Investigation of photoluminescent effect in opal glasses used as diffuse reflectance standards

Photoluminescence from white reference materials for spectral diffuse reflectance measurements upon exposure to radiation shorter than 400 nm

“…UV-cut filters are usually applied in commercial instruments to eliminate the UV radiation that would cause the photoluminescence from samples. As most white reference materials are considered as not producing photoluminescence upon exposure to near-UV and visible radiation, almost no attention has been paid so far to such photoluminescence except for a few studies that referred to the existence of photoluminescence on a kind of opal glass [6] and ceramic tiles [7]. However, our research revealed that some kinds of white reference materials produced photoluminescence even on exposure to radiation in the short wavelength range of the visible region.…”

“…It also seems to show photoluminescence in the green region that is similar to the spectrum on the matte ceramic tile (1) described in section 4.2. Sample (1) shown in figure 4 is a kind of Japanese opal glass, which is the same type of sample in which strong photoluminescence due to UV radiation was reported in the past [6]. By contrast, sample (2) showed barely visible photoluminescence upon exposure to radiation down to 340 nm.…”

State-of-the Art Comparability of Corrected Emission Spectra.1. Spectral Correction with Physical Transfer Standards and Spectral Fluorescence Standards by Expert Laboratories

“…At NRC, measurements of the reflected and total spectral radiance factors of the fluorescent dye solutions were performed on the well-described NRC reference spectrofluorometer based on the two-monochromator method using a 45° annular illumination and normal viewing (45a:0) in accordance with the International Commission on Illumination (CIE) and ASTM International colorimetric standards. , To enhance the instrument’s sensitivity over its operation range (200–1040 nm) for the measurement of dye solutions, two different holographic gratings of 1200 grooves/mm, optimized over different wavelength regions (grating A, 200–700 nm; grating B, 450–1100 nm), were used. , …”

Comparison measurements of 0∶45 radiance factor and goniometrically determined diffuse reflectance

“…For these samples, fluorescence has been visibly observed when irradiated with intense short UV radiation at 254 nm from a mercury lamp. Also, earlier studies of photoluminescence of two different types of Russian Opal glass samples [16] support this argument. Both types of Russian Opal (MS-20 and MS-14) had an excitation maximum at 280 nm and an emission maximum at 370 nm [16].…”

“…Also, earlier studies of photoluminescence of two different types of Russian Opal glass samples [16] support this argument. Both types of Russian Opal (MS-20 and MS-14) had an excitation maximum at 280 nm and an emission maximum at 370 nm [16]. The maximum difference between the TKK and the PTB for sample RO1 is exactly at 280 nm as can be seen from Fig.…”