Towards Visible LED Illumination: ZnO‐ZnS Nanocomposite Particles

Abstract

Nowadays photo semiconductors such as ZnO are one of the driving forces of humanity towards economically and ecological safe life. Such semiconductors are used in solar applications and for light emission but also multiple investigations using the material as photocatalysts (water‐splitting), or as photo initiators were published. The combination of the inorganic material with an organic matrix leads to possible interesting hybrid materials. One drawback for ZnO and other photo semiconductors is the short UV wavelength (in the UV−range) which is necessary to photoactivation. We will present the possibility of modified ZnS‐ZnO nanocomposites being reactive towards visible light for example 406 nm LED illumination. Therefore, the particles are used as initiators for free radical polymerization. The simply to handle experimental preparation procedure of the sulphur containing ≈10 nm particles is described in this work for the first time.

Novel Photoinitiators Based on Benzophenone‐Triphenylamine Hybrid Structure for LED Photopolymerization

“…Thereinto, PIS based on ZnO x S y nanoparticles which demonstrated high reactivity in free radical photopolymerization (FRP) under LEDs irradiation was presented. [ 10 ] Furthermore, a modified ZnO‐based PIS was known for nonmigration. The interesting discovery led to a novel system with significant initiation potential, without a coinitiator or fragmentation.…”

High-Performance Photoinitiating Systems for LED-Induced Photopolymerization

“…To match with LEDs, many PISs was designed and developed in the past decade, such as Type Ⅰ and Type Ⅱ PIs, dye-based PISs, metal-complex-based PISs, polyoxometalate-based PISs, and nanoparticle-based PISs, and so on [ 43 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. Herein, some highly interesting works for dye-based PISs and the modification of commercial Type Ⅰ PIs and Type Ⅱ PIs are presented.…”