As a fluorescent color name applicable to the field of food, it was synthesized from 5-carboxy-2- (4-hydroxyphenyl)-2H-benzotriazole corresponding to the benzotriazole-based blue fluorescent dye.This fluorescence was contained in polycarbonate, and a bluish-purple fluorescent film was produced by an extrusion molding machine.As for its world light characteristics, the fluorescent main wave bismuth showed an emission efficiency of 410 nm and a fluorescence quantum yield of 74%, and also showed excellent light resistance.It was shown by the measurement of the spectroscopic synchrotron radiation meter that this normal light film can convert UV light into synchrotron radiation with human sunlight.It was found that the use of this ever-purple fluorescent film for tomato cultivation significantly increased the lycopene content of tomato fruits.This increase in lycopene content was also clarified by color measurement of the pericarp metaphor, and it was found that the color change a value increased by 2 to 6 compared to the ripe tomatoes in the control group (without film).

01 Apr 2007·Solid State Communications

The optical excitation mechanism in ZnS: Sm3+ grown by molecular-beam epitaxy

Author: Akimoto, Katsuhiro ; Yamada, Hisashi ; Kurita, Atusi ; Tanaka, Masanori

The authors fabricated a thin film of Sm³⁺ doped ZnS by MBE and studied its photoluminescence properties.The excitation spectrum of the Sm³⁺ luminescence at 10 K is dominated by broad bands peaked at the free exciton energies, in contrast to many earlier reports on rare-earth-doped semiconductors.The free exciton contributes significantly to the excitation of Sm³⁺ in the authors' MBE sample, probably because the concentration of the trap centers which capture free excitons but do not transfer energy to Sm³⁺ is sufficiently low in the authors' sample.The thermal quenching characteristic of the Sm³⁺ luminescence under interband excitation of the ZnS host is fitted well to a formula expressed by taking into account two deactivation channels.The origins of these deactivation channels are argued from previously proposed excitation mechanisms of the rare-earth ions in semiconductors.

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