stacks of cast halide layers with controlled concentration and thickness yielded true white luminescence characteristics when the halide layers were combined with a bottom blue chip. Specifically, the adjusted prismatic pattern for the red halide layer was found to effectively strengthen the emission of white luminescence. In particular, a phosphor-stacked structure of green and red layers with a 9 -lm-pitch prismatic pattern resulted in an enhanced luminous efficacy of-54.4 lm W-1, which is higher than those of a non-prismatic layer or a larger pitch pattern. Encapsulating both sides of the halide layers with polydimethylsiloxane (PDMS) maintained very effec-tively the luminescence of the halide layers over the exposure of 300 h.(c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).