• Fire Science and Engineering
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• v.19 no.4 s.60
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• pp.42-46
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• 2005

This study is intended to examine the degree of phosphorescent luminance in proportion to the amount of phosphorescent pigments in the ceramic based coating. The results of this study were that the degree of phosphorescent luminance was Increased in proportion to the amount of phosphorescent pigments in the ceramic based coatings. Samples with more than $20\%$ of phosphorescent pigments exceeded the Japanese Industrial Standard for security signs. Luminance levels 10 times greater than the KS and JIS standard were obtained with a concentration of $50\%$. The luminance increased initially with the number of applications of the ceramic based coating but there was no further increase for more than 4 applications. The water-based phosphorescent ceramics developed here are made entirely of inorganic materials and do not generate toxic gases. The optical characteristics of these materials makes them suitable for use in phosphorescent emergency exit signs in place of the traditionally used vinyl chloride materials.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.33 no.1
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• pp.31-36
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• 2023

The number of people living with a pets is increasing. The size of related industries are expanding. There is an increasing demand for various designs, functions, and materials for pet accessories. Therefore, this study proposes the development of a pet jewelry design using a phosphorescent pigment. The phosphorescent pigments have an advantage of emitting light by themselves even in dark places. The final design was derived by manufacturing this as a gemstone cutting-type resin and applying it to the development of jewelry design for pets.

• Journal of the Korean institute of surface engineering
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• v.56 no.2
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• pp.152-159
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• 2023

The night visibility of pavement is being considered as a global issue in the field of traffic safety. Although the spreading glass beads on the lane paints has been mainly used to secure night-visibility by utilizing the effect of retroreflection, obvious shortcoming of this method is that retroflection does not occur in the range where the headlights do not reach the glass beads. The use of functional paints including phosphorescent constituents could be a solution for overcoming fore-mentioned problem. SrAl₂O₄ based chemicals have not only good phosphorescent property, but also are chemically stable compared to existing ZnS based materials. However, this chemicals also need the improvement due to slightly reduced luminous effect in time. Herein, we developed novel paints showing enhanced phosphorescent properties by putting rare earth elements such as Eu, Dy and Y into SrAl₂O₄. These prepared phosphorescent pigments have displayed improved properties in terms of durability and long afterglow. For instance, the property of afterglow has been persisted after 5 hours with luminace of 20.6 mcd/m².

• Fisheries and Aquatic Sciences
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• v.17 no.2
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• pp.223-227
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• 2014

The present study examined whether light emitted by long-afterglow phosphorescent pigments (LumiNova) would stimulate gonadal development in fish during the nonbreeding season. Pellets containing LumiNova powder (treatment group) were prepared and placed on the calvaria of specimens of the sapphire devil Chrysiptera cyanea, a reef-associated damselfish that requires long days for gonadal recrudescence. A pellet without LumiNova powder was placed on the calvaria of the control fish (control group). Fish were reared at $26^{\circ}C$ under a light-dark cycle (12 h photophase, 12 h scotophase; LD 12:12) for 4 weeks. No difference in the gonadosomatic index (GSI) or ovarian histology was observed among the control, sham-operation, and treatment groups 1 week after the start of the experiment. After 4 weeks, the GSI of the control and sham-operation groups remained at low levels, and ovaries contained immature oocytes at the perinucleolus stage. In contrast, the treatment group exhibited significantly higher values of GSI as well as developed ovaries with fully vitellogenic oocytes. These results demonstrated that long-day conditions were produced by light emitted from the LumiNova pellets, thus stimulating ovarian development in the damselfish. Therefore, long-afterglow phosphorescent pigments can be used as an alternative to standard light sources for purposes of artificial stimulation of gonadal development in fish.