New hydrogen donors for amine-free photoinitiating systems in dental materials

Sprick, Elodie; Becht, Jean‐Michel; Graff, Bernadette; Salomon, Jean-Pierre; Tigges, Thomas; Weber, Christoph A.; Lalevée, Jacques

doi:10.1016/j.dental.2020.12.013

Cited by 13 publications

(3 citation statements)

References 20 publications

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“…Indeed, Type II photoinitiators are extremely popular in photopolymerization and we wanted to anticipate future works of photopolymerists aiming at addressing the extractability issue. [32,[62][63][64][65][66][67][68][69][70][71][72]] EA1-EA15 have been selected as electron acceptors as these structures strongly differ by their electron-withdrawing ability.…”

Section: Introductionmentioning

confidence: 99%

Push-pull dyes based on Michler's aldehyde: Design and characterization of the optical and electrochemical properties

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Push-pull dyes based on Michler's aldehyde: Design and characterization of the optical and electrochemical properties

et al. 2022

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“…We believe that the UV-blocking OCA prepared here will have enormous practical applications beyond the foldable OLEDs, providing protection against UV radiation for diverse smart devices with various form factors. Furthermore, the newly developed PIS is believed to be used as a key PIS not only for the preparation of (functional) OCA film, but also visible-light-based 3D/4D printing [81][82][83][84][85] , optically clear resins 33 , soft actuator/robotics 86,87 , dental resin 88,89 , and more 90 .…”

Section: Discussionmentioning

confidence: 99%

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Kwon,

Lee,

Kim

et al. 2024

Nat Commun

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In developing an organic light-emitting diode (OLED) panel for a foldable smartphone (specifically, a color filter on encapsulation) aimed at reducing power consumption, the use of a new optically clear adhesive (OCA) that blocks UV light was crucial. However, the incorporation of a UV-blocking agent within the OCA presented a challenge, as it restricted the traditional UV-curing methods commonly used in the manufacturing process. Although a visible-light curing technique for producing UV-blocking OCA was proposed, its slow curing speed posed a barrier to commercialization. Our study introduces a highly efficient photo-initiating system (PIS) for the rapid production of UV-blocking OCAs utilizing visible light. We have carefully selected the photocatalyst (PC) to minimize electron and energy transfer to UV-blocking agents and have chosen co-initiators that allow for faster electron transfer and more rapid PC regeneration compared to previously established amine-based co-initiators. This advancement enabled a tenfold increase in the production speed of UV-blocking OCAs, while maintaining their essential protective, transparent, and flexible properties. When applied to OLED devices, this OCA demonstrated UV protection, suggesting its potential for broader application in the safeguarding of various smart devices.

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“…We believe that the UV-blocking OCA prepared here will have enormous practical applications beyond the foldable OLEDs, providing protection against UV radiation for diverse smart devices with various form factors. Furthermore, the newly developed PIS is believed to be used as a key PIS not only for the preparation of (functional) OCA lm, but also visible-light-based 3D/4D printing, [66][67][68][69][70] optically clear resins, 29 soft actuator/robotics, 71,72 dental resin, 73,74 and more. 75…”

Section: Discussionmentioning

confidence: 99%

Ultraviolet Light Blocking Optically Clear Adhesives for Foldable Displays via Highly Efficient Visible-Light Curing

Kwon,

Kim,

Lee

2023

Preprint

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The design of a new foldable smartphone's organic light-emitting diode (OLED) panel, developed to reduce power consumption, necessitates the utilization of an advanced optically clear adhesive (OCA) capable of blocking UV light, in addition to its conventional functions of adhesion and strain relief. However, a challenge arises due to the presence of a UV blocking agent within the OCA. This presents a technical limitation, preventing the application of UV curing technology widely utilized in the OCA manufacturing process. Recently, a method for producing UV-blocking OCA through visible-light curing has been proposed, utilizing a new photo-initiating system (PIS). Nevertheless, the curing speed remains significantly slow, which hinders its commercialization. In this study, we have developed a highly efficient photo-initiating system (PIS) that enables the rapid production of UV-blocking OCAs suitable for commercialization under visible-light irradiation. Through a mechanistic analysis of existing PIS, we suggested that the photocatalysts (PCs) in the excited state dissipates upon the occurrence of the triplet-triplet energy transfer (EnT) or energy transfer (ET) with UV blocking agents, thereby impeding the curing rate. To address this, we employed a newly designed PC to reduce both EnT and ET rates when combined with UV absorbers, in comparison to a previously reported PC. Combining the PC with carefully chosen co-initiators, we created a new PIS that generates radicals rapidly through electron transfer. Under 452 nm visible light, we achieved UV-blocking OCAs at a rate approximately 10 times faster than before, while maintaining excellent UV-blocking ability, optical transparency, and viscoelastic properties. In UV-blocking tests, covered OLED device covered with the UV-blocking OCA demonstrated superior UV-blocking performance, indicating broad applications in protecting diverse smart devices with various form factors from UV irradiation.

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New hydrogen donors for amine-free photoinitiating systems in dental materials

Cited by 13 publications

References 20 publications

Push-pull dyes based on Michler's aldehyde: Design and characterization of the optical and electrochemical properties

Push-pull dyes based on Michler's aldehyde: Design and characterization of the optical and electrochemical properties

Ultraviolet light blocking optically clear adhesives for foldable displays via highly efficient visible-light curing

Ultraviolet Light Blocking Optically Clear Adhesives for Foldable Displays via Highly Efficient Visible-Light Curing

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