Variations in the short wavelength cut-off of the solar UV spectra

Abstract

SummaryCloud and solar zenith angle (SZA)

Oxidation events and skin aging

“…Considering that solar radiation of wavelengths < 290 nm do virtually not reach the earth, 290 nm represents a relevant wavelength limit for UV exposure on earth, whereas the distinction between UVB and UVA at 320 nm, (some authors refer to 315 nm) is an artificial subdivision (Parisi and Turner, 2006;van der Leun, 2004) (Fig. 3).…”

“…The radiation intensity (W/m 2 ) of both UVB and UVA depends on several factors, including the solar zenith angle, reflection by the soil (albedo) (Parisi and Turner, 2006), altitude and the presence of clouds or dust particles in the sky that filter or scatter the radiation (Diffey, 1998). The irradiation dose (J/m 2 ) is the product of the radiation intensity multiplied by the exposure time, and predominantly determines the UV-induced damage to the skin.…”

Reciprocity and spectral effects of the degradation of poly(ethylene‐terephthalate) under accelerated weathering exposures

“…Xenon-arc lamps are broad band sources that emit from the ultraviolet all the way up through the infrared, just like natural sunlight, and with second generation daylight filters, provide a near exact match to sunlight from the solar cut-on at 295 nm. 21 Over the course of time a wide variety of artificial sources have been used for conducting artificial weathering of photovoltaic materials, components, and systems. While some produce highly accelerated degradation, the degradation produced has not always been predictive of long-term natural weathering.…”

“…UVA‐340 lamps are a good match to sunlight up to 360 nm, after which the lamp irradiance drops off sharply. Xenon‐arc lamps are broad band sources that emit from the ultraviolet all the way up through the infrared, just like natural sunlight, and with second generation daylight filters, provide a near exact match to sunlight from the solar cut‐on at 295 nm . Over the course of time a wide variety of artificial sources have been used for conducting artificial weathering of photovoltaic materials, components, and systems.…”

Low-energy UV effects on Organic Thin-Film-Transistors

“…In fact, excluding peculiar cases (such as the accidental exposure to UV artificial lights such as UV LEDs and Wood/black light/tanning tubes etc), the most likely cause of near UV irradiation is the exposure to sunlight. Indeed, the sunlight spectrum has a remarkable near-UV component [26]- [27], which can be as high as several mW/cm 2 . Among the several devices, which could experience direct sunlight exposure, we may cite AMOLED and LCD TFT displays.…”