Hybrid UV LED Device for Simulating Spectrum of High-Pressure Mercury Lamp: Evaluation in UV Curing Process

Abstract

A hybrid ultra-violet light emitting diode (UV LED) comprising short and long wavelength UV LEDs (310, 340, and 365 nm) was developed and compared with the high-pressure mercury lamp for UV curing of a mixture of diurethane dimethacrylate, 1-hydroxycyclohexyl phenyl ketone, and diphenyl (2,4,6-trimethylbezoyl) phosphine oxide. The curing ability of the hybrid UV LED combinations was evaluated by comparing the thickness of the un-polymerized layer, calculated from the mass before and after rinsing the UV-cured film under air. The results indicated that among the combinations of UV LEDs, the combination of 365 nm and 310 nm UV LEDs provided the thinnest un-polymerized layer. This result was comparable to that obtained with the high-pressure mercury lamp. Nevertheless, the thickness of the un-polymerized layer achieved with the high-pressure mercury lamp was less than that with any of the UV LED combinations. The data show that the 405 nm line of the highpressure mercury lamp functions to photopolymerize the monomer and is indispensable for the UV curing process.

Design of a Safety Device Ultra Violet Light for Mercury Identification in Whitening Cream with Thin Layer Chromatography Method Using Camera OV7670 Based on Arduino Uno

“…Traditional ultra violet lamps emit less heat which can cause problems and are replaced UV light emitting diode (LED) more efficient [28]. Ultra violet light emitting diode (UV LED) comprising short and long wavelength UV 310nm, 340nm,and 365nm [ [29]. This research use light ultra violet LED 254 nm and 366nm.…”

Material jetting for advanced applications: A state-of-the-art review, gaps and future directions

“…As mentioned above, the wavelength determines the penetration depth of the incident light, that is why UV-curables are often optimized for a broader wavelength range. Adapting the formulation of an existing ink to a monochromatic UV-LED-lamps implies a change of final physical properties, which poses a challenge to the industry [197]. To cure a UV-curable ink that is optimized for treatment with a mercury UV-lamps, Taki and Sawa utilized a hybrid UV-LED, that is, a LED-lamp containing three different wavelengths, to achieve comparably curing results [197].…”

“…Adapting the formulation of an existing ink to a monochromatic UV-LED-lamps implies a change of final physical properties, which poses a challenge to the industry [197]. To cure a UV-curable ink that is optimized for treatment with a mercury UV-lamps, Taki and Sawa utilized a hybrid UV-LED, that is, a LED-lamp containing three different wavelengths, to achieve comparably curing results [197]. UV-LED also offers in terms of safety issue a good alternative to mercury arc lamps as mercury has long been identified as toxic and poses a risk to both workplace and environment [198].…”

New, highly versatile bimolecular photoinitiating systems for free-radical, cationic and thiol–ene photopolymerization processes under low light intensity UV and visible LEDs for 3D printing application

“…An additional aspect motivating research is demand in the market of machine park manufacturers for photochemical applications. 32 Particularly interesting here is the increase in the production of radiant heaters based on electroluminescent diodes, of type UV-LED or Vis-LED. 33 LED technology is increasingly present in daily life, as well as typical industrial applications.…”