Ultraviolet Light Blocking Optically Clear Adhesives for Foldable Displays via Highly Efficient Visible-Light Curing
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The design of a new foldable smartphone's OLED panel requires an advanced optically transparent adhesive (OCA) that can block UV light, beyond adhesion and strain relief. Producing UV-blocking OCAs through visible light photocuring has been suggested, but decreased curing rates with UV-blocking agents hinder commercialization. This study developed a highly efficient photo-initiating system (PIS) that rapidly produces UV-blocking OCAs under visible light. Existing PISs showed triplet-triplet energy transfer hinders curing rate. A new photocatalyst (PC) with a lower energy transfer rate to UV absorbers was used. Combining this PC with co-initiators created a new PIS that generates radicals rapidly via electron transfer. Under 455 nm visible light, UV-blocking OCAs were achieved about 10 times faster, maintaining excellent UV blocking and optical transparency. Tests showed OCA-coated OLED panels had superior UV-blocking performance, indicating broad applications in protecting various smart devices from UV irradiation.